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Reg. 172-A
RIVETING

 

Rivet Heads

The rivet heads shall be of any one of the form(shown in sketch (1) Appendix H-4) given below:

1. Snap head.
2. Ellipsoidal head.
3. Pan head.
4. Conical head.
5. Round countersunk head.
6. Pan head with tapered neck.
7. Steeple head.
8. Countersunk head.

The dimensions of these rivet heads shall conform to the proportions indicated in the sketch.

The Chief Inspector may, at his discretion, accept any slight variation in the proportion of these dimensions and forms.


Reg. 172-B
RIVETING

 

Tolerances on shanks

The tolerances on the diameters of the shanks measured at position XX, YY, ZZ shown in sketch 2,Appendix H-4 shall be within the limits given in table below:-

                                                                Diameter of Shanks

Reference position as shown in Sketch-2 Appendix H-4
Distance from rivet head or end
For rivets 5D and below in length For rivets over 5D in length
Max. Min. Max Min.
XX
D/8 plus 3/8” D+1/64”
for D=1”
and under
D D + 1/64”
for D=1”
and under
D
YY D/2 from end
D D-1/64” D D-1/64”
ZZ D/2 from end
- - - D-1/64”



Reg. 172-C
RIVETING

 

Rivet Holes

1) Rivet holes shall not be punched, but shall be drilled full size from the solid plate, and wherever possible rivet holes shall be drilled in place with plates, straps and ends bolted in position. After drilling the plates shall be separated, the burrs and the sharp edges of the holes shall be removed and the contact surfaces of the plates shall be cleaned. All tacking holes shall be drilled to a size which will allow the holes to be enlarged to the required rivet size by drilling or reaming. All rivet holes shall be slightly countersunk under each rivet head.
2) The diameter of the rivet hole shall be not more than 1/16 inch larger than the standard diameter of the cold rivet as manufactured.
3) Where sizes of rivets are mentioned the sizes refer to the diameters of the rivet holes not to the diameters of the rivets used before closing.
 
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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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