If d is the diameter of the pipe, p is the total internal pressure, f – McqOptions

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1.	If d is the diameter of the pipe, p is the total internal pressure, f is the permissible tensile stress and n is the effective of the joint, the thickness t of metal pipe, is
A.	n (pd/2f)
B.	(1/n) (pd/2f)
C.	(1/n) (pd/3f)
D.	(1/n) (pf/d)
Answer» C. (1/n) (pd/3f)

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