Posted by: manoj18 ® 03/23/2007, 06:37:52 Author Profile eMail author Edit

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 Author Profile eMail author Edit

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 Author Profile eMail author Edit

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 Author Profile eMail author Edit

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 Author Profile eMail author Edit

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 Author Profile eMail author Edit

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 Author Profile eMail author Edit

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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