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 23 OF 48
PIPELINES
MEC/S/05/62/02 REVISION
14.6.3 Requirements (Note-1)
The impact energy shall be :
Sl. Test Specimen in "Average of three Minimum Single
No. mm Specimens (Note-2) Value (Note-1)
Joules (Min.) Joules
1. 10.0 27.0 22.0
2. 7.5 21.5 17.0
3. 5.0 18.5 15.0
4. 2.5 10.0 8.0
Note :
1) Only one value is permitted to be lower than average value upto the value
specified.
2) These values are specified for resistance to brittle fracture only, where
additional requirements are specified in project data sheet. (Ex. pipeline
materials with arrest properties i.e. a higher upper shelf charpy V-energy
for resistance against propagating ductile fractures) the same shall be
followed.
14.7 Bend Test Requirements
The Bend test Specimens shall be made and tested as per the requirements of
API 1104 Sixteenth Edition May 1983 except that the dimensions of the Jig for
guided bend test Fig. 5 para 2.6 API 1104 shall be modified as follows:
Radius of the Plunger `A' : 2 t
Radius of the die `B' : 3 t + 1.6mm
Radius of the die `C' : 50.8mm
The acceptance criterion on shall however be as per para 2.643 and 2.653 of API
1104 Eighteenth edition May 1994.
Note : t = thickness of specimen
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