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

5-10 API RECOMMENDED PRACTICE 581
rupture
f) STEP 5.6 – Calculate the release volume from a rupture, Bbl , for each hole size using Equation
n
(5.17) based on the available volume, Bbl , from STEP 4.4.
avail,
n
Bbl
rupture
n
= Bbl
(5.17)
avail,
n
rupture
g) STEP 5.7 – Calculate the mass from a rupture, mass , for each hole size using Equation (5.18)
n
rupture
based on the available volume, Bbl , from STEP 5.6.
n
mass
rupture
n
= Bbl
(5.18)
rupture
n
Determine Flammable and Explosive Consequences for Storage Tank Courses
Flammable and explosive consequences for storage tanks courses are determined using a similar approach
as implemented for Level 1 and 2 consequence analysis.
Calculation of Flammable and Explosive Consequences
The step-by-step procedure for determining the flammable and explosive consequences are in accordance
with the level of consequence analysis, see Part 3, Section 4.8 for Level 1 analysis and Part 3, Section 5.8.9
for Level 2 COF analysis.
Determine Toxic Consequences for Storage Tank Courses
Toxic consequences for storage tank courses are determined using a similar approach as implemented for
Level 1 and 2 consequence analysis.
Calculation of Toxic Consequences for Storage Tank Courses
The step-by-step methodology for determining the toxic consequences are in accordance with the Level 1
and 2 consequence analysis; see Part 3, Section 4.9 and Part 3, Section 5.9.8.
Determine Non-Flammable, Non-Toxic Consequences
Non-flammable, non-toxic consequences are not determined for storage tanks.
Determine Component Damage and Personnel Injury Consequences for Storage Tank
Courses
Flammable and explosive consequences for storage tank courses are determined using a similar approach
as implemented for Level 1 and 2 consequence analysis.
Calculation for Component Damage and Personnel Injury Consequences
The step-by-step procedure for determining the flammable and explosive consequences are in accordance
with the Level 1 COF Part 3, Section 4.8 and Level 2 COF in Part 3, Section 5.11.5.
Determine the Financial Consequences
The financial consequence is determined in accordance with the Level 1 COF in Part 3, Section 4.12.
Calculation of Storage Tank Course Financial Consequence
The step-by-step procedure for estimating the financial consequence is in accordance with Section 4.12.7,
except when calculating the environmental financial consequence. The storage tank course financial
consequence can be calculated following the approach in Sections defined below using the hole sizes
defined in Table 4.8.
• Component Damage Cost in accordance to Section 4.12.2
• Damage cost to surrounding equipment in accordance with Section 4.12.3