API RP 581 - 3rd Ed.2016 - Add.2-2020 - Risk-Based Inspection Methodology

RISK-BASED INSPECTION METHODOLOGY, PART 5—SPECIAL EQUIPMENT 5-23
Release Hole
Number
Table 4.4M⎯Release Hole Sizes and Areas⎯Storage Tank Courses
Release Hole Size
Range of Hole
Diameters
(mm)
Release Hole Diameter
(mm)
1 Small 0 – 3.175 d
1
= 3.175
2 Medium > 3.175 – 6.35 d
2
= 6.35
3 Large > 6.35 – 50.8 d
3
= 50.8
4 Rupture > 50.8 4
1000
d
D tank
⎛ ⎞
= ⎜ ⎟
⎝ 4 ⎠
Fluid
Table 4.5⎯Fluids and Fluid Properties for Storage Tank Consequence Analysis
Level 1
Consequence
Analysis
Representative
Fluid
Molecular Weight
Liquid Density
(lb/ft 3 )
Liquid Dynamic
Viscosity
(lbf-s/ft 2 )
Gasoline C6-C8 100 42.702 8.383E-05
Light Diesel Oil C9-C12 149 45.823 2.169E-05
Heavy Diesel Oil C13-C16 205 47.728 5.129E-05
Fuel Oil C17-C25 280 48.383 7.706E-04
Crude Oil C17-C25 280 48.383 7.706E-04
Heavy Fuel Oil C25+ 422 56.187 9.600E-04
Heavy Crude Oil C25+ 422 56.187 9.600E-04
Table 4.5M⎯Fluids and Fluid Properties for Storage Tank Consequence Analysis
Fluid
Level 1
Consequence
Analysis
Representative
Fluid
Molecular Weight
Liquid Density
(kg/m 3 )
Liquid Dynamic
Viscosity
(N-s/m 2 )
Gasoline C6-C8 100 684.018 4.01E-03
Light Diesel Oil C9-C12 149 734.011 1.04E-03
Heavy Diesel Oil C13-C16 205 764.527 2.46E-03
Fuel Oil C17-C25 280 775.019 3.69E-02
Crude Oil C17-C25 280 775.019 3.69E-02
Heavy Fuel Oil C25+ 422 900.026 4.60E-02
Heavy Crude Oil C25+ 422 900.026 4.60E-02