Pipelaying Tender-VOL IV - WorleyParsons.com

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EPMC SERVICES FOR REWARI – KANPUR PIPELINE SPECIFICATION FOR PIPELINE HYDRO TESTING a detailed test certificate register, containing the results of non-destructive testing and hydrostatic pressure tests of each weld. The number of times each test head is used and the test pressure attained on each test shall be recorded. Entries in the register shall be signed by the test engineer. Test heads shall not be used if they do not have a complete certificate and record of use from the commencement of the Works. Wall thickness transitions shall meet the welding configuration requirements as specified in the ASME B31.3 and B31.4. NOTES: 1. The maximum thickness for design pressure (tD), shall not be greater than 1.5 times t, where t is the nominal wall thickness of the thinner pipe. 2. Pipes with a thickness less than 4.8mm shall not be used. Prior to re-use, the welded test head shall be cut back to remove all weld metal and the heat affected zone. To achieve this, at least 12mm of pipe shall be removed. Flexible hoses shall be the armored type and shall only be used if manufactured to the standards applicable for permanent hydraulic installations. Such hoses shall be as short as practicable and used only for the test head pressurizing line and instrumentation lines. One system of hose connectors from one supplier, if possible, shall be used to ensure that differing types are not interchanged. Prior to re-use, all hoses and connectors shall be visually inspected for damage. The method of anchoring shall be approved by OWNER. Electrical installations shall comply with the Project Design Specification. Particular attention is drawn to the use of electrical equipment in hazardous areas. Should diesel engines be used in hazardous areas, consideration of the protection of such engines is required. No such engines shall be used in, or within 15 meters of, a zone 1 area. Their use in zone 2 areas should be avoided wherever possible. If the use of diesel engines is unavoidable within 15 meters of a zone 1 or 2 area, or within a zone area, the following is required: • Surface temperature limitation to 250°C or to the specified temperature class. • Exhaust flame trap and spark arrester. n:\513-mh-2145-rkpl\11 engineering\11.8 pipelines\06 spec\specification for pipeline hydrotesting\mh2145-c000- pl-spc-0011.doc MH2145-C000-PL-SPC-0011 RevA Page 28 of 71
EPMC SERVICES FOR REWARI – KANPUR PIPELINE SPECIFICATION FOR PIPELINE HYDRO TESTING • Non-electric starting system. • An inlet air shut-down control system to operate on high temperature, over- speed and gas detection. • Cooling fan blades should be non-metallic and all fan belts anti-static fire resistant type. • Any ancillary electrical equipment shall comply with Project Design Specification. • Hot works permit listing necessary precautions to be taken. Test instruments shall be in accordance with the requirements of the Table below: Accuracy of Test Instruments Instrument Reading Division Range Accuracy Dead-weight Tester 0.01 bar 0 to 1.5 times Test Pressure ± 0.05 percent Pressure Gauge 1,2 or 5 bar 0 to 1.5 times Test Pressure ± 1 percent (Note 1) Pressure Recorder 2 or 5 bar 0 to 1.5 times Test Pressure ± 1 percent (Note 1) (24 hours) n:\513-mh-2145-rkpl\11 engineering\11.8 pipelines\06 spec\specification for pipeline hydrotesting\mh2145-c000- pl-spc-0011.doc MH2145-C000-PL-SPC-0011 RevA Page 29 of 71
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