The internal diameter of a cast iron pipe is 300 mm and its thickness is 10 mm. If the pipe is supported at two points 8 m apart, what is the internal cross-sectional area of the pipe as per IS:1239 (Part 1)?

A) 0.0707 m2
B) 0.0616 m2
C) 0.0524 m2
D) 0.0491 m2

As per IS 1239 (Part 1)-2004 for Pipes, the internal diameter is 300 mm or 0.3 m.

The internal radius r = (Internal diameter/2) = 0.3/2 = 0.15 m

The internal cross-sectional area A = πr2
= π x (0.15)2
= 0.0707 m2

Therefore, option A is the correct answer.