I got my Pressure Pot now how do i use it

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RyanNJ said:
My devilbiss pressure pot arrived today. how do i use it (i bought it used so it did not come with directions
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YEA! A DeVilbiss pot! I would contact Curtis O. Seebeck (MesquiteMan). He is an authority on casting and pressure pots. He also just quit "dippin" and would likely welcome the diversion:biggrin::biggrin::biggrin:
 
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do i have my pot set up rite? also what do i do about the fitting in the blue circle
 
The picture is too small for me to see too acurately what I am looking at. If that fitting where the blue is, is an open hole that air can go through, you need to pull that fitting out and install a plug. I do not see a safety pressure release valve on that pot...I can't force you to use it, but I can't recommend that you don't have one. I also do not see a ball valve..although it might still be there but hidden. Should have a ball valve between the guage and the quick disconnect. You hook up the hose to the quick connect, then turn on the valve to fill the pot, then when full you turn off the valve and un hook the hose. To remove the air from the pot, you then turn the valve back to on and you can control the speed of which the air leaves as well using the valve.

Inside the lid, directly under the guage, that is where the air goes in to the pot. You should have a 90 degree elbow or a T installed to divert air to the walls of the pot as it enters rather than having it blow direct down on to your resin.

On the bottom inside the pot you should cut a round piece of plywood and insert it down there because most pots are concave in the bottom and the wood will give you a flat place for your mold to sit. Covering the plywood with wax paper is a good idea because if you drip some resin over the mold to the wood, it could stick your wood and mold together.
 
Here are some more picures
Over all picture of the lid
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this picture shows the fitting in question. so i need to remove both parts and install a cap (can i get that at Home Depot or are there special caps for pressure pots?
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This the the inlet under the pressure gauge, how would you clean the threads so that a T or elbow can be installed?
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Ditch the regulator completely. You will be regulating the amount of pressure yourself with the ball valve. Leaving the regulator on the pot just adds weight to the lid and more potential for leaks. Here is a picture of one of my pots for reference. I have also included one of my old HF pots that has a similar pressure relief valve to give you some ideas.
 

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Yep...like Curtis' pot is real good. The plug will be available at any hardware store, as will all the parts you need, although if you don't have a safety relief valve then I don't know where you get that. My pot has a different type of safety valve and it goes in that second hole instead of a plug. It is a vertical safety valve and much smaller and better than the HF style in my opinion because it doesn't have that flimsy ball nut connection on the bottom of it where if you tighten it up too much you break the ball or nut in half. I always had issues with that HF style relief valve leaking air on me. As you can see by the way Curtis set his up too, the weak point on that valve is less of an issue because he is also using it in the second hole instead of a plug and filling the air in hole #1 so that the human pressure of putting the hose on and off does not break the safety valve.

Incidentally..that "pull thingy" is the safety valve.

There's lots of ways to do it...just remember that there is dangers involved when working with pressure, so try and play safe.
 
Doh! I should have looked more closely. You do have a safety valve on your pot. Just do like Curtis did..unscrew the regulator off the safety valve and unscrew the guage then screw the guage into the top of the safety valve. Then install your ball valve and quick connect in the other hole. Also, inside the lid for the other hole is where you elbow will go because that is the hole the air would be entering the pot.
 
Be Careful! Even with the best of pots high pressure can be very dangerous! Stand out of the way when pressurizing the pot!
 
RyanNJ said:
ok thanks for the tips, any safety measures except stand out of the way that i should take?
Click to expand...

Biggest thing I keep reading about, is over-pressuring the pot. Alot of folks have been running the pressure way up there, and failures have occured(probably more then what has been reported).


It might not something that is do-able on the funds you have, but a safety cage to put the pot in would be an excellent idea? Similiar to those that are used for tire inflation(at least in the safe shops).




Scott (don't it if it makes you think 'hmmmmm') B

P.S. Where did you end up getting the pot?
 
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SDB777 said:
Biggest thing I keep reading about, is over-pressuring the pot. Alot of folks have been running the pressure way up there, and failures have occured(probably more then what has been reported).


It might not something that is do-able on the funds you have, but a safety cage to put the pot in would be an excellent idea? Similiar to those that are used for tire inflation(at least in the safe shops).


Scott (don't it if it makes you think 'hmmmmm') B

P.S. Where did you end up getting the pot?
Click to expand...


i got the pot on ebay.. how do i tell if my pressure gauge is working correctly to know if i have a problem of over inflation
 
Visually inspect the pot. Is it all dinged up like it's been kicked around or any evidence of it being dropped? That would not be good. If there is dings in the pot, toss it. If it is dropped, toss it. The pot should be perfectly round inside. If the pot is completely round, then the pressure will evenly spread itself inside the pot. If the pot is not round, then the longest sides will expand pulling the shorter sides inwards, basically, the pot collapses in on itself on two sides and out on two sides which will in turn pop the clamps and shoot the lid upwards. I do not know how to tell if a pot is perfectly round, but I know that if it is oblong to a certain degree then you can visually see it and should be suspicious. I had a pot that was out of round and it blew out. It was not some big explosion for me..just the pot crushed, the lid popped off and flew just a few inches landing on the floor and the pot fell on its side. I typically use 55 lbs of pressure.

Getting away from the safety aspect, I would also like to recommend you install an air dryer on your compressor if you do not have one. Some resins hate water and moisture. You can get a decent air dryer for around $30 that installs fairly easily...in line air dryer.
 
Casted today. I have bubbles initial but I will try again

I had air leaking out so I had to unpressurized it and sand the burr down and then I retightened it down with a wrench. I will post pics tommarrow
 
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