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

1 Answer

Answer :

(B) (1/n) (pd/2f) 

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