pressure on thin cylinder
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Posted by: manoj18 ®

03/23/2007, 06:37:52

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How to calculate pressure acting on thin cylinder ?
How to calculate the minimum wall thickness of cylinder on which there is an external pressure ?

thanks,

Maoj








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Re: pressure on thin cylinder
Re: pressure on thin cylinder -- manoj18 Post Reply Top of thread Forum
Posted by: jboggs ®

04/02/2007, 19:27:12

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Maoj, Are you an engineer?







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Re: pressure on thin cylinder
Re: pressure on thin cylinder -- manoj18 Post Reply Top of thread Forum
Posted by: manoj18 ®

03/23/2007, 07:56:29

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The wall thickness assumed is 2mm & the tube is perforated with 3mm holes at a distance of 10 mm from each other. The dia meter of the tube is 40mm while the height of the tube is 110 mm.







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Re: Re: pressure on thin cylinder
Re: Re: pressure on thin cylinder -- manoj18 Post Reply Top of thread Forum
Posted by: zekeman ®

03/23/2007, 13:49:22

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Perforation means that the external and internal pressures are equal and therefore, no stresses. Unless you are talking a transient.







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Re: Re: Re: pressure on thin cylinder
Re: Re: Re: pressure on thin cylinder -- zekeman Post Reply Top of thread Forum
Posted by: manoj18 ®

03/26/2007, 02:05:59

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Hello Zekeman,

Thanks for the response.

However, please note that on this thin cylinder/perforated tube, there is a filter element which will then obstruct the flow of fluid & thus there will be pressure on the tube. As the filter element clogs, there will be increase in pressure. The max working pressure is 8 bar ( 120 Psi).








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Re: Re: Re: Re: pressure on thin cylinder
Re: Re: Re: Re: pressure on thin cylinder -- manoj18 Post Reply Top of thread Forum
Posted by: zekeman ®

03/26/2007, 07:42:52

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Well, in that case , I would take the worst case of a totally obstructed cylinder and use the classic stress equation:
s= pD/2t
P= external stress
D =cylinder diameter
t= wall thickness
s and p in same units and D and t in same units verifies this dimensionally.
s would be compression in the walls; I would use a safety factor of at least 2 to compensate for stress factors due to the perforations.







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Re: Re: Re: Re: Re: pressure on thin cylinder
Re: Re: Re: Re: Re: pressure on thin cylinder -- zekeman Post Reply Top of thread Forum
Posted by: materialboy ®

04/03/2007, 10:02:21

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Zekeman is righ n regards of cirumfrentail stress on pressure vessel,

if you are looking for Longitudinal Stress (i.e. Cicumfrential Joints)

stress= Pr/t

whre, P = Pressure
t = thickness









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