life time extension and the business case - ptil
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Business Case
New treaths
New knowledge
System
description
Production
forcast
Design BasisExternal loads
- Environmental
load
- 3rd party loads
Risk assessmentFuture Operation
Determine Condition
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Assessment / Studies
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New Design Life
Ext Service LifeOrg Service Life
LTE project
Operational
Inspection
Modification
Time
Mitig
atio
ns
Org Design Life
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- 20” pipeline – carbon steel
- 18 years design life – expired in 2009
- Operated from 1991 – 2002
- Gas condensate
- Injection of methanol (MeOH) and
corrosion inhibitor
- Corrosion allowance 3 and 5 mm
- Designed according to DNV’81
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40
50
60
0 10 20 30 40 50
KP from Oseberg [m]
Te
mp
era
ture
[°C
]
New service Old Service
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Parameter Unit Value
Lateral buckling At KP 44
Anode consumption % 0 - 30
Free spans % 44
Longest span m 40-50m
Free spans % 44
Other observations Anode pitting from KP ~
44 000 m –
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ER- PROBER
SYSTEM 30, OSA
0
50
100
150
200
250
1993
-Jan
1993
-Mar
1993
-Jul
1993
-Sep
1993
-Nov
1994
-Jan
1994
-May
1994
-Aug
1995
-Jul
1995
-Sep
1995
-Oct
1996
-Jan
1996
-Mar
1996
-Jul
1996
-Nov
1997
-Jul
1996
-Nov
1998
-Mar
1998
-Jul
1998
-Dec
2000
-Feb
2000
-Jun
2000
-Oct
2001
-Feb
2001
-Oct
2002
-Feb
2002
-Jun
2002
-Oct
2003
-Feb
Accu
mu
lative
co
rro
sio
n [µ
m]
30-CE-001 30-CE-002 30-CE-003
0.07 mm/year
Tag – WL Coupons Unit May 1994 June 1999 June 2001 June
2001a
30-CE-1001 mm/year 0.00 0.002
30-CE-1002 mm/year 0.00 0.002 0.001
30-CE-1003 mm/year 0.00 0.001 0.003 0.01
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