Looks like a good system, but they seem to think a lot of it. Checked the price list from a local supplier. T fittings, 3/4" are $9.43 each, couplings are $4.76 ea. and 90 elbows are $7.50 each. And if I read it right, the 3/4" plipe is $2.02 per foot. Not sure how the price would work out versus copper when you figure in reduced install time, but seems high to me.

 

I am tellng you sch 40 is the cats whiskers. I put a 2" system in a furniture factory with 125 outlets over 10 years ago... no problems at all! Jesus! You are only going to put 100lbs in it! The fittings can be glued on and you can purchase everything at homeDepot! No reason to spend all that money.
The bigger pipe you use the more capacity you will have.
Big Jim

 

being a contractor we get it at a lower price, i would not use reg. sch40 pipe, breaks way to easy.........thats just me. use refrigeration copper if you do, it is alot thicker than water copper and it holds 500 psi in a/c systems also i would use 15% not 95/5.

 

ABSOLUTELY DO NOT USE PVC!

It is illegal to do so! It explodes upon impact. It explodes if stressed. It explodes with no warning at any time. It does not cool the air properly. The larger the pipe the bigger the bomb. Read the information in the read first sticky at the top of this forum.

Do the job right with the proper materials and forget about it!

 

Onetontruck only thing bout fridge line is fittings can be different and hard to locate at Lowes or depot. Besides the long lengths of the copper used for water is easier in my opinion than coiled copper and looks nicer when done if the silfloss/sweating is done right. I would use L copper if I wanted thicker then there is always K but I think M will do just fine in most home applications Ive pressure tested it to 200 psi for 24 hours on larger projects. I do agree that 15% would be the best choice to put it together with.
Glenn

 

Every house being built in this town has the entire sewer system pressured to 100lbs or more. The pipes are UNDER tons of dirt and bent in most cases to the limit of flexability.. This 100lbs or more pressure stays in the pipes for months during construction.. NONE ever explode! NONE ever crack! All that happens is a huge WHOOSH of air when the house is finaled!
Who ever said air in pvc is illegal wasn't talking about down here in Texas...
Hey that stuff is STRONG! We use sched 80 in our water wells... BECAUSE we can THREAD the pipe itself and hang 800 feet of sched 80 and a well pump and all 800 feet of pump wire on the threads!
And no it does not explode! That is big brother looking out for you'ns in all his wisdom, and bribes.
Big JIm

 

My compressor makes 175 psi no way am I gonna trust pvc or anything brittle.

 

It is legal to pressurize the pipes for testing purposes. It is not legal to use PVC for air lines in exposed locations. Read the information in the sticky at the top of the forums. The manufacturers themselves will tell you it is dangerous and PVC is not to be used for compressed gas. I doubt the sovereign state of Texas is any different.

Big Jim M- Like I said I hope you have a giant liability policy because if anything happens with any of those installations you will be liable for civil and probably criminal prosecution. Good luck with them. Do you have an E&O policy? I would contact your lawyer and notify the users of those systems so they can have them replaced.

Please do not advise forum users to use illegal materials and do dangerous things. From the legal notices:
You may not post or transmit any unlawful, threatening, abusive, libelous, defamatory, obscene, vulgar, pornographic, profane, indecent or racially, ethnically or otherwise objectionable material of any kind, including without limitation any transmissions constituting or encouraging conduct that would constitute a criminal offense, give rise to civil liability or otherwise violate any local, state, national or international law.

 

Maybe he should see some pic's of non ASME tanks bursting. Never mind plastic.

 

If you use the refrigeration copper, you don't necessarily need fittings for most of it - the copper to copper joints can be made by swaging and soldering. And yes, regular solder can hold hundreds of PSI. Brazing is more secure, but overkill for a couple hundred psi. Seen lots of commercial ref. stuff put together with 60/40.

 

i will say this one more time, the abs air line that i told everyone about is LEGAL.100% PERIOD. that said "i would not use normal pvc shc40 for air line".we tested the abs air line today it cracked open and let the air out. at over 600psi. go to the web site and read. this is what alot of contractors use now, 2nd would be black iron. black iron is alot harder to work with and dirty. must use their glue and all. do not use pvc glue.
price's for anyone that walks in the door is:
1) pipe 1/2" 20foot @ $1.04 per foot
2) 90's 1/2" $5.09
3) tee 1/2" $6.10
4) couping 1/2" $3.59
5) 3/4" pipe $1.55 per foot
6) 3/4" 90s $6.15
7) 3/4" tee $7.62
8) 3/4" coupling $3.84
i will not say anything about this any more i just wanted to get this info out there. now, DO NOT USE REG. PVC SCH40 OR WHATEVER FOR FOR AIR LINES. thank you and have a nice day.

 

What in the world do you do with 175lb pressure? What kind of pump is that? I put 2 $20,000. pumps in the furniture factory and they only put 120lb inthe system.. I guess there is something that uses 175lb but I am unaware of it. Fill me in ok? If you are over taxing your pump you are wearing it unusually fast.
I try to run my pumps to the max that will be used by the tools in the system.
I also try to oversize the system pipes to make room for more air storage.
I will not advise using pvc on this site anymore.. It seems everyone here is opposed to using it even in a home shop.
However remember to install a short pipe under each outlet so the condensation has a place to accumulate.
Having all horiontal pipes with a slight downhill slope and the tees pointing UP will allow the condensation to run down the pipes to the last outlet and ONE condensate drain can be installed there..
Big Jim

 

We use 250 psi air-to-head to start our engines at the pipeline station I work at. We also use it for jet assist air on the turbochargers.


Ryan

 

Most Industrial grade 2 stage compressors all make at least 175 psi... I use it for sand blasting..

 

General all around single stage compressors cut out at 120-125 psi. Two stage cut out at 175 psi. Try ti fill tires on a 18 wheeler with 120 and it will take an hour. Most industrial shops use two stage.
.....=o&o>.....