Relief Devices Revisited
Relief Devices Revisited (1995)-Let's review some of the factors to consider when selecting and installing relief valves: Design the pressure vessel to permit the relief valve to be set at least 25% above the maximum system pressure. Select a relief valve with sufficient capacity. Select a relief valve suitable for the type of refrigerant used. Use the proper size and length of discharging piping. Do not discharge relief valves prior to installation or when pressure testing the system. On large systems, use a three-way valve and two relief valves. Install the relief valve directly to the pressure vessel. Install the relief valve above the liquid level. Install the valves where they are accessible for inspection and repair. Make sure that you check to see that the valves and installation meet existing local, and I emphasize LOCAL CODES, because these may vary from ANSI Codes. Remember refrigerant relief devices are designed strictly for safety and are not functional or operating controls. A safety-relief valve is designed to relieve positively at its set pressure for one crucial occasion without prior leakage. Properly designed and maintained, they will provide years of trouble-free service.
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