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

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RISK-BASED INSPECTION METHODOLOGY, PART 3—CONSEQUENCE OF FAILURE METHODOLOGY 3-57Table 4.9—Personnel Injury Flammable Consequence Equation ConstantsContinuous Releases ConstantsInstantaneous Releases ConstantsFluidFluidTypeAutoignition Not Likely(AINL-CONT)Autoignition Likely(AIL-CONT)Autoignition Not Likely(AINL-INST)Autoignition Likely(AIL-INST)Gas Liquid Gas Liquid Gas Liquid Gas Liquida b a b a b a b a b a b a b a bC1-C2 TYPE 0 110.0 0.96 745.0 0.92 79.0 0.67 3100 0.63C3-C4 TYPE 0 125.2 1.00 836.7 1.00 57.72 0.75 1769 0.63C5 TYPE 0 62.05 1.00 1545 0.89 811.0 1.00 28.45 0.76 4.34 0.85 959.6 0.63C6-C8 TYPE 0 68.0 0.96 516.0 0.89 828.7 1.00 1315 0.92 26.72 0.67 12.7 0.78 962.8 0.63 224.0 0.54C9-C12 TYPE 0 29.0 0.96 373.0 0.89 981.0 0.92 1401 0.92 13.0 0.66 9.5 0.76 988.0 0.63 20.0 0.54C13-C16 TYPE 0 183.0 0.89 2850 0.90 1.3 0.88 26.0 0.88C17-C25 TYPE 0 57.0 0.89 2420 0.90 0.32 0.91 16.0 0.91C25+ TYPE 0 33.0 0.89 1604 0.90 0.081 0.99 4.1 0.99Pyrophoric TYPE 1 29.0 0.96 373.0 0.89 981.0 0.92 1401 0.92 13.0 0.66 9.5 0.76 988.0 0.63 20.0 0.54Aromatics TYPE 1 64.14 0.963 353.5 0.883 1344 0.937 487.7 0.268 18.08 0.686 0.14 0.935 512.6 0.713 1.404 0.935Styrene TYPE 1 64.14 0.963 353.5 0.883 1344 0.937 487.7 0.268 18.08 0.686 0.14 0.935 512.6 0.713 1.404 0.935Water TYPE 0Steam TYPE 0Acid/Caustic-LP TYPE 0 2699.5 0.2024 2699.5 0.2024Acid/Caustic-MP TYPE 0 3366.2 0.2878 3366.2 0.2878Acid/Caustic-HP TYPE 0 6690 0.2469 6690 0.2469Methanol TYPE 1 0.0164 1.0083 4483.7 0.9015 37.71 0.6878 6.2552 0.8705H2 TYPE 0 165.0 0.933 1117 1.00 118.5 0.652 4193 0.621H2S TYPE 0 52.0 1.00 375.0 0.94 271.0 0.63 1253 0.63HF TYPE 0CO TYPE 1 27.0 0.991 105.3 0.692DEE TYPE 1 128.1 1.025 971.9 1.219 1182 0.997 2658 0.864 199.1 0.682 47.13 0.814 821.7 0.657 52.36 0.814PO TYPE 1 38.76 1.047 1955 0.840 83.68 0.682 15.21 0.834EEA TYPE 1 0.017 0.946 443.1 0.835 11.41 0.687 0.153 0.924EE TYPE 1 35.56 0.969 46.56 0.800 162.0 0.660 0.152 0.927EG TYPE 1 25.67 0.947 324.7 0.869 8.971 0.687 0.138 0.922EO TYPE 1 49.43 1.105 220.8 0.665

3-58 API RECOMMENDED PRACTICE 581Table 4.9M—Personnel Injury Flammable Consequence Equation ConstantsContinuous Releases ConstantsInstantaneous Releases ConstantsFluidFluidTypeAutoignition Not Likely(AINL-CONT)Autoignition Likely(AIL-CONT)Autoignition Not Likely(AINL-INST)Autoignition Likely(AIL-INST)Gas Liquid Gas Liquid Gas Liquid Gas Liquida b a b a b a b a b a b a b a bC1-C2 TYPE 0 21.83 0.96 143.2 0.92 12.46 0.67 473.9 0.63C3-C4 TYPE 0 25.64 1.00 171.4 1.00 9.702 0.75 270.4 0.63C5 TYPE 0 12.71 1.00 290.1 0.89 166.1 1.00 4.820 0.76 0.790 0.85 146.7 0.63C6-C8 TYPE 0 13.49 0.96 96.88 0.89 169.7 1.00 252.8 0.92 4.216 0.67 2.186 0.78 147.2 0.63 31.89 0.54C9-C12 TYPE 0 5.755 0.96 70.03 0.89 188.6 0.92 269.4 0.92 2.035 0.66 1.609 0.76 151.0 0.63 2.847 0.54C13-C16 TYPE 0 34.36 0.89 539.4 0.90 0.242 0.88 4.843 0.88C17-C25 TYPE 0 10.70 0.89 458.0 0.90 0.061 0.91 3.052 0.91C25+ TYPE 0 6.196 0.89 303.6 0.90 0.016 0.99 0.833 0.99Pyrophoric TYPE 1 5.755 0.96 70.03 0.89 188.6 0.92 269.4 0.92 2.035 0.66 1.609 0.76 151.0 0.63 2.847 0.54Aromatics TYPE 1 12.76 0.963 66.01 0.883 261.9 0.937 56.00 0.268 2.889 0.686 0.027 0.935 83.68 0.713 0.273 0.935Styrene TYPE 1 12.76 0.963 66.01 0.883 261.9 0.937 56.00 0.268 2.889 0.686 0.027 0.935 83.68 0.713 0.273 0.935HF TYPE 0Water TYPE 0Acid/Caustic TYPE 0 194.280 0.2024 194.280 0.2024Acid/Caustic TYPE 0 392.588 0.2878 392.588 0.2878Acid/Caustic TYPE 0 755.408 0.2469 755.408 0.2469Steam TYPE 0Methanol TYPE 1 0 1.008 849.9 0.902 6.035 0.688 1.157 0.871H2 TYPE 0 32.05 0.933 228.8 1.00 18.43 0.652 636.5 0.621H2S TYPE 0 10.65 1.00 73.25 0.94 41.43 0.63 191.5 0.63CO TYPE 1 5.491 0.991 16.91 0.692DEE TYPE 1 26.76 1.025 236.7 1.219 241.5 0.997 488.9 0.864 31.71 0.682 8.333 0.814 128.3 0.657 9.258 0.814PO TYPE 1 8.239 1.047 352.8 0.840 13.33 0.682 2.732 0.834EEA TYPE 1 0 0.946 79.66 0.835 1.825 0.687 0.030 0.924EE TYPE 1 7.107 0.969 8.142 0.800 25.36 0.660 0.029 0.927EG TYPE 1 5.042 0.947 59.96 0.869 1.435 0.687 0.027 0.922EO TYPE 1 11.00 1.105 34.70 0.665

RISK-BASED INSPECTION METHODOLOGY, PART 3—CONSEQUENCE OF FAILURE METHODOLOGY 3-57

Table 4.9—Personnel Injury 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 0 110.0 0.96 745.0 0.92 79.0 0.67 3100 0.63

C3-C4 TYPE 0 125.2 1.00 836.7 1.00 57.72 0.75 1769 0.63

C5 TYPE 0 62.05 1.00 1545 0.89 811.0 1.00 28.45 0.76 4.34 0.85 959.6 0.63

C6-C8 TYPE 0 68.0 0.96 516.0 0.89 828.7 1.00 1315 0.92 26.72 0.67 12.7 0.78 962.8 0.63 224.0 0.54

C9-C12 TYPE 0 29.0 0.96 373.0 0.89 981.0 0.92 1401 0.92 13.0 0.66 9.5 0.76 988.0 0.63 20.0 0.54

C13-C16 TYPE 0 183.0 0.89 2850 0.90 1.3 0.88 26.0 0.88

C17-C25 TYPE 0 57.0 0.89 2420 0.90 0.32 0.91 16.0 0.91

C25+ TYPE 0 33.0 0.89 1604 0.90 0.081 0.99 4.1 0.99

Pyrophoric TYPE 1 29.0 0.96 373.0 0.89 981.0 0.92 1401 0.92 13.0 0.66 9.5 0.76 988.0 0.63 20.0 0.54

Aromatics TYPE 1 64.14 0.963 353.5 0.883 1344 0.937 487.7 0.268 18.08 0.686 0.14 0.935 512.6 0.713 1.404 0.935

Styrene TYPE 1 64.14 0.963 353.5 0.883 1344 0.937 487.7 0.268 18.08 0.686 0.14 0.935 512.6 0.713 1.404 0.935

Water TYPE 0

Steam TYPE 0

Acid/Caustic-LP TYPE 0 2699.5 0.2024 2699.5 0.2024

Acid/Caustic-MP TYPE 0 3366.2 0.2878 3366.2 0.2878

Acid/Caustic-HP TYPE 0 6690 0.2469 6690 0.2469

Methanol TYPE 1 0.0164 1.0083 4483.7 0.9015 37.71 0.6878 6.2552 0.8705

H2 TYPE 0 165.0 0.933 1117 1.00 118.5 0.652 4193 0.621

H2S TYPE 0 52.0 1.00 375.0 0.94 271.0 0.63 1253 0.63

HF TYPE 0

CO TYPE 1 27.0 0.991 105.3 0.692

DEE TYPE 1 128.1 1.025 971.9 1.219 1182 0.997 2658 0.864 199.1 0.682 47.13 0.814 821.7 0.657 52.36 0.814

PO TYPE 1 38.76 1.047 1955 0.840 83.68 0.682 15.21 0.834

EEA TYPE 1 0.017 0.946 443.1 0.835 11.41 0.687 0.153 0.924

EE TYPE 1 35.56 0.969 46.56 0.800 162.0 0.660 0.152 0.927

EG TYPE 1 25.67 0.947 324.7 0.869 8.971 0.687 0.138 0.922

EO TYPE 1 49.43 1.105 220.8 0.665

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