2-1/2 Gal Pressure Tank
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Placed an order for one of these. With it on sale for $79.00 .. and $6.96 flat rate shipping .. figured to go for it.

Decided to “go for it” as I said. To get good resin castings so that all the voids and all the details are filled you need to cast under pressure. I would hesitate to run this up to 50psi .. but it should work fine at around 30psi. I believe that may be enough. In the reviews I found …

We bought this 1 1/2 years ago and I converted it to use as a degassing chamber/injection molder. I just added a few valves and gauges and use an external vaccuum generator. This tank withstands vacuum over 29 inches of mercury and pressures over 85 psi with no ill effects. (I did cast an “in situ” silicone gasket to replace the factory seal.) We have done hunderds of castings and it’s still going strong. I’m looking to buy another one.

For Sculptors and prototypers this tank takes a beating like a WWII tank. Mine is set up as a pressure tank for pressurizing silicone or resin. I have pressurized it up to 60 to 70 PSI and never had a problem. Now I use it from 30 to 60 PSI. I have done hundreds of casts and dozens of silicone molds, and never a problem or leak!!!! I’m looking for another.

That first quote .. if I am reading that correctly .. is saying he/she is using it both as a vacuum chamber and as a pressure tank. Interesting. If you look at the photo – the four clamps are there to hold the lid on when used as a pressure tank. Vacuum chambers are routinely made from heavy PVC pipe couplings and 1/2″ Lexan plastic. Since it would be ‘sucking’ the lid down – I found the idea of using the device for both vacuum and pressure appealing. The plumbing might be a problem .. but I could probably figure it out.

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About etraxx

Retired from the Army in 2006. Served during Vietnam - 1969-1972 as as 72B - Communications Center Specialist (Teletype Operator). Got out .. and went back in 1987 as a 19K - Armor Vehicle Crewman - (M1/M1A1 tanker) getting out in Korea in 1999. Went into the Reserves .. got mobilized in 2001 .. stayed active until my retirement with 20 years in 2006.

Comments

2-1/2 Gal Pressure Tank — 2 Comments

  1. We tried a pressure tank for our casting when we were using resin. It did not do much at all until we got to 45 psi, 55 psi worked better.

    Trouble is that at 55 psi the tank wanted to do a little vibrating dance. I killed the power to the shop on the way out the door. It did not blow, but I did not leave the pressure on very long.

    We found the pressure pot only slowed our production. Without much help. The resin we used did not have a problem with air bubbles as long as I was careful to pick the air bubbles as I cast parts.

    Others in the business swear by the pressure pot. If your trying to make a living with it, its too slow.

    Jerry Kitts

    • Jerry, thanks for the input. I made some resin castings for my On30 critter. They came out .. ‘ok’ .. but I had problems with fine details.

      I if you look at the casting for the bearing block .. the bolt heads on either side didn’t fill completely with resin. I’m hoping that the pressure pot would fix that problem.

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