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. 184
SHELLS


Spacing of rows of rivets

a) In joints, whether lapped or fitted with butt straps, in which there are more than one row of rivets and in which there is an equal number of rivets in each row, the distance between the rows of rivets shall be not less than-

Zig-zag riveting :-
0.33P + 0.67D = distance between centre lines of rows (R) Eqn. (12)

Chain riveting :-
2D = distance between centre lines of rows (R) Eqn. (13)
b) In joints in which the number of rivets in the outer rows in one-half of the number in each of the inner rows, and in which the inner rows are chain rivets the distance between the outer rows and the next rows shall be not less than as required by equations (12) and (13) whichever is the greater, and the distance between the rows in which there are the full number of rivets shall be not less than 2D(R1).
c) In joints in which the number of rivets in the outer rows in one-half of the number in each of the inner rows and in which the inner rows are zig-zag, the distance between the outer rows and the next rows shall be not less than-
0.2P + 1.15D = distance between centre lines of outer and next rows (R) Eqn. (14)

The distance between the rows in which there are the full number of rivets shall be not less than :-
0.165P + 0.67D = distance between centre lines of inner rows (R1 ) Eqn. (15)

Where
P is the pitch of the rivet in the outer rows.

D is the diameter of the rivet holes in inches or the mean of the diameter of rivet holes when the distance to be determined is between two rows of the different diameters.
d) Should the distance between rows of rivets be less than as prescribed above the plate percentage determined by equation (2) shall be modified thus –

100 [ P - (     2 -       actual distance       )           D ]
                            prescribed distance
                                                                                          = modified plate percentage 
                                         P                                                                 Eqn. (16)
e) In all cases the clear space between a rivet hole and the edge of a plate shall not be less than the diameter of the rivet holes, i.e. the centre of the rivet hole shall be at least 1-1/2 diameters distant from the edge of the plate (E);

Provided that if this condition be not observed, the strength value of the rivet affected shall be reduced in the proportion of the actual distance between the outer edge of the rivets and the edge of the plate to the prescribed distance
 
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