Section 6 Water jet units
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Special Service Craft, July 2022 - Part 9 General Requirements for Machinery - Chapter 2 Surveys During Construction, Installation and Sea Trials - Section 6 Water jet units

Section 6 Water jet units

Parent topic: Chapter 2 Surveys During Construction, Installation and Sea Trials

6.1 Construction and welding

6.1.1 The following components are to be inspected at the manufacturer's works:

  • Steering nozzle.
  • Reverse bucket.
  • Stator impeller.
  • Integral bearing.

6.1.2 Welded construction is to be in accordance with the requirements specified in Ch 13 Requirements for Welded Construction of the Rules for Materials.

6.1.3 Welded components are to comply with the requirements of Pt 15, Ch 4 Pressure Plant and be subject to stress relief heat treatment upon completion. Where an impeller has welded blades, non-destructive testing is to be carried out to an approved procedure.

6.2 Testing

6.2.1 Testing of the first installation of a new type of water jet unit is required and is to demonstrate the adequacy of the steering and reversing mechanisms during the most arduous manoeuvres.

6.2.2 Upon completion, the impeller assembly is to be suitably balanced in accordance with ISO 940 Grade G6,3 or an equivalent Standard.

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