A Level II Inspection Survey, encompasses the Level I survey, and is comprised of 17 possible surveys. It’s basically a documented walkthrough of the above-water, and a Diver Swim-By of the below-water structural Platform Components.
Not all of the surveys listed below, are required in a Post Hurricane Platform Survey. Although, because they are highly recommended, they are usually still performed. For purposes of clarification, Italic font denotes the portions of a Standard Level II Inspection Survey, that are recommended, but are technically not required.
Photographic, and/or Video documentation of the Inspection will be performed during the entire Survey.
Above the Waterline:
1. Topside Survey - Visual Inspection (V.I.) of all Platform structural components above the waterline. This includes the Platform Jacket Legs, Bracing Members, Risers, Access Stairwells, Main Decks, Machinery, Piping, Building Structures, and Conductor Bays.
2. Basic Cathodic Protection Survey – This is what is referred to as a Cell Drop. A “Drop Cell” is lowered down the outside of the Structure, at each Leg, and Platform Face. Readings are taken every 10’ of water depth. (When performing a Level II Survey, Divers will usually perform this Task)
Below the Waterline:
1. Splash-zone Survey – Visual Inspection of all components at the waterline, as well as those that extend below the Water-line.
2. Riser, and/or J-Tube Survey – from the splash-zone, to their termination point, or to the Mudline. Including the Riser Coating, and Splash-Tron Coating.3. Riser Clamp / Attachment Survey
3. Riser Clamp / Attachment Survey – This includes all Jacket Leg/Member attachments.
4. Conductor Survey – This includes recording of integrity, movement wear, or damage within the Bell Guides
5. Well Bay Survey – This includes all supports of the Well Bay, as well as empty slots, and debris.
6. Conduit Survey – This includes all Electrical, Grouting, Communication Conduits, that can be identified as such.
(Below the Waterline continued)
7. Cathodic Protection Survey – Readings taken from the Surface to Bottom, at every 10’ of water depth, and at each Anode. These readings are taken at each Jacket Leg, and each Platform Face.
8. Anode Survey – Anodes are visually inspected, recording the location, type of Anode, amount of depletion, amount of Marine Growth, and the condition of the attachments. The Anodes are physically measured, and C.P. readings are taken.
9. Pump/Sump Survey – This includes Conduit, Intake/Discharge Piping, and attacing Clamps.
10. Marine Growth Survey – Record the Type and density of the Marine Growth from the Waterline to the Bottom.
11. Jacket Leg Pile Survey – Locate and Inspect the inner Drive Piles within the Platform Jacket. Divers may be required to physically remove mud, shells or debris from the area to perform this survey.
12. Debris Survey – Debris within the Structure, and on the Sea Bottom inside the Structure/
13. Bottom Survey – Survey the sea bottom outside, and inside the Structure, out away from the Jacket for a minimum of 25’.