Volume-II - GAIL
Volume-II - GAIL
Volume-II - GAIL
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
9.2.1 Heat Analysis<br />
Where the steel mill is not a part of an integrated pipe mill, heat analysis shall be reported by<br />
the Manufacturer prior to start of pipe production.<br />
9.2.2 Product Analysis<br />
9.2.2.1<br />
9.2.2.2<br />
Sampling Frequency<br />
Two pipes per inspection lot shall be analysed. Inspection lot shall be 50 pipes per heat. Pipes<br />
selected shall be such that one at the beginning of the heat and one at the end of the heat is<br />
also represented.<br />
Sampling Method<br />
9.2.2.2.2 Welded Pipe<br />
Sample for Product analysis shall be taken from finished pipes. Sample for product analysis<br />
from skelp may be used provided that the traceability of samples is guaranteed.<br />
9.3 Testing of Mechanical Properties<br />
9.3.1 Tensile Tests<br />
Tensile properties shall be determined from specimen removed from pipe which has been<br />
subjected to all mechanical and heat treatment operations.<br />
9.3.1.2 Tensile Testing Frequency<br />
Tensile test shall be performed on samples taken from two pipes per inspection lot. Inspection<br />
lot shall be 50 pipes per heat. API Spec. Table 13 stands modified accordingly.<br />
9.3.1.4 Transverse Tensile Tests<br />
The transverse tensile tests shall be carried out on flattened rectangular specimen.<br />
9.3.1.5 Weld Tensile Tests<br />
For EW Pipes<br />
Inside and outside flash of weld in excess of pipe wall thickness shall be removed from the<br />
specimen either by grinding or machining. Specimen shall be tested for ultimate tensile<br />
strength (UTS) only. The testing frequency shall be one test per inspection lot. Inspection lot<br />
shall be 50 pipes per heat.<br />
For SAW Pipes<br />
Inside and outside weld reinforcement in excess of pipe wall thickness shall be removed from the<br />
specimen either by grinding or machining. Specimen shall be tested to determine, Ultimate Tensile<br />
Strength only.<br />
A cylindrical all weld tensile test shall be carried out at the time of first day production as specified<br />
in Annexure-I of this specification to determine the Yield Strength, UTS & Elongation.<br />
The cylindrical all weld specimen shall have gauge length, L=5d, where<br />
<strong>GAIL</strong> (INDIA) LIMITED CARBON STEEL LINE PIPES <strong>GAIL</strong>-TS-LINEPIPE-CS<br />
Page 13 of 37
Change language