Volume-II of IV - GAIL

MECON LIMITED
REGD. OFF : RANCHI (BIHAR)
PROCESS & PIPING
DESIGN SECTION
NEW DELHI
STANDARD SPECIFICATION
TITLE WELDING OF ONSHORE GAS
SPECIFICATION NO. PAGE 19 OF 48
PIPELINES
MEC/S/05/62/02 REVISION
13.3 Weld Rejected by Accumulation of Defects
Where a weld is rejected by the accumulation of defect clause, as defined by API
1104 and this specification, repairs within these limitations are permitted. Defects
in the filling and capping passes shall be repaired preferentially.
14. DESTRUCTIVE TESTING OF WELDED JOINT - BUTT WELDS
14.1 Preparation
Having passed the visual and the non-destructive-inspection the test weld shall
be subject to mechanical test.
After satisfactory completion of all visual and non-destructive testing the test weld
shall be set aside for a period not less than 24hours. No further work on the test
weld and no cutting of test specimens from the weld shall be performed until a
period of at least 24 hours has expired.
Weld specimens shall be taken from the positions indicated in Fig. 1 of this
specification from areas as free from defects as possible; for this reason it is
necessary to take the previous non-destructive tests into account. The minimum
number of tests to be carried out is given in Table-1 of this specification.
The tests shall be carried out in laboratories approved by the COMPANY. The
specimens shall be prepared in accordance with the figures given in the
paragraphs which refer to the individual tests.
14.2 Tensile Strength
Specimens shall be taken from the position indicated in Fig. 1 & 1A of this
specification. Two ISO type specimens and two API - type specimens shall be
taken.
The ISO test specimen are shown in Fig. 2 of this specification.
14.2.1 Method
The test shall be carried out in accordance with ISO:375.
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