The Craftmans Shop > New from Old
Resurrection of a CFEI 100 KVA Induction Furnace
awemawson:
Interesting - the metal tube bits of my torch have the hose barb grooves directly into them so no screwed fitting as such - just push on and crimp. Out of the DS130 the gas is 1/2" BSP male cone and the air is 5/8" BSP male cone. (Don't often see 5/8" BSP and this one is an adaptor down from a 3/4" lever ball valve)
There doesn't seem to be a jet as such on my torch - the burner end is a wiggly steel shape that unscrews and apart from the inbuilt taper control knob that does air and gas in separate sections there seems to be no restriction other than the size of the tubes that the torch is made from.
hermetic:
NAH MATE! my imagination, you can't get the gas and air pipes swapped over, they would fit, but then there would be no gas at the pilot! obvious if you have half a brain! My hoses are the same size, and have threaded couplings onto the torch, and it has also just been rebuilt by Flamefast, who recomended the 37mbar reg, but made no mention of throughput of gas as I can remember, I will check tomorrow and take pics if I get chance, but tomorrow is Holbrook bed collection day, so it will be fraught! Wish me luck!
Phil
awemawson:
At last I've heard back from Flamefast - apparently 3 mm is the jet size for propane - the one currently fitted is the one I made at 3.5 mm so I'll make another in due course.
(Note: The torch is rated at much the same output as the forge so I used it for the following tests)
I've managed to get my hands on a suitable manometer to cover the propane (37 mBar) pressure range so can do some proper diagnosis on the issues. Setting my (probably low flow rate but adjustable) regulator to 37 mBar with no gas flow and then setting the torch burning rapidly demonstrated the problem. The gas pressure dropped dramatically to barely 1 mBar (though the torch burnt well!)
Re-adjusting the regulator so that the pressure returned to 37 mBar gave a huge flame and insufficient air for the amount of gas, so luminous, however throttling the gas down with the lever ball valve on the manifold I could restore the flame to a very acceptable shape and colour.
Of course turning off the torch increased the gas pressure well above 37 mBar (blowing my red - dyed water out of the manometer !)
So I definitely need to increase the feed pipe bore and get the high flow regulator fitted. The feed from regulator to the forge is currently 8 mm and I have 13 mm on order with associated fittings to allow the high flow rate regulator to be used.
awemawson:
The hose and fittings have arrived to fit the new 'High Flow' regulator and a fatter feed pipe from the regulator to the forge -13 mm as opposed to 8 mm -
This represents a large increase in delivery area - 50 mm increased to 133 mm
As expected the propane pressure now stands up better to the flow of the torch and the forge, but still dropping to about 30 mBar.
However I notice that there is obviously a leak between the perforated ceramic tile that is the actual burner and the pan or plenum chamber below it as gas / air mix is leaking out below and igniting at the side of the quadrant tiles - this is bad news as it means digging the pre-formed tiles out of their bedding cement to see what is going on.
This ceramic chip forge is being a bit of a pain (to say the least) taking far too long as it is really a diversion off the 'main event' which is the Induction Furnace, however I don't feel that I can leave it as it is and must bite the bullet and fix it.
Muzzerboy:
FWIW, there's "25KG 1400DC Dense Castable Refractory Furnace Kiln Forge Lining" on homeworkshop.org.uk at the moment. No idea if that's even remotely applicable, or pricing or anything but thought I'd mention if you haven't seen it.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version