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PVC Propane Meter (cheap)

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PVC Propane Meter (cheap)

Unread postAuthor: SpudStuff » Sat Apr 22, 2006 11:24 pm

I have heard that pvc propane meters are un safe because the propane makes them cold and there for brittle. I dont have 50 dollars to make one so i improvised.

The Parts list is as follows:

2x 1/2" sch 80 close sprinkler risers.
1x 1/2" sch 80 4 inch sprinkler riser
2x 1/2" pvc mall valves
1x 1/2" threaded pvc cap
1x 1/4" F x F x M tee
1x 1/4" pressure gauge( rated to at lease 130 psi)
2x 1/4" street elbow
1x 1/4" x 1/4 hose barb
4x 5/8" stainless steel hose clamps
1x 1/4" pressure rated hose ( try hose for hooking up tolites)
1x 1/2" x 1/4" bell reducer
1x 1/4" close nipple
1x old propane torch head

The tools needed are:

1. 1/4" pipe tap
2. ajustable wrench
3. 7/16" drill bit
4. power drill
5. lots of teflon tape
6. more teflon tape

Go From The Bottom Up


How-To By Holy S*^# Its Still Going
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Attachments
CIMG2767.jpg
Parts Needed
CIMG2770.jpg
Tools needed
CIMG2771.jpg
Step 1
Drill the 1/2 inch cap with a 7/16 drill bit.
Get the hole streight then with the tap thread the cap. one turn in 1/4 turn back
CIMG2775.jpg
Step 2
Wrap a 1/2 inch close nipple cloch wise with teflon tape and thread into the cap. then wrap the other end
CIMG2777.jpg
Step 3
Thread into the ball valve and tighten
CIMG2784.jpg
Step 4
Wrap the end of the 4 inch long nipple in teflon and thread into the other side of the ball valve
CIMG2786.jpg
Step 5
Thread the other ball valve onto the 4" long nipple.
CIMG2792.jpg
Step 6
Thread the 1/4" nipple into the bell reducer with teflon
CIMG2801.jpg
Step 7
wrap the nipple with teflon and thread the assembally onto the 1/4 inch street elbow
CIMG2795.jpg
Step 8
wrap both ends of the remaining 1/2" nipple and thread into the ball valve.
CIMG2803.jpg
Step 9
thread the elbow assembally onto the nipple
CIMG2805.jpg
Step 10
Wrap the male outlet of the tee in teflon and thread into the hole you tapped
CIMG2821.jpg
Step 11
Wrap the threads of the gauge with teflon and thread into the tee
CIMG2810.jpg
Step 12
Cut the torch off just before the bend and use a file to bake off any rough edges
CIMG2812.jpg
Step 13
Put two hose clamps on one end of the hose
CIMG2815.jpg
Step 14
push the hose onto the torch head and tighten the hose clamps
CIMG2816.jpg
Step 15
Repeat step 15 but with the hose barb
CIMG2825.jpg
Step 16
wrap the hose barb in teflon and thread in to the othe street elbow.
CIMG2826.jpg
Step 17
wrap the elbow in teflon and thread into the tee.
CIMG2827.jpg
Step You're Done
Connect a propane tank to the forch before attaching to cahmber. make sure all valves are open except the one closest to the chamber connection.
The guage should tead about 90 psi.
Squirt the meter in simple green and check for bubbles(leaks) if there are any wrap the leak area more teflon.
CIMG2828.jpg
Locate where you want the meter on your cannon. i put mine over the electrodes to trevent shocks.
Carefully drill the hole for the tap with the 7/16" bit. Always drill on a joint where the pvc is twice as thick.
Take your time and get it streight.
CIMG2831.jpg
Tap the hole using the same method as before. Take your time. Quality Counts.
CIMG2832.jpg
carefully, so as not to damage the threads, Thread the finished meter into the hole
CIMG2835.jpg
A mini Gun Style grip works great
Last edited by SpudStuff on Tue Apr 25, 2006 8:29 pm, edited 1 time in total.
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Unread postAuthor: Benny » Sat Apr 22, 2006 11:39 pm

sweet, im definatly going to use this on my next combustion. :D
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Unread postAuthor: Ballad_Black » Sat Apr 22, 2006 11:43 pm

Nice design, but you could build the same thing with metal parts for only a few bucks more. The Lowes here in town has the metal ball valves around 1 or 2 bucks higher, but the pipe woul prolly run you a bit more than a few inches of pvc.

Nice design though, how much did it run you to build?
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Unread postAuthor: SpudStuff » Sat Apr 22, 2006 11:44 pm

make sure to use fueltool to caculate the size of the meter pipe for your cannon. Set the supply tank pressure to 90 psi, and the meter pipe size to 1/2 inch
I think it cost $9 for the body of the meter, $4 for the torch head at the local flea market, $5 for the guage, ~$10 for the rest. you can use much cheaper hose though.

So ~ $28 total
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Last edited by SpudStuff on Sat Apr 22, 2006 11:48 pm, edited 1 time in total.
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Unread postAuthor: HAYLO_Stealer » Sat Apr 22, 2006 11:47 pm

when i build these they never have enough oxygen to fire.
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Unread postAuthor: SpudStuff » Sat Apr 22, 2006 11:48 pm

your meter pipe is too big or you havent vented your chamber well enough

EDIT: It could be that you have too much pressure going to the meter from the tank

It could also be you dont have enough fuel
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Unread postAuthor: saladtossser » Sun Apr 23, 2006 1:30 am

great tutorial, i like it, glad someone is taking the time to help new folks

instead of using that cap, why not just use a bushing and save a buck or two? it will be a lot easier too

and instead of that hose barb on the T, use a 1/2" male npt to a male compression fitting, so the hose screws right on without hose clamps.

my meters are similar but i only have one blowgun as a valve, whats the point of having 2 if you dont have a reg and is eyeing the guage anyways?

brass valves would look wicked

HAYLO_Stealer, try trying different psi in the meter, that should always work.

ps, nice Adidas shoe box
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Unread postAuthor: HAYLO_Stealer » Sun Apr 23, 2006 1:40 am

i know i should look it up but a 7 inch by 3 inch chamber(mini) how big would it need to be ?
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Unread postAuthor: CS » Sun Apr 23, 2006 12:29 pm

I already commented on this in another post, but nice usage of the steel braided hosing. If indeed propanes highest pressure before it liquidizes is 90 psi, a 100 psi would suit this application. This also would give a greater accuracy when it comes to readings, because a 200psi gauges numbers are squished together more in a attempt to fit twice amount of numbers and lines on the same dail.

Nice tutorial. Something that newer members will use, and older members will take something from. (Im talking about myself, because the metal tubing is going on my next cannon.)
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Re: PVC Propane Meter (cheap)

Unread postAuthor: saladtossser » Sun Apr 23, 2006 1:30 pm

Holy S*^# Its Still Going wrote:2x 1/2" sch 80 close sprinkler risers
1x 1/2" sch 80 4 inch sprinkler riser


what and where?
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Unread postAuthor: CS » Sun Apr 23, 2006 2:20 pm

The first is found connected to the ball valves, and the second found between the two ball valves. Sprinkler risers are the same thing as nipples.
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Unread postAuthor: SpudStuff » Sun Apr 23, 2006 5:28 pm

instead of using that cap, why not just use a bushing and save a buck or two? it will be a lot easier too

youre right today i was worling on my chamber and it fell. the close nipple between the first ball valve and the cap broke. i had to replace the valve and i used a bushing instead

pimpmann22 is it posiple to post this in the offical section?
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Unread postAuthor: boilingleadbath » Mon Apr 24, 2006 8:41 pm

I'm not sure why we can't, but we'd have to get express permission from PC guy - to tell the truth, there are several "junior" how-to's and such I'd like to see moved.

Rumor has it that we'll have an automated submission system in a few months or so, though, so he may not approve and we'll just have to wait.
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Unread postAuthor: SpudStuff » Tue Apr 25, 2006 8:04 pm

oh that works. the guage all the sudden sprung a leak on me. i would say it was a small explision because the pressure bent the thin face of the guage.
i am going to build a metal one and stock up on parts because the local plumbing store is giving a 50% discount on pvc and pvc fittings. :D :D
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Unread postAuthor: wangpushups » Sun Nov 04, 2007 6:56 pm

I wonder if you could make your entire meter out of pvc??? It would be way lighter than metal, it would look cooler, i think, and you could just pvc-weld it to the chamber with a 90 degree elbo, but how much psi could it hold? Just an idea.
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