ISO 20313-2018 PDF

Full title and description

ISO 20313:2018 — Ships and marine technology — Cathodic protection of ships. This international standard specifies protection criteria and gives recommendations for the design and specification of cathodic protection (both impressed current and galvanic anode systems) for ship hulls and ballast tanks, and addresses protection of commonly encountered hull fixtures and submerged components.

Abstract

ISO 20313:2018 defines the objectives, design basis, performance criteria and practical recommendations for the application of cathodic protection to the immersed sections of ship hulls and tanks. It covers impressed current and sacrificial (galvanic) anode systems, current demand calculations, system components, monitoring and commissioning, electrical continuity, and considerations for both coated and bare hulls. The standard applies to self‑propelled vessels fabricated principally from carbon, manganese or low‑alloy steels and to fixtures of other ferrous and selected non‑ferrous alloys; it excludes non‑self‑propelled floating structures and hulls principally of aluminium alloys, stainless steels or concrete.

General information

• Status: Published
• Publication date: January 2018
• Publisher: International Organization for Standardization (ISO)
• ICS / categories: 47.020.10 (Hulls and their structure elements)
• Edition / version: Edition 1 (2018)
• Number of pages: 56

Scope

This standard is applicable to the cathodic protection of the immersed sections of hulls and tanks containing seawater for ships, boats and other self‑propelled floating vessels. It includes fixtures and appendages commonly encountered on ship hulls such as rudders, propellers, shafts, stabilizers, thrusters, sea chests and water intakes (up to the first valve). The document provides guidance for both coated and bare hulls but is not intended for hulls principally fabricated from aluminium alloys, stainless steels or concrete, nor for floating structures that are not self‑propelled.

Key topics and requirements

• Protection criteria and performance targets for impressed current and galvanic anode systems.
• Design basis and process: defining cathodic protection zones, current demand estimation and design current densities for bare and coated steel.
• Requirements for system components: anodes, power sources, reference and measurement electrodes, cables and terminations.
• Electrical continuity, bonding and isolation considerations for hulls and fittings.
• Installation, commissioning, testing and monitoring procedures, including commissioning during the fitting‑out period.
• Guidance on selection and placement of anodes, dielectric shields and cofferdams where applicable.
• Competence of personnel involved in design, installation and inspection of cathodic protection systems.
• Limitations, exclusions and interaction with protective coatings and other corrosion protection measures.

Typical use and users

ISO 20313:2018 is used by naval architects, ship designers and shipyards for the specification and installation of cathodic protection systems; by classification societies and flag administrations when assessing compliance and safety; by marine corrosion engineers and consultants for system design and surveys; and by ship owners/operators and marine maintenance teams for planning inspection, monitoring and replacement of anodes and CP equipment.

Related standards

Standards and technical documents commonly referenced alongside ISO 20313 include international and industry guidance on marine coatings, corrosion control and cathodic protection design practice, national/adopted versions of ISO 20313, and complementary standards covering protective coatings for ships and offshore structures. Typical associated documents include standards for protective paint systems, cathodic protection of other structures, and classification society rules and guidance on anode systems and electrical continuity.

Keywords

cathodic protection, ships, hull protection, impressed current, galvanic anodes, anode placement, ballast tanks, corrosion control, marine engineering, electrical continuity, monitoring, commissioning

FAQ

Q: What is this standard?

A: ISO 20313:2018 is an international standard that provides criteria and recommendations for the design, specification, installation and monitoring of cathodic protection systems for ship hulls and ballast tanks.

Q: What does it cover?

A: It covers both impressed current and galvanic (sacrificial) anode cathodic protection systems for the immersed parts of self‑propelled vessels made primarily of carbon/manganese or low‑alloy steels, including common hull fittings and appendages. It addresses design current demand, component selection, electrical continuity, commissioning and monitoring.

Q: Who typically uses it?

A: Naval architects, shipyards, marine corrosion engineers, classification societies, flag administrations, ship owners/operators and surveyors involved in the design, installation, certification and maintenance of shipboard cathodic protection systems.

Q: Is it current or superseded?

A: ISO 20313 was published in January 2018 as the first edition. As with other ISO standards, it is subject to periodic review (typically every five years); users should check the issuing body for the latest status if they require confirmation beyond the publication date.

Q: Is it part of a series?

A: ISO 20313 sits within the body of ISO standards addressing ships and marine technology and is often used together with standards and guidance on protective coatings, general corrosion control and industry/country‑specific regulations and classification society rules; it is not a multi‑part ISO series by itself but forms part of the broader maritime standards landscape.

Q: What are the key keywords?

A: Cathodic protection, ships, hulls, impressed current, galvanic anodes, ballast tanks, corrosion protection, monitoring, commissioning, marine engineering.