API RP 521 Sizing, Selection, and Installation of - download pdf or read online

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3 Rupture disk selection is an iterative and sometimes complex process. The procedure given below should be used for rupture disk selection where there is no superimposed backpressure. Consult the manufacturer for assistance if needed. a) Select the upper limit of the manufacturing design range. This is typically based on the MAWP of the protected equipment as determined by the ASME Code or process requirements. 3), the upper limit of the manufacturing design range may exceed the MAWP of the protected equipment.

Example of a rupture disk with a specified burst pressure of 100 psig, manufacturing range of +8/-4%, burst tolerance of ± 5%, and a 70% operating ratio. 8 12 Maximum process operating pressure5 (Operating ratio, 80% of minimum burst pressure) C. Example of a rupture disk with a specified burst pressure of 20 psig, manufacturing range of +0/-10%, burst tolerance of ± 2 psig, and an 80% operating ratio. NOTE 1. See Figure 18 for limits on marked burst pressure. 105 Maximum burst pressure (includes 5% burst tolerance)3 2.

However, if the amount of variable superimposed backpressure is small, a conventional valve could be used provided: a) the bench set pressure (CDTP) has been appropriately compensated for superimposed backpressure; and b) the maximum pressure during relief does not exceed the code-allowed limits for accumulation in the equipment being protected. 3 For example, conventional valves are often used when the outlet is piped into a relief header without compensating the set pressures for the superimposed backpressure caused by other relieving devices.

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API RP 521 Sizing, Selection, and Installation of Pressure-Relieving Devices in Refineries - Part 1 Sizing and Selection by American Petroleum Institute


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