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Reg. 391 A

Aging of boilers

a) Shell Type Boilers:-

(i) In order to take the aging effect on boilers, the working pressure of the parts of them as calculated from the formulae in these regulations shall be reduced as per the table given below:-

Age of boiler exceeding
(in years)
25 35 45 50 60 70 80 90 100
Maximum permitted working pressure percent. 95 90 85 80 70 60 50 40 30
(ii) For those boilers the plates of which have already been cut and tested shall be given a further lease of life of fifty years from the date of the test of the boilers. The working pressure that shall be allowed after the testing shall be reduced as per the table given below:-

Period after date of test
(in years)
10 20 30 40 50
Maximum working pressure
allowed (percentage)
90 80 70 50 30
b) Water Tube Boilers: -

(i) The boilers which are operating at a temperature of 400°C and above including utility or industrial boilers and all boiler parts operating in the creep range of the boiler shall be non-destructively tested as per the table 1 given below after they are in operation for 1,00,000 hours for assessment of the remnant life of the parts;
(ii) The parts of a boiler when it completes a life of twenty five years are to be tested as per table 2 for assessment of the remnant life of such parts. If results are acceptable as per the standards laid down by the Central Boilers Board, a certificate shall be issued by the Chief Inspector of Boilers for extending the life of the boiler for a further period of ten years or such less period as recommended by the Remnant Life Assessment Organisation. This assessment of remnant life shall be carried out thereafter every five years by the organisations working in the field of boilers and remnant life and extension thereof after such organisation is approved by the Central Boilers Board. Such organisation shall work in close coordination with the office of the Chief Inspector of Boilers in the field of remnant life assessment and extension. The working pressure of such boilers may be reduced on the recommendations of such approved organisation.

Notwithstanding anything contained in this regulation, for boilers working at a pressure less than 50 kg/cm2, such elaborate remnant life assessment is not mandatory.  However, in such cases, drums and headers of such boilers shall be inspected by Ultrasonic testing, Magnetic particle testing and Dye penetrant test.

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