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

RISK-BASED INSPECTION METHODOLOGY, PART 5—SPECIAL EQUIPMENT 5-11
• Business interruption costs in accordance to Section 4.12.4
• Potential Injury costs in accordance to Section 4.12.5
The storage tank Environmental financial consequence for courses is calculated following the steps provided
below.
a) STEP 6.1 – Determine the following parameters.
P
lvdike – percentage of fluid leaving the dike
P
onsite – percentage of fluid that leaves the dike area but remains on-site
P – percentage of fluid that leaves the dike area but does not enter nearby water
offsite
b) STEP 6.2 – Determine the environmental sensitivity used to establish C
indike , Css − onsite , Css −
, and
offsite
C
water from Table 4.6.
c) STEP 6.3 – Determine the probability weighted total barrels of fluid released by leakage, Bbl
released .
Bbl
leak
release
=
3
leak
∑( Bbln
⋅ gffn)
n=
1
gff
tot
(5.19)
d) STEP 6.4 – Calculate the total barrels of fluid within the dike from leakage,
Bbl
leak
indike
, the total barrels of
leak
fluid in the on-site surface soil, Bblss −
, the total barrels of fluid in the off-site surface soil,
onsite
and the total barrels of fluid in that reach water,
respectively.
Bbl
⎛ P ⎞
= Bblrelease
⎜1−
⎟
⎝ 100 ⎠
leak leak lvdike
indike
leak
Bblss − offsite
,
leak
Bbl , using Equation (5.20) through Equation (5.23),
water
(5.20)
leak Ponsite
leak leak
Bblss− onsite
= ( Bblrelease − Bblindike
)
(5.21)
100
P
leak offsite leak leak leak
Bblss−offsite = ( Bblrelease −Bblindike − Bblss−onsite
)
100
(5.22)
leak leak leak leak leak
Bblwater = Bblrelease − ( Bblindike + Bblss−onsite + Bblss−offsite
)
(5.23)
e) STEP 6.5 – Calculate the financial environmental cost from leakage,
leakage
FC .
environ
FC = Bbl ⋅ C + Bbl ⋅ C + Bbl ⋅ C + Bbl ⋅ C (5.24)
leak leak leak leak leak
environ indike indike ss−onsite ss−onite ss−offsite ss−offite water water
f) STEP 6.6 – Determine the total barrels of fluid released by a course rupture,
Bbl
Bbl
⋅ gff
rupture
Bbl .
release
rupture
rupture n
4
release
= (5.25)
gfftot