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 26 OF 48
PIPELINES
MEC/S/05/62/02 REVISION
sample sections for calibration of instruments
equipment for cleaning of surface to be examined
rules calibrated in centimeters for exact location of the position of defects.
The characteristics of the above - listed instruments and equipment shall
guarantee:
a) that the required standards of the inspection procedure, as previously
established and approved by the COMPANY, are satisfied.
b) continuous operation
15.5 Ultrasonic Instruments
All the instruments and equipment shall be approved by the COMPANY
before being used. The COMPANY has the authority to reject any item
which is considered unsuitable. The decision of the COMPANY is final.
The CONTRACTOR appointed to carry out ultrasonic inspections shall
also ensure the operational efficiency and maintenance of the instruments
and equipment, and shall immediately substitute any item rejected by the
COMPANY.
All the instruments and equipment necessary for carrying out ultrasonic
inspection on site shall satisfy the requirements laid down by the public
boards of institutions which regulate `safety at work'.
The Ultrasonic Instruments shall satisfy the following:
be pulse type, able to generate, receive and display, on the screen a
cathode ray tube (CRT) pulse at frequencies between 1 and 6 MHz. The
useful part of the CRT screen shall be at least 70mm wide and at least
50mm high.
shall have variable amplification, with steps of 1 or 2 dB over a range of a
least 60 dB.
\\Akjha\work contrac\standard TS for Pipe Line WC (Vol-II) MASTER FOLDER\02A welding onshore gas pipeline\Welding of Onshore Gas Pipelines with addendum - I 02A.doc