1.Certification: DNV, BV, ABS, CCS, Velosi, Moody, etc 2.Specification and Dimension: meet virous requirements Standards of Product:DNV-RP-B401 Cathodic Protection DesignNORSOK M-503 Cathodic ProtectionNACE RP-01-76 Recommended Practice - Control of Corrosion on Steel Fixed Off-shore Platforms Associated with Petroleum ProductionNACE RP-03-87 Metallurgical and inspection requirements for cast ...