Section 14 Hydraulic tests on pipes and fittings
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Special Service Craft, July 2022 - Part 15 Piping Systems and Pressure Plant - Chapter 1 Piping Design Requirements - Section 14 Hydraulic tests on pipes and fittings

Section 14 Hydraulic tests on pipes and fittings

Parent topic: Chapter 1 Piping Design Requirements

14.1 Hydraulic tests before installation on board

14.1.1 All Class I and II pipes and their associated fittings are to be tested by hydraulic pressure. Further, all steam, feed, compressed air and fuel oil pipes, together with their fittings, are to be similarly tested where the design pressure is greater than 7 bar. The test is to be carried out after completion of manufacture and before installation on board and, where applicable, before insulating and coating.

14.1.2 The test pressure is to be 1,5 times the design pressure, as defined in Pt 15, Ch 1, 4.2 Design pressure.

14.1.3 Shell valves and valves on the collision bulkhead are to be tested by hydraulic pressure to 1,5 times the nominal pressure rating of the valve at ambient temperature.

14.2 Testing after assembly on board

14.2.1 Fuel oil piping is to be tested by hydraulic pressure, after installation on board, to 1,5 times the design pressure but in no case to less than 3,5 bar.

14.2.2 Where pipes specified in Pt 15, Ch 1, 14.1 Hydraulic tests before installation on board 14.1.1 are butt welded together during assembly on board, they are to be tested by hydraulic pressure in accordance with the requirements of Pt 15, Ch 1, 14.2 Testing after assembly on board 14.2.1 after welding. The pipe lengths may be insulated, except in way of the joints made during installation and before the hydraulic test is carried out.

14.2.3 The hydraulic test required by Pt 15, Ch 1, 14.2 Testing after assembly on board 14.2.2 may be omitted provided non destructive tests by ultrasonic or radiographic methods are carried out on the entire circumference of all butt welds with satisfactory results.

14.2.4 Where ultrasonic tests have been carried out, the manufacturer is to provide the Surveyor with a signed statement confirming that ultrasonic examination has been carried out by an approved operator and that there were no indications of defects which could be expected to have prejudicial effect on the service performance of the piping.

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