Download PDF by By American Petrolium Institute: API Recomended Practice 521, Guide for Pressure Relieving

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

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D. Safe disposal of vented streams should be provided. e. No credit is recommended when safety valves are being sized for fire exposure. 3. 4 Earth-Covered Storage Covering a pressure vessel with earth is another effective method of limiting heat input. 5 Limiting Fire Areas With Diversion Walls Diversion walls can be provided to deflect vessel spills from other vessels. 1 General To calculate the fire relief requirement, the advantage of reduced capacity to be gained by using the F factor (Table 5) permitted by the vessel's fire protection insulation system should be used in the absence of other special instructions.

V = volume available for the vapor, in cubic feet (cubic meters). ν = relating to liquid flash or vapor generated from pressure reduction. W = vapor flow rate per unit of time, in pounds per hour (kilograms per hour). Wt = weight of liquid or vapor, in pounds (kilograms). X = weight fraction of the initial liquid in the system vaporized as a result of depressuring (dimensionless). z = compressibility factor (dimensionless). ∆ = difference, for example,∆ Tn = Tn−1 − Tn . λ = average latent heat of the liquid, in British thermal units per pound (kilojoule per kilogram).

In such cases, the necessary physical properties of the containing fluid may need to be obtained from actual data or estimated from equations of state. The effects of vessel mass and insulation may need to be considered. The pressure-relieving rate is based on an unsteady state. As the fire continues, the vessel wall temperature and the contained gas temperature and pressure increase with time. The pressure relief valve will open at the set pressure. With the loss of fluid on relief, the temperatures will further increase at the relief pressure.

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


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