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Thread: Pressure pot
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13th January 2021, 05:29 PM #61Senior Member
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So finally today I got to the bits and pieces and put it all together. Talk about taking time. The pressure relief valve kicks in at 45PSI for some reason so will consider replacing this maybe. I found that one of the cast right angles that came with the pot actually has a very small crack which releases a small amount of air.
So now to find where to source measuring cups, release agent, and some HPE to make some molds.
The journey has got underway!
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13th January 2021 05:29 PM # ADSGoogle Adsense Advertisement
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14th January 2021, 05:48 PM #62
What you have is a cheap pot, I'm not sure, but the 80psi may be at what point it goes bang. Be very wary of using high pressures, when the pot goes it is a bomb and shrapnel will go every where, it can kill you easily. There will be a reason it talks about a working pressure of 35psi, probably an additional safety factor to allow for cheap manufacturing. This types of pots also have no seats for the hold downs, and are known to fail from fatigue.
The pressure relief valve setting is associated with the working pressure the pot is made for. 45psi sounds reasonable for a 35psi working pressure. You could take the risk and go for a 50psi working pressure and a 60psi pressure relief valve. You'd need to carefully read the specifications for the pot and decide how much risk you want to take. 50psi is heaps for pens blanks and small items. I only go higher for large bowl blanks etc.
I have an very old cast aluminium pot that I have set up for 50psi woking pressure and 60psi relief valve. Design wise I know it can take higher, but I reduce the pressure I'm working with, to allow some extra safety factor for old age fatigue in the casting (old cast pots like this are known to fail that way). In additional, I tend to cast last thing in the arvo/night and I set up all my pressure pots in the shed and close the door whilst it pressurises. That way before it gets to the maximum pressure and if it's going to go bang I'm well away from it.
Stay safeNeil____________________________________________Every day presents an opportunity to learn something new
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18th January 2021, 11:39 AM #63Senior Member
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Cheers Neil.
Going to get the bits and pieces, I think I'll just see how 40 to 45 PSI goes with this one.
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