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sch 80 conduit pvc?

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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sch 80 conduit pvc?

Unread postAuthor: dobieharris » Sun May 06, 2007 11:42 am

while new to pneumatic cannons,ive bulit a few combustion guns,but when i went to my local home depot to build my first pneumatic,i found they only sell white sch 40 pvc and id like to use sch 80 if i can,which i did find in the elcetrical dept with it being called conduit,"gray in color"..it has no pressure ratings on it as i know it is used as conduit,but ive seen pics of several cannons and they claim to use sch 80,which is also a gray color.can someone tell me if im able to safely and coreectly use this sch 80 conduit and if its the same others are using??i know i can build it from sch 40,but i like safety and money is no object when it comes to safety.thanks,dobie.
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Unread postAuthor: hi » Sun May 06, 2007 12:01 pm

If its under 2'' i would say its safe for 100 psi, but if its safty you want then use sch40 that IS pressure rated rather than SCH80 that is quesionable. Im sure its safe, but it is not designed for pressure and the sch40 is designe for pressure. if you really really want to be safe then use copper.

bottom line, i would use the sch 40 because it is designed to hold pressure.
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Unread postAuthor: frankrede » Sun May 06, 2007 12:02 pm

Counduit isn't sch-80.
It just has the similar color.
sch-40 pvc is safe up to common pressures such as 150 psi and below.
As long as it has a pressure rating
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Unread postAuthor: dobieharris » Sun May 06, 2007 12:22 pm

i'm afraid to disagree with you on conduit not being sch 80,because i seen some at home depot in electrical section that says sch 80 on it,but it does not have a pressure rating on it,as i know it is used for conduit,but im asking if its the same sch 80 that others are talking about when they say they used sch 80 to build thiers?i know that the common answer that i will get is that if it doesnt have pressure ratings on it,dont use it,but im asking do they make sch 80 for plumbing with pressure ratings or is the sch 80 that people are using, really sch 80 conduit?home depot only has sch 40 with pressure ratings,which home depot sux anyway.maybe the correct sch 80 is found at a plumbing supply store?,thanks
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Unread postAuthor: WOW!! » Sun May 06, 2007 12:37 pm

frankrede wrote:Counduit isn't sch-80.
It just has the similar color.
sch-40 pvc is safe up to common pressures such as 150 psi and below.
As long as it has a pressure rating


Yes it is, it has a thicker wall for under ground applications. They have to be a certain wall thickness for code reasons, and I would use it, but if you blow your self up or get hurt its not my fault :lol:
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Unread postAuthor: frankrede » Sun May 06, 2007 12:41 pm

Ohh.
Cause my owes has sch-80 pvc sch-40 pvc then conduit.
I'll go check later if my conduit is as thick as my sch-80. I still don't think it is.
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Unread postAuthor: ArticWolf » Sun May 06, 2007 12:48 pm

Sch-80 Can be bought from a plumbing store I know because I've seen it and it is white and is a NSF-PW pressure rated as well. It must have a pressure rating on it to be pressure rated if it isn't printed on it then it isn't pressure rated. I use SCH-40 NSF-PW (other than the clean out cap which is DWV, I know I shouldn't use that but that was all they had) for my combustion cannon. But if you have to, find a local plumbing store and if they don't have pressure rated SCH-80 then have them order it for you.
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Unread postAuthor: dobieharris » Sun May 06, 2007 1:13 pm

thanks for the info guys,i think my best bet is to build it out of sch 40 that is readily available and everyone seems to use it.i will install a pressure guage and it seems to be safe as long as used within reason.i just thought that since i saw the sch 80,which is conduit,id find out if i could use it and if it was the same stuff others have used.i agree that since it has no pressure rating,it is safer to use sch 40 with a known rating than use the sch 80 with no known rating.i see sites that sell air cannons and they all seem to use sch 40,so it must be safe within recommeded usage.im not trying to be cheap as safety has no price,but i have come to realize that even if i were to order the sch 80,then i will prob run into probs finding the fittings to be sch 80 and by using sch 40 fittings,then i havent accomplished much?i,ve seen pics of guys using sch 80 for the chamber,which is gray,but the fittings are white,which lead me to believe they are sch 40.i may have answered my own question,but you guys have been helpful.
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Unread postAuthor: dobieharris » Sun May 06, 2007 1:39 pm

one more question,i now know that im not using the sch 80 conduit,but isnt sch 80 of any pipe,the same thickness?just curious.i thought the schedule size was the thickness of a pipe,no matter what its made of?thanks
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Unread postAuthor: ArticWolf » Sun May 06, 2007 1:50 pm

I'm not sure if there is a difference other than the contact surface which is longer than SCH-40 but other than that, make sure when you do get the fittings that they areNOT Cell core pvc!!! always get solid core pvc. Cell core pvc is not safe to use it might blow up sending shrapnel every were and it could kill you or hurt you very badly. And the SCH-80 you were talking about sound's to me as being ABS but I could be wrong.
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Unread postAuthor: dobieharris » Sun May 06, 2007 2:14 pm

the schedule 80 i saw in home depot was pvc,it did say that on it along with sch 80,but like i said,it didnt have any pressure ratings on it.i have decided against using it either way as you see in my previous messages,but id thought id let you know that it was sch 80 pvc conduit,unless you are refering to the abs as being used on the guns i have seen on here with a gray color air chamber?that could be,but they also use white fittings,which leads me to belive the fittings are most likely sch 40 because if you have a home depot like mine,then you are always limited on what you can get.i came to the conclusion that if i cant easily get sch 80 pressure rated pvc and the fittings,then i might as well do what most do and build it from press. rated sch. 40.didnt make much since to me to build chamber of sch 80 and fittings of sch 40.i could porb. order it all,but i can see the frustration with the guy at the plumbing store when i ask him to see alot of different fittings,trying to piece together a spud gun at the counter,lol. home depot sux!
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Unread postAuthor: frankrede » Sun May 06, 2007 2:20 pm

dobieharris wrote:thanks for the info guys,i think my best bet is to build it out of sch 40 that is readily available and everyone seems to use it.i will install a pressure guage and it seems to be safe as long as used within reason.i just thought that since i saw the sch 80,which is conduit,id find out if i could use it and if it was the same stuff others have used.i agree that since it has no pressure rating,it is safer to use sch 40 with a known rating than use the sch 80 with no known rating.i see sites that sell air cannons and they all seem to use sch 40,so it must be safe within recommeded usage.im not trying to be cheap as safety has no price,but i have come to realize that even if i were to order the sch 80,then i will prob run into probs finding the fittings to be sch 80 and by using sch 40 fittings,then i havent accomplished much?i,ve seen pics of guys using sch 80 for the chamber,which is gray,but the fittings are white,which lead me to believe they are sch 40.i may have answered my own question,but you guys have been helpful.

If its white. its sch 40 usually.
I suggest you use sch-40.
Its is fine for what you are doing, sch-80 is overkill, just use sch-40, its cheaper, and easier to get
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Unread postAuthor: ArticWolf » Sun May 06, 2007 2:35 pm

Thats the way to go Dobie. The guy at my plumbing store didn't mind my buy my stuff for my spud cannon he actualy wants to see it when I am done with it which I am but after the contest I want to mod it a litte bit and finish off my remote ignition made possible by 25 foot of wire. I'm still toying with cat-5 network wire though. check out my cannon when you get a chance and let me know what you think of it http://www.spudfiles.com/forums/spudzilla-v-1-0-t7914.html
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Unread postAuthor: dobieharris » Sun May 06, 2007 2:46 pm

hell of a spark i can say.
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Unread postAuthor: ArticWolf » Sun May 06, 2007 2:54 pm

Yea I know it is a 650,000 volt stun gun with a 1/4 gap the brass screw's help they are more conductive. Oh yea I just finished the remote ignition using cat-5 network cable, they said it couldn't be done but I love proving people wrong.
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