Civil Engineering Reference
In-Depth Information
TABLE 7.13
Relation between Brinell Number and Ultimate Strength
Ultimate
Strength
(MPa)
Ultimate
Strength
(MPa)
Ultimate
Strength
(MPa)
Brinell
Reading
Brinell
Reading
Brinell
Reading
240
795
180
596
135
447
234
775
176
583
130
431
228
755
172
570
125
414
222
735
169
560
120
397
216
715
162
537
115
381
210
696
159
527
110
364
205
679
156
517
105
348
200
662
153
507
100
331
195
646
150
497
95
315
190
629
145
480
90
298
185
613
140
464
85
281
the deck and to prevent any work on the deck above. Obviously, this solution
may not be the best for another platform from an economic and business
perspective.
7.8 CASE STUDY: PLATFORM FAILURE
As already mentioned, most platforms worldwide are more than 30 years old.
An integrity management system has been developed and implemented based
on industrial practice. The role of integrity management is to perform assess-
ment of existing structures based on API RP2A.
In general, API RP2A is tailored for platforms in the Gulf of Mexico. For
fixed offshore structures elsewhere, the code needs to be modified and adapted
for the platform location. The definition of risk for the structure is the probabil-
ity of failure multiplied by the consequences of failure. Therefore, the risk is
based on technical determination of the probability of failure and the business
and economic aspects of the consequences.
In real life, this approach may need to be changed when dealing with the
offshore structure maintenance plan, because, although the structural engineers
should focus on the probability of failure, the management is focused on risk;
therefore, you may have to ignore a remedial action for a structure with high
probability of failure because it has a very low consequence.
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