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. 149, Reg. 150
STAY TUBES

 

Thickened ends of Stay Tubes

If stay tubes are required to have their thickness increased at the screwed ends so that the thickness at the bottom of the threads is approximately the same as in the body of the tube the thickening shall be attained by upsetting and not by welding process, and the tubes shall be annealed after the upsetting.


Reg. 150
STAY TUBES

 

Load on Stay Tubes

Stay tubes shall be designed to carry the whole load due to pressure on the area to be supported. In each case the area to be calculated is as follows:-

a) For a stay tube within the tube nest the net area to be supported shall be product of the horizontal and vertical pitches of the stay tube less the area of the tube holes embraced. Where the pitch of the stay tube is irregular the area shall be taken as the square of the mean pitch of the stay tubes (i.e., one quarter the sum of four sides of any quadrilateral bounded by four adjacent stay tubes) less the area of the tube holes embraced.
b) For a stay tube in the boundary row the net area to be supported shall be the area enclosed by lines passing midway between it and the adjacent points of support less the area of any tubes embraced. The adjacent points of support may be other stay tubes, or the commencement of curvature of flanging of centre line of the circle of rivets securing the end plate to the shell angle.
 
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