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Preparation for Piping Testing

Posted by Antony Thomas at Monday, May 16, 2011

Preparation for Piping Testing

All joints in a test section shall be accessible during tests and shall not be painted, insulated, backfilled or otherwise covered until satisfactory completion of testing in accordance with this specification.

All vents and other connections which can serve as vents shall be open during filling so that all air is vented prior to applying test pressure to the system.Test vents shall be installed at high points.

Equipment which is not to be subjected to pressure test shall be either disconnected from the piping or blocked off during the test.Safety valve sand control valves shall not be included in site pressure testing.

Temporary spades and blanks installed for testing purposes shall be designed to withstand the test pressure without distortion.Presence of spades shall be clearly visible during testing.

All control valves shall be removed or replaced with temporary spools or

blinded off during pressure testing.

Check valves shall have the flap or piston removed for testing, where pressure can not be located on the upstream side of the valve.The locking device of the flap pivot pin shall be reinstated together with the flap and anew cover gasket shall be installed after completion of the test.

Spring supports shall be restrained or removed and expansion bellows

removed during hydrostatic testing.

Drain points for fluid disposal after testing, shall be provided.

Care shall be taken to avoid overloading any parts of the supporting

structures during hydrostatic testing.

Piping which is spring or counterweight supported shall be blocked up temporarily to a degree sufficient to sustain the weight of the test medium.Holding pins shall not be removed from spring supports until testing is completed and the system is drained.

Pressure in the system shall be introduced gradually until the pressure is the lesser of one-half of the test pressure or 170 kPa gauge.Maintain pressure for 10 minutes and then gradually increase pressure in steps of one tenth of the test pressure until the test pressure is attained.

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