Polypipe service over 140

[MIKE.PE]

Hi all,

I am curious if anyone has information for operating polypipe (slightly) over 140F. I have been buying high temp rates poly up to 180F because I can see brief temperatures up to 145. There seems to be no published data for regular temp poly over 140. My pressure is 1/2 of the MAWP at 140F but I don’t have any knowledge of how the pressure vs temp curve acts after 140F. Is it semi liner where I could extrapolate or does it fall off quickly after 140. The goal of this excessive is to see if I can get comfortable using non high temp poly for the brief temperature excursions above 140, particularly since I am less than 1/2 MAWP operating pressure.

Thanks

 

[chicopee]

By Poly pipe, do you polyvinyl, polystyrene, polyethylene, polycarbonate and the list goes on. Once you know the type plastic, try to get data sheets from suppliers or manufacturers. One of these entities has that published info. If no luck, get a copy of the machinery handbook or ME handbook and research the section on plastics. As a matter of fact research the net has there are published data. Trade magazines or other ME periodicals do have sections on plastics listing the data that you need.