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The Premium Edition adds important features such as complete software maintenance, security advisory, frequent minor upgrade versions, downloads, Pack exports and imports, 24×7 scheduling and more. Simply double-click the downloaded file to install it. You can choose your language settings from within the program. Eng-Tips’s functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. 8 Hydrostatic Testing Interpretation ASME B31. What is the intent of the word “Maintenance”?
I am interpreting maintenance to be maintain the pressure at or above the minimum pressure. ASME is very vague on hydro testing requirements. My main question is can I increase pressure to keep my test above the minimum pressure, and my time doesn’t start over if I pressure up? API has a clear direction as to how the test is performed.
I am trying to find out if ASME follows this same guide lines. In this case, it means to continue the test. Any water added to maintain test pressure should correspond to that volume which would be expected to be needed to compensate for temperature changes, specifically not being the result of any leak. Do not stop the test timing period, unless the pressure dropped below minimum. The only way to increase pressure is to add water.
Yes you can, but you should already be identifying the reasons why, i. A steady temperature or rising temperature could show the reason is a leak. Also: If you get a response it’s polite to respond to it. It does state that you can bleed off if pressure exceed the maximum test pressure. My problem is, I have TPI that bring past project requirements onto my project and argue that my interpretation is incorrect. Minimum Test Pressure 16,250 psi, Target Test Pressure 16,500 psi, Maximum test pressure 16,737. If it’s not buried then just visually examine it for a shorter pressure test.
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At that length it’ll be really difficult to keep pressure in that sort of range. Codes don’t always say what you can and can’t do, there are too many variables to be prescriptive so it’s up to each system to work it out to Brett the basic principle. When I write a hydrostatic test procedure under B31. 8 I specify a test pressure and allow an hour to add or remove water to maintain the pressure. At the end of the hour the test starts and the operator is allowed to remove water, but not add any. In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. 8 states that the strength test needs to maintain the minimum pressure as stated in table 841.
2-1 – “the minimum pressure shall be obtained and held at the highest elevation” – my italics. Sorry to be picky but B 31. 8 doesn’t have MAWP, it has MAOP and MOP. Early on, my procedures allowed adding water from a measured container and noting how much was added, but I couldn’t get agreement on what the volume meant. There are a lot of words in B31. 8 that require a lot of interpretation. Just out of curiosity I did a search for “maximum allowable working pressure” and found a dozen occurrences before I stopped.