Volume-II of IV - GAIL

MECON LIMITED
REGD. OFF: RANCHI (BIHAR)
PROCESS & PIPING
DESIGN SECTION
NEW DELHI
STANDARD SPECIFICATION
TITLE SPECIFICATION NO. PAGE 10 OF 10
4.4.2 Air Test
Flushing and Testing MEC/S/05/62/11 REVISION 0
Care shall be taken to avoid increase in the pressure due to atmospheric
variation during the test.
When testing with air, pressure shall be supplied by means of a compressor.
The compressor shall be portable type with a receiver after cooler & oil
separator.
Piping to be tested by air shall have joints covered with a soap and water
solution so that the joints can be examined for leaks.
All other activities shall be same as per hydrotesting procedure (specified
above).
4.5 Completion of Testing
After the hydrostatic test has been completed, pressure shall be released in a
manner and at a rate so as not to endanger personnel or damage equipments.
All vents and drains shall be opened before the system is to be drained and
shall remain open till all draining is complete, so as to prevent formation of
vacuum in the system. After draining lines/systems shall be dried by air.
After testing is completed the test blinds shall be removed and equipment/piping
isolated during testing shall be connected using the specified gaskets, bolts and
nuts. These connections shall be checked for tightness in subsequent
pneumatic tests to be carried out by the contractor for complete loop/circuit
including equipments (except rotary equipments).
Pressure tests shall be considered complete only after approved by the
Engineer-in-charge. Defects, if any, noticed during testing shall be rectified
immediately and retesting of the system/line shall be done by the contractor at
his cost.
4.6 Test Records
Records in triplicate shall be prepared and submitted by the contractor for each
piping system, for the pressure test done in the proforma as given in Exhibit `F'.