Flanged pipe joint: bolt circumferential pitch for a leak-proof joint For a flanged pipe joint, what range of circumferential pitch (bolt spacing along the circle), in terms of the bolt-hole diameter d, helps ensure a leak-proof joint? Choose the correct range.

Difficulty: Easy

Correct Answer: Between 20d and 30d

Explanation:

Guideline
For leak integrity and uniform gasket compression, typical design practice keeps circumferential bolt pitch within a moderate range.

Rule of thumb
A leak-proof flanged joint generally uses circumferential pitch: 20d ≤ pitch ≤ 30d.

Common pitfall
Too large a pitch risks local gasket relaxation and leaks; too small a pitch is uneconomical and unnecessary.

Final Answer
Between 20d and 30d

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