1. Scope – The Engineering shall perform the work as described in this specification on all pressure vessels, storage tanks, heat exchangers, vaporizers, and vessels internals within their scope. The specific work will be described in the contract scope.
The EC’s work may include one or more of the following functions:
- Basic Design – consisting of production and issue of data sheet, mechanical specification, and/or outline drawing (setting plan).
- Detailed Design – consisting of production, or for purchased items, the review of detailed fabrication drawings and design calculations. These calculations shall include pressure vessel code, wind, seismic, and nozzle loads analyses as appropriate. In addition, the review of all items to ensure compliance with Air Products’ specifications and standards.
- Procurement – consisting of enquiry and purchase requisitions, technical bid reviews/tabulations, and supplier follow-up.
2. Codes, Standards, and Specifications
2.1 General
The following are the design codes, Company engineering standards, specifications, QC Plans, and VDR documentation that the ENGINEERING CONTRACTOR shall use to design and procure vessels and heat exchangers as required in the contract scope.
2.2 Design Codes
The following design codes shall be used:
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ASME VIII, Div.1 |
ASME Boiler and Pressure Vessel Code Section VIII, Div.1 |
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TEMA |
Tubular Heat Exchanger Manufacturers Association |
When a local or country code takes precedence, the ENGINEERING CONTRACTOR shall advise Air Products.
2.3 Standards
The Company engineering standards and design guides relating to pressure vessels, heat exchangers, and related items will be listed in the contract scope appendix.
2.4 Specifications
The Company specifications relating to pressure vessels, heat exchangers, and related items will be listed in the contract scope appendix.
2.5 Quality Control (QC) Plans
Company QC Plans for the various pieces of equipment (vessels, exchangers, etc.) will be listed in the contract scope appendix. These QC Plans shall be included in any ENGINEERING CONTRACTOR procurement packages for this equipment as appropriate.
2.6 Vendor Data Requirements (VDR) Documentation
Company VDR documentation is required for the equipment. The particular VDR sets (ID/Name) will be listed in the contract scope appendix.
3. Company Deliverables to the Engineering Contractor
3.1 General
This paragraph provides a description of the drawings and documents that will be issued by Company to the ENGINEERING CONTRACTOR as the basis for the detailed design work to be performed by the EC. The exact scope for each piece of equipment shall be detailed in the contract scope.
3.2 Equipment Setting Plan (Outline Drawing)
This setting plan defines the vessel arrangement, minimum thicknesses of vessels, and details of vessel internals.
3.3 Loading/Filling Procedure (when relevant)
The loading/filling procedure (such as a TSA vessel adsorbent filling procedure) is a description and listing of the requirements that the installation contractor shall follow during filling. The ENGINEERING CONTRACTOR may need to complete this document with access information, exact dimensions or internal details, etc. according to the final design of the relevant vessels.
3.4 Process Data Sheet
Company will provide a process data sheet for equipment to relate information such as pressure, temperature, etc. about the item as required. See the contract scope appendix for the listing of these data sheets.
3.5 Company can provide examples of these documents if needed. If provided, they will be listed in the contract scope appendix.
4. Materials Provided by Company
- The contract scope will provide information about equipment or parts of equipment that will be designed and/or procured by Company for inclusion in equipment that is part of the EC’s scope of work.
- Company may supply a complete piece of equipment or only part of it, such as the internals for a vessel. For example, Company may supply some of the following items:
- Internal filter elements.
- Nozzle screens.
- Adsorbent material.
- Dump packing.
- Bed support for dump packing.
- Hold down grid for dump packing.
- Liquid distributor.
- Demister elements.
- Support beams, support plates.
- Intermediate mesh screens.
- All items not listed in the contract scope as being designed and/or supplied by Company are in the ENGINEERING CONTRACTOR scope of supply.
- Supplier drawings will be provided to the ENGINEERING CONTRACTOR for supplied equipment as soon as they are available.
5. Deliverables from the Engineering Contractor
- This section provides a description of the drawings and documents that shall be produced by the ENGINEERING CONTRACTOR and issued to Company as the detailed design work/procurement process is performed and as required in the contract scope for the pressure vessels and heat exchangers.
- The ENGINEERING CONTRACTOR shall produce requisition packages for the equipment.
- The ENGINEERING CONTRACTOR shall obtain competitive bids for the equipment, review the bids against Air Products’ requirements, and produce technical and commercial bid tabulations. These packages and bid tabulations shall be submitted to Company for review and approval before purchase of the equipment.
- After Company approves the purchase package/bid tabulation, the ENGINEERING CONTRACTOR shall procure the equipment when required by the contract scope.
- The ENGINEERING CONTRACTOR is responsible for reviewing supplier documentation against Company requirements to ensure compliance. Supplier drawings for the equipment shall be submitted to Company for review and approval.
- The ENGINEERING CONTRACTOR shall review the equipment final documentation packages to ensure compliance with Air Products’ requirements.
- Company may provide examples of the documentation (specifications, drawings, etc.) that the ENGINEERING CONTRACTOR is to provide if needed by the ENGINEERING CONTRACTOR to better understand Air Products’ requirements. These example deliverables will be listed in the contract scope appendix. The ENGINEERING CONTRACTOR may use alternative formats for the documentation that better fit the EC’s work process as long as equivalent information is presented.
6. Company Nozzle Loading Assessment
6.1 General
- The ENGINEERING CONTRACTOR is responsible for analyzing and verifying that nozzle loads on vessels and exchangers for all equipment included in the EC’s specific scope of work are acceptable.
- All significant nozzle loadings on vessels and exchangers shall be analyzed. The most unfavorable combination of load and moment “signs” shall be considered regardless of load and moment sign produced by the attached piping. Radial load is to be taken first as acting radially outwards with internal pressure applied; then the radial load is to be considered as acting radially inwards with null (i.e., zero) pressure, or vacuum, as appropriate depending upon the specific scope of work.
6.2 Analysis Methods
- External loadings on nozzles shall be assessed using recognized, published methods. Extrapolation outside of the defined scope/range of application of the method used is not permitted unless technically justified. The assessment shall include pressure stresses. Pressure stresses around nozzles shall include the stress-raising effect of the opening’s geometry.
- All nozzle load analysis assessments (calculations, etc.) shall be submitted to Company for review and approval.
- The ENGINEERING CONTRACTOR is responsible to make any design modifications to the vessels or piping necessary to ensure that nozzle load values are acceptable.