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Reg. 153, Reg. 154
BOILER AND SUPER-HEATER TUBES SUBJECT TO INTERNAL PRESSURE

 

Copper Tubes

Copper tubes upto one inch in external diameter may be used for small boilers; such tubes shall be not less than 12 s.w.g. thick.



Reg. 154
HEADERS, MUD BOXES, ETC., OF WATER TUBE BOILERS

 

a) (i) Headers and Mud Boxes, etc., of water tube boiler may be of seamless or welded steel, or of cast steel complying with the requirements of the provisions contained in regulations 73 to 80. Where welded, the welding shall be stress relieved, radiographed or ultrasonically examined and in all respects shall be to the satisfaction of the Inspecting Authority.

(ii) Open ends of seamless steel tube headers may be closed by forging or the ends may be secured by bolting, screwing or welding in an approved manner. Bolting shall not be used where the bolts are exposed to or are swept by gases of combustion.

(iii) The method of attachment of the ends shall be subject to the approval of the Inspecting Authority.

b) Each piece prior to being fitted in place shall be subjected to hydraulic test to one-and-a-half times the permissible working pressure of the boiler into which it is fitted.
c) (i) The sighting hole doors and header caps shall be substantial and be capable of being removed or replaced from time to time without loss of efficiency or safety. They must be held in position either by means of bolts or by seal welding.

(ii) The bolts by which they are held in place shall be fitted to them in such a way as to satisfy the above conditions.

(iii) The doors shall be so designed that they will not blow out in the event of breakage of the bolt.

(iv) Circular holes also may be provided in addition to the elliptical holes, if provision is made to prevent the door bolts from turning, while securing the joint.

d) All flanges shall have a fillet with a radius of curvature at least equal to the thickness of the necks to which they are attached.
 
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