Fitness for Service Assessment
Assessment Type API 579 PART 5 LEVEL 1
Description
Standard
API 579-1/ASME FFS-1, June, 2016
Assessment of Local Metal Loss - Straight Pipe
Facility
Client
Item ID
Client Rep
Item CML
Item Description PAUT-B & GWT
ASSESSMENT INPUTS
Conditions
External
Defect Location
T=
100
Operating Temperature (°F)
Design
Assessment Condition
P=
1480
Pressure (psi)
B31.3
Piping Class
Material
Design Factors
Ec =
S=
20000
Allowable Stress (psi)
EL =
tSL =
Do =
8.625
Outside Diameter (in)
RSFa =
A106 Gr B
tnom =
Inspection Data
s=
Material
0.5
Fabricated Thickness (in)
1.50
Pit Length Longitudinal Plane (in)
YB31 =
1
Circumferential Weld Joint Efficiency
1
Longitudinal Weld Joint Efficiency
0
Thickness Required for Supplemental Loads (in)
0.9
Allowable Remaining Strength Factor
0.4
Material Yb31 Value
trd =
0.483
Uniform Thickness Away From Metal Loss (in)
0.017
0.02
Uniform Metal Loss (in)
Future Corrosion Allowance (in)
0.02
Future Corrosion Allowance - Metal Loss (in)
2243
Circumferential MAWP
MAWP =
4698
Longitudinal MAWP
MAWP =
2243
MAWP
c=
Lmsd =
27.00
3.40
Pit Length Circumferential Plane (in)
Distance to Nearest Discontinuity (in)
tmm =
0.241
Minimum Measured Thickness (in)
LOSS =
FCA =
FCAml =
0.4630
Corroded thickness away from LTA
Step 7
MAWPC =
CALCULATED VALUES
Step 2
tC =
L
Step 3
Above
See Inspection Data for values
Step 4
Step 5
Step 8
Rt =
0.4773
Remaining Thickness Ratio
λ=
1.0209
Longitudinal Flaw Length Parameter
Mt =
1.2067
Rt-min =
0.6066
Flaw Size Criteria
No - Use RSF
OK
OK
Rt ≥ 0.2
tmm-FCAml ≥ 0.05"
OK
Lmsd ≥ 1.8√(Dtc)
RSF =
MAWPr =
Folias Factor
Minimum Acceptable Rt Value
Rt > Rt-min
0.8420
Remaining Strength Factor
No - Use MAWPr RSF ≥ RSFa
2099
Reduced MAWP (psi)
Step 6
N/A
RESULTS
ACCEPTABLE
The level 1 assessment criteria is satisfied, fit for continued operation at assessment conditions.
Notes
Assumes original 100% RT weld quality inspection
Evaluated By
Position
Position
Date
Date
THIS CONFIDENTIAL REPORT IS FURNISHED FOR THE USE OF THE CLIENT ONLY. THERE ARE NO IMPLIED OR EXPRESS WARRANTIES OR GUARANTEES OF ANY KIND IN CONNECTION WITH THIS INSPECTION. THE ITEMS
INSPECTED WERE IN THE REPORTED CONDITION LISTED ABOVE AT THE TIME OF THE INSPECTION ONLY. FURTHER DISCLAIMED IS ANY LIABILITY FOR ANY DAMAGE OR DEFECTS NOT FOUND DURING THIS INSPECTION.