standard specification for fabrication and erection of piping

More documents

Recommendations

Info

The test pressure is to be maintained for sufficient time to permit complete inspection of the system under test but in no case shall the time be less than ten minutes. Test shall be considered complete only when approval is given by the Engineer in charge. Test Gauges: Draining Contractor’s own test gauge shall be installed as close as possible to the lowest point in the system being tested. Prior to installation, the test gauge shall be checked against a standard gauge or calibrated with the aid of a dead weight tester. Calibration of test gauges shall be the responsibility of the contractor. All lines and equipments shall be completely drained after the hydrostatic test of a system has been completed. High point vents shall be open to prevent excessive vacuum and permit complete draining.If it becomes necessary to leave a system filled with the testing medium for any abnormal length of time, such as venting shall be made to provide for possible liquid expansion with change in ambient temperatures. 10.0 RECORDS Records in triplicate shall be made for each piping system as follows: 10.1 In case of underground piping, layouts giving actual elevations or pipeline as laid. 10.2 Test certificates containing date or test, identification of the piping system, test fluid used, test pressure and approval of owner’s inspector. Certificates for flushing containing flushing medium used, identification of the piping system, date of flushing and approval by owner’s inspector. PAYMENT Payment for piping shall be based on linear measurements calculated on the basis of the execution drawings. The length shall be measured along the centre lines of pipes, centre lines of bends and elbows, tees, reducer, SW, flanged joints. All types of valves shall be excluded from this measurement. Branch connections shall be measured from the outer surface of the header. The payment shall be made on per metre basis of piping work erected, measured to the nearest centimeter. The unit rates for the underground piping shall be inclusive of earthwork excavation, backfilling, and compaction, disposal of surplus earth, coating and wrapping including supply of materials. The unit rates for above ground carbon steel piping shall be exclusive of erection of all types of supports but inclusive of supply of necessary bolts nuts and washers gaskets etc as per respective specification. Payment for the installation of sluice valves, check valves, butterfly valves, expansion bellows will be made on number basis and the unit rates shall be inclusive of supply of necessary bolts nuts, washers and gaskets, etc.
All piping attachments, such as coupling, nipples, thermo wells etc. shall be installed by the Contractor as per the piping work and no separate payment shall be made for such work. However, extension on such attachments such as vents and drains will be measured and paid as applicable for the respective size and category of piping / valves. Fabrication of mitre bend, concentric and eccentric reducers fabricated from pipes supplied by owner, and fabrication of flanges from plates supplied by owner, will be paid at respective unit rates. However, erection of these items will be along with piping of the respective size and no separate payment will be made for erection. The reducers will be measured and paid along with the piping of large diameter. No separate payment will be made for making pipe to pipe branch connection crosses with or without reinforcing pads and the unit rates for piping are deemed to include all such work. Fabrication, installation and removal of temporary spool pieces etc. to aid contractor’s work such as fabrication, erection, flushing testing, and etc. will neither be measured nor paid separately. The same is deemed to be included in the unit rates for piping. Payment for carrying out radiographic examination shall be based on linear length of the welded joint radiographed. Repeat radiography / additional radiography required due to contractor’s fault / poor performance of his welders, defective films shall be done at contractor’s own cost. WELDING SPECIFICATION FOR THE FABRICATION OF PIPING (Above Ground Portion) 1. GENERAL This specification shall be followed for the fabrication of all types of welded joints of carbon steel and alloy steel piping system within the battery limits of the plant. The welded pipe joints shall include the following: a) All pipe joints of the longitudinal and circumferential butt welded and socket welded types. b) Attachments of forgings, flanges and other supports to pipes. c) Welded manifold headers and other sub-assemblies d) Welded branch connections with or without reinforcing pads. e) Joints in welded / fabricated piping components. f) The attachments of smaller connections for vents, drain drips and other instrument tappings. Any approval granted by the Engineer-in-charge or Owner's inspector, shall not relieve the Contractor of his responsibilities and guarantee. This specification shall not be applicable for welding of pipelines for transportation of liquid petroleum and other similar products. 2. APPLICATION CODES &STANDARDS : All welding work, equipments for welding, heat treatment, other auxiliary functions and the welding personnel shall meet the requirements of the latest editions of the following expected standards and procedures unless otherwise specified in the Welding specification chart and
Page 1 and 2: STANDARD SPECIFICATION FOR FABRICAT
Page 3 and 4: Std. spec for earth work for U/G pi
Page 5 and 6: All field fabricated piping shall a
Page 7 and 8: space on each side of the pipe. The
Page 9 and 10: The completed system shall then be
Page 11: The field test pressure shall where
Page 15 and 16: 5. SHIELDING & PURGING GAS : 5.1 Ar
Page 17 and 18: 9.6 Engineer-in-charge shall check
Page 19 and 20: g) Automatic temperature recorders
Page 21 and 22: ) The extent of Radiography shall b

standard specification for fabrication and erection of piping

Create successful ePaper yourself

Delete template?

Save as template?