The Maximum Allowable Working Pressure (MAWP) is used to rate components, steam drums, piping, tubes, boilers and any other pressure vessel in a hydraulic system. The reason this is so important can be seen easily in steam systems. The temperature that a fluid boils increases as pressure increases and decreases if pressure decreases. What this means is if you are running a boiler at 200 psi the water will boil around 387 degrees F. If it is creating steam this is the minimum temperature. If the boiler cracks and the pressure drops to atmospheric pressure, water would boil at 212 degrees F. This creates superheating or heating passed the boiling point. This will create Flash steam and cause an explosion. The MAWP rating is to decrease the chances of this happening.
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Maximum Allowable Working Pressure
15 psi
MAEWP is an acronym for Maximum Allowable External Working Pressure.
The ASME Boiler and Pressure Vessel Code details all the various calculations necessary to determine the MAWP of any pressure vessel.
when the pressure increases over the maximum allowable working pressure of the vessel, the valve will open to protect against overpressure.
API 675 says that the metering pump has to be tested at 1.5 times the MAWP (Maximum Allowable Working pressure) but not less than 20psig (API 675 4.3.2.1)
This question can't be answered. It is unclear what you mean by back pressure. Maximum Allowable Working Pressure in a boiler is calculated using the rules for construction of high pressure boilers and construction of heating boilers in the ASME Code sections 1 and 8.
A pressure rating refers to the qualified operating pressure which is recommended for a component or a system by the manufacturer. The maximum working pressure of a 12" steel having a schedule of 40 at 100 degrees Fahrenheit is 855 psig.
The working pressure is also referred to as the Maximum Operating Pressure (MOP). The MOP is the highest pressure expected during operation. The Maximum Design Pressure (MDP) includes the maximum pressure that is protected by relief valves in case of failure. For example, if the MOP is 100 psi and their are relief valves set at 10% above the MOP the MDP would be 110 psi.
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It depends on the size, its material, how it was fabricated, its wall thickness, it working history, and how fast the pressure is applied. Typically any given pipe is rated with a "working pressure", which is "usually" 1/4 the "burst pressure".
Working pressure refers to the maximum safe *operating* pressure. Burst pressure refers to the actual point at which the vessel containing said pressure will fail. Operating pressures normally have a "buffer zone" between itself and burst pressure, to insure no sudden spikes or variations cause failure leading to injury.