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PNEUMATIC PRESSURE TESTING SERVICES & TRAINING
 
 

 

PNEUMATIC PRESSURE TESTING
 
  • 1. Precautions: Pneumatic testing involves the hazard of released energy stored in compressed gas. Particular care must be taken. It is recommended to be used only when piping systems are so designed that they cannot be filled with water, i.e, refrigerant systems; or when piping systems are to be used in services where traces of the testing medium cannot be tolerated..
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  • 2. Test fluid: The gas used as test fluid, if not air, shall be nonflammable and nontoxic, such as nitrogen.
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  • 3. Pressure and procedure: the pressure limits and methodology is different for the codes mentioned above.
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    ASME B3.1
     
  • The pneumatic test pressure shall not be less than 1.2 nor more than 1.5 times the design pressure of the piping system. It shall not exceed the maximum allowable test pressure of any non-isolated component.
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  • The pressure in the system shall gradually be increased to not more than 1/2 of the test pressure, after which the pressure shall be increased in steps of approximately 1/10 of the test pressure until the required test pressure is reached. The pressure shall be continuously maintained for a minimum time of 10 min.
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  • It shall then be reduced to the lower of design pressure or 100 psig [700 kPa (gage)] and held for such time as may be necessary to conduct the examination for leakage. Examination for leakage by soap bubble or equivalent method shall be made of all joints and connections.
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    ASME B3.1
     
  • The test pressure shall not be less than 1.1 times the design pressure and shall not exceed the lower of 1.33 times the design pressure or the pressure that would produce a nominal pressure stress or longitudinal stress in excess of 90 % of the yield stress of any component at the test temperature.
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  • The pressure shall be increased until a gage pressure, which is the lower of 0.5 times the test pressure or 170 kPa (25 psi), at which time a preliminary check shall be made. Thereafter, the pressure shall be gradually increased in steps until the pressure is reached, holding the pressure at each step until the piping strains are equalized.
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  • The pressure shall then be reduced to the design pressure before examining for leakage. During the test, a pressure relief device shall be provided, having a set pressure not higher than the test pressure plus the lower of 345 kPa (50 psi) or 10% of the test pressure.
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    ASME B31.5
  • The test pressure shall be at least 1.1 and shall not exceed 1.3 times the design pressure of any component in the system. The pressure in the system shall be gradually increased to 0.5 times the test pressure, after which the pressure shall be increased in steps of approximately 1/10 of the test pressure until the required test pressure is reached.
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  • The test pressure shall be maintained for at least 10 minutes. It may then be reduced to the design pressure and conduct the examination for leakage. During the test, a pressure relief device shall be provided, having a set pressure above the test pressure, but low enough to prevent permanent deformation of any of the system components.
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    pressure Testing Equipment:
     
  • Pressure gauges [1.5 to 4.0 times of test pressure]
  • Water tanks
  • Potable tanks
  • umps for water filling and pressure
  • Pressure gauges and temperature recorder
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    pressure Testing services
     
  • Pipeline Pressure testing
  • hydraulic pressure testing
  • Oil Leak testing
  • Pneumatic Pressure Testing
  • air Leak testing
  • Hydro Static Pressure Testing
  • Oil Leak testing
  • Api spec 6a pr1 Testing
  • Api spec 6a pr2 Testing
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    Pipeline Pressure Testing Services
     
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    PWHT SERVICES
     
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