PT PJ-TEK MANDIRI
CALCULATION SHEET
ASME B31.4
OWNER
:
PT Pertamina EP Regional 2 Zona 7
SUBJECT
:
Existing / New Installation (Replacement)
DESCRIBE
:
Migas PLO Certification
PIPELINE
:
Pipeline 12” XAP Process Platform to Terminal Balongan
PIPELINE DATA
Design Press.
(P) :
250
psig
:
250
psig
Design Temperature
(T) :
200
o
Design Factor
(F) :
0.72
Longitudinal Joint Factor
(E) :
1.00
Temp. Derating Factor
(T) :
1.00
MAOP
F
Year Built
:
2013
Date of inspection
:
2023
Last Inspection
:
2020
Year of Recertification (Next Insp.)
:
4
Material
:
93.33
/
API 5L Grade X52 PSL-2 MO
(S)
:
52,000
psig
Diameter
(OD)
:
inch
:
323.9
mm
Nominal Thickness
( tnom ) :
12.750
0.500
inch
:
12.70
mm
Previous Thickness
( tprev ) :
0.330
inch
:
8.38
mm
Act Thickness
( tact )
:
0.311
inch
:
7.90
mm
:
#VALUE!
Inch
( CA )
C
years
Yield Strength
Corrosion Allowance
o
(dari hasil UT onshore)
CALCULATION
Minimum Thickness
Required Thickness of Pipeline :
treq =
Result :
P.D
2.S(F.E.YS)
=
250
2x
0.72
x
x
1.00
12.750
x
52,000
=
0.043
inch
=
1.080
mm
The selected thickness is Satisfactory
Page 1 of 2
PT PJ-TEK MANDIRI
CALCULATION SHEET
ASME B31.4
OWNER
:
PT Pertamina EP Regional 2 Zona 7
SUBJECT
:
Existing / New Installation (Replacement)
DESCRIBE
:
Migas PLO Certification
PIPELINE
:
Pipeline 12” XAP Process Platform to Terminal Balongan
Allowable Pressure (P)
P
2.S.tact
=
=
x
D
2 x
52,000
x
0.311
x
12.750
=
1,826
psig
=
128.38
kg/cm2g
Pressure Limit For Flange =
Conclusion
MAOP used
F.E.T
=
1315
psig
92.44
kg/cm2g
x
1.00
x 1.00
Satisfactory
psig
250
0.72
Corrosion Rate for Pipeline
Long Term Corrotion Rate
tint - tact
CR =
years between tint and tact
0.500
=
Short Term Corrotion Rate
tprev - tact
CR =
years between tprev and tact
-
0.311
10
0.330
=
-
0.311
3
Conclusion
Corrosion rate (CR)
=
0.006
inch/year
=
0.160
mm/year
=
0.019
inch/year
=
0.480
mm/year
=
0.006
inch/year
=
0.160
mm/year
Remaining Life (RL)
Remaining Life Pipeline
=
tact - treq
CR
=
0.311
-
0.006
0.043
=
42.6
years
Page 2 of 2