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

3-56 API RECOMMENDED PRACTICE 581
Table 4.8M—Component Damage Flammable Consequence Equation Constants
Continuous Releases Constants
Instantaneous Releases Constants
Fluid
Fluid Type
Autoignition Not Likely
(AINL-CONT)
Autoignition Likely
(AIL-CONT)
Autoignition Not Likely
(AINL-INST)
Autoignition Likely
(AIL-INST)
Gas Liquid Gas Liquid Gas Liquid Gas Liquid
a b a b a b a b a b a b a b a b
C1-C2 TYPE 0 8.669 0.98 55.13 0.95 6.469 0.67 163.7 0.62
C3-C4 TYPE 0 10.13 1.00 64.23 1.00 4.590 0.72 79.94 0.63
C5 TYPE 0 5.115 0.99 100.6 0.89 62.41 1.00 2.214 0.73 0.271 0.85 41.38 0.61
C6-C8 TYPE 0 5.846 0.98 34.17 0.89 63.98 1.00 103.4 0.95 2.188 0.66 0.749 0.78 41.49 0.61 8.180 0.55
C9-C12 TYPE 0 2.419 0.98 24.60 0.90 76.98 0.95 110.3 0.95 1.111 0.66 0.559 0.76 42.28 0.61 0.848 0.53
C13-C16 TYPE 0 12.11 0.90 196.7 0.92 0.086 0.88 1.714 0.88
C17-C25 TYPE 0 3.785 0.90 165.5 0.92 0.021 0.91 1.068 0.91
C25+ TYPE 0 2.098 0.91 103.0 0.90 0.006 0.99 0.284 0.99
Pyrophoric TYPE 1 2.419 0.98 24.60 0.90 76.98 0.95 110.3 0.95 1.111 0.66 0.559 0.76 42.28 0.61 0.848 0.53
Aromatics TYPE 1 3.952 1.097 21.10 0 80.11 1.055 1.804 0.667 14.36 0 83.68 0.713 143.6 0
Styrene TYPE 1 3.952 1.097 21.10 0 80.11 1.055 1.804 0.667 14.36 0 83.68 0.713 143.6 01.00
Water TYPE 0
Steam TYPE 0
Acid/Caustic-LP TYPE 0
Acid/Caustic-MP TYPE 0
Acid/Caustic-HP TYPE 0
Methanol TYPE 1 0.005 0.909 340.4 0.934 4.425 0.667 0.363 0.900
H2 TYPE 0 13.13 0.992 86.02 1.00 9.605 0.657 216.5 0.618
H2S TYPE 0 6.554 1.00 38.11 0.89 22.63 0.63 53.72 0.61
HF TYPE 0
CO TYPE 1 0.040 1.752 10.97 0.667
DEE TYPE 1 9.072 1.134 164.2 1.106 67.42 1.033 976.0 0.649 24.51 0.667 0.981 0.919 1.090 0.919
PO TYPE 1 3.277 1.114 257.0 0.960 10.32 0.667 0.629 0.869
EEA TYPE 1 0 1.035 23.96 0 1.261 0.667 14.13 0
EE TYPE 1 2.595 1.005 35.45 0 6.119 0.667 14.79 0
EG TYPE 1 1.548 0.973 22.12 0 1.027 0.667 14.13 0
EO TYPE 1 6.712 1.069 21.46 0.667