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• # Bolt Spacing Calculation for flanges

Discussion in 'Calculations' started by mvalenti, Nov 12, 2009.

1. ### mvalentiWell-Known Member

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I have become rusty when it comes to performing hand calculations. Can someone help me with the steps involved in fastener spacing requirements for a bolted flange?

Both flange base materials are 5052 al, 0.125 thick.

Gasket is silicone sponge. 0.125 thick

Hardware 10-32 bolt.

-MArk

2.
3. ### MechEngineerMember

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Hi Mark. Is there a compression stop for the gasket to prevent overtightening? Perhaps the answer depends on the pressure within the pipe and how stiff the flange material is. Sorry to be a bit useless here but I haven't a clue. Would be interesting to know the answer. Anyone else?

4. ### mvalentiWell-Known Member

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Its actually a gasket for an access panel, for both water and EMI. Here is my problem (post coffee, earlier post was pre-coffee)....

I have a gasket, 0.63 x 0.125 thick cross section. The gasket dimensions are 40.5" long x 24.5 wide. According to the deflection curve @ 25% deflection (reccommended) I get a load of about 13lbs per linear inch. So that means a total closing force of 3225lbs.

My access panel is made from 5052 aluminum 0.125 thick, and the enclosure is of the same material and size.

I plan on using 10-32 screws to fasten the panel to the enclosure. The catalog reccommends spacing for sheet metal flanges to be 2 inches.. This seems excessive...(Book clearly states this is on the conservative side) I would have close to 30 fasteners!

I would like the deflection between bolts to be no greater than 5%. Would an evenly distributed load on a simply supported on both ends beam calc be the way to figure this out?

-Mark

5. ### mvalentiWell-Known Member

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Found it! Nevermind...

6. ### MechEngineerMember

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How did you approach the problem in the end? I would be really interested to know how you calculated it.

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8. ### mvalentiWell-Known Member

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Then confirmed with simply supported beam calcs in the end.

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