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Reg. 330, Reg. 331, Reg. 332, Reg. 333

Test Connections-Inspector’s Pressure Gauge Attachment

 


Every boiler shall be fitted with a valve or cock carrying in a vertical position a receiving screw for attachment of the Inspector’s pressure gauge. The receiving socket shall be tapped for M20 x 1.5 metric threads and shall be fitted with an easily removable cap.



Reg. 331
FUSIBLE PLUGS

General

1) Fusible plugs shall be of sufficient height and fitted in such a position as to give early protection to all parts of the boiler liable to damage by the direct application of furnace heat in the event of shortness of water.
2) On boilers having wet back reversing chamber, a minimum of two fusible plugs shall be fitted; one on the crown of the reversing chamber and the other on one of the tube plates. On boilers not having Wet back reversing chamber, at least one fusible plug shall be provided on the front end tube plate. The plug shall be fitted in such a way that in the event of fusion of the plug, the pressure inside the boiler shall push the pellets out.

Note: - For example : In Lancashire Boilers the fusible plugs should be in the crowns of the furnaces from 12 inches to 18 inches in front of the brickwork fire bridge.



Reg. 332

Type

Fusible plugs shall consist of an outer body with a central conical passage the smallest part to be not greater than 1/2 inch for plugs suitable for pressure up to 100 lbs. per sq. in. and not greater than 3/8 inch for plugs for pressures exceeding 100 lbs. per sq. in. The passage shall be closed by a plug secured by an annual lining of fusible alloy so that the plug may drop clear if the lining melts.

The portion of the body carrying the fusible metal should preferably be detachable from the base to allow of easy replacement without removing the whole fitting from the boiler.


Reg. 333

Material

The non-fusible portions of the plug shall be of bronze except where the nature of the boiler water precludes the use of a non-ferrous material. The fusible metal shall be an alloy melting readily at a temperature not less than 150º F in excess of the saturated steam temperature at the maximum permissible working pressure of the boiler.
 
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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
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