By By American Petrolium Institute
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Extra resources for API Recomended Practice 521, Guide for Pressure Relieving and Depressuring System
The opening time for the device used should be verified by the manufacturer and should also be compatible with the requirements of the system. 5 INFLUENCE OF PIPING AND PROCESS CONDITIONS To determine the influence of piping either in eliminating the need for a relieving device or in reducing relieving requirements, the configuration of the discharge piping and the contents (liquid or vapor) of the low-pressure side should be considered. Where the low-pressure side is in the vapor phase, full credit can be taken for the vapor-handling capacity of the outlet and inlet lines, provided that the inlet lines do not contain check valves or other equipment that could prevent backflow.
The selection of the proper location for the device so that it senses the overpressure in time to react to it. 2 PRESSURE CONSIDERATIONS Complete tube rupture, in which a large quantity of high pressure fluid will flow to the lower pressure exchanger side, is a remote but possible contingency. Minor leakage can seldom overpressure an exchanger during operation. Since standard hydrostatic test pressure is 150 [RP 521] Copyright by American Petroleum Institute (Tue Jun 26 09:28:13 2001) percent of the equipment design pressure, equipment failure, in other words, loss of containment of the low-pressure side to atmosphere, is unlikely to result from a tube rupture where the low pressure side (including upstream and downstream systems) is designed for at least two-thirds of the design pressure of the high pressure side.
Where multiple-layer insulating systems consist of different materials, the physical characteristics of each material under the expected temperature conditions should be examined. Typical values of thermal conductivity for various insulating materials appear in Table 6. 4 Calculation of Environmental Factor for External Insulation Limiting the heat input from fires by external insulation reduces both the rise of the vessel wall temperature and the generation of vapor inside the vessel. Insulation may also reduce the problem of disposing of the vapors and the expense of providing an exceptionally large relieving system to conduct the effluent to a point of disposal.
API Recomended Practice 521, Guide for Pressure Relieving and Depressuring System by By American Petrolium Institute