 |
Reg. 136, Reg. 137, Reg. 138
SCREWED STAYS
Axial drilling
All screwed stays less than 14 inches long should preferably
be drilled with a tell-tale hole 3/16 inch diameter to a depth
of ½ inch beyond the inner face of the plate. Stays which
are obscure on one side should preferably be made from hollow
staybar.
Reg. 137
SCREWED STAYS
Stay Nuts
| a) |
Nuts to screw stays in combustion
chambers and fireboxes shall not be less than ¾
inch thick for stays upto 1½ inches diameter over
threads, 7/8 inch thick for 1 5/8 inches and 1¾
inches stays, 1 inch thick for 1thick 1 7/8 and 2 inches
stays, and 1 1/8 inches thick for stays over 2 inches
in diameter. |
| b) |
The nuts shall be made of solid
mild steel or of iron which shall be without weld if exposed
to flame. |
Reg. 138
SCREWED STAYS
Spacing of End Stays – Allowance for curves, etc.
For the topes of fireboxes and combustion chambers the distance
between the rows of stays nearest to the tube plate or firehole
plate or back plate as the case may be, and the commencement
of curvature of these plates at their flanges shall not be greater
than the horizontal pitch of the stays. |
|
