Civil Engineering Reference
In-Depth Information
Chapter 8
Risk-Based Inspection Technique
8.1 INTRODUCTION
This chapter presents risk assessment methodology based on current industrial
practice. In addition, methods of subsea inspection and methods for implementing
inspection programs are illustrated at every inspection level.
The implementation of a structure integrity management (SIM) system is
presented in
Figure 8.1
. The first step is to collect and evaluate all available data
about all the offshore structures in the fleet. Structures should include supports,
such as flare, and bridges connecting platforms if they exist. In general, all avail-
able data should be on hand, and, if there are missing data that are critical, a special
survey or study can be performed to obtain the data.
The data should include:
Year of design
●
Year of construction
●
Water depth
●
Calculation report
●
Construction drawings
●
As-built drawings
●
Management of change records, additional risers, conductors, equipment or
deck extensions or other additional loads or changes of configuration
●
Number of risers and conductors
●
Pile depth and driving records
●
Existing metocean data
●
Last inspection findings
●
Soil report
●
Any previous structural study performed
●
Records of any accidents or fires or other events affecting the structure.
●
s integrity and to obtain its fitness
for service. Also in this phase, the data can be used to define the structure
The next step is to evaluate the structure
'
s risk
assessment ranking. Based on the risk rankings for all offshore structures in the
fleet, the overall inspection philosophy, strategy and plan for all the structures
can be defined.
'
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