Section 12 Hydraulic tests on pipes and fittings
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Linkspans, July 2022 - Part 4 Engineering Systems - Chapter 4 Piping and Pressure Vessel Design Requirements - Section 12 Hydraulic tests on pipes and fittings

Section 12 Hydraulic tests on pipes and fittings

Parent topic: Chapter 4 Piping and Pressure Vessel Design Requirements

12.1 Hydraulic tests before installation

12.1.1 All Class I and II pipes and their associated fittings are to be tested by hydraulic pressure. Further, compressed air and flammable liquid pipes, together with their fittings, are to be similarly tested where the design pressure is greater than 0,7 MPa. The test is to be carried out after completion of manufacture and before installation and, where applicable, before insulating and coating.

12.1.2 The test pressure is to be 1,5 times the design pressure, as defined in Pt 4, Ch 4, 3.2 Design pressure.

12.1.3 Valves, cocks and distance pieces intended for installation on the shell are to be tested by hydraulic pressure to not less than 0,5 MPa.

12.2 Testing after assembly

12.2.1 Flammable liquid piping is to be tested by hydraulic pressure, after installation, to 1,5 times the design pressure but in no case to less than 0,35 MPa.

12.2.2 Where pipes specified in Pt 4, Ch 4, 12.1 Hydraulic tests before installation 12.1.1 are butt welded together during assembly, they are to be tested by hydraulic pressure, in accordance with the requirements of Pt 4, Ch 4, 12.2 Testing after assembly 12.2.1, 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.

12.2.3 The hydraulic test required by Pt 4, Ch 4, 12.2 Testing after assembly 12.2.2 may be omitted provided satisfactory non-destructive tests by ultrasonic or radiographic methods are carried out on the entire circumference of all butt welds.

12.2.4 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 a detrimental effect on the service performance of the piping.

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