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here's another link to a similar pipe like AirPro by ASAHI. http://www.vinkkunststoffen.nl/Default.aspx?ID=6556

Check this out... http://www.cpchem.com/hb/getdocanon.asp?doc=138&lib=CPC-Portal

Thanks for the heads up stanweld. I did think about the chlorides in the ground but since we are using clean fill and the soil is not contaminated, I believe the SS is still the safe.. or safer.. way to go. ...and yeah, it's only money right? :/ jdarco: I had not heard about this pipe. I will...

No cooling probs here. I don't see temperature as the driver to discard the HDPE pipe. The fact that oxygen permiates into the wall of HDPE is the concern. Yellow HDPE pipe used for gas does not have a problem because there is no oxygen in Natural Gas. I see what you are saying about internal...

Thanks for all of the input. Like Ashereng said. The air coming out of the compressor goes through an aftercooler, a pulsation bottle, a dryer and a filter. All of this piping will be galv. CS thus helping dissipate the heat. When it goes underground the temperature of the ground will help...

OK, thx for the input. I'm trying to aviod CS because of the coating and cathodic protection involved... If I can't go with HDPE then I will go with SS. ...it requires a 2" line from compressor to bollards. I was suprised as to how well the bollards hold up against impacts!

This pipe will be used to connect a compressor to a bollard system. Basically muscle air to raise the bollards.

I have not spoken to the manufacturer yet. That's my next step... I do not see this pipe going over 80°F. Thx for your reply!

I have been doing some research on this topic and I've found that there are mixed feelings. My question is, can I use HDPE pipe (DR7) for an underground compressed air system at around 170psi? I'll start with what I found. B31.8 has a limit of 100 psi on thermoplastic pipe. But this is for...

...so I made a couple trial runs with different "Height Above Ground Level" inputs. I have to say that in CAESAR version 4.50_****07 the results are exactly the same. Results are not affected AT ALL by this input. The wind IS affected by the global coordinates you specify to the first point...

Anyone?

When specifiying wind loads, CAESAR asks for a "Height Above Ground Level". There's been some uncertainty as what this means, is this grade elevation or is this the HEIGHT ABOVE GROUND LEVEL? i.e., if the first node of my pipe model is at 115'-0" and grade is at 110'-0". Is the input...