Risk-Based Inspection Technique - Offshore Structures: Design, Construction and Maintenance - page 622

TABLE 8.36 Anode Condition

Grade of Anode Anode Depletion (%)

Grade 4 100 (red cell)

Grade 3 > 50 (yellow cell)

Grade 2 < 50 (yellow cell)

Grade 1 < 10 (green cell)

TABLE 8.37 Cathodic Protection (CP) Readings

CP Readings (mV) Protection Condition

< 850 Unprotected (red cell)

850 - 900 Marginal protection (yellow cell)

900 - 950 Satisfactory (yellow cell)

950 - 1000 Good (yellow cell)

> 1000 Very good (green cell)

Soil data and metocean data should be available as well. So the required
information includes:

Deck extensions

●

New conductors or risers

●

Additional facilities with their weights and locations ●

Soil data ●

Metocean data.

●

8.6.2 Structure Assessment
Structure assessment is discussed in detail in Chapter 7 , but, in general, structure
assessment uses different methods according to the structure ' s condition and the

available data.

Simple Methods
Simple methods for assessment are used instead of the more complex and time-
consuming platform-specific analyses. Simple methods are typically used for a
platform in a certain class where prior studies are available or when previous
analyses are available. Guidance for simple methods is provided here. If