Section – 1. General …………………………………………………………
1.4 Definition of Terms 1.5 Referenced Publications
Section – 2. Basic Design ………………………………………………….
2.1 General 2.2 Pressure Casings 2.3 Casing Connections ………………………………………2.4 External Forces and Moments 2.5 Rotating Elements 2.6 Mechanical Seals and Conventional Packing ……2.8 Lubrication 2.9 Materials 2.10 Nameplates and Rotation Arrows ………………….2.12 Critical Speeds and Resonance 2.13 Vibration and Balancing
Section – 3. Accessories ……………………………………………………3.1 Drivers 3.2 Couplings and Guards 3.3 Mounting Plates ……………………………………………3.5 Piping 3.7 Instrumentation and Electrical
Section – 4. Inspection, Testing and Preparation for Shipment .4.2 Inspection 4.3 Tests 4.4 Preparation for Shipment ………………………………..
Section – 5. Vendor’s Data 5.2 Proposals 5.3 Contract Data ……………………………………………….
1. Scope
American Petroleum Institute (API) standard 676, Positive Displacement Pumps – Rotary, Second Edition,
dated December 1994 is adopted as a SABIC Engineering Standard (SES) with the following addendum.
2. General
Positive displacement rotary pumps manufactured and packaged to this standard shall comply with
API 676, Second Edition, except as modified herein or as set forth in data sheets, project specifications, or
the purchase order.
3. Addenda
The following section, subsection and paragraph numbers refer to API 676, Second Edition.
1. General
1.4 Definition of Terms
1.4.14 Add the following sentence:
Pump efficiency includes both the mechanical efficiency and volumetric efficiency of the pump.
1.5 Referenced Publications
1.5.2 Add the following new paragraph:
The following documents are part of this addendum. The latest issues, amendments, and supplements to
these documents shall apply unless otherwise indicated.
SABIC Engineering Standards (SES)
E02-E02 Electrical Area Classification
E06-S01 Induction Motors 150 kW (200 HP) and Below
E06-S02 Induction Motors 185 kW (250 HP) and Above
E19-S01 Packaged Equipment Electrical Requirements
G02-S01 Shaft Sealing Systems for Centrifugal and Rotary Pumps
G03-S01 Lubrication, Shaft Sealing, Control Oil Systems and Auxiliaries
G06-S01 General Purpose Steam Turbines
G07-S01 General Purpose Gears
G20-C01 Installation of Rotating Machinery and Criteria for Installation Design
G22-S02 Specification for Skid Mounted Equipment
S20-G01 Plant Equipment Noise Levels
X01-S03 Instrumentation for Packaged Equipment
International Organization for Standardization (ISO)
ISO 1940 Mechanical Vibration, Balance Quality Requirements of Rigid Rotors
Structural Steel Painting Council (SSPC)
SP10 Near White Blast Cleaning
2 Basic Design
2.1 General
2.1.3 Add the following note:
A single speed positive displacement rotary pump essentially has only one flow rate, which has to match
the normal operating point specified. Due to the normal phenomenon of slip in rotary pumps, flow rate will
appear to diminish with increased differential pressure or reduced viscosity of the pumped fluid. The rated
differential pressure, maximum viscosity and rated flow rate set the rated power requirements for the
pump.
2.1.4 Add the following sentences:
Unless otherwise specified, the maximum allowable sound pressure level for the pump, its drive train and
accessories shall be 85 dBA at 1 m. See SES S20-G01.
2.1.7 Add the following sentence:
Motors shall also conform to SES E02-E02.
2.1.11 Substitute the paragraph as follows:
Unless otherwise specified, pumps and their auxiliaries shall be suitable for outdoor installation in an
operating facility in Saudi Arabia. SABIC will note design atmospheric conditions on the pump data sheets.
2.1.14 Add the following new paragraph:
Pumps shall be supplied by vendors qualified by experience in manufacturing the proposed equipment. To
qualify, vendor shall have manufactured, at the proposed point of manufacture, at least two pumps of
comparable flow rate, differential pressure and speed. These pumps shall have been in service and
performing satisfactorily for at least one year. Vendor shall provide, upon request, a detailed user list of
pumps in service in similar applications.
2.2 Pressure Casings
2.2.9 Add the following new paragraph:
Vendor’s proposal shall clearly state if the pump design offered includes a removable casing liner.
2.2.10 Add the following new paragraph:
Chrome plating or other types of hard surface coating of the pump casing bore shall not be allowed without
specific SABIC permission.
2.3 Casing Connections
2.3.1 The decision is as follows:
Inlet and outlet connections shall be flanged. Small pumps with inlet and outlet connections of 1 1/2
in and
smaller may use NPS threaded connections if permitted on the data sheet.
2.3.6.3 Substitute the paragraph as follows:
The vendor shall obtain specific written approval from SABIC to use flanges that are thicker or have a
larger outside diameter than required by ASME B16.5 or ASME B16.47.
2.3.6.4 Substitute the paragraph as follows:
Connections other than those covered by ASME B16.5 or ASME B16.47 shall require SABIC’s written
approval. When other connections are allowed, the mating vendor shall furnish the parts.
2.5 Rotating Elements
2.5.2 Substitute the paragraph as follows:
Rotors and shafts shall be of sufficient stiffness and material compatibility to prevent wear between the
rotor bodies and casing, and between gear timed rotor bodies, at the most unfavorable specified condition,
including 110 percent of the relief valve set pressure. Rotor bodies not integral with the shaft shall be
securely fixed to the shaft to prevent unintended relative motion under any operating condition. Separate
rotor bodies on larger pumps shall be fixed using keys and high torque locknuts. Pins or setscrews may
only be used to secure the rotor bodies on pumps with a differential pressure less than 2 MPa.
2.5.3 Add the following sentences
Timing gears shall be hardened and ground for long operating life. Pumps not handling a clean,
self-lubricating fluid shall be fitted with external bearings and timing gears.
2.6 Mechanical Seals and Conventional Packing
2.6.1 Mechanical Seals
2.6.1.2 Substitute the paragraph as follows:
Mechanical seals shall be of the single balanced type (one rotating face per seal chamber) with either a
sliding gasket or a bellows between the axially movable face and the shaft sleeve or housing. Unbalanced
seals shall be furnished when specified or approved by SABIC. Other special configurations may be
specified, or the vendor may recommend them, if required for the service. Cartridge seals shall be
required unless otherwise specifically approved by SABIC. The mechanical seals shall conform to
SES G02-S01.
2.6.2.3 The decision is as follows:
Lantern rings shall be provided as specified when packing is used.
2.6.2.6 Add the following sentences:
Packing glands shall be fabricated from carbon steel or alloy steel. Cast iron glands shall not be
acceptable.
2.8 Lubrication
2. 8.1 Add the following sentence
When specified, pumps with external bearings shall be fitted with provisions for pure or purge oil mist
lubrication.
2.8.3 The decision is as follows:
Unless otherwise specified, bearing housings for oil lubricated non-pressure fed bearings shall be
provided with
1
/
in NPT minimum tapped and plugged fill and drain openings. They shall be equipped with
0.5 L minimum size constant level sight feed oilers, supported independently of the oil piping, with
2
translucent containers not subject to sunlight or heat induced opacity, and with protected wire cages. A
permanent indication of proper oil level shall be accurately located and clearly marked on the outside of
the bearing housings with permanent metal tags; marks inscribed in the castings; or other durable means.
2.8.5 Add the following new paragraph:
When a pressurized or circulating lubrication system is required by a gear or driver, or both, the pump
bearing oil may be supplied from that system. SABIC will specify the supplier of the complete lubrication
system. When specified, the system shall conform to SES G03-S01.
2.9 Materials
2.9.1 General
2.9.1.1 Add the following sentence:
Unless otherwise specified, all pressure containing parts shall be fabricated from carbon steel or alloy
steel. Cast iron shall not be acceptable unless specifically approved by SABIC.
2.9.4 Welding
2.9.4.5.1 The decision is as follows:
Connections welded to pressure casings shall be inspected by 100 percent radiography, magnetic particle
inspection, or liquid penetrant inspection, as applicable.
2.10 Nameplates and Rotation Arrows
2.10.3 The decision is as follows:
SI units shall be used on the equipment nameplates.
Add the following new sub-section:
2.12 Critical Speeds and Resonance
2.12.1 Unless otherwise specified, the separation margin of critical speeds from all lateral modes, including
rigid and bending, shall be at least 25 percent over the maximum continuous speed. This margin is
intended to prevent the overlapping of the resonance envelope into the operating speed range.
2.12.2 Resonance of support systems within the vendor’s scope of supply shall not occur within the
specified operating speed range or the specified separation margins, unless the resonance is critically
damped.
2.12.3 Bearing housing resonance shall not occur within the specified operating speed range or specified
separation margins.
2.12.4 Vendor shall determine that the drive train critical speeds are compatible with the critical speed of
the machinery being supplied, and that the combination is suitable for the specified operating speed range.
A list of all undesirable speeds from zero to trip shall be submitted to SABIC for review, and shall be
included in the instruction manual for future guidance.
2.13 Vibration and Balancing
Each rotating assembly shall be dynamically balanced. The residual unbalance shall not exceed the values
of an ISO balance quality grade of G 2.5, as specified in ISO 1940.
3. Accessories
3.1 Drivers
3.1.4 Substitute the first sentence with the following:
Motor drivers shall conform to SES E06-S01 or E06-S02 as applicable.
3.1.7 Substitute the paragraph as follows:
Steam turbine drivers shall conform to SES G06-S01. Steam turbine drivers shall be sized to continuously
deliver 110 percent of the maximum power required for the specified conditions while operating at a
corresponding speed with the specified steam conditions.
3.1.8 Substitute the paragraph as follows:
Gears, other than rotor timing gears, shall conform to SES G07-S01.
3.1.10 Add the following new paragraph:
Motors for auxiliary equipment shall comply with SES E06-S01.
3.2 Couplings and Guards
3.2.1 Substitute the paragraph as follows:
Vendor shall furnish non-lubricated disc or diaphragm type spacer couplings and non-sparking coupling
guards between drivers and pumps. Disc type couplings shall be furnished with stainless steel discs.
Coupling make will be specified by SABIC, or mutually agreed upon by SABIC and vendor.
3.3 Mounting Plates
3.3.1 General
3.3.1.1 The decision is as follows:
Unless otherwise specified, pumps shall be furnished mounted on a baseplate with the driver and all
auxiliaries.
3.3.1.2.3 Substitute the paragraph as follows:
Machinery supports shall be designed to limit a change of alignment caused by the worst combination of
pressure, torque and allowable piping stress to 25
µm (0.001 in) at the coupling flange. See 2.4.
3.3.1.2.5 The decision is as follows:
Unless otherwise specified, vendor shall commercially sand blast all grout contact surfaces of the
baseplate, in accordance with SSPC SP 10, and coat those surfaces with inorganic zinc silicate in
preparation for epoxy grouting.
3.3.2 Baseplates
3.3.2.1 The decision is as follows:
Fabricated steel baseplates shall be preferred.
3.3.2.8 The decision is as follows:
Baseplates shall be drain-rim or drain-pan type, with a raised lip.
Add the following new paragraphs:
3.3.2.9 The underside of fabricated baseplates beneath pump and driver supports shall be welded to
reinforcing cross members, and the members shall be shaped to lock positively into the grout. All welding
shall be continuous. Stitch welding, top or bottom, shall be unacceptable.
3.5 Piping
3.5.1 Add the following sentence
Piping design shall also comply with SES G03-S01.
Add the following new sub-section
3.7 Instrumentation and Electrical
3.7.1 Instrumentation shall conform to SES X01-S03.
3.7.2 Electrical components shall conform to SES E19-S01.
3.7.3 All controls, instrumentation and electrical components shall be suitable for outdoor installation in the
environmental and hazardous area classification stated on the data sheet.
4. Inspection, Testing and Preparation for Shipment
4.2 Inspection
4.2.3 Mechanical Inspection
4.2.3.3 The decision is as follows:
A cleanliness inspection shall be required before final closure of equipment.
4.3 Tests
4.3.2 Hydrostatic Test
4.3.2.1 Add the following sentence:
Hydrostatic tests shall not be performed on any part or component until all machining and fabrication on
that part has been completed.
4.3.3 Mechanical Running Test
Add the following sentences:
During the shop test of the assembled pump, operating at maximum continuous speed or at any other
speed within the specified operating speed range, the maximum allowable unfiltered peak vibration
velocity, measured on the bearing housing in any radial plane, shall not exceed 5.0 mm/s or 2.5 mm/s at
running frequency. At the trip speed of the driver, the vibration shall not exceed 6.0 mm/s unfiltered
velocity.
4.3.4 Optional Tests
4.3.4.3 NPSH Test
The decision is as follows:
A NPSH test shall be required if the NPSHA exceeds the NPSHR by 0.9 m (3 ft). If a NPSH test is
required, a performance test shall also be performed.
4.4 Preparation for Shipment
4.4.1 Add the following sentence:
Preparation for shipment shall also comply with SES G20-C01.
5. Vendor’s Data
5.2 Proposals
5.2.3 Technical Data
5.2.3.b Substitute the paragraph as follows:
Noise data shall be provided in accordance with SES S20-G01.
5.3 Contract Data
5.3.2 Drawings
5.3.2 Add the following sentence:
Drawings furnished shall also include mechanical seal outline drawings, mechanical seal cross-sectional
drawings, mechanical seal flush arrangement and detail drawings, and mechanical seal support system
detail drawings.