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Wilkinson Coutts & Matthews Integrity Training


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WILKINSON COUTTS / MATTHEWS INTEGRITY HUB: an up-to-the-minute information mix designed to help you with your lifework and career development in the asset integrity, inspection and NDE industries.

Matthew Petroleum Notes

PRESSURE TEST QUIZ
HERE'S THEANSWERS

Qu1. Pressure testing of ASME pipework

According to ASME B31.3 terminology, a pressure test using water at 1.5 x MAWP is called a;

  1. Proof test
  2. Sensitive leak test
  3. Hydraulic test
  4. Hydrostatic leak test

Answer (d) .General point from B31.3 terminology

Qu2. Test pressures

What pressure would be used for a B31.3 hydrostatic leak test on pipework with a design (MAWP) pressure of 500 psi and a maximum design temperature of 800 degF

  1. It can vary, but definitely less than 500psi
  2. 650 psi
  3. 750 psi
  4. Greater than 750 psi

Answer (d) .Hydrotests (called a leak test under B31.3) use the S ratio so for 700DegF the pressure would be higher than 500 x 1.5

Qu3. Code-specified test pressures

Test pressures listed in ASME pressure equipment codes are

  1. Minimum pressures allowed for the test
  2. Maximum pressures allowed for the test
  3. Allowed a +/- 3% tolerance
  4. Allowed a +/- 10% tolerance

Answer (a) .This is the general principle. Note that there may also be maximums listed for safety purposed

Qu 4: Testing of storage tanks

What is the duration of a full hydrostatic test on a large above-ground cylindrical storage tank?

  1. 4 hours
  2. 8 hours
  3. 24 hours
  4. 48 hours

Answer (c) .API 653.

Qu5. Pressure testing temperature

The chances of brittle fracture during hydrostatic testing of a pressure equipment component are minimised by performing the test at what temperature?

  1. Below MDMT
  2. Above the grain transformation temperature
  3. Above the FATT transition temperature - Above the Ductile-Brittle (Charpy) transition temperature as determined by FATT test. Transformation test is a red herring…related to Normalising.  Testing below MDMT will increase the risk of brittle fracture.
  4. Below the FATT transition temperature

Answer (c) .Above the Ductile-Brittle (Charpy) transition temperature as determined by FATT test. Transformation test is a red herring…related to Normalising.  Testing below MDMT will increase the risk of brittle fracture


5-MINUTE COACHING

Pressure testing

Pressure testing is not a complete test for integrity but provides an important check for leakage and gross design errors. It is equally undesirable to either over-pressurise or under-pressurise a component. The type and test pressures used for pressure testing are specified by construction and post-construction codes. Terminology and test pressures vary between codes and components so can be a little confusing.

See our short slide presentation covering this topic

Pressuse Testing presentation

Matthews Masterclass