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Reg. 281 A.

Additional requirements for automatic boilers only:

1.

General :

Every boiler which is provided with the appropriate water level and/or firing control, to allow for automatic working, shall comply with the following requirements:

a) In the event of failure of automatic control, boiler shall be capable of being brought under immediate manual control.
b) In those cases where the control and alarm devices are housed in chambers external to the boiler, the following shall apply:

(i) the boiler shall have provision made for isolating the steam and water connections of the chambers from the boiler. Such isolating valves shall be capable of being locked in the open position and should preferably be of the parallel slide type but if screw down stop valves are fitted, those on the water connection shall be mounted with the spindle horizontal to avoid the possibility of an air lock.
(ii) the boiler shall have means provided to test the operation of the control or alarm and to blow through separately the water connection and the chamber to prevent the accumulation of deposits. The means provided for flowing through shall be sequencing valves or equivalent devices so arranged that the water connection to the boiler cannot be shut off unless the drain connections to the chamber is open;
(iii) the boiler shall have a drain system from the chambers which provides a visual indication of flow.

Tundishes of adequate size, placed in a prominent position shall be used wherever practicable.
c) Where the boiler is provided with electrical equipment for water level and firing control, it shall have this equipment so designed that any fault in the circuits caused both in the fuel and air supply the boiler to be automatically shut off. Positive means requiring manual resetting shall be provided to cut off the fuel and air supplies to the boiler should there be a failure of electricity supply to water level and/or firing control equipment. All electrical conductors and equipment in connection with water level and firing controls shall be of adequate size and shall be properly insulated and protected against danger including adequate protection against the ingress of moisture and the effects of high temperature.
d)

 

 

 

 

 

 

 

 

 

 

Where the evaporating capacity of the boiler is greater than 3700 kg/hr., it shall have automatic water level alarms and firing controls and can be tested regularly without altering the level of water in the boiler. The water level alarms may be incorporated in the automatic control systems.

With a perceptible water level which are arranged for automatic working and not intended for continuous supervision shall be provided with an entirely independent and separately operated over-riding control in addition to the water level and firing controls specified in clause (2) and (3). The over-riding control shall comply with the following requirements:-

(i) Cut off fuel supply to the burners or the fuel and air supply to solid fuel stoker and operate an audible alarm when the water level in the boiler falls to a predetermined low water level:-
(ii) Be of the lock-out type and so arranged that control or its electricals circuit has to be manually reset before the boiler can be brought back into operation;
(iii) Be provided with its own entirely independent electrical control circuit.


(iv)
 

Where mounted externally to the boiler, the over-riding control shall:

(i) Be provided with its own chamber;
(ii) Comply with the requirements of clause (b)
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Message from Chairman of Central Boilers Board About Central Boiler Board History of Indian Boiler Regulations Foreword Contents Chapter Wise Contents Regulation Wise List of Amendments
Indian Boilers Act 1923 Ibr Forms Home Search Help Contact Us