By American Petrolium Institute's API Recomended Practice 521, Guide for Pressure Relieving PDF

By By American Petrolium Institute

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Extra resources for API Recomended Practice 521, Guide for Pressure Relieving and Depressuring System

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3 DETERMINING THE REQUIRED RELIEF FLOW RATE In practice, an internal failure can vary from a pinhole leak to a complete tube rupture. For the purpose of determining the required relieving flow rate, the following basis should be used: a. The tube failure is a sharp break in one tube. b. The tube failure is assumed to occur at the back side of the tubesheet. c. The high-pressure fluid is assumed to flow both through the tube stub remaining in the tube sheet and through the other longer section of tube.

1 GENERAL Determination of relieving requirements resulting from power failures requires a careful plant or system analysis to evaluate what equipment is affected by the power failure and how failure of the equipment affects plant operation. 6. Automatic standby is an excellent device for maximizing the unit's on-stream time, minimizing unit upsets, and ensuring unit production rates but the circuitry, sequences, and components involved are not yet considered sufficiently reliable to permit credit for them in establishing individual relieving requirements.

This is not a standard latent-heating effect but is more properly termed degassing or dissolution. Vapor generation is determined by the rate of change in equilibrium caused by increasing temperature. For these and other multicomponent mixtures that have a wide boiling range, a time-dependent model may have to be developed where the total heat input to the vessel not only causes vaporization but also raises the temperature of the remaining liquid, keeping it at its boiling point. Reference 13 gives an example of a time-dependent model used to calculate relief requirements for a vessel that is exposed to fire and that contains fluids near or above the critical range.

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API Recomended Practice 521, Guide for Pressure Relieving and Depressuring System by By American Petrolium Institute


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