API 521 FireCase

Fire relief loads. API 521 "Pressure-relieving and Depressuring Systems" Tag Execution Height to floor H Diameter D Liquid level F Effective liquid level Feff Length L Type of ends Drainage/Firefighting Factor drainage/firefighting Factor F Type of equipment Wetted surface Aws

0455A-0455B Horizontal 145 610 425 280 2658 Ellipsoidal

mm mm mm mm mm

With measures 43200 1 m2 2.80

Total absorbed heat Q

164.8305

kW

Set pressure Latent heat of vaporization hvlo Mass Flow W

4 503.7 281.426

bar kcal/kg kg/h

Total Mass Flow (1) Valve capacity Total Valves Capacity

581.426 924.48 1848.96

kg/h kg/h kg/h

(1)

Worst case: includes max operating case and fire case

See API 521 Table 5

According 5.15.2.2.1 According Table 6 WORST CASE

5.15.2.2.1 equation (6)

See C_0455A_ARI

Type of Equipment Bare Vessel Insulated vessel, with insulation conductance values for fire exposure conditions Btu/hr ft2 ºF 4 2 1 0.67 0.5 0.4 0.33

W/m2 ºK 22.71 11.36 5.68 3.80 2.84 2.27 1.87

F 1

0.3 0.15 0.075 0.05 0.0376 0.03 0.026

Horizontal elipsoides = L*D*Arccos[(D/2-H)/D/2] + 0.6932*D2*Arccos [( 2.797812897

Esférico =

With measures Absent Horizontal Vertical Esférico

Flat end Spherical Ellipsoidal

0.08196721 1.48873705

*D*Arccos[(D/2-H)/D/2] + 0.6932*D2*Arccos [(D/2-H)/D/2]