Volume-II of IV - GAIL

MECON LIMITED
REGD. OFF: RANCHI (BIHAR)
PROCESS & PIPING
DESIGN SECTION
NEW DELHI
TITLE PIPING FABRICATION AND
ERECTION
STANDARD SPECIFICATION
SPECIFICATION NO. PAGE 18 OF 62
MEC/S/05/62/06 REVISION 0
j) Each joint shall bear an identification number which shall be maintained
in the piping sketch to be prepared by the contractor. The joint
identification number should appear on the corresponding post weld heat
treatment charts. The same identification numbers shall also be followed
for identification for corresponding radiographic films. The chart
containing the identification numbers and piping sketch shall be
submitted to the Engineer-in-charge in suitable folders.
k) The hardness of the heat affected zone as well as of the weld metal, after
heat treatment, shall be measured using suitable hardness tester and
shall not exceed the maximum hardness specified in the welding
specification chart. The weld joint shall be subjected to re-heat treatment
when hardness measured exceeds the specified limit, at the contractor's
own expenses.
l) The contractor shall arrange for the hardness testing and shall maintain
the records of all joints tested. These records shall be checked by the
plant Owner's inspector.
1.12 Cleaning of the Weld Joints
All weld joints shall be free from adherent weld spatter, slag, dirt or foreign
matter. This can be achieved by brushing.
1.13 Inspection & Testing
1.13.1 General
a) The owner's inspector shall have free access to all concerned areas,
where the actual work is being performed. The contractor shall also offer
the Owner's inspector all means and facilities necessary for carrying out
inspection.
b) The owner is entitled to depute his own inspector to the shop or field
where pre-fabrication and erection of pipelines are being done with (but
not limited to) the following objectives :-
i. To check the conformance to relevant standards and suitability of
various welding equipments and the welding performance.