Volume-II of IV - GAIL

MECON LIMITED
REGD. OFF: RANCHI (BIHAR)
PROCESS & PIPING
DESIGN SECTION
NEW DELHI
STANDARD SPECIFICATION
TITLE Flushing and Testing SPECIFICATION NO. PAGE 2 OF 9
1.0 SCOPE
2.0 Inspection
3.0 Flushing
MEC/S/05/62/11 REVISION 0
This specification covers the general requirements for Inspection, flushing and
testing of piping systems. However testing of steam lines falling under IBR shall
also be governed by Indian Boiler Regulations.
Flushing and testing of all piping system shall be witnessed by the Engineer-in-
Charge.
During various stage and after completion fabrication and erection, the piping
system shall be inspected by the Engineer- in - Charge to ensure that :
- Proper piping material has been used.
- Piping has been erected as per drawings and the instruction of the
engineer- in charge.
- All supports have been installed correctly.
- Test preparations mentioned in this specification have been carried out.
Flushing of all lines shall be done before pressure testing. Flushing shall be
done by fresh potable water or dry compressed air, wherever water flushing is
not desirable, to clean the pipe of all dirt, debris or loose foreign materials.
Required pressure of water, flushing shall meet the fire hydrant pressure or
utility water pressure. For air flushing the line, system will be pressurised by
compressed air at the required pressure which shall be 50 psi maximum. The
pressure shall then be released by quick opening of a valve, already in the line
for this purpose. This procedure shall be repeated as many times as required till
the inside of the pipe is fully cleaned.