Which type of formed threads are used for vertical pressure vessels in the pressure range of 0.1 N/mm to 1.5 N/mm?

Which type of formed threads are used for vertical pressure vessels in

1.	Which type of formed threads are used for vertical pressure vessels in the pressure range of 0.1 N/mm to 1.5 N/mm?
A.	Plain formed head
B.	Torispherical dished head
C.	Semi-elliptical dished head
D.	All of the above
Answer» C. Semi-elliptical dished head

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Which type of formed threads are used for vertical pressure vessels in the pressure range of 0.1 N/mm to 1.5 N/mm?

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