Section 13 Boilers
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Inland Waterways Ships, July 2022 - Part 1 Regulations - Chapter 3 Periodical Survey Regulations - Section 13 Boilers

Section 13 Boilers

Parent topic: Chapter 3 Periodical Survey Regulations

13.1 Frequency of surveys

13.1.1 All boilers, thermal oil and hot water units intended for essential services, together with boilers used exclusively for non-essential services having a working pressure exceeding 3,5 bar and a heating surface exceeding 4,5 m2 are to be surveyed internally. There is to be a minimum of two internal examinations during each five-year Special Survey cycle. The interval between any two such examinations is not to exceed 36 months. A general external examination is to be carried out at the time of the Annual Survey on ships subjected to Annual Survey.

13.1.2 Consideration may be given in exceptional circumstances to an extension of the internal examination of the boiler not exceeding three months beyond the due date. The extension may be granted after the following is satisfactorily carried out:

  1. External examination of the boiler.

  2. Examination and operational test of the boiler safety valve relieving gear (easing gear).

  3. Operational tests of the boiler protective devices.

  4. Review of the following records since the previous boiler survey:

    • Operation
    • Maintenance
    • Repair history
    • Feedwater chemistry.
Note : In this context ’exceptional circumstances’ means unavailability of repair facilities, essential materials, equipment or spare parts.

13.2 Scope of surveys

13.2.1 At the surveys described in Pt 1, Ch 3, 13.1 Frequency of surveys the boilers 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 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.

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

13.2.3 The fuel oil burning system is to be examined under working conditions and a general examination made of fuel tank valves, pipes, control gear and oil discharge pipes between pumps and burners.

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