- Annually the cylinders should be subject to a contents or level check by a competent person. The competent person may be either a member of the
- Ship’s crew who is trained and assigned to carry out the task or an accredited service agent.
- At least once every 2 years the cylinders should be subject to an inspection by an accredited service agent1, this inspection should be conducted in conjunction with the service for the entire system and will include:
- Visual inspection of each cylinder, fittings and securing arrangements.
- Accurate determination of the contents and comparison with original readings e.g. liquid level gauging, test weighing etc.
- Any cylinders showing signs of mechanical damage, excessive corrosion, or loss of contents exceeding 10% of installed quantity for CO2 or 5% for Halon should be withdrawn from service and sent ashore for full periodic service and inspection. If more than 10 years have elapsed since initial pressure test at manufacture, they will require to be hydraulically tested before refilling.
The hydraulic pressure test period for these high-pressure cylinders is as follows:
- First pressure test within 20 years of initial pressure test at manufacture, provided annual tests have been carried out with satisfactory results.
- Subsequent pressure tests every 5 years
Testing for High-Pressure Halogenated Hydrocarbon (Halon) systems
- The Administration strongly advises owners to consider replacing their existing Halon systems before the hydrostatic test of the cylinders is due. However, where problems arise the following may be considered for which special application must be made on a ship-by-ship basis:
Due to the environmental implications of emptying, testing and recharging of these cylinders and the reduced risk of internal corrosion due to the absorption of moisture by the Nitrogen pressurization gas.
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