Temperature Swing Adsorber Vessels (General Requirements)

Table of Contents

Section	Title	Page

	Purpose	2
	Scope	2
	Related Documents	2
	Extent of Supply	3
	Pressure Vessel	3
	Adsorber Bed Support Screens and Other Internals	9
	Cleaning	10
	Painting of External Surfaces	10
	Inspection and Quality Plan	10
	Calculations	11
	Information to be Supplied with the Bid	11
	Spare Parts	11
	Change Log	12

	Sampling Probes	12
	Design of Wall Gas Baffle	13
	Inlet Nozzle/Spool Support/Withdrawal Detail (Vertical Vessels with Skirts)	14
	Skirt Attachment Detail	15
	Typical Lifting Lug Detail	16
	Typical Lifting Trunnion Detail	16
	Typical Lower Manway Detail for Horizontal Vessels	17
	Installation of Internal Filters	18
	PTFE-faced Slider Plate for Sliding Saddle and Dummy Spacer Plate for Fixed Saddle for Horizontal Vessels	20

PURPOSE

1.1 This global engineering specification defines the minimum requirements for the supply of Temperature Swing Adsorber pressure vessels with any type of screen, hereinafter referred to as TSA vessels.

SCOPE

2.1 This specification covers the design, fabrication, cleaning, painting, internal treatment, inspection, and documentation requirements for TSA vessels. It shall be read in conjunction with the specification applicable to the type of bed support screen, the Project Equipment Specification (PES), and the Purchase Order (PO) and its attachments.

2.2 This specification is intended for TSA vessels in general service. General service includes air and nitrogen. Supplementary requirements may be required for other services (for example, hydrogen).

RELATED DOCUMENTS

3.1 Air Products Engineering Documents

4WEQ-1010 Supplier-Designed, Shop-Fabricated Pressure Vessels

4WEQ-1011 Requirements for Pneumatic Testing of Carbon and Low Alloy Steel Pressure Vessels

4WEQ-1020 Insulation Supports for Warm- and High-Temperature Heat Exchangers and Pressure Vessels

4WEQ-1030 Shape Imperfection Measurement and Tolerances for Pressure Vessels in Severe Cyclic Service

4WEQ-1075 Temperature Swing Adsorber Pressure Vessels (Nozzle Screen Type)

4WEQ-1077 Temperature Swing Adsorber Pressure Vessels (Basket Screen Type)

4WEQ-6804 Painting and Corrosion Protection of New Construction for Design Temperatures to 649°C (1200°F)

4WPI-SW70002 Process Clean (Class B) Inspection and Acceptance Requirements

4WPI-MWFG08 Material Purchase Specification for Spiral-Wound Gasket Low Stress Type (304/304/304/Graphite)

Q5000 PROJ 1100 Air Products Quality Control Plan – Pressure Vessels

VDR Set Vendor Document Requirements

3.2 Air Products Purchasing Documents

Purchase Order (PO) and its attachments

Project Equipment Specification (PES)

3.3 American Society of Mechanical Engineers (ASME)

B16.47 Large Diameter Steel Flanges

B16.5 Pipe Flanges and Flanged Fittings

BPVC, Section VIII Rules for Construction of Pressure Vessels, Division 1

BPVC, Section VIII Rules for Construction of Pressure Vessels, Division 2

3.4 British Standards Institute (BSI)

PD 5500 Unfired Fusion Welded Pressure Vessels

EN13445 Unfired Pressure Vessels

3.5 Carl Heymanns Velag KG (Publisher of the German Pressure Vessel Rules)

Technische Regeln Druckbehälter (TRB, Technical Rules for Pressure Vessels) AD-Merkblätter

3.6 ASME Proceedings 1972

“Stresses at the Cylinder/head Weld Seam (ref ‘Elastic Stresses in Pressure Vessel Heads’)” by Kraus

3.7 Engineering Sciences Data Unit (ESDU)

67017 Elastic Stresses in the Torispherical Head of a Pressure Vessel of Uniform Thickness

EXTENT OF SUPPLY

4.1 The vessel supplier is responsible for providing all materials, plant, and labor associated with the mechanical design, supply of fully checked manufacturing drawings and calculations, manufacture, testing, cleaning, internal coating*, painting, installation of internals, sliding saddle base plate**, low friction pads**, gas sampling probes, internal floating screens, and packing for transport of the vessels in strict accordance with the Air Products PES and the PO.

*where applicable, **for horizontal vessels

4.2 Unless stated otherwise in the PES, Air Products shall be responsible for the design of the vessel to meet the cyclic loadings detailed in Section 5.2.

4.3 Internal V-wire basket screens or nozzle screens will be supplied free issue by Air Products. The vessel scope of supply includes the fitting of these screens and all materials associated with the fitting.

4.4 Vessel fill material (that is, adsorbent and ceramic balls) and internal after-filters will be supplied and field-installed by others.

PRESSURE VESSEL

5.1 General

5.1.1 TSA vessels will be used in fatigue service; consequently this specification, 4WEQ-1010, and the Air Products specification for the particular type of TSA vessel impose requirements that are additional to the requirements of the design code and regulations. Compliance with Air Products specifications do not exempt the vessel supplier from complying with the requirements of the design code or any local regulations.

5.1.2 The TSA vessel design and fabrication code shall be ASME VIII Division 1, latest edition, including all addenda at date of the order. The vessels shall be ‘U’ stamped and assigned a National Board registration number.

5.1.3 Other codes, such as EN13445, PD5500, AD-Merkblätter or ASME VIII without a ‘U’ stamp may be used by the vessel supplier, if it is agreed with Air Products before placement of the purchase order and specified in the PES. The vessels shall be designed, constructed, inspected, and tested in strict accordance with the agreed design code. In such cases independent manufacturing inspection and design approval is required.

5.1.4 While this specification, the Air Products setting plan and PES provide guidance and/or minimum requirements for cyclic service, the vessel supplier has sole responsibility for ensuring the design is fit for purpose. The vessel supplier is responsible for any details not covered by the Air Products purchase documents. Such details include weld seam locations and weld detail specifics.

5.1.5 The vessel shall comply with the PES. The vessel will normally be situated outdoors mounted on a concrete pad or plinth furnished by others. It shall be suitable for outdoor service.

5.1.6 The vessel shall, as a minimum, be designed for the following conditions:

Adsorption—at the system design pressure and the adsorption inlet temperature (or 50°C if this is higher).
Reactivation—at the maximum reactivation pressure and temperature.
Bake out—at the maximum bake-out pressure and temperature. (Note there is not always a bake out case.)
Upset—if the vessel is accidentally pressurized to the adsorption maximum pressure at the reactivation or bake-out design temperature (if bake-out case exists) in the corroded condition, the pressure stress in the vessel shall not exceed 90% of yield stress (at reactivation or bake-out temperature as appropriate).

In cases where the design code allowable stresses do not vary significantly with temperature, it may be possible to simplify the design calculations and consider only a single case of adsorption maximum pressure at reactivation/bake-out design temperature in the corroded condition, with the pressure stress in the vessel limited to the code design stress at reactivation/bake-out temperature. Where the design code allowable stresses do vary significantly with temperature, the design cases shall be considered separately.

5.1.7 The vessel and its supporting structure shall be suitable for on-site hydrostatic strength tests.

5.1.8 Unless specified otherwise in the PES, the vessel design life shall be 15 years for ‘standard life’; 25 years for ‘extended life’. The requirement for ‘standard life’ or ‘extended life’ will be specified in PES.

5.1.9 Vessels shall have heads that are, or approximate to a 2:1 ellipse. For torispherical heads, the vessel supplier shall specify the spherical and knuckle radius during the bid stage.

5.1.10 Unless otherwise agreed, the pressure parts of the vessel shall be constructed of the materials listed in Section 6 of Air Products specification 4WEQ-1010.

5.1.11 Corrosion allowance for carbon steel shall be as required by the applicable Air Products specification for the particular type of TSA vessel or PES. No corrosion allowance is required for stainless steel and corrosion-resistant alloys.

5.1.12 The vessel will be insulated externally by others. Insulation supports shall be provided as follows:

Horizontal vessels—no insulation supports required.
Vertical vessels—insulation supports are required per 4WEQ-1020, except that no ‘nuts’ are required on the bottom heads of skirt-supported vessels (as the bottom head of vessels with skirts will not be insulated).

5.1.13 Unless specified otherwise, manways shall not be less than DN600 (24 NPS) with an internal diameter not less than 580 mm.

5.1.14 When adsorber bed temperature sensors are shown on the TSA setting plan, the sensor and thermowell will be supplied by Air Products and fitted at site by others. The thermowell will be an ANSI flanged type. The vessel shall be supplied with RFLWN nozzles (DN40, NPS 1 1/2 minimum) to accommodate these thermowells (actual size and rating will be shown on the setting plan).

5.1.15 Nozzles for adsorber bed sampling probes shall be DN40, NPS 1 1/2 RFLWN (rating will be shown on the setting plan).

5.1.16 All process nozzles shall be weld-neck type, but manway and absorbent fill nozzle flanges may be slip-on type. Flange face finish shall be 3.2–6.3 mm Ra (that is, “stock” finish); gaskets shall be to 4WPI-MWFG08 (Low Stress Type – 304/304/304/Graphite) – alternatives may be accepted if demonstrated to be equivalent. When specified on the setting plan, the air inlet nozzle may have a butt-weld termination. All other nozzles shall always be flanged.

5.1.17 Unless specified otherwise, vertical vessels (having either skirt or leg supports) shall have a flanged inlet spool as shown in Figure 3.

5.1.18 For vertical vessels having skirts, when the inlet nozzle/spool is DN200 (NPS 8) or larger, the spool shall be capable of being withdrawn inside the skirt. In this case, the spool shall be provided with support stools, guide rails, and pull lift lugs as shown in Figure 3.

5.1.19 For vertical vessels having skirts, where the inlet nozzle/spool is less than DN200 (NPS 8), it is assumed the inlet spool can be rotated and man-handled to the floor, in which case the spool does not need to be capable of being withdrawn into the skirt.

5.1.20 In all cases, there shall be an opening in the vessel skirt, large enough in diameter to pass a new inlet nozzle flange gasket through without damage.

5.1.21 TSA vessels are normally supplied in pairs. The two vessels are identical except as indicated on the vessel setting plans or advised during the drawing review stage.

5.1.22 The vessel shall have lifting lugs (see Figure 5) or trunnions (see Figure 6) as specified in the PES or setting plan, suitable for lifting the vessels, and in the case of vertical vessels also for rotating from the horizontal to the vertical. Lifting lugs shall not be attached to the saddles of horizontal vessels, either lugs on the top of the vessel or trunnions shall be provided.

5.1.23 A gas wall baffle is usually required (see Figure 2). Its location will be shown on the setting plan, given in the PES or confirmed at drawing review stage.

5.1.24 Unless shown otherwise on the vessel setting plan, when horizontal vessels have single air inlet and single air outlet nozzles, these nozzles shall be located midway between tan lines. When horizontal vessels have two air inlet and two air outlet nozzles (dual nozzles), these nozzles shall be located at 25% and 75% of the Tan-Tan length.

5.1.25 Horizontal vessels shall be provided with DN300 adsorbent fill nozzles.

For vessels with single air outlet nozzles, unless specified otherwise, two fill nozzles shall be provided, placed at 25% and 75% of the Tan-Tan length.

For vessels with dual air outlet nozzles, unless specified otherwise, three fill nozzles shall be provided, placed at one-sixth, one-half, and five-sixths of the Tan-Tan length.

Adsorbent fill nozzles shall be provided with blind flanges, gaskets, studs, nuts and washers and lifting handle(s).

5.1.26 Horizontal vessels shall be provided with manways above the adsorbent bed (located near to adsorbent fill nozzles) as follows:

Two manways for vessels with single air outlet nozzles – one shall be located either side of the central air outlet nozzle.

Three manways for vessels with dual air outlet nozzles – one shall be located ‘outboard’ of each air outlet nozzle, and one shall be located close to the vessel’s midpoint.

Manways located above the bed shall be provided with blind flanges, gaskets, studs, nuts and washers and davits.

5.1.27 Horizontal vessels shall be provided with manways below the adsorbent bed as follows:

Two manways for vessels with single air inlet nozzles – one shall be located either side of the central air inlet nozzle.

Three manways for vessels with dual air inlet nozzles – one shall be located ‘outboard’ of each air inlet nozzle, approximately midway between nozzle and vessel head, and one shall be located at the vessel’s midpoint.

Manways located below the adsorbent bed shall be provided with blind flanges, gaskets, studs, nuts and washers and with hinges as shown in Figure 7 (supplier is responsible for detail mechanical design of hinges) and shall be fitted with DN15 low point drains (plugged).

5.1.28 Horizontal vessels shall be provided with DN50 drain nozzles as follows:

Two drain nozzles are required on vessels with single outlet nozzles, located close to the vessel heads.

Three drain nozzles are required on vessels with dual air outlet nozzles, one shall be located close to each vessel head, and one shall be located at the vessel’s midpoint.

5.1.29 TSA vessels shall be hydrostatically pressure tested. They shall be drained and dried immediately after the pressure test to minimize rusting. A small amount of rust bloom (per 4WPI-SW70002) is acceptable. If agreement is given to pneumatically pressure test, the additional requirements of 4WEQ-1011 shall be applied.

5.1.30 Unless otherwise specified in the PES horizontal vessels shall be supplied with a PTFE-faced slider plate for the sliding saddle and a dummy spacer plate for the fixed saddle (see Figure 9 for details). The local stresses imposed on the vessel arising from frictional drag on the saddle plates shall be analyzed for both the bake-out and normal regeneration cases. The regeneration case shall be considered cyclic.

5.1.31 The sliding saddle shall be provided with slotted holes that will accommodate the total expected thermal expansion and contraction of the vessel between saddle centerlines. The expansion shall be based on a 355°C increase (these temperature differences include a margin to allow for differing assembly temperatures in the range of 0-30°C). The coefficient of expansion of carbon steel shall be taken as 13.3×10^-6 mm/mm/°C. The contraction shall be assumed to be the same as the expansion, so that the ‘assembly’ condition will have the holding down bolt centralized in the slot. The bolt hole clearances required by 4WEQ-1010 shall be applied in addition (these are to allow for foundation tolerances).

5.1.32 Reinforcing pads fitted to the inside of the vessel shall be fully welded to the vessel wall and shall not have vent holes left open, to prevent water getting behind the pads.

5.2 Design for Fatigue

5.2.1 The vessel will be subject to temperature and pressure cycling. There will also be cyclic loads applied to the vessel via the inlet and outlet nozzles.

5.2.2 A typical TSA vessel operating cycle includes the following:

Vessel at adsorption operating temperature and pressure.
Vessel depressurized to reactivation pressure.
Gas at reactivation temperature and pressure flows through the vessel.
In-flowing gas temperature reduces to adsorption operating temperature (until vessel and contents are at adsorption operating temperature).
Vessel pressure rises to adsorption operating pressure.

5.2.3 The operating temperature and pressure range and cycle periods will be specified by Air Products in the PES. The cyclic nozzle loads will normally be supplied by Air Products after the order has been placed.

5.2.4 The fatigue analysis shall cover all of the following areas as a minimum:

Longitudinal weld seam misalignment, peaking, and shell ovality.
Mismatch of circumferential weld seams.
All nozzle to shell/head joints.
Welded joints passing through the knuckle region of heads. The stress range in the knuckle of a perfect head can be established using ESDU Data Sheet 67017.
Stresses at the cylinder/head weld seam (ref ‘Elastic Stresses in Pressure Vessel Heads’ – Kraus – ASME Proceedings 1972, the stress increase is always less than 15%, so is generally less significant than the effect of ovality).
Area in vicinity of vessel support attachments (for horizontal vessels include cyclic drag forces on saddles).
Attachments to shell such as pipe clips, internals supports and baffles, equipment supports, and lifting lugs/trunnions.
Cyclic nozzle loads.

Note 1: The internal filter is considered to act as a thermal sleeve and, as such, a thermal fatigue analysis of this nozzle-to-shell junction is not required.

Note 2: For TSAs with nozzle type screens, there will be cyclic loadings on the vessel because of the reversing pressure drop across the bed support plate. For details, see 4WEQ‑1075.

The calculation of cyclic stresses shall preferably use the methods given in PD5500 Annex C section C.3.4.6 (and references to Annex G). Other approaches shall be subject to Air Products approval. The sources of all stress concentration factors (SCFs) used in the analysis shall be quoted.

5.2.5 The assessment of the cyclic stresses shall be made to one of the following:

PD5500 Annex C—Note: When using this approach, the level of NDE for welds must comply with the requirements of the comments in Table C.2 (that is, C.3.4.2 and Table C.4).

ASME VIII Div 2 AD-160

5.2.6 Unless specified otherwise in the PES, the fatigue analysis shall be performed on the corroded vessel thickness.

5.2.7 All attachments and nozzles shall be separated by a minimum distance equal to:

from each other or from the knuckle region of heads and main seam welds by , where (R) is the vessel inside radius and (t) the cylinder or head thickness, as applicable.

Note: When this is impractical, and these distances are reduced, the fatigue analysis shall consider the effect of the combined stress raisers.

Note: The pads and leg supports of inlet nozzle impingement plates shall be given particular consideration. Their legs may require sloping from the vertical to achieve the necessary separation distance.

5.2.8 Vessel thicknesses specified on the setting plan are the minimum required AS-BUILT (including corrosion allowance) for fatigue purposes. The requirements of the selected design code for the static design conditions may be in excess of these minimum thicknesses.

5.3 Construction for Fatigue

5.3.1 In addition to the requirements of the fatigue section of the design code, the following requirements apply:

5.3.2 All welds (both pressure-containing and welds to pressure parts) shall be of smooth profile. Smooth means the contour of the weld must merge smoothly into the base metal with no sharp change in metal surface.

5.3.3 Fillet welds shall be finished to give a smooth transition with the parent plate. Fillet welds that have a bulbous/convex contour or make an abrupt angle with either part being joined are not acceptable.

5.3.4 Welds shall be free of undercut, overlap, and abrupt ridges or valleys. Weld ripples shall have a regular, uniform appearance. The quality/finish of pressure part welds and of all attachment welds to pressure parts shall be suitable for examination by magnetic particle inspection (MPI).

5.3.5 Welds may be left in the as-welded condition if all of the above requirements are met. Welds not meeting all of these requirements shall be dressed and/or rewelded. Care must be taken not to gouge the base metal.

5.3.6 The minimum level of NDE shall be consistent with the fatigue curves and weld fatigue strength reduction factors used in the fatigue design*, but shall not be less than the following:

‘Spot’ radiography of longitudinal weld seams.
100% MPI crack detection of all longitudinal, circumferential weld seams.
100% MPI crack detection of all nozzle attachment welds.
100% MPI crack detection of all non-pressure attachment welds to the vessel.

*Note: PD5500 requires 100% volumetric NDE to be applied to butt weld classes D, E, and F.

5.3.7 Welds in non-pressure components that are then welded to the vessel shall be full penetration double-sided welds and shall be completed before completion of the attachment weld to the vessel. The joints shall also be subject to 100% MPI crack detection; see Figure 2. There shall be no joints in the wall baffle in the knuckle region of the dished heads.

5.3.8 Support skirt attachment welds shall be as shown in Figure 4.

5.3.9 As a minimum, the inlet and outlet nozzles shall have a reinforcing area equal to a ‘full-reinforcement’ set-on pad (that is, area equal to a pad having outside diameter equal to twice the nozzle outside diameter and with a thickness equal to the shell or head thickness). An equivalent insert plate (“dollar” plate) or thicker shell strake is preferable to a reinforcing pad.

5.3.10 Nozzle braces are not permitted.

5.3.11 The nameplate bracket shall be attached to the vessel support and not to a pressure part.

5.3.12 Unless otherwise agreed, or if the pressure vessel fabrication code requires tighter tolerances, the longitudinal weld seam profile and vessel shape imperfection tolerances shall not exceed the following (based on shell thickness, t):

1% ovality (the difference between maximum and minimum diameters at any section, expressed as a percentage of the nominal diameter). No relaxation of this limit is permitted at nozzle locations.

3 mm weld seam peaking of longitudinal seams (the deviation of the shell surface next to the weld—measured in a radial direction from the perfect cylinder) in shells with 6< t<9 mm, for t ≥ 9 mm allowable weld seam peaking = t/3.

Smaller of t/10 and 3 mm centre-line misalignment of plates at longitudinal weld seams.

t/10 +1 mm centre-line misalignment of plates at circumferential weld seams.

The longitudinal weld seam shall be a double sided weld with the overfill angle not limited (Class ‘E’ weld to PD5500 Appendix C).

Note: These tolerances are intended to be minimum’s and may be reduced on a project basis to achieve the specified vessel design life (see paragraph 5.1.8). Reduced tolerances will be specified in the PES or on the setting plan.

Other tolerances shall be as per code and 4WEQ-1010.

ADSORBER BED SUPPORT SCREENS AND OTHER INTERNALS

6.1 General

6.1.1 The extent of internals to be fitted, together with dimensional data, shall be as detailed in the PES and its attachments.

6.1.2 Detail drawings of the individual internals will be supplied by Air Products.

6.1.3 TSA vessels are loaded with small diameter adsorbent beads. To prevent leakage of these beads, there shall be no gaps in the support system that are wider than the slot width of the bed support screens (0.7 mm unless otherwise specified).

6.1.4 Before delivery to the vessel supplier, the Air Products-supplied internals will have been inspected and trial assembled (when appropriate) by the internals manufacturer and inspected by Air Products. However, it is the vessel supplier’s responsibility to report any unacceptable gaps in the screens; any remedial action requires Air Products’ approval.

6.1.5 All bolting inside the vessel shall be austenitic stainless steel with the nuts being a different grade to the bolting/studding (to avoid galling). All bolting shall be M16 (or 5/8″ UNC) minimum. All internal bolting shall be provided with heavy stainless steel washers.

6.2 Floating Screen

6.2.1 The vessel supplier shall supply floating screens as indicated in the PES.

6.2.2 The screen material specification shall be as follows:

Mesh Size 20 (plain square weave)

Wire Size 0.4 mm alternatively 0.355 mm

Opening Size 0.86 mm alternatively 0.914 mm

Open Area 46% alternatively 52%

Material 304 Stainless Steel

6.2.3 Floating screens may be supplied in sections. Screen material shall be supplied such that there is sufficient material for sections to overlap by at least 150 mm and for the screen to be folded up the vessel wall by 50 mm. The supplier shall provide a layout drawing identifying the floating screen section arrangement and have clear markings to indicate the installation sequence.

6.2.4 Each section of screen shall be rolled to form a cylinder that can be passed through a 580 mm ID manway. The maximum weight of each roll shall be 35 kg. They shall be shipped to site inside the vessels and securely located to resist the transport forces.

The vessel supplier shall supply sufficient 0.5 mm diameter 304 stainless steel wire to sew together screen joints.

The screens shall be free from foreign matter such as particles, scale, oil, grease, and paint.

6.3 Adsorber Bed Sampling Probes

6.3.1 The vessel supplier shall supply any sampling probes specified in the PES or its attachments. Probe elevations and orientations will be advised/confirmed at the drawing review stage or indicated on the setting plan.

6.3.2 Sampling probes shall be manufactured from 300 series stainless steel and be as shown in Figure 1.

6.3.3 Sampling probes shall be supplied loose (they shall be shipped to site inside the vessels and securely located to resist the transport forces) and the ½” NPT hole in the nozzle blind flange shall be closed with a 3000# plug.

6.4 Internal After-filters

6.4.1 The internal after-filters will be supplied by Air Products and installed at site. However, the vessel supplier must ensure that the effective outlet nozzle outstand as well as the actual nozzle outstand is clearly shown on the general assembly drawing. This is best achieved by including a detail similar to detail ‘A’ of Figure 8 on the assembly drawing.

6.4.2 The effective nozzle outstand = the actual nozzle outstand + the filter flange thickness + one gasket thickness.

6.4.3 The gaskets shown in Figure 8 of this specification, (to 4WPI-MWFG08) are 3 mm thick (when fully compressed). Unless otherwise agreed, the filter flange thickness will be as follows:

	Nominal Nozzle size	Minimum Flange Thickness, T
	<350 mm (14 inch)	6 mm (1/4 inch)
	350–750 mm (14–30 inch)	10 mm (3/8 inch)
	>750 mm (30 inch)	25 mm (1 inch)

6.4.4 The outlet nozzle inside diameter must be closely controlled to ensure the internal after-filter can be fitted (see Figure 8 for tolerance).

CLEANING

7.1 The vessel shall be shot blasted and cleaned internally to 4WPI-SW70002. Suitable measures shall be taken to ensure the specified standard of cleanliness is maintained until delivery to site.

7.2 Unless specified otherwise in the PES, with reference to 4WEQ-1010, paragraph 16.1.1, ‘standard shipping’ is required with no internal shipping purge per 4WPI-SW70002 required.

PAINTING OF EXTERNAL SURFACES

8.1 After completion of all nondestructive testing and pressure testing, the vessel shall be painted externally to 4WEQ-6804 Table 3, paint code ‘TSA’ or as described in the PES. Uninsulated surfaces shall have a final color of Window Grey [RAL 7040].

Note: If alternative paint systems are proposed, the system shall be suitable for temperature cycling service, the reactivation/bake out design temperature of the vessel, and cure at room temperature in the fabricator’s shops.

INSPECTION AND QUALITY PLAN

9.1 The vessel supplier is responsible for arranging interstage and final inspection by the Independent Inspection Organization. Air Products will inspect according to the Quality Control Plan (QCP) issued with the order. The following inspection activities will be performed by the Air Products inspector during the visits noted on the QCP. These are in addition to the requirements of the design code/inspection organization:

Checks required by the specification applicable to the type of internal screen.
Check dimensions and specification of floating screens.
Check dimensions of gas sampling probes and positions of nozzles.
Check outlet nozzle internal dimensions are within required tolerances (to ensure after filter will fit).

CALCULATIONS

10.1 The Mechanical Design Calculations shall include the following:

Calculations for all pressure parts.

Weight calculations.

Calculation of support loads (that is, caused by dead weight, wind, seismic, thermal expansion, and any other specified imposed loads).

Structural calculations for supports and support-to-shell attachment.

Holding down bolt sizing.

Calculations for lifting lugs and attachment welds.

Structural calculations for internals and attachment welds.

Fatigue calculations (when in the vessel suppliers scope – see paragraph 4.2).

Note: Allowable stresses shall be per 4WEQ-1010 (Section 5.6.8).

INFORMATION TO BE SUPPLIED WITH THE BID

11.1 The following information shall be supplied with the vessel supplier’s bid:

Documentation—The vessel supplier shall complete the Suppliers Documentation Schedule (SDS) attached to the inquiry.

A bar chart or similar document detailing design, drawing, materials procurement, and manufacturing schedule. The chart shall show the time to perform each critical element of work and shall also include all of the following:

– Latest dates for document approval by Air Products.

– The period after order date when internals drawings are required.

– The date when internals are required for installation.

Confirmation of full compliance with Air Products specifications or details of any deviation.

Nominal thicknesses of the vessel heads, shell, pads, and process nozzles.

The spherical and knuckle radii of the heads to be used.

Material list including heads, shell, and other main materials.

Empty weight of vessel.

Price per kilogram for additional clips and reinforcing pads.

Additional information specified in the Air Products specification for the particular type of TSA (4WEQ-1075 or 4WEQ-1077 as appropriate).

SPARE PARTS

12.1 See 4WEQ-1010, Section 17.

Figure 1

Sampling Probes