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 51 OF 62
MEC/S/05/62/06 REVISION 0
• Equipment for cleaning of surface to be examined.
• Rulers 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
1.5 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 inspection 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 instrument and equipment necessary for carrying out ultrasonic
inspection on site shall satisfy the requirements laid down by the public
board of institutions which regulate "safety at work".
The ultrasonic instruments :
• Shall be each 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 70m wide and at
least 50mm high.
• Shall have various amplification, with steps of 1 or 2 dB over a range of a
least 60 dB.
• The regulation control shall be accurate to within 1 dB and this accuracy
shall be certified by the instrument manufacturer.