Section 2 Plans and documentation
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Ships, July 2022 - Part 7 Other Ship Types and Systems - Chapter 1 Controlled Atmosphere Systems - Section 2 Plans and documentation

Section 2 Plans and documentation

2.1 Plans of CA zones and adjacent spaces

2.1.1 The following plans and particulars of the CA zones and adjacent spaces are to be submitted in triplicate for approval before construction is commenced:

  1. Capacity plan.

  2. Location and installation of CA equipment.

  3. Arrangement of CA zones in elevation and plan view.

  4. Access arrangement.

  5. Arrangement and use of spaces adjacent to CA zones.

  6. Details of securing weather deck and `tween deck hatch lids.

  7. Details of securing gratings in way of hatch lids.

  8. Details of weather deck and access hatch seals.

  9. Door seals, scuppers, pipes, cables and ducts penetrating the decks, bulkheads, etc. together with proposed design conditions in the CA zones.

  10. Specified leakage rate and proposals for its measurement.

  11. Location of sampling points for CA gas and/or sensors in the CA zones and adjacent spaces.

  12. Details of the gas supply piping system.

  13. Details of gas freeing arrangements including fans, valves, ducts and any interlocks.

  14. Details of pressure/vacuum valves for protecting devices in CA zones, location of outlets from P/V valves and capacity calculations.

  15. Details of security locks provided on entry to the hatch and manhole covers, and doors leading to CA zones and adjacent spaces.

  16. Arrangements of ventilation systems for the gas generator compartment and other adjacent spaces adjoining CA zones.

2.2 Gas supply system

2.2.1 The following plans and particulars of the gas supply system, etc. are to be submitted in triplicate for approval, before construction is commenced:

  1. Schematic arrangements of the proposed gas supply systems and, where applicable, details of compressors, pressure vessels, membranes, storage tanks, gas cylinders, control and relief valves and safety arrangements, including pressure set points of alarm and safety devices.

  2. Capacities of gas supply systems at different oxygen and carbon dioxide levels, if applicable.

2.3 Humidifiers

2.3.1 Where applicable, the following plans and particulars of the humidification system, etc. are to be submitted in triplicate for approval, before construction is commenced:

  1. Specification and capacity of the system.

  2. Principles of operation and control of relative humidities under different operating conditions.

  3. Details of proposed equipment, nozzles, pads, heaters, pumps, steam generator, compressors, water tanks, etc.

  4. Layouts of the equipment and the positioning of sensors and controls.

2.4 Control equipment

2.4.1 The following plans and details of the control, alarm and safety systems for CA zones, gas supply compartment and other adjacent spaces, are to be submitted in triplicate before construction is commenced:

  1. Line diagrams of all control circuits.

  2. List of monitored, control and alarm points.

  3. Details of computer systems, if fitted.

  4. Location of control panels and consoles.

  5. Controls of all valves and dampers fitted to CA zones.

  6. Details of oxygen and carbon dioxide analysers and arrangements for calibration.

  7. Relative humidity (RH) sensors and details of calibration.

  8. Details of alarm system, including location of central control panel and audible and visual warning devices.

2.5 Electrical

2.5.1 In addition to the applicable requirements of Pt 6, Ch 2, 1.2 Documentation required for design review, the following information and plans specific to the installed CA system are to be submitted in triplicate for approval, before construction is commenced:

  1. Main power supply arrangement to the CA system.

  2. Single-line diagram of the CA system which is to include rating of electrical machines, insulation type, size and current loading of cables and make, type and rating of protective devices.

  3. A schedule of normal operating loads of CA system, estimated for the different operating conditions expected.

2.6 Testing

2.6.1 Details of the testing programme are to be submitted, including instrumentation to be used with range and calibration.


Copyright 2022 Clasifications Register Group Limited, International Maritime Organization, International Labour Organization or Maritime and Coastguard Agency. All rights reserved. Clasifications Register Group Limited, its affiliates and subsidiaries and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Clasifications Register'. Clasifications Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Clasifications Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract.