Clasification Society Rulefinder 2016 - Version 9.25
Clasification Society Rules and Regulations - Rules and Regulations for the Classification of Offshore Units, January 2016 - Part 8 CORROSION CONTROL - Chapter 1 General Requirements for Corrosion Control - Section 3 Plans and information

Section 3 Plans and information

Parent topic: Chapter 1 General Requirements for Corrosion Control

3.1 Scope

3.1.1 In order that an assessment may be made of protection systems full details as outlined in this Section are to be submitted.

3.2 Cathodic protection systems

3.2.1 The following plans and information are to be submitted:
  1. A surface area breakdown for all areas to be protected including secondary steelwork and details of appurtenances.
  2. The resistivity of the sea water and sediments.
  3. All current densities used for design purposes.
  4. The type and location of any reference electrodes and their methods of attachment.
  5. Full details of any coatings used and the areas to which they are to be applied.
  6. Details of any electrical bonding.
  7. Details of current drain.
  8. Stray current considerations.

3.3 Sacrificial anode systems

3.3.1 In addition to the information required by Pt 8, Ch 1, 3.2 Cathodic protection systems the following plans and information are to be submitted:
  1. The design life of the system in years.
  2. Anode material and minimum design capacity of anode material, in Ah/kg.
  3. The dimensions of anodes including details of the insert and its location.
  4. The nett and gross weight of the anodes, in kg.
  5. The means of attachment.
  6. Plans showing the location of the anodes.
  7. Calculation of anodic resistance, as installed and when consumed to their design and utilisation factor, in ohms.
  8. Closed circuit potential of the anode material, in volts.
  9. Details of any computer modelling.
  10. The anode design utilisation factor.

3.4 Impressed current systems

3.4.1 In addition to the information required by Pt 8, Ch 1, 3.2 Cathodic protection systems, the following plans and information are to be submitted:
  1. The anode composition and where applicable the thickness of the plated surface, consumption and life data.
  2. Anode resistance, limiting potential and current output.
  3. Details of construction and attachment of anodes and reference electrodes.
  4. Size, shape and composition of any dielectric shields.
  5. Diagram of the wiring system used for the impressed current and monitoring systems including details of cable sizes, underwater joints, type of insulation and normal working current in circuits, and the capacity, type and make of the protected devices.
  6. Details of glands and size of steel conduits.
  7. Plans showing the locations of the anodes and reference electrodes.
  8. If the system is to be used in association with a coating system then a statement is to be supplied by the coating manufacturer that the coating is compatible with the impressed current cathodic protection system.

3.5 Coating systems

3.5.1 The following plans and information are to be submitted:
  1. Evidence that any primers used will have no deleterious effect on subsequent welding or on subsequent coatings.
  2. Details of the painting specification with regard to:
    1. The generic type of the coating and conformation of its suitability for the intended environment;
    2. The methods to be used to prepare the surface before the coating is applied and the standard to be achieved. Reference should be made to established International or National Standards;
    3. The method of application of the coating; and
    4. The number of coats to be applied and the total dry film thickness.
  3. Details of the areas to be coated.
  4. Inspection and Testing Plan.
3.5.2 In addition to the information required by Pt 8, Ch 1, 3.5 Coating systems 3.5.1 the following may also be required:
  1. When a coating contains aluminium and is intended to be used on decks or in areas where flammable gases may accumulate, a statement from an independent laboratory confirming that appropriate tests have shown that the coating does not increase the incendive sparking hazard in the area to which it is to be applied.
  2. Where a coating is to be applied in accommodation spaces, machinery spaces and areas of similar fire risk, a statement that the coating is not formulated on a nitrocellulose or other highly flammable base and has low flame spread characteristics (complying to at least BS476: Part 7: Classification 2 or any other equivalent National Specification).

3.6 Inhibitors and biocides

3.6.1 Where it is proposed to use inhibitors, biocides, or other chemicals for the protection of storage tanks, full details, including compatibility with each other and evidence of satisfactory service experience or suitable laboratory test results or any other data to substantiate the suitability for the intended purpose are to be submitted for consideration.

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