TECHNICAL SPECIFICATIONS FOR STEEL PLATES

Transcription

1 TECHNICAL SPECIFICATIONS FOR STEEL PLATES

2 1.0 SCOPE: HINDUSTAN PETROLEUM CORPORATION LTD., GRESHAM HOUSE This specification covers requirement for Carbon Steel Plates of Structural Quality as per IS: 2062 Gr. E 250- A (as a minimum requirement) intended primarily for welded storage tanks for petroleum products. Plates shall conform to IS: 2062 Grade E 250- A 2006 as a minimum requirement and to this technical specification. Reference is made to IS: for all abbreviations used in this document. Reference shall be made to IS: wherever applicable. Sampling & other details for all the tests required by this specifications shall be in accordance with IS: GENERAL: 2.1 STEEL PLATES MANUFACTURED BY STEEL MAKERS ONLY WILL BE ACCEPTED.PLATES ROLLED FROM SLABS THAT ARE SOURCED FROM THIRD PARTIES WILL NOT BE ACCEPTED. 2.2 Plates supplied to this specification shall conform to IS: with additional requirement mentioned herein. 2.3 The plates shall be free from surface flaws, laminations and any other harmful defects.

3 2.4 The tolerance for plate thickness, width and length shall be ZERO in negative side and the tolerance for plate thickness, width and length on the positive side shall be in line with the tolerance limit(s) specified in the latest issue of IS : 2062 in accordance with IS 1852 latest edition. In the event the bidder offers plates of lesser thickness and width for any of the tendered items, the offer(s) of such item(s) shall be liable for rejection. 2.5 Final rolling shall be lengthwise with desired width. 2.6 The plates shall be free from injuries and defects and shall have workmanlike finish. Reconditioning / repair of plates by welding is not permitted. 2.7 Invoicing should be based on actual weight of the plates supplied and it should be within the maximum positive tolerance allowed for steel plate in IS 1852 latest edition. Weight beyond permissible positive tolerance in accordance with IS:1852 latest edition shall not be paid. 2.8 Plates shall comply with Chemical composition as per table 1 of IS: The manufacturer shall comply with the following requirements; perform and furnish Test reports for the following: Ladle analysis shall be carried 2 samples/heat of 100 MT 1 sample/heat of 50 MT

4 Product analysis shall be carried 2 samples/heat of 100 MT 1 sample/heat of 50 MT 2.9 Plates shall have following Mechanical Properties: Bidders to note that HPCL requirement is E 250 A quality only. However, HPCL shall accept plates of E- 250-B quality also subject to the plates conforming to all the specifications of E-250-B quality as per IS: and accordingly the TPI agency shall carry out the inspection of the plates. For full details please refer Table 2 of IS: APPLICABLE FOR E 250 A OR B ( FOR LESS THAN 20MM THICKNESS) Yield Strength : 250 MPa minimum Tensile Strength : 410 MPa minimum Elongation Bend Test Charpy Test : 23% min. : 3t (min) for E-250 Gr. A & 2t (min) for E-250 Gr. B : applicable for E-250-B quality & thickness of 12mm & above The manufacturer shall possess valid BIS certification licence for IS: Copy of the valid licence shall be submitted to HPCL. Each plate in each pack shall carry Manufacturer s Name/Logo and BIS certification / Licence Number.

5 3.0 SUPPLEMANTARY TECHNICAL REQUIREMENTS : 3.1 The manufacturer shall perform all tests required for ascertaining Chemical Composition and Mechanical Properties in accordance with IS: and furnish Certificates of same. Additionally inspection reports for Dimensional checks and Surface conditions shall be furnished by the manufacturer confirming that the plates are dimensionally acceptable and free from surface flaws, laminations and any other harmful defects. 3.2 The material has to be inspected by any one of the following third party inspection agencies: 1. CEIL 2. LLOYD3. DNV 4. BV Material shall be inspected by third party as per the Scope of Third Party inspection (TPI) set out in this document. All materials despatched to Site must be accompanied by TPI Release notes. The TPI release notes shall carry TPI endorsement confirming compliance to the technical specifications stated in this document. 3.3 HPCL s approval on Technical Delivery Conditions duly vetted by TPI shall be obtained prior to commencement of production of steel plates. Technical Delivery Conditions shall cover all aspects of this specification including the role of TPI.

6 4.0 SCOPE OF THIRD PARTY INSPECTION :! "!! #$%& '#()%' ()* '##& &#' $& " $& a. Chemical Properties: Review & approval of Manufacturer s test reports for Ladle analysis. Witness & approval of Manufacturer s test reports for product analysis. b. Mechanical Properties: Yield strength; Tensile Strength & Elongation: Witness & approval of manufacturer s test reports conducted on two test samples/cast/heat. Witness & approval of manufacturer s test reports conducted on two sample tests per cast/heat for Bend tests.

7 Witness & approval of manufacturer s test reports conducted on one test sample taken from thickest product per cast/heat. Please refer Cl.12 of IS: for further details. c. Surface Condition: Review & approval of Manufacturer s Visual inspection reports for 100% for all plates complying with requirement of this Technical Specification. Witness and minimum 2 samples for each thickness. d. Dimensions: Review & approval of Manufacturer s visual inspection reports for 100% for all plates complying with requirement of this Technical Specification. Witness and 2 samples for each thickness. 5.0 Certified Documents : The supplier shall furnish 2 copies of all Certificates/ documents inclusive of all test certificates and TPI inspection release notes required as per this specification before shipment. The actual values obtained shall be recorded in the test certificates.

8 6.0 Painting & Coating : No painting / coating of any kind is permitted on steel plates. 7.0 All steel plates shall be packed in bundles so that there is no loss of plates in transit. 8.0 All the plates shall carry marking of Coil No. / Plate No. / Heat No., Size, Specification & BIS Stamping.