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Pressure Testing & Validation Services
 
 

 

Pressure Testing for Tank and Pressure Vessels
 
  • Hydraulic Pressure Testing (Oil Leak Test)
  • Pneumatic Pressure Test (Air Leak Test)
  • Hydro Static Pressure Test ( Water Leak Test)
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  • A hydrostatic test is a way in which pressure vessels such as pipelines, plumbing, gas cylinders, boilers and fuel tanks can be tested for strength and leaks. The test involves filling the vessel or pipe system with a liquid, usually water, which may be dyed to aid in visual leak detection, and pressurization of the vessel to the specified test pressure. Pressure tightness can be tested by shutting off the supply valve and observing whether there is a pressure loss. The location of a leak can be visually identified more easily if the water contains a colorant. Strength is usually tested by measuring permanent deformation of the container. Hydrostatic testing is the most common method employed for testing pipes and pressure vessels. Using this test helps maintain safety standards and durability of a vessel over time. Newly manufactured pieces are initially qualified using the hydrostatic test.
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  • Equipment:
  • Pressure gauges [1.5 to 4.0 times of test pressure]
  • Water tanks
  • Potable tanks
  • Pumps for water filling and pressure
  • Pressure gauges and temperature recorder
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  • service provider of filtration in all Industrial Oil, Oil Flushing of Hydraulic Pipelines and Chemical Cleaning.
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    Pressure Testing for Tank and Pressure Vessels
     
    Pipeline testing services
     
  • Hydrotesting of pipes, pipelines and vessels is performed to expose defective materials that have missed prior detection, ensure that any remaining defects are insignificant enough to allow operation at design pressures, expose possible leaks and serve as a final validation of the integrity of the constructed system. ASME B31.3 requires this testing to ensure tightness and strength.
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  • Buried high pressure oil and gas pipelines are tested for strength by pressurising them to at least 125% of their maximum allowable working pressure (MAWP) at any point along their length. Since many long distance transmission pipelines are designed to have a steel hoop stress of 80% of specified minimum yield strength (SMYS) at Maximum allowable operating pressure MAOP, this means that the steel is stressed to SMYS and above during the testing, and test sections must be selected to ensure that excessive plastic deformation does not occur
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  • For piping built to ASME B31.3, if the design temperature is greater than the test temperature, then the test pressure must be adjusted for the related allowable stress at the design temperature. This is done by multiplying 1.5 MAWP by the ratio of the allowable stress at the test temperature to allowable stress at the design temperature per ASME B31.3 Section 345.4.2 Equation 24. Test pressures need not exceed a value that would produce a stress higher than yield stress at test temperature. ASME B31.3 section 345.4.2 (c)
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  • Other codes require a more onerous approach. BS PD 8010-2 requires testing to 150% of the design pressure – which should not be less than the MAOP plus surge and other incidental effects that will occur during normal operation
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  • Leak testing is performed by balancing changes in the measured pressure in the test section against the theoretical pressure changes calculated from changes in the measured temperature of the test section.
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  • In the aerospace industry, depending on the airline, company or customer, certain codes will need to be followed. For example, Bell Helicopter has a certain specification that will have to be followed for any parts that will be used in their helicopters.
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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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