gasoline in hdpe Pipe at high pressure and at room temperature

[suzanparvez]

Can anyone provide me some data with gasoline in HDPE at high pressure : effect of gasoline on mechanical properties of hdpe pipe at high pressure and room temperature

thanks in advance

 

[dcasto]

It's a no-no. HDPE in natural gas gathering service is usually derated by 50% to compensate for small amounts of "gasoline". The temperature design for HDPE is 72 degrees (i think thats it) as a base and temperatures above that call for derating also. The componets of gasoline cause the HPDE to get soft and swell. I've even gone in and did work on 4" pipe that hade about a 5" OD after being in service for 2 years on gas that is very high in gasoline content. This was before the HDPE manufacturers added a derateing for it.

 

[suzanparvez]

Thanks a Lot Dcasto. How about at room temperature but at 750 psi ? Have you done some tests with this condition ?

 

[NickE]

Does putting gasoline in a HDPE at any pressure and any temperature sound like a "Very Bad Idea" to anyone else?

 

[dcasto]

I would guess that higher pressurres the gasoline would enter the pores faster and excellerate the deteriation. I've not tested this in a lab.