Thinking of using PVC pipe for air?

[SteveHGraham]

Yes, I know what table salt is. There are other salts of chlorine. I said "salts" because I didn't know what the chlorine turned into after reacting with pee, mucus, sweat, dead skin, excrement, and so on. I figured maybe the machine was able to salvage some of the chlorine by breaking up some of the compounds it formed. I read about it today, and it's impossible to get a straight answer, because 99% of the sites that mention electrolysis chlorination are trying to sell the machines. One site says the chlorine rejoins the sodium on the way back to the filter.

The Genie-Chlor people used to bring salt in, in bags the size of pillows. Today I read that the pool my family had would have required 1,000 pounds of salt in order to get the chlorination process up and running.

The prep school I went to before high school shocked its pool one day and promptly put us in it. The pool was outdoors, and you could smell the chlorine fifty feet away! In classes later that day, the kids could barely see.

[John Hasler]

The chlorine ends up forming various complicated compounds with the organics. The sodium forms sodium hydroxide.

> One site says the chlorine rejoins the sodium on the way back to the filter.

Don't buy anything from them. They know less than nothing about their product.

[liveaboard]

I used PEX tubing; runs through 3 shops and a short spell underground.
I have no idea if it's good in the long run, but it works great now.

[b4autodark]

They bypassed the safety switches! And they weren't just using PVC for air...they were using it for an explosive gas! That's Darwin territory.

In fairness, I would imagine hydrogen would also blow iron pipe into smithereens.

Not surprised that it happened at a university. Common sense and the kind of sense that helps people get good grades are not always found together.

[You wouldn't want to use iron pipe around chlorine.]

What do you base this on? I worked as a plumber at a major city water works and we had liquid chlorine delivered by railroad tanker to the filter plant. All the piping was schedule 80 socket welded carbon steel pipe from the railcar platform to the diffusers, the entire system. Even the railroad tanker was carbon steel!

We had to disassemble certain portions of piping annually for inspection, I never remember and corrosion. We chlorinated steel water mains whenever we got done working on them. They carry chlorinated water their whole service life.

[Mr Ron]

I have heard good and bad things about using PVC for compressed air. When it shatters it can be lethal is one. I have used it for years in my shop and have not had any problems with it. My thoughts on PVC for air is: to run PVC in places where it will not be exposed to people, so if it does explode, it won't harm anyone. Use it only for low pressure <100 psig.

[tornitore45]

I understand it like this:
You can compress air
The energy from compressing it is being held by the pipe
You cannot compress liquid
Compressor technicians fill air tanks with water when they pressure test.

The energy of compressing air is stored 99.99999999% in the air and the balance is stored in the pipe.
Pipes, like water are uncompressible (to a certain extent) that is why water, like steel, stores only a infinitesimal energy when compressed during pressure testing.

On the other hand metal bending may store large energy like a spring.

[steamin10]

DO NOT USE PVC WHERE THERE IS OIL, OR SUN. Better to use a rubber line and wind it around the shop. When the pvc degrades it will blow at the least cause, and the shattered pieces are missiles that are unpleasant. Spend a dollar and avoid the rush.