Message from
Chairman of Central Boilers Board


About Central Boilers
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

Reg. 166
MANHOLES, MUDHOLES, ETC.

 

Doors and Cross Bars

a) All internally fitted doors of manholes, mudholes and sightholes shall be of wrought steel built up or pressed to shape and annealed or made from one thickness of plate with a machined recess for the jointing material or may be a steel casting. Their spigot part or the recess shall not have a greater clearance than 1/16th inch all round i.e. the axis shall not be less than 1/8th inch smaller than the holes in which they are fitted.
b) The studs or bolts of large doors may be screwed through the plates and riveted over when the working pressure of the boilers does not exceed 200 lbs. per square inch. When such pressure exceeds 200 lbs. per square inch, the studs or bolts need not be screwed through the full thickness of the plate, provided that the depth of screwing is not less than the diameter of the stud and the stud is locked against turning by welding or other means approved by the Inspecting Authority. Lugs may be satisfactorily welded to manhole doors for the attachment of bolts. All welds shall be made to the satisfaction of the Inspecting Authority.
c) Internal doors for opening not larger than 9 inches x 7 inches size need only be fitted with one stud, which shall be provided with an integral colar and screwed through the plate with a nut on the inside of the door. Internal doors of opening not larger than 5 inches x 3½ inches may have the stud forged solid with the door or screwed, be efficiently riveted to the doors. Where the door of a mudhole cleaning hole or sight hole is fabricated by welding for boilers not exceeding a working pressure of 8.8 kg./cm.2 (125 lbs. per sq. inch), the stud shall pass through the plate and be secured to it by strength-welding on the inside and fillet-welding on the outside to the satisfaction of the Inspecting Authority. The door shall be stress relieved by heat-treatment after welding.
d) The cross bars shall be of substantial proportions and of mild or wrought steel.
 
Back   Top
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