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Reg. 185
SHELLS


Circumferential and End Seams of Water Tube Boilers

The suitability of circumferential seams including the seams joining ends to shells shall be verified by the following formula : -

K x J x  (t-2)

is equal to or greater than W.P. Eqn. (17)
D x C

Where
K = 150 for 26/30 tons tensile plates.

K = 157 for 28/32 tons tensile plates.

        Due to higher stresses, see regulations 271 and 340.

WP = The working pressure in lbs per sq. in.

D = The diameter of shell in inches, measured inside the outer ring of plates.

J = Circumferential Joint efficiency calculated by Eqn.2 or 3.

C = 8.24 where the seams are made with lap joints and are treble riveted.

= 8.44 where the seams are made with lap joints and are double riveted.

= 9.60 where the seams are made with lap joints and are single riveted.

t = thickness of plate in 32nd of an inch.

 
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