Civil Engineering Reference
In-Depth Information
TABLE 6.16
Steps in CP Design
Input/Output
Data
Item
Calculation and Equations
Coating Breakdown
Jacket HAT
*
to
3,000 and risers
all depths uncoated at installation
−
0.350
Jacket
3000 to mud line
uncoated at construction
−
0.35
Jacket coating damaged prior to
placement
1.00
Jacket
f
c
(initial) total factor at
placement
0.00
Conductor coating damaged dur-
ing construction
1.00
Coating breakdown factor per RP
1.00
⋅
Average factor
f
c
(average) = a + b
t
f
/2
⋅
f
c
(final) = a + b
t
f
Average Breakdown Factors
⋅
Jacket: HAT to
−
3.0
f
c
(average) = a + b
t
f
/2
0.475
Jacket:
−
3.0 to
−
30.0
Bare
1.0
Jacket:
−
30.0 plus
1.0
Conductors: HAT to
−
3.0
1.0
Conductors:
−
3.0 to
−
30.0
1.0
Conductors:
−
30.0 plus
1.0
Risers: HAT to
−
3.0
0.472
Risers:
−
3.0 to 30.0
0.472
Risers:
−
30.0 plus
0.472
Final Breakdown Factors
Jacket: HAT to
−
3.0
0.6
Jacket:
−
3.0 to
−
30.0
1.0
Jacket:
−
30.0 plus
1.0
Conductors: HAT to
−
3.0
1.0
(Continued)
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