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Reg. 122
FURNACES

 

Furnaces of Horizontal boilers

a) The sections of the internal flues shall each be in one plate and shall be bent while cold to circular form and shall be welded longitudinally.
b) The maximum permissible variation in diameter at any cross section shall not exceed the thickness of the plate.
c) The weld shall be placed at the lower part of the flues, and shall break joint in successive sections by at least 12 inches.
d) Each flange for the circular seams shall be formed at one heat by suitable machinery.
e) The sections shall be allowed to cool gradually to avoid internal stresses.
f) The caulking edges of all flue flanges shall be machined or machine gas cut.
g The circular seams shall be arranged so that they do not fall in line with those of the adjacent flue or with the circumferential seams of the shell and are at least 6 inches apart.
h) When flues are flanged for attachment to both end plates the total length of each completed flue shall not exceed the length of the shell measured from the inner surface of the back end plate to the inner surface of the front end plate, both adjacent to the shell.
i) Where the flues are flanged for attachment to the end plates, the end sections shall be 1/16 inch thicker than the remaining sections, except in cases where the calculated thickness is over 13/16 inch, when the end section shall be 7/8 inch in thickness.
j) The flanged portion of furnace rings shall have radius of curvature of not less than 1 inch on water side.
k) Sections of corrugated flues may be fusion butt welded circumferentially and afterwards stress relieved by heat treatment.
l) As an alternative to Adamson flanges, furnaces which are partly fitted with corrugated sections shall be strengthened by means of suitable stiffening rings adequately welded to the furnaces. The moment of inertia of the stiffener shall be not less than that required by Regulation 592(b). In no case shall a flat stiffener be less than 63 mm. x 13 mm. (2½” x ½”).

 
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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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