Under normal circumstances: How are the operating pressure, design pressure, and safe relief pressure of atmospheric-pressure storage tanks determined?
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Under normal circumstances: How are the operating pressure, design pressure, and safe relief pressure of atmospheric-pressure storage tanks determined?
For tanks that are in communication with the atmosphere, working pressure and design pressure generally do not matter. For storage tanks with nitrogen sealing or internal floating roofs, the design pressure is generally 2~5 kPa. Of course, ordinary atmospheric pressure tanks are not equipped with safety valves; they only have breather valves. For atmospheric-pressure, low-temperature tanks for liquefied hydrocarbons, the calculation of the safety valves and venting capacity is based on API 2000.
The design pressure for the liquid ammonia storage tanks we manufacture at atmospheric pressure is 6000 Pa; the breathing valve opens at 3000 Pa, the safety valve opens at 4000 Pa, and the control valve automatically opens at 5000 Pa.