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 24 OF 48
PIPELINES
MEC/S/05/62/02 REVISION
15. ULTRASONIC INSPECTION
In addition to the radiographic inspection, ultrasonic inspection is required as per
conditions listed in paragraph 12.5 of this specification. This section concerns
manual ultrasonic inspection. However ultrasonic by automatic equipment may
be used if approved by the COMPANY.
15.1 Equipment and Operators
The CONTRACTOR who carries out the ultrasonic inspection shall have
sufficient qualified personnel equipment and instruments at his disposal to be
able to effect the tests without hindering or delaying the pipeline assembly
operations.
The operators shall be fully qualified as per a recognised standard (ASME Sec. V
or equivalent) and they shall have as minimum level II. The operators shall be
able to :
calibrate the equipment ;
perform an operational test under production conditions;
interpret the screen picture ;
evaluate the size and location of reflectors
interpret the type of defects detected
The COMPANY has the option of checking the ability of personnel employed for
ultrasonic testing by means of qualification tests.
The CONTRACTOR appointed to carry out ultrasonic inspection shall supply all
the instruments necessary for their execution on site.
15.2 Specification for Ultrasonic Inspection Procedure Qualification
Before work beqins, the CONTRACTOR shall present a specification describing
the proposed U.T. procedure qualification.
This specification shall state, as an indication only but not limited to the following
information :
type of U.T. equipment used
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