• Document: STANDARD SPECIFICATION FOR STORAGE TANKS
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STANDARD SPECIFICATION FOR STORAGE TANKS CONTENTS 1. SCOPE 2. REFERENCE 3. SELECTION OF MATERIALS 4. DRAWINGS AND DOCUMENTS 5. FABRICATION AND ERECTION 6. APPURTENANCES 7. INSPECTION AND TESTING 8. CALIBRATION 9. PAINTING 10. TOLERANCES 11. IDENTIFICATION,PACKING,AND TRANSPORTATION. 12. GUARANTEE SCOPE This specification covers the general requirements for design, selection of materials, fabrication, erection, inspection, testing, fitting of other attachments and appurtenances, cleaning, calibration and painting of storage tanks and is intended to supplement the minimum requirements of the applicable codes. Engineering drawings take precedence over specifications / standards. REFERENCE 1. Design Codes The following codes in their latest edition shall form the basis for design, fabrication, inspection, testing and acceptance of storage tanks. 1 American Petroleum Institute Standard API 650 with applicable indexes 2 ASME Boiler and Pressure Vessel Code Section IX. 3 Indian Boiler Regulation – IBR (wherever applicable) 2. Material codes Material to be used shall conform to: 1. ASME Boiler and Pressure Vessel Code Section II 2. Indian Standard Specification. Special specification of equivalent grade can be used only after obtaining written approval from 3. Regulations National laws and regulations together with local by-laws for the country of state wherever the tanks are to be erected must be complied with. SELECTION OF MATERIALS 4.1 All materials shall be as per applicable codes / drawings / standards 4.2 Plate material conforming to IS: 2062 shall be used upto 20 mm thickness. 4.3 Manhole necks, nozzle necks 350 mm NB and above may be fabricated from same plate material as used for shell. Plate material used for ring flanges shall have minimum UTS of 4200 kg/cm2. For flange thickness over 38 mm, plate material shall be boiler quality, fine-grained, killed, and normalized and impact tested as per the requirements of API Standard 650. Heating coil pipes shall be of seamless quality. All clips and attachments shall be fabricated from carbon steel plates of weldable quality. Hand rails on stairway and tank top shall conform to IS: 2062 . Platforms, spiral stairways and gangways shall have gratings fabricated from flats. Gaskets for manholes and nozzles fitted with blind flanges shall conform to IS: 2712. Thickness of gasket shall be 1.5 mm for nozzles upto 450 mm NB and 3.0 mm for nozzles above 450 mm NB. Bolts and nuts for all nozzles fitted with blind flanges shall conform to IS: 1367 or ASTM A-307 Gr. B or A-193. Bolts and nuts for all structural shall conform to IS: 1363. Floating roof pipe supports and pipe sleeves shall be of carbon steel conforming to A-106/A-53 (seamless) IS: 1978 or equivalent. Following classifications of electrodes are recommended for welding. However, minimum requirements of applicable codes and appendices should be adhered to: 1. Low hydrogen electrodes shall be used for all manual metal-arc welds of shell courses having a thickness of 12 mm or more and for attachment of shell course to bottom or annular plates. 2. For all other welding High cellulose / rutile type electrodes as per the AWS classification SFA 5.1 are acceptable. Based on above, fabricator shall furnish brand names of welding consumables to Engineer-in-Charge for approval. DRAWINGS AND DOCUMENTS 1 All individual tank drawings with design data and material specifications are attached with this document for tendering / quotation. Final drawing with revisions, if any, shall be issued after award of contract / purchase order. 2 Design Calculations Fabricator shall submit the details design calculation for floating roof and wherever called for in the tender document for HPCL review / approval. 3 Contractor shall prepare all fabrication drawings based on the drawings issued on award of contract / purchase order and shall include the following : (a) General arrangement drawing (b) All general information and special instructions provided in drawings. (c) Tolerances (d) Specification and brand names of electrodes to be used. (e) Nozzle orientation (f) Development and details of shell, roof, floating roof and bottom. (g) Final plate cutting layout (h) Complete bill of material indicating scope of supply by owner/ contractor. (i) Roof support structure. (j) Stairways, platforms and handrails. (k) Weld seams, weld joints, and weld sizes. (l) Reinforcements. (m) Insulation supports for shell and roof. (n) Bracket and pipe supports, platforms, ladder / stair case, earthing connection etc. (o) Appurtenances, foam and cooling water system. (p) Fixtures for internals (q) Heating coils (r) Roof drain. In case the contractor intends to make some modifications for

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