Civil Engineering Reference
In-Depth Information
TABLE 8.31
API SIM Definitions of Requirements for Survey, by Level
Subsea Survey Level
Consequence Categorization
Low
Medium
High
Level II
General visual survey
•
•
•
Damage survey
•
•
•
Debris survey
•
•
•
Marine growth survey
•
•
•
Scour survey
•
•
•
Anode survey
•
•
•
Cathodic potential
•
•
•
Riser/J-tubes/caissons
•
•
•
Level III
Visual corrosion
•
•
Flooded member detection
•
•
Weld/joint close Visual
•
•
Level IV
Weld/joint nondestructive
test NDT
•
•
Wall thickness
•
Measurement of the mean water surface elevation, as installed, with appro-
priate correction for tide and sea-state conditions.
●
Tilt and platform orientation.
●
Riser and tube soil contact.
●
Scour survey (seabed profile).
●
8.4.3 Routine Underwater Inspection Scope of Work
Routine underwater platform inspections are required to detect and properly
measure and record any platform defects, deterioration or anomalies that affect
the structural integrity and performance. Platform deterioration may include
excessive corrosion of welds and members, weld/joint damage (including
overload and fatigue damage) and mechanical damage in the form of dents,
holes, bows and gouges. Platform anomalies may include a non-operating or
ineffective corrosion protection system, scour, seafloor instability, hazardous
or detrimental debris and excessive marine growth.
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