Table of Contents
| Section | Title | Page |
| Purpose | 2 | |
| Scope | 2 | |
| Related Documents | 2 | |
| Responsibilities | 3 | |
| Reports | 3 | |
| Equipment Unloading | 4 | |
| Job Review Meeting | 4 | |
| Inspection and Preservation | 5 | |
| Foundation Requirements | 5 | |
| Compressor and/or Base Frame Installation and Erection | 6 | |
| Compressor and Motor Commissioning | 14 | |
| Compressor Start-up and Test Runs | 18 | |
| Acceptance | 22 | |
| Change Log | 22 | |
| Expansion Joint Detail Using the Secondary Seal Design | 12 | |
| Anchor Bolt and Leveling Screw Assembly | 12 | |
| Course Pitch Metric Thread-M Profile Anchor Bolt Torques 206.9 MPa (30,000 psi) Internal Bolt Stress |
10 | |
| Unified National Course (UNC) Screw Thread Anchor Bolt Torques 206.9 MPa (30,000 psi) Internal Bolt Stress |
11 |
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1. PURPOSE
1.1 This specification is not intended to supersede a manufacturer’s installation, erection, commissioning, and start-up procedure when the manufacturer is contracted to install and commission their equipment. However it may be used as a guide to ascertain the completeness of any manufacturer’s procedure. Depending on project execution strategy, this specification may be used to define the minimum requirements for the design and installation of the foundation for an integrally geared centrifugal compressor for process, flammable, and/or toxic gas compression. Section 9, Foundation Requirements, of this specification is intended to be used by the project civil engineer as a guide to design the foundation. It is also intended that Section 9 of this specification may be used as part of the civil construction package. Additionally, this specification may be used to define the minimum requirements for the installation, erection, commissioning, and start-up of such an integrally geared centrifugal compressor. This specification may be used as part of the mechanical construction package for the compressor.
2. SCOPE
2.1 This specification applies to integrally geared centrifugal compressors in process, flammable, and/or toxic gas compression service.
2.2 This specification also outlines the scope of work split for carrying out those tasks in a guideline form and serves as a work checklist for those tasks.
2.3 Scope of Work
2.3.1 The installation includes the foundation installation and preparation, equipment unloading, job review, preservation, setting, compressor systems assembly, level and anchor, preliminary alignment and grouting, installation, and connecting of all equipment associated with the compressor. For large compressors, the installation shall also include compressor assembly of the interstage piping and coolers. Also included is the setting and alignment of the motor to compressor or compressor base frame assembly.
2.3.2 The compressor erection includes installing the compressor and/or compressor base frame assembly, lube oil console and its associated piping, seal gas control panel as well as small bore piping runs. The compressor erection also includes installing any components of the base frame assembly removed for shipping.
2.3.3 System commissioning includes piping blowout, instrument and recycle system checkout, seal system checkout, lube oil system flush, cooling water system flush, motor checkout and uncoupled run, final alignment and couple up.
2.3.4 Compressor start-up includes compressor run-in and post-run inspection.
3. RELATED DOCUMENTS
3.1 Company Engineering Documents (Worldwide Facilities) 4CS02001A Anchor Bolt Design and Selection 4WCE-600500 Crane and Lifting Procedures
3.2 Companys Engineering Documents (European Facilities or European Engineered Facilities Worldwide Only) M10 Concrete and Reinforcement 4ECE-M13 Grouting of Equipment and Structures
3.3 Companys Engineering Documents (U.S. Facilities or U.S. Engineered Facilities Worldwide Only) 4ACS-640102 Concrete Work 4ACS-640106 Grouting of Equipment and Structural Steel
4. RESPONSIBILITIES
Note: The Companys machinery representative referenced in this document will either be the machinery engineer or the Global Operations (GO) mechanical technician or supplier representative.
4.1 The Companys representative, usually the Construction Superintendent, has overall responsibility for the construction contract and will implement these procedures and the proper installation of the machine. The Companys representative will coordinate the construction contractor’s effort, and ultimately be responsible to accept the machine from the construction contractor, hereafter referred to as “the contractor.”
4.2 The Companys representative might delegate technical area authority to the following people (Companys machinery representative) as required: Companys machinery engineer Companys Global Operations mechanical technician Companys Global Operations mechanical engineer Supplier representative Depending on project execution strategy, the Companys machinery representative may be any one of the above individuals at different times during the project.
4.3 The Companys machinery representative will be present on-site for a job review, before the beginning of the contractor’s installation work.
4.4 The Companys machinery representative and/or supplier representative will assist the Companys representative in technical areas such as installation, inspection, and certain running clearance checks, as required.
4.5 The contractor shall perform all work in accordance with the contract and this specification unless specifically noted otherwise herein. This includes material, labor, and labor supervision.
4.6 The Companys machinery representative will ensure that each of the tasks in this procedure has been properly completed. Each task shall be completed one time, unless otherwise required to be repeated for technical reasons. Items in the procedure followed by a “(W)” shall be witnessed by an Companys machinery representative.
4.7 The Companys machinery engineer has the responsibility to prepare data sheets to record erection and start-up data. These will be supplied to the Companys Global Operations mechanical technician or supplier representative before equipment arriving on site.
5. REPORTS
5.1 The Companys machinery representative will maintain the following logs and reports:
5.1.1 Daily log showing machinery work activity.
5.1.2 Data log on clearances and alignment according to erection procedure.
5.1.3 Weekly report on the status of the machinery erection and commissioning.
5.2 Before leaving the site, the Companys machinery representative or supplier representative will ensure that the requirement in paragraph 5.1.2 is complete. The Companys machinery representative will ensure that copies of items in paragraphs 5.1.2 and 5.1.3 are distributed to the Companys Project Engineering, Machinery Engineering, Construction Engineering, and Global Operations Departments. A copy of the item in paragraph 5.1.2 shall also be provided to the Plant Manager.
6. EQUIPMENT UNLOADING
6.1 All equipment lifts shall be according to 4WCE-600500. Before off-loading of any equipment, all lifts shall be approved by the Companys representative. After the equipment has been received and off-loaded on site by the contractor, the Companys representative will notify the Companys machinery representative. The equipment to be unloaded shall consist of the compressor frame, and/or compressor base frame assembly, and lube oil console. There may also be intercoolers and aftercoolers with their associated supporting framework and miscellaneous shipment of interstage piping. The equipment to be off-loaded shall also include any components required to be removed from the compressor base frame assembly to meet shipping constraints.
6.1.1 The Companys representative will verify the proper size crane, cables, eyebolts, and spreader are available and used.
6.1.2 The contractor shall rig cables so as to brace against the gearbox. Wood chocks shall be used as necessary.
Note: Do not use the gearbox cover eyebolts for lift rigging.
6.2 It is intended that the compressor and/or compressor base frame assembly be lifted directly from the truck (or railcar) onto its foundation. If the foundation is not ready, the package can be set on 100 mm x 100 mm (4 in x 4 in) cribbing on a level plot.
6.3 The Companys machinery representative will verify that the grout area of the foundation has been roughened by chipping to the aggregate before setting the machine. (W)
6.4 The contractor shall lift and set the machine.
6.5 The Companys machinery representative will inspect the package for damage and missing parts.
6.6 The Companys machinery representative will inform the Project Engineering and Machinery Engineering department representatives of any variances in the required machinery inventory, so in-house action can be initiated to resolve shortages in the shortest time possible to avoid delays later in the construction phase.
7. JOB REVIEW MEETING
7.1 Just before equipment arriving on site, the Companys machinery representative will call and chair a meeting with the appropriate Companys personnel from Construction Engineering, Project Engineering, Machinery Engineering, and Global Operations Department. The contractor and epoxy grout representative (if applicable) shall also be included in this meeting. This procedure shall be reviewed in detail. Any equipment lifts shall be reviewed and tentatively approved at this time. Proper anchor bolt placement and machine centerline locations shall be certified by the contractor at this time. Proper foundation preparation for epoxy grouting shall be certified by the epoxy grout representative. Proper sealing of the foundation to grade level shall be confirmed by the contractor at this time.
8. INSPECTION AND PRESERVATION
8.1 The Companys machinery representative will ensure that the compressor assembly is still sealed up and internally protected from the effects of corrosion due to rain, humidity, or dirt.
8.2 The Companys machinery representative will supervise removal of one process piping protective cover and one gearbox inspection cover by the contractor and thoroughly examine the visible interior surfaces for rust or contamination.
8.3 The Companys machinery representative will inspect the compressor assembly to verify that all connections, both plugged and flanged, are sealed airtight to prevent the escape of preservative vapors. If vapor pressure inhibitor (VPI) capsules are not used for preservation of the compressor base frame assembly, the contractor shall maintain (within eight hours after arriving on site and/or setting on the foundation) a nitrogen blanket on the compressor gear box, process gas system, motor bearings, and lube oil system components until commissioning and start-up. The nitrogen blanket shall be checked daily and recorded in a log by the contractor. During installation and erection, the nitrogen blanket shall be re-established at the end of each day’s work shift.
8.4 The coupling hubs shall be wrapped with a grease cloth, covered with polyethylene plastic sheet, and sealed with duct tape.
8.5 Main Drive Motor and Electrical boxes
8.5.1 The contractor shall run temporary power wiring and energize motor space heaters within 8 hours of the motor arriving on site, verify that all motor conduit box covers are sealed, and rotor shaft apertures are covered and sealed. The contractor shall install a termination box on the temporary power circuit with indication light adjacent to each motor space heater so that power to the circuit can be easily confirmed. The Companys machinery representative shall check the heaters on a weekly basis and record their status in the site log book.
8.5.2 The contractor shall ensure that the drive motor throat is covered and sealed, and all electrical boxes are maintained closed except during the wiring and calibration procedures.
8.5.3 The contractor shall cover the motor to protect it from any moisture.
9. FOUNDATION REQUIREMENTS
9.1 Foundation Design
9.1.1 When applicable, the compressor base frame foundation pad shall rise 50 to 100 mm (2 to 4 in) above the finished grade level or finished paving surface. It shall be designed and installed according to 4CS02001A, M10, and 4ACS-640102 as applicable. For facilities within Europe or European-engineered facilities worldwide, the closest SI or DIN equivalent to that specified in 4CS02001A may be used. The foundation pad shall extend beyond the base frame structural steel support members adequately to meet the minimum anchor bolt free edge distance requirements outlined in 4CS02001A. The foundation shall be designed to allow for a 25 mm (1 in) grout depth. Actual grout depths in the field shall not exceed 37.5 mm (1 1/2 in).
9.2 Anchor Bolts and Sleeves
9.2.1 Unless provided by the compressor manufacturer or otherwise specified on the foundation drawings, the compressor and/or compressor base frame anchor bolts shall be Unisorb Jakebolt heavy duty anchor bolts with 620,000 kPa (90,000 psi) tensile strength or Companys approved equal. The anchor bolts shall have a 150 mm (6 in) vertical adjustment. Note that the entire internal anchor assembly can be adjusted laterally as well as vertically. After installation, the top of the anchor bolt shall be adjusted vertically allowing two to four full threads exposure after torquing. On spot faced anchor bolt locations, a 6 mm (1/4 in) thick hardened washer shall be installed under the anchor bolt nut. A hardened spherical contact washer shall be installed under the anchor bolt nut for unfinished structural steel members. The minimum top tube length shall be as specified by the compressor supplier or as shown in Figure 2 of 4CS02001A. The top tube length shall be the sum of dimensions “E” and “F” for Type “3S” anchor bolts. The top tube length is defined as the distance from the top of the tube (top of the foundation) to the top of the steel housing containing the internal anchor assembly.
9.2.2 Minimum free edge distance from the centerline of the anchor bolts to the edge of the foundation shall be as listed in 4CS02001A. In no case shall the distance from the edge of the steel housing (containing the internal anchor assembly) to the edge of the foundation be less than 100 mm (4 in).
9.2.3 Anchor bolt holes on compressor base frame shall have a 3 mm (1/8 in) annular clearance for bolts below 37.5 mm (1 1/2 in) diameter. Bolts 37.5 mm (1 1/2 in) diameter and above shall have a 6 mm (1/4 in) annular clearance.
9.3 Foundation Installation
9.3.1 Anchor bolt sleeves shall be covered or filled with a non-bonding-moldable foam to prevent entry of concrete.
9.3.2 Anchor bolts for the compressor and/or base frame shall be accurately located with the use of a wooden or steel template. The anchor bolts shall be suspended from the template. Care shall be taken to ensure they project above the foundation level as specified on the foundation drawing. The bottom of the anchor bolts shall be securely tied to reinforcement bars running on top of the box section. This is to ensure the anchor bolts remain plumb and in the proper position throughout the pouring of the concrete. These reinforcement bars shall run parallel to both sides of the foundation, forming a cross at the bottom of each anchor bolt. The reinforcement bars shall be a minimum #6 (or DIN equivalent) size. The reinforcement bars shall then be tied to the reinforcement bars that form the exterior cage of the foundation. (W)
9.3.3 Materials, mixing, handling, and placement of mass concrete shall be according to M10 or 4ACS‑640102 as applicable. Adequate procedures shall be given to the control of the concrete temperature at the point of depositing.
9.3.4 Stainless steel plug bench marks shall be embedded in the foundation at each of the four corners. Their elevation shall be accurately recorded for future reference for settling or shifting of the foundation.
10. COMPRESSOR AND/OR BASE FRAME INSTALLATION AND ERECTION
10.1 Foundation Preparation Before Compressor and/or Base Frame Installation
10.1.1 Allow concrete foundation to cure for a minimum of 28 days before sealing or grouting.
10.1.2 The foundation table top and/or pedestals and supporting surfaces shall be smooth and free of any hard concrete, sludge, oil, or grease.
10.1.3 Seal the entire foundation that is above finished grade. Use clear ITW Philadelphia Resins IMPAX Water Based Epoxy Primer/Sealer followed by a topcoat of clear ITW Philadelphia Resins IMPAX HPU High Performance Urethane or Companys approved equal. For horizontal surfaces that will extend more than 150 mm (6 in) beyond the compressor base frame edges, the top coat of clear ITW Philadelphia Resins HPU High Performance Urethane shall have the optional anti-slip additive mixed in just prior to application.
10.1.4 The contractor shall accurately mark the compressor and/or base frame centerlines on the foundation. Before setting the compressor and/or base frame, the contractor shall check the foundation for dimensional accuracy. The contractor shall measure the anchoring hole locations and verify all anchor bolts are free in their sleeves. The contractor shall check the length and arrangement of the anchor bolts. (W)
10.1.5 All concrete areas in contact with grout must be chipped to expose aggregate to ensure grout adhesion. Chipping guns shall be used, not jack hammers. Chipping shall stop 10 to 15 mm (1/2 in to 3/4 in) short of the grout forms or final grout line. Blow all dust from prepared concrete. Air for blowing dust must be oil-free. An oil separator/filter must be used on the air supply. Protect concrete from dirt and oil before grouting. For epoxy grout, in addition, protect concrete from moisture.
10.1.6 For epoxy grout, after the concrete is prepped and before the compressor and/or the base frame is placed, cut and glue 1-inch wide Styrofoam expansion joints to concrete using clear silicone caulk, or a mixture of sand and ITW Philadelphia Resins Expansion Joint Compound when more support is required. Ensure drain channels through grout are in place. Place expansion joints on 1 to 1.25 m (3 to 4 ft) centers. Refer to Figure 1 for expansion joint details. (W)
10.1.7 Isolate at least the top 12 anchor bolt diameters with foam pipe insulation or moldable foam to protect bolts from grout adhesion and provide free length stretch of the bolt during torquing. (W)
10.2 Setting Compressor and/or Base Frame on the Foundation
10.2.1 All rigging and lifts shall be according to 4WCE-600500. The Companys representative will ensure that the proper rigging is available for lifting of compressor and/or base frame and associated parts by the contractor. This includes ensuring that the contractor will provide the proper size crane and proper size rigging hardware (e.g., slings, shackles, eyebolts, and spreader, if required). The Companys representative will inspect and approve the rig before any lift by the contractor. (W)
10.2.2 Surfaces on the compressor and/or base frame in contact with grout shall be coated with a compatible epoxy primer, Carboline Carbozinc 11 inorganic zinc primer or ITW Philadelphia Resins Rust Inhibitive Primer. Factory paint on the compressor in contact with the grout must be tight and free of all dirt, oils, and grease. Wipe grout contact areas down with clean rags and ITW Philadelphia Resins IMPAX IXT-59 Solvent to ensure cleanliness. All corners on the machinery to be grouted shall be rounded. All sharp edges shall be broken by the installing contractor. Touch up any damaged primer. The equipment supplier shall ensure that the outside corners of base frames and/or sole plates have a 2-inch radius to avoid stress concentration and resultant cracking in the grout. All compressor mounting feet, base frames, and/or sole plates shall have jack bolts to level the unit before grouting. Jack bolts shall be provided by the equipment supplier. Jack pads under the jack bolts shall be provided by the installing contractor. (W)
10.2.3 Apply Non-Melt grease or duct tape to all jack bolts in contact with grout. Use round bar as jacking pads. Refer to Figure 2 for details. (W)
10.2.4 The contractor shall lift and set the compressor and/or base frame on its foundation, sliding the frame onto the anchor bolts, and allowing it to rest on the jacking bolts. The contractor shall provide minimum 3 inch diameter x 1/2 inch thick carbon steel plates cut from bar stock for the jack bolts to bear against.
10.2.5 Remove any temporary supports. The contractor shall install any components removed for shipment. This includes items like oversize pressure vessels and heat exchangers, drive motor and/or motor top hat, motor junction boxes, couplings, and guards.
10.2.6 The contractor shall level the compressor/sole plates/base frame within a maximum of 0.25 mm/m (0.003 in/ft) variation using the jacking bolts along both sides of the sole plates or base frame. A machinist’s level or laser transit shall be used to check for levelness. The machined surfaces shall be clean and free of paint and rust prior to measurement.
10.2.7 At this point anchor bolts should be snugged up. The contractor shall torque the anchor bolts to a nominal 135–270 Nm (100–200 ft-lbs) to ensure that the compressor/sole plates/base frame is completely down on the jacking bolts. Care shall be taken not to over torque the bolts at this point, or distortion might occur.
10.2.8 The contractor shall verify that the compressor/sole plates/base frame is level in both directions (parallel to and perpendicular to the compressor drive shaft) and record the final level readings. When the motor is shipped on the base frame assembly, the coupling alignment shall be checked according to the manufacturer’s installation manual to ensure the frame is not distorted. The contractor is also responsible for setting the compressor at the correct elevation. (W)
10.3 Compressor Assembly
10.3.1 If not part of a base frame assembly, set the fabricated steel supports along cooler areas.
10.3.2 The cooler and interstage piping shall be installed. Supplier furnished supports for both the coolers and interstage piping shall be used. When making the interstage piping connections scroll deflections shall be checked by use of a dial indicator. Unless otherwise specified by the manufacturer, maximum deflection at the top and side of the scroll shall be 0.05 mm (0.002 in). (W)
10.3.3 Remove external rotor locks on the coupling. Remove any gear mesh protective sheet material that was necessary for shipment.
10.4 Motor Installation
10.4.1 If the motor is not part of the base frame assembly, chip and thoroughly clean the foundation area under the motor soleplate and clean the underside of the motor soleplate to remove all oil, dirt, loose rust, or loose paint.
10.4.2 Clean anchor bolts and anchor bolt holes and check that they are dry. Provide caulking, foam packing, plugs, and similar material to protect the anchor bolts and the anchor bolt holes from the grout.
10.4.3 Shims may be used under the motor base in locations where there is a long span between jackscrews. The need for shims shall be determined by using a precision level on the various machined pads to check for variations in level along the length of the baseplate.
10.4.4 These shims, if used, shall be removed after grouting.
10.4.5 Lift and set the motor in position on the foundation.
10.4.6 The rigging shall be approved by the Companys representative. (W)
10.4.7 Ensure anchor bolt holes have adequate clearance for alignment.
10.4.8 Perform initial motor internal checks to allow rotation of the rotor for the alignment.
10.4.9 Remove any rotor blocks.
10.4.10 Inspect bearings, shaft, and oil rings.
10.4.11 Fill motor bearings with oil.
10.4.12 See that the rotor turns freely.
10.5 Preliminary Alignment
10.5.1 Alignment may be performed by the reverse indicator method or laser. The alignment fixture shall be provided by the contractor when the reverse indicator method is used. (W)
10.5.2 The shaft spacing shall be determined for the compressor and motor at the mechanical center of their axial floats. Measure coupling spacer. Compare with the supplier coupling drawing. Carefully review the coupling drawing.
10.5.3 Align motor to the compressor and record alignment. Contractor is responsible for any temporary jacking systems to move the motor.
10.5.4 Measure and record shaft spacing and compare with drawings.
10.5.5 Trim coupling guard as needed to achieve proper fit.
10.6 Grouting the Compressor, Motor, and/or Base Frame
10.6.1 The compressor, motor and/or base frame shall be grouted to the foundation with either non-shrink-cement grout or epoxy grout as indicated in the project grouting schedule. Grouting shall be according to 4ECE-M13 or 4ACS-640106 as applicable. When epoxy grout is specified, Philadelphia Resins Chockfast Red epoxy grout systems shall be used to grout the compressor, motor and/or base frame to its foundation. On base frames, areas under full depth structural members only shall be grouted. Drain channels through the grout shall be provided to prevent pocketing of moisture, oil, or debris within the base frame.
10.6.2 For epoxy grout, construct leak-proof wooden forms. These shall be located within 25 to 50 mm (1 to 2 in) of the compressor/motor sole plates and/or full depth members of the base frame. Seal forms with silicone caulk. Apply Johnson’s or Butcher’s paste wax to inside of forms to facilitate their future removal. All internal and external corners of the form shall be fitted with a 45-degree chamfer. To help facilitate the grout pour, strategically form 100 by 300 mm (4 by 12 in) head boxes. The head boxes should be located inside the base frame whenever possible. Mask areas adjacent to where the grout will be poured to protect the compressor, motor, and/or base frame from grout splashing.
10.6.3 Before grouting the base frame, ensure the alignment of the compressor and lube oil pump(s) to the motor(s) according to the manufacturer’s installation manual has been completed. (W)
10.6.4 For epoxy grout, ensure the grout forms are adequately supported to prevent collapse or movement under the hydraulic pressure of the grout. The Companys machinery representative shall inspect any grout forms before pouring, as well as witness the actual placement or pouring of grout. Every effort shall be made to ensure a quality grouting is done with no voids in the grouted areas. For epoxy grout, arrange (to the account of the contractor) to have a Philadelphia Resins representative present to ensure a proper grout pour. The compressor and foundation shall be tented to shade from direct sunlight during pour and cure (or placement and cure for non-shrink-cement grout) of the grout. A back-up mixer shall be on hand before starting an epoxy grout pour. (W)
10.6.5 For epoxy grout, precondition all grout materials between 18–27°C (65–80°F) for 48 hours before use.
10.6.6 For epoxy grout, mix two part resin with a power mixer at 250 to 300 rpm. When handling or mixing grout, use appropriate Personal Protective Equipment (PPE) such as goggles, respirators, and gloves. Take care not to ingest air into the resin. Mix resin with the aggregate. For Chockfast Red, the ratio is normally one can resin to four bags aggregate. For larger base frames, this shall be reduced to 3 1/2 bags of aggregate to improve its flow properties. Construct head boxes to facilitate grout pour. Pour grout under compressor base frame. Start at one end and completely fill grout area before moving on. Go back and top off old section to keep grout “head” in contact with the bottom of the base frame. Do not vibrate the grout as a means of helping it flow as this tends to separate the aggregate from the resin binder. Use push tools with flat ends to help distribute the grout, using long strokes rather than short jabs. Violent ramming of the grout shall not be permitted.
10.6.7 After epoxy grout pouring, brush all exposed grout areas using a paintbrush with ITW Philadelphia Resins IMPAX IXT-59 Solvent to provide a smooth, glass-like finish. Repeat as necessary.
10.6.8 Non-shrink-cement grout shall be cured with wet burlap or other approved curing compound for a minimum of three days. Allow non-shrink-cement grout to cure for minimum of seven days before tensioning anchor bolts. Allow epoxy grout to cure a minimum of 48 hours before removing grout forms and tensioning anchor bolts.
10.6.9 For epoxy grout, remove forms and grind all sharp corners. Tape off a straight line at the interface between the Chockfast Red epoxy grout and the concrete. Paint/seal this area with red ITW Philadelphia Resins IMPAX HPU High Performance Urethane Coating to provide a finished appearance.
10.6.10 For epoxy grout, remove Styrofoam expansion joints 1/2 inch below grout surface. Pour red ITW Philadelphia Resins Epoxy Expansion Joint sealant in this groove. Allow material four hours of initial cure time.
10.6.11 Back out all jack bolts. Anchor bolts shall be torqued to 207,000 kPa (30,000 psi) tensile stress with lubricated threads. Refer to Tables 1 and 2 for torque values.
Table 1 Course Pitch Metric Thread-M Profile Anchor Bolt Torques 206.9 MPa (30,000 psi) Internal Bolt Stress
| Nominal Bolt Diameter (mm) | Pitch (mm) | Torque (Newton-meters) | Torque (Foot-pounds) |
| M14 | 2 | 55 | 40 |
| M16 | 2 | 85 | 60 |
| M20 | 2.5 | 165 | 120 |
| M22 | 2.5 | 220 | 165 |
| M24 | 3 | 280 | 210 |
| M27 | 3 | 410 | 305 |
| M30 | 3.5 | 560 | 410 |
| M36 | 4 | 975 | 720 |
| M42 | 4.5 | 1,560 | 1,150 |
| M48 | 5 | 2,340 | 1,725 |
| M56 | 5.5 | 3,765 | 2,775 |
| M64 | 6 | 5,670 | 4,180 |
| M72 | 6 | 8,250 | 6,080 |
| M80 | 6 | 11,500 | 8,485 |
Table 2 Unified National Course (UNC) Screw Thread Anchor Bolt Torques 206.9 MPa (30,000 psi) Internal Bolt Stress
| Nominal Bolt Diameter (Inches) | Number of Threads (Per Inch) | Torque (Foot-pounds) | Torque (Newton-meters) |
| 1/2 | 13 | 30 | 40 |
| 5/8 | 11 | 60 | 80 |
| 3/4 | 10 | 100 | 135 |
| 7/8 | 9 | 160 | 220 |
| 1 | 8 | 245 | 330 |
| 1 1/8 | 7 | 345 | 465 |
| 1 1/4 | 7 | 485 | 660 |
| 1 1/2 | 6 | 845 | 1,145 |
| 1 3/4 | 5 | 1,330 | 1,805 |
| 2 | 4 1/2 | 2,000 | 2,710 |
| 2 1/4 | 4 1/2 | 2,925 | 3,970 |
| 2 1/2 | 4 | 4,000 | 5,425 |
| 2 3/4 | 4 | 5,425 | 7,355 |
| 3 | 4 | 7,165 | 9,715 |
Notes:
All torque values are based on anchor bolts and nut/washer bearing surfaces well lubricated with a copper-graphite or copper/aluminum-graphite general purpose anti-seize compound. These torque values are not for use with Moly-Kote (molybdenum disulfide) anti-seize compounds. Foot-pounds times 1.356 equals Newton-meters.
An alternate approach, considering the yield strength of the bolt, is to torque to 1/3 of the yield strength for lubricated bolting, to 2/3 of yield strength for dry bolting, or 125% of yield strength for galvanized bolting. The bolt stretch required may be obtained by use of torque wrenches or by considering bolt thread pitch and turning the nut a specific number of flats.
Figure 1
Expansion Joint Detail Using the Secondary Seal Design
|
Figure 2
Anchor Bolt and Leveling Screw Assembly
10.6.12 Check for grout softness with a dial indicator. Equipment movement at each anchor bolt shall not exceed 0.025 mm (0.001 in) after torquing.
10.6.13 Seal off all anchor bolts and jack bolt holes with silicone caulk.
10.7 Final Alignment
10.7.1 Perform the final alignment by the reverse indicator method using the alignment fixture supplied by the contractor or laser alignment device supplied by the contractor. (W)
10.7.2 Target alignment and allowable deviation will be provided by the machinery engineer.
10.7.3 The shaft axial spacing shall be checked and recorded with the compressor and motor at the mechanical center of their axial floats. Compare the motor mechanical center position with the magnetic center position determined during the uncoupled run. (W)
10.7.4 Measure the coupling spacer. Compare with the supplier coupling drawing and carefully review the coupling drawing.
10.7.5 Check and record the motor to compressor alignment. (W)
10.8 Installation and Erection of Piping and Auxiliary Systems
10.8.1 Any vapor pressure inhibitor (VPI) capsules used for preservation of the compressor and/or base frame assembly shall be removed.
10.8.2 The contractor shall make the external piping ties into the compressor suction and discharge. At this time, scroll deflections shall be checked by use of a dial indicator. Unless otherwise specified by the manufacturer, maximum deflection at the top and side of scroll shall be 0.05 mm (0.002 in). (W)
10.8.3 Following the fit-up of the process piping, it shall be removed and thoroughly cleaned to remove all scale and foreign material from both the inside and outside. Following the cleaning, a nitrogen purge shall be established on the piping.
10.8.4 The contractor shall make cooler cooling water supply and return piping connections, oil cooler water connections, condensate vent and drain connections, and drain bottle connections on the coolers.
10.8.5 If not part of the base frame assembly, the contractor shall make up the lube oil supply and return piping to the compressor gearbox. Ensure the return lines have the proper slope of 42 mm/m (0.5 in/ft).
10.8.6 If not part of the base frame assembly, the contractor shall pipe up to all seal gas connections. The contractor shall run the nitrogen purge and vent lines to the compressor and/or base frame assembly.
10.9 Instrument Connections
10.9.1 The contractor shall install and wire up the local control panel (if applicable) and wire up the auxiliary oil pump and oil heater.
10.9.2 The contractor shall wire all instrumentation through aluminum conduit or in cable trays for European installations.
10.9.3 The contractor shall install all local instrumentation not installed on the package during shipping in accordance with the project flowsheet drawings.
10.9.4 Install all compressor, motor, and/or base frame assembly electrical power connections. Install all compressor, motor and auxiliary instrumentation not yet installed according to the General Arrangement Drawing and the flowsheet. The contractor shall also install any valves required for instrument taps. Instrumentation should be easily accessible when possible. Install any heat tracing/insulation that is required by the installation drawings.
10.10 Equipment Preservation After Erection
10.10.1 Plug any holes that will allow dirt or rain to enter.
10.10.2 Maintain a nitrogen blanket on the compressor and all process gas components until commissioning and start-up.
- COMPRESSOR AND MOTOR COMMISSIONING
11.1 Pre-Commissioning Activities
11.1.1 Before the start of commissioning, the Companys machinery representative will verify that all systems on the compressor, motor, and/or base frame assembly are consistent with the flow diagram.
11.1.2 The contractor shall assist Companys in checking the installation of all instruments and gauges. Perform function tests on all instrumentation and control logic. Set points shall be reviewed.
11.1.3 Check that all instrumentation is serviceable and in working condition and that test certificates are available (where applicable) for locally and remotely mounted instrumentation.
11.1.4 Check all process transmitters for proper operation and calibration.
11.1.5 Check local temperature elements/remote temperature indicators for proper signal relay of process gas temperatures.
11.1.6 Proper operation of all control valves and compressor guide vanes shall be verified. Loop check and calibrate the flow rate and anti-surge control system to ensure proper operation.
11.1.7 Make sure all local cooling water temperature gauges for the gas cooler, oil cooler, and motor cooler are serviceable and calibrated properly.
11.1.8 Check the vibration probes, proximitors, and monitors for all shaft vibration positions.
11.1.9 Check all probes with a Wobulator and record characteristics.
11.1.10 Alarm and shutdowns will be set and recorded as specified in the Switch Settings Sheet during full load operation.
11.1.11 Check that all local pressure indicators, level gauge, and temperature indicators are serviceable and calibrated properly.
11.1.12 Check all lube oil system transmitters for proper function and calibration.
11.1.13 Function check the lube oil heaters and associated controls.
11.1.14 The cooling water circuit will be flushed coincident with commissioning of the cooling tower/cooling water system. The circuit will be checked for leaks, air bled off at high point vents, and low points blown down to remove trash. Open gas side drain of the gas cooler and check for water leakage.
11.1.15 Before compressor motor commissioning the contractor shall disconnect the motor space heater(s) temporary power supply and connect the permanent power supply.
11.2 Commissioning the Lube Oil System
11.2.1 The Companys machinery representative will verify that the lube oil system is consistent with the flow diagram.
11.2.2 Open the oil filter housing(s) and ensure the filter element(s) is(are) installed properly. (W)
11.2.3 If not previously checked and recorded, check the alignment of the oil pump(s). Make sure shims used for alignment are stainless steel. A record of the final alignment readings shall be kept and given to the Companys machinery representative. (W)
11.2.4 Bump the oil pump motor(s) to verify proper rotation. Install the coupling(s)and guard(s). (W)
11.2.5 Inspect gearing and gear case for rust and corrosion through the gear inspection port. (W)
11.2.6 Inspect and clean suction lines and suction strainers to the main oil pump and auxiliary oil pump before filling reservoir with oil. (W)
11.2.7 Inspect oil reservoir internals. Check for and remove rust, particles, and moisture. Check internal paint and touch up as necessary. (W)
11.2.8 Oil reservoir shall be completely cleaned and painted before inspection cover is replaced.
11.2.9 Install screens and lube oil jumpers.
11.2.10 Set up flush lines so that the compressor bearings and gearbox will be flushed but the motor bearings will be bypassed. Lube oil line bypassing shall be accomplished by connecting the supply and drain lines with additional piping or hosing for the motor bearings.
11.2.11 A 100 mesh screen must be installed in each bearing supply connection and the gearbox supply connection.
11.2.12 Make sure no Teflon tape has been used in the lube oil system.
11.2.13 Check that the lube oil reservoir drain valve is tight.
11.2.14 Check that the temperature control valve is installed correctly.
11.2.15 The contractor shall provide and fill the reservoir to normal level with oil designated on the lube oil schedule. Strain oil with 100 mesh screen while filling.
11.2.16 Turn on lube oil heaters and heat the oil. Attempt to achieve an oil temperature as close as possible to 50°C (120°F).
11.2.17 Turn on auxiliary oil pump and circulate oil. Set lube oil pressure control valve to required pressure.
11.2.18 Check for oil leaks and correct as necessary.
11.2.19 Bleed air from filters and other high point vents as necessary.
11.2.20 Circulate oil through system as required to clean up system.
11.2.21 Regularly check oil temperature and differential pressure across filters.
11.2.22 Hammer oil pipework and pipework welds to dislodge any foreign matter.
11.2.23 Circulate oil for 30 minutes and then check screen for cleanliness. (W)
11.2.24 Clean screens and reinstall.
11.2.25 Restart lube oil pump. After two hours recheck screens. (W)
11.2.26 If particles persistently appear on the screen, alternately turn the lube oil heater off and on to cycle oil temperature.
11.2.27 Continue to circulate and check screens at four hour intervals until the Company machinery representative is satisfied that the screens are clean of all foreign matter. Renew the oil filter element(s) (supplied by Companys) after completion of the oil flush. Remove temporary filter screen and jumpers after flush. (W)
11.2.28 Remove all bypass lines and pipe up the gearbox and couplings as required for normal operation.
11.2.29 Fill lube oil reservoir to correct level. Strain oil with 100 mesh screen.
11.2.30 Set oil reservoir heater to normal set temperature.
11.2.31 Restart auxiliary lube oil pump when oil tank temperature is at correct level.
11.2.32 Open filter air vents to make sure filter(s) are full of oil.
11.2.33 Open air vents on oil cooler and all high points.
11.2.34 Check that the oil pressure as indicated on the lube oil pressure indicator is correct. If not, reset the pressure control valve.
11.2.35 Recheck system for oil leaks and repair as needed.
11.3 Commissioning the Control, Instrumentation, Purge, and Process Gas Systems
11.3.1 The contractor shall assist Companys in checking the installation of all instruments. Set the oil pump pressure control valve as required, and function check the temperature control valve, and low oil pressure switch.
11.3.2 Commission all nitrogen purge and seal systems for the compressor, making sure that an adequate supply of nitrogen is attained. Check that all seal nitrogen lines to each stage are clean from dirt, rust, and moisture. Clean if necessary. Verify that all transmitters are serviceable and in working condition. Verify that all control valves are in proper operating condition. Stroke the valves. Supply nitrogen gas to the seals and check that the correct pressures and flows are supplied to the seals. Leak test and repair piping as required. (W)
11.3.3 Before starting any unloaded or loaded runs, functional tests of any instrumentation and control circuits not yet done must be completed. This includes shutdown, alarm, and permissive start circuits. Ensure the inlet control valve or guide vanes are properly set and the devices operate over their entire range. (W)
11.3.4 Set points of all alarm and shutdown switches shall be checked. (W)
11.3.5 Ensure proper operation and set up of any vibration transmitters or position transmitters.
11.3.6 The Companys machinery representative will function test the recycle valve, inlet control valve and/or inlet guides vanes, and controllers.
11.3.7 Inspect all of the gas suction filters, install, clean and/or replace elements as required. (W)
11.4 Commissioning Compressor Motor
11.4.1 The contractor shall assist in performing the final compressor motor inspections and checkouts.
11.4.2 Check baffling and fans to see that motor receives proper air flow. (W)
11.4.3 Check motor cover dust seal clearances on motor.
11.4.4 Visually and manually inspect for loose fan blades, loose support bolts, loose shroud bolts, and debris in motor. (W)
11.4.5 Check bearing clearance and condition of oil rings and record results. (W)
11.4.6 Check to see that the bearing seals are nonferrous and of knife-edge configuration.
11.4.7 Record the seal clearances for the following (W):
- Drive end inboard
- Drive end outboard
- Opposite drive end inboard
- Opposite drive end outboard
11.4.8 For medium voltage motors, check all internal motor instruments (temperature switches, level switches, RTDs). Calibrate and function check each device. (W)
11.4.9 Megger motor, perform polarization index. Record results on proper forms. Take a 10-minute reading. (W)
11.4.10 Megger motor feeders. (W)
11.4.11 If applicable, megger lightning arrestors and capacitors in motors terminal box. (W)
11.4.12 Verify connections of ground loop on entire motor/compressor system. (W)
11.4.13 Check bearing insulation with 500-volt megger (minimum 50 K ohms). Record results for inboard and outboard bearings. (W)
11.4.14 Verify compression-type lugs on all connections. (W)
11.4.15 Verify all electrical power connections to the motor. (W)
11.4.16 For medium voltage motors, ensure that the motor bearings have the proper lubrication. (W)
11.4.17 Verify that the lube oil system has been properly flushed. Verify proper pressure, adequate flow, and proper temperature. Check oil systems for leaks.
11.4.18 Operate each field protective device to confirm starter trip out from the test position. (W)
11.4.19 Verify shutdown from both instrument control panel and emergency stop locations. (W)
11.4.20 Turn shaft to verify free movement. Mark or verify rotor shoulder to shoulder travel.
11.4.21 Clear all unnecessary personnel from the motor/compressor area and electrical room.
11.4.22 Bypass all nonessential interlock contacts.
11.4.23 Rack starter to the energized position. Reset indicating flags.
11.4.24 Bump motor and observe rotation. If the motor rotation does not comply with the direction of the rotation arrow on the motor or compressor casing, the electrical leads must be reversed. (W)
11.4.25 Prior to uncoupled run, rack in starter. Start motor, allow to come up to speed, and then trip. Listen for noise or other disturbance on rundown. (W)
11.4.26 Verify oil ring rotation. (W)
11.4.27 Restart and run the motor uncoupled until the bearing temperatures stabilize or its continuing rise warrants shutdown. While the motor is energized, mark magnetic center. (W)
11.4.28 Record the following motor data as required (W):
- Line amps
- KVAR
- Bearing temperatures
- Oil temperature
- Stator temperatures
- Any other relevant data
11.4.29 Voltage shall be measured from shaft to ground on the non-drive end with the drive end bearing attached by a ground strap. With the ground strap removed, measure the following voltages:
- Drive end shaft to ground
- Non-drive end shaft to ground
- Drive end shaft to non-drive end shaft
Note: Rack out and lock out to install coupling after run.
11.4.30 If not previously checked and recorded, check the alignment of the compressor/motor. Stainless steel shims shall be used under the motor feet for alignment. Ensure the shims have a cut out area to allow drilling for dowel pins. After final alignment and a successful compressor run-in, dowel the motor feet. A record of the final alignment readings shall be kept and given to Companys. (W)
11.4.31 Install coupling per drawing.
11.4.32 Check and record coupling float. (W)
11.4.33 Install coupling guard.
- Compressor Start-UP and Test Runs (W)
Note: In general, the following runs shall be made:
- Bump uncoupled motor
- Run uncoupled motor
- Bump coupled compressor train up almost to speed
- 4-hour test run on nitrogen
- 4-hour test run on process gas (after acceptance by Companys)
Note: Vibration and temperature readings shall be recorded during the 4-hour test by the Companys machinery representative.
Note: After the initial run the motor shall be doweled.
12.1 General
12.1.1 Inspect general area for cleanliness. All debris, sand, oil, and excess construction material shall be removed.
12.1.2 Seal up all anchor bolt holes with RTV to avoid collection of water or oil.
12.1.3 Install all grating as required.
12.1.4 Ensure there are no locations where oil might accumulate.
12.2 Piping and Coolers
12.2.1 Check proper alignment of piping connections (e.g., interstage flanges, lube oil, and seal gas) to the compressor.
12.2.2 Check that the relief valves are installed and verify the proper setting on the nameplate. Seal wire shall be undisturbed.
12.2.3 Check that all blanks have been removed from the cooler shell side safety disc connections and that the correct safety discs have been installed.
12.2.4 Check any piping expansion joints for integrity. Verify that the tie rods and piping hangers are properly adjusted and set.
12.3 Lube System
12.3.1 Check that the lube reservoir is at the correct level. Add lubricating oil as necessary.
12.3.2 Check the operation of the lube oil heater and set the thermostat at 32°C (90°F).
12.3.3 Start the auxiliary oil pump and set pressure regulating valve at the correct pressure. Adjust flow rates to the individual compressor, gear, and motor bearings. Check the flows in the return sight glasses.
12.3.4 Verify that the AMOT lube oil temperature control valve porting is correct and the valve is operating properly at the correct temperature setting.
12.3.5 Inspect the lube system after 15 minutes of operation for leaks. Check the isolation ports and dry sump drains for signs of oil. There shall be no migration of oil on the compressor shaft.
12.4 Electrical
12.4.1 Confirm completion of the required installation and pre-commissioning checks on the drive motor.
12.4.2 If not done previously, run the drive motor uncoupled.
19.4.3 Verify that for the compressor control circuit, the low lube oil pressure is on a two-second time delay.
12.5 Control Devices and Instrumentation
12.5.1 Calibrate the cooling water outlet temperature gauges to indicate within 1°C (2°F).
12.5.2 Check the following automatic valves/guide vanes for correct operation. “Jumper” the shutdown relay.
12.5.2.1 Inlet Control Valve/Guide Vanes
- Verify control valve/guide vanes fail-closed on loss of air.
- Verify the actual valve/guide vane(s) position is as indicated.
- Set controller so that the valve/guide vane(s) opens on increasing suction pressure and throttles on decreasing suction pressure.
- Verify that the valve/guide vane(s) strokes smoothly and fully seats in the closed position.
- Open the valve/guide vane(s). Remove the “jumper” and verify that the valve/guide vane(s) closes in three seconds or less.
12.5.2.2 Recycle Valves
- Valve shall fail-open on loss of air.
- Simulate the operation of the anti-surge controller. Verify valve action to open on approach to surge line. The control loop shall be set for fast response. (W)
- Verify that the valve strokes smoothly and fully seats in the closed position. (W)
- Close the valve. Remove the “jumper” and verify that the valve opens in two seconds or less. (W)
12.5.3 Check out the vibration and position monitoring system. (W)
12.5.3.1 Wobulate all vibration probes and check proximitor outputs. (W)
12.5.3.2 Turn on the vibration and axial position monitor power. The green light will come on when the gap voltages are adjusted to within the proper voltage range.
12.5.3.3 Install vibration probes. Probes shall be adjusted for the proper gap voltages after all mechanical checks are performed on the gear and compressor.
12.5.3.4 When using a vibration monitoring system provided by the vibration probe manufacturer, adjust each probe closer to the shaft and then away from the shaft to determine if the green (okay) light goes out each time indicating the integrity of the circuitry. The annunciator alarm shall flash when the green light is lost.
12.5.3.5 Verify that each probe is set to obtain correct voltage gap.
12.5.3.6 Axial probe gap voltages shall be set for -7.5 Vdc with the rotors at the centers of their thrust clearance. Check that the monitors indicate actual thrust bearing clearance.
12.5.3.7 Mark the probe number and its gap voltage on its proximitor using a marking pen.
12.5.3.8 Adjust the alarm (alert) and shut down (danger) set points. (W)
- Initial vibration set points shall be:
- Alarm 0.05 mm (2.0 mils) above normal
- Shutdown 0.10 mm (4.0 mils) above normal
- Axial set points shall be:
- Alarm 0.13 mm (5 mils) beyond thrust bearing float
- Shutdown 0.25 mm (10 mils) beyond thrust bearing float
12.6 Start-up (W)
12.6.1 Ensure that compressor is completely isolated from the process gas by using the block valves around each service. Follow Plant lock-out/tag-out procedures. (W)
12.6.2 Open the recycle valve. The control shall be in the manual mode.
12.6.3 The inlet control valve/guide vane(s) shall be closed. Check that the controller is set on Manual to maintain the valve/guide vane(s) closed and the switch is set for Local control.
12.6.4 Pressurize/purge over the compressor to nitrogen by cracking open the nitrogen inlet and vent valves.
12.6.5 Establish cooling water flows to the gas coolers, motor cooler, and lube oil cooler. Vent air at the high point bleeds in the cooling water system.
12.6.6 Establish seal nitrogen.
12.6.7 Check that the cooler bonnet drains for cooling water leakage to the gas side of the coolers.
12.6.8 Check that the lube oil reservoir level is satisfactory. Turn on the lube oil heater and heat the lube oil to 32.2°C (90°F).
12.6.9 Start the auxiliary oil pump by racking in the breaker in the switch gear room. Put the auxiliary oil pump ON-AUTO-OFF switch in the ON position.
12.6.10 Check that the lube oil supply pressure is as required.
12.6.11 Vent the oil filters and check the oil filter differential pressure.
12.6.12 After 15 minutes, survey the train for oil leaks. Correct as necessary.
12.6.13 Also check the compressor bearing isolation ports and dry sump drains for signs of oil.
12.6.14 Place the vibration monitor trip on BYPASS. Reset all alarms and trips.
12.6.15 Energize the main switchgear. The READY light shall come on.
12.6.16 Energize the motor for two seconds to bump the compressor. Record the slow roll vibrations for each probe during the coast down.
12.6.17 Start the compressor.
12.6.18 When the motor is up to speed, pressurize the suction with nitrogen. Slowly throttle the recycle valve to increase the discharge pressure.
12.6.19 Turn the auxiliary oil pump off and check that the main oil pump properly maintains the lube oil supply pressure.
12.6.20 Check the vibration levels and turn off the vibration trip by-pass.
12.6.21 Allow the compressor conditions to stabilize.
12.6.22 Verify the operating parameters, vibration, and temperatures are normal.
12.6.23 Slowly open the suction throttle valve or inlet guide vanes using the panel controller. Bring the discharge pressure up as required. The discharge pressure controller shall come on control.
12.6.24 Set the anti-surge control on AUTO.
- 7 Test Runs (W)
12.7.1 After compressor operating parameters have stabilized, run on nitrogen for a minimum of four hours of satisfactory mechanical operation.
12.7.2 Consideration shall be given to the maximum operating pressure and temperature of each piece of equipment in the system (compressor case, piping, coolers, expansion joints, and relief valves).
12.7.3 During the nitrogen test, the compressor shall be operated at the maximum discharge pressure that the machine is capable of producing with nitrogen. This maximum pressure shall be achieved by bringing the compressor in surge and then backing down until a stable point is achieved. A leak check of the system piping and cooler shall be made.
12.7.4 Stabilize the compressor for sufficient time at each operating point. Take radial and axial vibration data at each operating point listed in paragraph 12.7.6 and log the following data:
- Vibration levels
- Axial positions
- Oil pressures and temperatures
- Process flow rate, pressures, and temperatures
- Cooling water temperatures
12.7.5 Analyze the following vibration signals at each operating point:
- Unfiltered and filtered (if possible) vibration wave form signatures
- Spectra vibration levels
Note: Each vibration spectrum shall be closely examined with attention given to vibration components at one-half running speed, multiples of running speed, and at the first critical speed. The amplitudes and causes of non-synchronous vibration components shall also be considered.
12.7.6 Operate the compressor and take the data listed in paragraph 12.7.4 at the following points:
- Normal operating point with design flow rate and discharge pressure
- Maximum pressure condition (with maximum suction pressure)
- Maximum flow rate condition (limited by compressor or the motor current)
- Surge point at reduced flow rate with normal discharge pressure
12.7.7 Leak check the piping system.
12.7.8 Functionally check and verify the operation of the anti-surge control system.
12.7.9 Check system venting time.
12.7.10 Following the completion of testing of all operating points, adjust the suction and discharge pressures to the normal design values and operate on total recycle.
12.7.11 Trip the compressor by pressing the STOP button on the compressor panel.
12.7.12 Record (tape recording recommended) the vibration signals during the compressor coast down after the trip.
12.7.13 Remove inlet filter elements and individual stage suction screens for inspection and clean/replace as necessary before reinstalling.
- ACCEPTANCE
13.1 Companys’ acceptance of the compressor will be by signature of the Companys representative or his designee.