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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5-20 API RECOMMENDED PRACTICE 581nrh,nis the number of release holes for each release hole size as a function of the storage tankdiameterThinN A is the number of A level inspectionsThinNBis the number of B level inspectionsThinNCis the number of C level inspectionsThinNDis the number of D level inspectionsµlis the dynamic viscosity, (N-s)/m 2 ((lbf-s)/ft 2 )µwis the dynamic viscosity of water at storage or normal operating, (N-s)/m 2 ((lbf-s)/ft 2 )Outage is the numbers of days of downtime required to repair damage to the surrounding equipment,affadaysthOutagenis the number of downtime days to repair damage associated with the n release hole size,dayspsis the soil porosityPlvdikeis the percentage of fluid leaving the dikePonsiteis the percentage of fluid that leaves the dike area but remains on-sitePoffsiteis the percentage of fluid that leaves the dike area, remains off-site and remains out of nearbywaterρlis the liquid density at storage or normal operating conditions, kg/m 3 (lb/ft 3 )ρwis the density of water at storage or normal operating conditions, kg/m 3 (lb/ft 3 )rate is the adjusted or mitigated discharge rate used in the consequence calculation associatedSnwith thethn release hole size, bbl/dayis the allowable stress, MPa (psi)s is the distance to the groundwater underneath the storage tank, m (ft)gwtis the furnished thickness of the component calculated as the sum of the base material andcladding/weld overlay thickness, as applicable, mm (inch)tcis the minimum structural thickness of the component base material, mm (inch)tis the time required for the product to reach the groundwater through a leak in the storage tankglbottom, daystldis the leak detection time, daystminis the minimum required thickness based on the applicable construction code, mm (inch)trdithe furnished thickness, t, or measured thickness reading from previous inspection, only ifthere is a high level of confidence in its accuracy, with respect to wall loss associated withinternal corrosion, mm (inch)vel is the seepage velocity, m/day (ft/day)s,prodWis the discharge rate of the storage tank product through a hole in the course, bbl/dayn

RISK-BASED INSPECTION METHODOLOGY, PART 5—SPECIAL EQUIPMENT 5-21TablesTable 4.1⎯Internal Liner TypesInternal Liner Lining Resistance Expected AgeAlloy Strip Liner Subject to failure at seams 5-15 yearsOrganic Coating—Low QualityImmersion Grade Coating Limited life1-3 years(Spray Applied, to 40 mils)Organic CoatingM—ediumQuality Immersion GradeCoating (Filled, Trowel Applied,Limited life3-5 yearsto 80 mils)Organic Coating—High QualityImmersion Grade Coating(Reinforced, Trowel Applied, ≥Limited life5-10 years80 mils)Thermal Resistance Service:Castable RefractoryPlastic RefractoryRefractory BrickCeramic Fiber RefractoryRefractory/AlloyCombinationThermal Resistance Service:Castable RefractoryCeramic TileGlass LinersAcid BrickSubject to occasional spalling orcollapseLimited life in highly abrasiveserviceComplete protection, subject tofailure due to thermal ormechanical shockPartial protection. The brickprovides thermal protection, butis not intended to keep the fluidaway from the base material1-5 years1-5 years5-10 years10-20 yearsTable 4.2⎯Lining Condition AdjustmentQualitativeConditionPoorAverageGoodDescription Adjustment Multiplier – F LCThe lining has either had previous failures or exhibitsconditions that may lead to failure in the near future.Repairs to previous failures are not successful or are ofpoor quality.The lining is not showing signs of excessive attack byany damage mechanisms. Local repairs may have beenperformed, but they are of good quality and havesuccessfully corrected the lining condition.The lining is in “like new” condition with no signs of attackby any damage mechanisms. There has been no needfor any repairs to the lining.321

5-20 API RECOMMENDED PRACTICE 581

nrh,

n

is the number of release holes for each release hole size as a function of the storage tank

diameter

Thin

N A is the number of A level inspections

Thin

N

B

is the number of B level inspections

Thin

N

C

is the number of C level inspections

Thin

N

D

is the number of D level inspections

µ

l

is the dynamic viscosity, (N-s)/m 2 ((lbf-s)/ft 2 )

µ

w

is the dynamic viscosity of water at storage or normal operating, (N-s)/m 2 ((lbf-s)/ft 2 )

Outage is the numbers of days of downtime required to repair damage to the surrounding equipment,

affa

days

th

Outage

n

is the number of downtime days to repair damage associated with the n release hole size,

days

p

s

is the soil porosity

P

lvdike

is the percentage of fluid leaving the dike

P

onsite

is the percentage of fluid that leaves the dike area but remains on-site

P

offsite

is the percentage of fluid that leaves the dike area, remains off-site and remains out of nearby

water

ρ

l

is the liquid density at storage or normal operating conditions, kg/m 3 (lb/ft 3 )

ρ

w

is the density of water at storage or normal operating conditions, kg/m 3 (lb/ft 3 )

rate is the adjusted or mitigated discharge rate used in the consequence calculation associated

S

n

with the

th

n release hole size, bbl/day

is the allowable stress, MPa (psi)

s is the distance to the groundwater underneath the storage tank, m (ft)

gw

t

is the furnished thickness of the component calculated as the sum of the base material and

cladding/weld overlay thickness, as applicable, mm (inch)

t

c

is the minimum structural thickness of the component base material, mm (inch)

t

is the time required for the product to reach the groundwater through a leak in the storage tank

gl

bottom, days

t

ld

is the leak detection time, days

tmin

is the minimum required thickness based on the applicable construction code, mm (inch)

trdi

the furnished thickness, t, or measured thickness reading from previous inspection, only if

there is a high level of confidence in its accuracy, with respect to wall loss associated with

internal corrosion, mm (inch)

vel is the seepage velocity, m/day (ft/day)

s,

prod

W

is the discharge rate of the storage tank product through a hole in the course, bbl/day

n

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