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What the is difference between MAWP and Design Pressure
- Thread starter ek4putr4
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My interpretation of MAWP when used for a pipeline code is that MAWP is typically used to describe the highest pressure allowed in a given component, such as a 2000 psig limited valve, whereas MAOP specifically refers to the maximum sustained operating pressure of the system or of a given segment in that system which is allowed by B31.8.
Thus if you were to use that 2000 psig MAWP rated valve in a segment of a B31.8 pipeline where the MAOP is limited to 1550 psig, for example by the wall thickness, pipe material yield stress and the area's class design factor, you would be perfectly OK. Note however that the entire segment would still have to operate with sustained pressures at all points in that segment (including the valve) at <= 1550 psig.
If you were to use an ANSI#600 class valve in that 1550 psig MAOP system or segment of a system you would NOT be OK, as that ANSI#600 valve would have a MAWP of 1480 psig at normal temperatures.
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"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)
Thus if you were to use that 2000 psig MAWP rated valve in a segment of a B31.8 pipeline where the MAOP is limited to 1550 psig, for example by the wall thickness, pipe material yield stress and the area's class design factor, you would be perfectly OK. Note however that the entire segment would still have to operate with sustained pressures at all points in that segment (including the valve) at <= 1550 psig.
If you were to use an ANSI#600 class valve in that 1550 psig MAOP system or segment of a system you would NOT be OK, as that ANSI#600 valve would have a MAWP of 1480 psig at normal temperatures.
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"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)
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