DNV DNV-RP-B401 [ Active ]

This recommended practice specifies requirements for the cathodic protection of permanently installed offshore structures associated with the production of oil and gas. The following topics are covered:

— procedures for the execution and documentation of marine structure GACP design using aluminium- or zinc-based galvanic anodes

— default design parameters for GACP design

— requirements for the manufacturing of galvanic anodes for marine structures with an emphasis on quality control

— requirements for the installation of anodes on marine structures

— advice on the inspection, monitoring and retrofit of GACP systems.

The document does not include:

— potential attenuation calculations related to a voltage drop in the steel structure and in the electrolyte remotely from the anodes

— the detailed design of anode fastening devices for structural integrity

— considerations related to safety and environmental hazards associated with galvanic anode manufacture and installation.