【文章內(nèi)容簡(jiǎn)介】 l shall be in accordance with Company Specification Number (LD272/322SPCGENST1002) and as detailed on the Construction Drawings. The substitution of materials or modification of details or both as defined in this Specification or on the Construction Drawings shall require written approval by the Company. All free issue materials shall be supplied to the Contractor acpanied by copies of the appropriate mill certificate. Materials supplied by the Contractor shall be new and supplied to a standard as required by the contract specification. All certification documentation shall be submitted to the Company for approval. Material Control The Contractor shall utilize already established system for ensuring that all SPECIFICATION FORSTRUCTURAL FABRICATIONPAGE 7 Of 16 CNOOC ENGINEERING LD272/322SPCGENST0003material received on site are properly identified. This system shall ensure that only the appropriate material is used in fabrication and that every part of the fabricated structure can be correlated to the relevant material documentation. The system shall detail the Contractor39。s methods of material receiving control, shop fabrication material control and field fabrication material control. The material control system shall require that all cutoffs have the appropriate plate number and heat and cast number transferred with low stress round nosed die stamps, together with identification of the direction of rolling. All surplus the Company supply material cutoffs shall be logged and segregated from the main batches for disposal or use, as instructed by the Company. For such types of material(H shapes which flange and depth is less than 300mm, the tubular less than φ406 and plate which thickness less than 16mm) shall not be required Traceability. Material that cannot be identified shall be rejected. Material Storage and Handling The Contractor shall submit detailed proposals for storage, handling, and protection of materials to be used in fabrication for the Company review and approval. The Contractor shall be responsible at all times for the proper protection of all materials from the effects of weather and mechanical damage. Material whose condition is unacceptable to the Company shall be replaced at the Contractor39。s expense. All small portable items of steelworks and all fittings and equipment shall be stored under warehouse conditions. The handling of materials shall at all times be carried out to avoid mechanical damage.3 GENERAL STRUCTURAL WELDING REQUIREMENTSAll welding shall be performed in accordance with AWS , Structural Welding Code, and the requirements of Specification for jacket and deck, Structural Welding and Inspection in LD272/322SPCGENST1004.4 FABRICATION AND CONSTRUCTION General Equipment and PlantThe Contractor shall supply adequate plant, tools, and all other necessary equipment and services to ensure that the steelwork is fabricated and erected in accordance with the Scope of Work. All plant and equipment shall be adequate capacity and shall be maintained in good working order. Reasonable spares shall be SPECIFICATION FORSTRUCTURAL FABRICATIONPAGE 8 Of 16 CNOOC ENGINEERING LD272/322SPCGENST0003provided to ensure continuity of working. Erection Loads and Stability The Contractor shall consider during site assembly all temporary erection loads imposed on the structure from supports, jacking and slinging at each stage of the structure assembly.The Contractor shall consider at each stage of the structural assembly the local or overall stability from selfweight and environmental loads, inclusive of scaffolding, staging, welding shelters and temporary works. The Contractor shall ensure that all stresses induced in the structure, during fabrication and load out, are not greater than the allowable stresses in the AISC Steel Construction Manual. Builtin stressed due to the fabrication procedure shall be minimized. Shop DrawingsThe Contractor shall prepare plete and detailed shop drawings for review by the Company. No fabrication work shall mence prior to receipt of the appropriate Shop Drawings. Material IdentificationAll ponents shall be clearly marked in accordance with the approved scheme of member and weld identification.The Contractor shall maintain the steel plate identification throughout the fabrication on cut sections of plate and on the outside of tubular, prior to cutting. ProtectionWork shall not be performed when lack of protection does not permit satisfactory workmanship or condition prevent adequate inspection.If any fabrication is to be carried out in the vicinity of equipment already installed in connection with the works, then before fabrication work mences the Contractor shall provide adequate protection to prevent any damage from weld spatter, flame cutting droplets and debris, all to the Company39。s approval. No welding is permitted onto installed equipment or ancillaries. Fabrication SequencesThe Contractor shall develop fabrication sequence procedures which shall specify the assembly requirements and welding sequence to minimize distortion and shrinkage in such a manner that the tolerances specified may be achieved without the necessity for reworking.An overall fabrication plan shall be submitted for review by the Company prior to mencement of fabrication.In the event of excessive distortion any reworking shall be subject to the prior approval of the Company. Procedures for anticipated rework situations shall be SPECIFICATION FORSTRUCTURAL FABRICATIONPAGE 9 Of 16 CNOOC ENGINEERING L