Hydro-testing

A hydrostatic test is performed to determine the integrity and soundness of pressure vessels and piping joints. A decrease in the applied pressure or leakage through the products or joints or plastic deformation or distortion or bulging in the product is indication of inadequate quality of the product under test.  

This test method is also termed as Leak testing (based on the principles of leakage during pressurised condition) and Pressure Drop Test (based on the principles of decrease in pressure during test due to unacceptable discontinuities). It is also the most common method often employed and it is the one of the most reliable test methods when determining the integrity and soundness of the vessel. Some of the standards permits hydrostatic test as a substitute for other expensive non-destructive test methods. 

This test is preferred over pneumatic test due to safety reasons. Hydrostatic test method is applied on the newly manufactured pressure equipments, after alterations, repairs and before recommissioning stage. 

Servtech holds proven test procedures and NATA accreditation for testing of pressure vessels, pressure piping, cylinders, pipes, hoses, valves, fittings and other pressure components. Servtech performs hydrostatic test in accordance with AS 4037, AS 4458, AS 4041, AS 1210, AS 1228, AS 2885.2, AS 1579, AS 1631, ASME V Article

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Services available;

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• Flushing the system

• Hydrostatic Pressure test

• Pneumatic Pressure Test System Leak Test

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Procedures;

 

- All prefabricated piping spools shall be shop hydro-tested.

- Before filling with water cleanliness of system shall be checked and flushed with water to ensure they are clear of refuse that may have accumulated during fabrication.

- All NDT as per specs shall be completed and accepted before filling water.

- All joints including welds are to be left unpainted, free of dirt, grease & temporary protective coatings.

- Piping spools shall be laying on wooden supports above ground.

- Pressure gauges/chart recorders shall be calibrated and certified prior to test.

- The pump shall have independent pressure gauge fitted. The test pressure shall be applied by test pump as required.

- The pressure will be applied 50% initially and then gradually increased in steps of 10% until test pressure is achieved.

- The pump shall be isolated from the system when the test pressure has been attained.

- Test pressure shall be maintained for 1 hour and it will be witness by the Client.

- The portable tap water shall be used in hydrostatic test.

- Gasket used for test shall not be used for final piping erection.

- Test pack documents shall be completed and signed.