Section 11 Boilers
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Naval Ships, January 2023 - Volume 1 Ship Structures - Part 1 Regulations - Chapter 3 Periodical Survey Regulations - Section 11 Boilers

Section 11 Boilers

Parent topic: Chapter 3 Periodical Survey Regulations

11.1 Frequency of survey

11.1.1 All boilers, economisers, steam receivers, steam heated steam generators, thermal oil and hot water units intended for Mobility or Ship Type systems, together with boilers used exclusively for Ancillary systems having a working pressure exceeding 3,4 bar and a heating surface exceeding 4,65 m2 are to be surveyed at intervals not exceeding 3 years and generally examined externally at the time of the Annual Survey of the ship.

11.2 Scope of surveys

11.2.1 At the surveys described in Vol 1, Pt 1, Ch 3, 11.1 Frequency of survey the boilers, superheaters, economisers and air heaters are to be examined internally and externally and where considered necessary, the pressure parts are to be tested by hydraulic pressure and the thickness of plates and tubes and sizes of stays are to be ascertained to determine a safe working pressure. The principal mountings on boilers, superheaters and economisers are to be opened up and examined and the safety valves are to be set under steam to a pressure not greater than the approved design pressures of the respective parts. As a working tolerance, the setting is acceptable provided that the valves lift at not more than 103 per cent of the approved design pressure. The remaining mountings are to be examined externally and if considered necessary by the Surveyor, are to be opened up for internal examination. Collision chocks, rolling stays and boiler stools are to be examined and maintained in an efficient condition.

11.2.2 In fired boilers employing forced circulation, the pumps used for this service are to be opened and examined at each Boiler Survey.

11.2.3 The fuel oil burning system is to be examined under working conditions and a General Examination made of fuel tank valves, pipes, deck controlgear and oil discharge pipes between pumps and burners.

11.2.4 At each survey of a cylindrical boiler which is fitted with smoke tube superheaters, the saturated steam pipes are to be examined as detailed in Vol 1, Pt 1, Ch 3, 12 Steam pipes.

11.2.5 At the Annual General Examination referred to in Vol 1, Pt 1, Ch 3, 11.1 Frequency of survey 11.1.1 the requirements of Vol 1, Pt 1, Ch 3, 2.3 Machinery 2.3.7 and Vol 1, Pt 1, Ch 3, 2.3 Machinery 2.3.8 are to be complied with

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