Section 2 Pumping and piping

2.1.1 For general requirements on hydraulic systems, see Pt 5, Ch 12, 9 Hydraulic systems.

2.1.2 Arrangements are to be provided to avoid an uncontrolled lowering of the wheelhouse in case of hose rupture.

2.1.3 An emergency lowering arrangement operable from the wheelhouse is to be provided.

2.1.4 Arrangements are to be provided to maintain the cleanliness of the hydraulic fluid taking into consideration the type and design of the hydraulic system.

2.1.5 Stopping of wheelhouse lowering is to be such as to avoid an undue rise in pressure in the hydraulic system above the design pressure. See also Pt 6, Ch 1, 3.9 Liftable wheelhouse systems 3.9.2.

2.1.6 For hydraulic test on pipes and fittings, see Pt 5, Ch 10, 8 Hydraulic tests on pipes and fittings.

2.2.1 A standby hydraulic pump is to be provided for dry cargo ships.

2.2.2 The standby pump is to be connected ready for immediate use.

2.2.3 For over-pressure protection of the pumps, see Pt 5, Ch 12, 4.2 Relief valves on pumps 4.2.1.

2.2.4 Valves or cocks are to be interposed between the pumps and the suction and discharge pipes, in order that any pump may be shut off for opening up and overhauling.

2.3.1 Hose assemblies approved by Clasifications Register may be installed between two points where flexibility is required but are not to be subjected to torsional deflection (twisting) under normal operating conditions. In general, the hose should be limited to the length necessary to provide for flexibility and for proper operation of machinery.

2.3.2 Service life time of flexible hoses is not to exceed Manufacturer's recommendations.

2.3.3 In addition to the above the requirements of Pt 5, Ch 10, 7 Flexible hoses are to be complied with as far as they are applicable.