plastic tubing vacuum rating formula Question
Post Reply   Forum
Posted by: ghamgaha ®

03/20/2006, 17:12:13

Author Profile eMail author Edit

I'M TRYING TO FIND A FORMULA FOR THE MAXIMUM VACUUM A SPECIFIC PLASTIC TUBE CAN WITHSTAND BEFORE IT COLLAPSES. I WOULD LIKE TO BE ABLE TO INPUT THE CHARATERISTICS OF THE PLASTIC AND TUBE SIZE. IF ANYONE KNOWS OF SUCH A FORMULA IT WOULD BE GREATLY APPRECIATED. THANKS GARY







Post Reply | Recommend | Alert Administrator View All   | Next |

Replies to this message


Re: plastic tubing vacuum rating formula
Re: plastic tubing vacuum rating formula -- ghamgaha Post Reply Top of thread Forum
Posted by: zekeman ®

03/21/2006, 22:27:19

Author Profile eMail author Edit

First find out the compressive strength, s and then formula
pd/2t=s
Then solving for p,
p=2ts/d

where;
t= tube thickness,inches
d= diameter, inches
s= compressive strength of plastic, lb/in^2








Post Reply | Recommend | Alert Administrator Where am I? Original Top of thread | |
Re: plastic tubing vacuum rating formula
Re: Re: plastic tubing vacuum rating formula -- zekeman Post Reply Top of thread Forum
Posted by: zekeman ®

03/21/2006, 22:32:35

Author Profile eMail author Edit

Please note in the above, that p is the differential pressure between the outside and inside of tube. If the outside is atmosheric, then
p=14.7-pvac







Post Reply | Recommend | Alert Administrator Where am I? Original Top of thread | |
Re: plastic tubing vacuum rating formula Smile
Re: Re: plastic tubing vacuum rating formula -- zekeman Post Reply Top of thread Forum
Posted by: ghamgaha ®

03/23/2006, 10:05:16

Author Profile eMail author Edit

THANKS FOR THE HELP.
I THOUGHT THERE HAD TO BE A COMPRESSIVE FACTOR INVOLVED.
IF IT WOULDN'T BE TO MUCH TROUBLE, DO YOU HAPPEN TO HAVE THE NAME OF THE TEXT YOU HAD THIS FORMULA IN? I WOULD REALLY LIKE TO GET SOME BACKGROUND ON THIS.
THANKS AGAIN FOR THE HELP!!!
GARY







Post Reply | Recommend | Alert Administrator Where am I? Original Top of thread | |
Re: plastic tubing vacuum rating formula
Re: Re: plastic tubing vacuum rating formula -- ghamgaha Post Reply Top of thread Forum
Posted by: comp ®

03/26/2006, 06:45:25

Author Profile eMail author Edit

waiting to hear







Post Reply | Recommend | Alert Administrator Where am I? Original Top of thread

Powered by Engineers Edge

© Copyright 2000 - 2024, by Engineers Edge, LLC All rights reserved.  Disclaimer