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Reg. 621, Reg. 622

Small Industrial Boilers General

Reg 621

Valves, Gauges, Fittings and Feed Supply

 
(a)
           Washout Plugs, etc. for cleaning:-

(i) Every boiler shall be fitted with at least 3 brass wash plugs of not less than 25 mm. diameter which shall be screwed into the openings in the shells near the bottom. In the boilers of closed system type heated by removable internal electric heating elements, the opening for these elements when suitable for cleaning purposes may be substituted for wash out openings.
(ii) Boilers not exceeding 300 mm. internal diameter may have two 25 mm. openings for cleaning one of which may be used for the attachments of the blow off valve. The openings shall be opposite to each other, wherever possible. All threaded openings in the boiler shall be provided with riveted or welded reinforcement, if necessary, to give four full threads therein.
(iii) Electric boilers of a design employing removable top cover flange for inspection and cleaning need not be fitted with washout openings and washout plug. Level gauges are not required for once through boilers.
(b) Every boiler shall be provided with at least one feed pump or other feeding device except where it is connected with a water main carrying pressure to feed the boiler or where the steam generator is operated with no extraction of steam (closed system). In the latter case, in lieu of the feeding device, a suitable connection or opening shall be provided to feed the boilers. Such connection shall be not less than 13 mm. in diameter.
(c)
Subject to the provisions of this sub-regulation every boiler shall be fitted with necessary mountings and fittings as provided in Chapter VI of these regulations, and they shall be of substantial construction suitable for 7 kg/cm2. All these fittings except safety valves shall be certified by manufacturers of the fittings themselves.
(i)
Feed pipe:
The feed pipe shall be provided with a check valve and a stop valve of a size not less than that of the pipe. The feed water may be delivered to the boiler through the openings of the same size in the shell as that of the blow off connection.
(ii)
Blow Off:
Each boiler shall be equipped with a blow off connection, not less than 18 mm. in size located to drain the boiler water from the lowest water space practicable when the boiler is under pressure. Feed water shall not be introduced through the openings or connection needed for the water column, the water gauge glass or the gauge cock.
(iii)
Water Gauges:
Every boiler other than a coil type or a once through boiler shall be fitted with two gauge glasses not less than 150 mm. long for determining the water level. The boiler shall have the lowest visible part of the water gauge located at least 25 mm. above the lowest permissible water level.


The lowest permissible water level of vertical boilers shall be at a point one-third of the height of the shell above the bottom head or tube sheet. Where the boiler is equipped with internal furnace, the water level shall not be less than one-third of the length of the tubes above top of the furnace tube sheet.
(iv)
Pressure Gauge:
The steam pressure gauge shall have its dial graduated to not less than twice the maximum allowable working pressure of the boiler. The diameter of the dial shall be at least 100 mm. and the pipe connecting the pressure gauge shall be minimum 10 mm. and the connection shall be through siphon.
(v)
Safety Valve:
Each boiler shall be equipped with two safety valves for relieving the steam pressure. The diameter of the valve shall not be less than 19 mm.
       The minimum relieving capacity of the safety valve shall be sufficient to discharge all the steam that can be generated by the boiler without allowing the pressure to rise more than 10% above maximum allowable working pressure. The safety valve shall be connected to the boiler independently of any other steam connections, without any unnecessary intervening pipe or fitting. Such intervening pipe or fitting if unavoidable shall be not longer than the corresponding face to face dimension of a tee fitting of the same diameter and the minimum opening there through shall be at least equal to the valve inlet.

No valve of any description shall be placed between safety valve and the boiler not on the discharge pipe from the safety valve to the atmosphere.

The electrically heated boilers shall be effectively earthed with a lead of substantial cross section.


Reg. 622

Registration, Operation and Maintenance


(a)
(i)
The fee required to accompany an application under sub-section (1) of section 7 of the Act shall be five hundred rupees per boiler.
(ii)
The annual inspection fee shall be five hundred rupees per boiler.
(b)
  The certificate of manufacture and test for small industrial boilers shall be furnished in Form XVII appended to these regulations.
(c)
  The operator for these boilers shall be a pass in Class X or equivalent.
 
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