Section 6 Testing and trials

6.1.1 The requirements of the Rules relating to testing of pressure vessels, piping and related fittings including hydraulic testing are applicable. (see Vol 2, Pt 8, Ch 2, 10 Hydraulic tests and Vol 2, Pt 7, Ch 1, 16 Testing).

6.1.2 On completion, tanks and reservoirs for service and storage of system fluids are to be tested by a head of water equal to the maximum to which the tanks may be subjected, but not less than 2,5 m above the crown of the tank.

6.1.3 After installation on board, piping systems together with associated fittings that are under internal pressure, are to be subjected to a running test at the intended maximum working pressure.

6.1.4 Testing is to cover the following items:

1. Verification of control, alarm, safety and where applicable, refrigerant detection systems in accordance with Vol 2, Pt 9, Ch 11 Gas Detection.

2. Tests simulating failure of selected components such as compressors, pumps and fans, to verify correct functioning of alarm and systems in service.

3. Verification of accuracy, calibration and functioning of temperature control, monitoring and recording instrumentation for chilled water and associated refrigerant systems.

6.2.1 Each type of pump and compressor unit is to be subjected to a type test that replicates the intended operating cycle/environment as far as practicable, e.g. still air conditions and high/low ambient air temperatures. The type test is to be for a duration of not less than 100 hours, the test arrangements are to be such that the units may run in idling conditions, and at maximum delivery capacity at maximum working pressure. During the test, idling periods are to be alternated with periods at maximum delivery capacity at maximum working pressure. The passage from one condition to another should occur at least as quickly as may in service on board. During the whole test, no abnormal heating, excessive vibration or other irregularities are permitted. After the test, the unit is to be opened out and inspected. Type tests may be waived for units that have been proven to be reliable in marine service or that have been previously type tested with satisfactory certification and testing evidence.

6.3.1 Trials are to be carried out to demonstrate the capability of systems to meet System Design Descriptions. The trials are as far as practicable to be representative of the actual conditions to be encountered in service.

6.3.2 Where the Risk Assessment (RA) report has identified the need to prove the conclusions, testing and trials are to be carried out as necessary to investigate the following:

1. The effect of a specific component failure or damage situation.

2. The effectiveness of automatic/manual isolation systems.

3. The effectiveness of reconfiguration arrangements.

4. The behaviour of any interlocks that may inhibit operation of other systems.