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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. |
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