Buying a Hotbox

Russ Johnson said:
For a heater to use less fuel, it must contain more pipe, increasing the weight. A smaller coil will use more fuel to attain the same heat rating. I sold a couple of custom units a while back. 17 gpm, 10000 psi, schedule 160, 1" coil, 36" across and 5' high without the stand. And, used a 3 gph fuel nozzle.
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Can you give me an idea what a 11 or 13 gpm 3000 psi hot box would run?
 
A lot...


I'll get back to you Monday when I open.
 
The new farley unit I just got has a 1 inch flow switch, I will post pictures in the future, just figured I should mention this. Also I have learned that the burner units on the largo are only capable of 770,000 btu's, so I am not sure how mine got rated for 880,000 btu's. Only way you achieve this from what I understand is by upgrading to a two nozzle firing system, which is $1200 more expensive then the single fire units.
 
Benjamin said:
The new farley unit I just got has a 1 inch flow switch, I will post pictures in the future, just figured I should mention this. Also I have learned that the burner units on the largo are only capable of 770,000 btu's, so I am not sure how mine got rated for 880,000 btu's. Only way you achieve this from what I understand is by upgrading to a two nozzle firing system, which is $1200 more expensive then the single fire units.
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They may be de-rating them to 770k because of regulation. I'm pretty sure you can get a million BTU with one nozzle.
 
Benjamin said:
I bought the largo 880,000 btu burner 120v version and have run the crap out of it for 3.5 years now. My biggest issue I had when I first got it was that it was advertised for 8-12 gpm, but the plate on the side said 8 gpm. Also has a small 8 gpm max flow switch on it which I considered a restriction as well. I did complain to envirospec since I got it from them and they did send out a flow switch that could handle more then 8 gpm technically. I have since redesigned everything from the input of the coil/flow switch area to be able to handle my larger setup.

I have 2 pumps, so I put in 2 flow switches with a 1/2 inch tee to tie them together with one way flow switches on both inputs as well.

Only had to replace 2 thermostats and redid the fuel filter setup to handle racor filters.
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What diameter pipe is the coil?
 
Diameter of the tube in my largo is 1/2 inch, farley 3/4. Farley says I can only do 3000 psi with the 3/4 inch, I am pretty sure I can do more psi with the largo, but i honestly never go to or above 3000 psi. Do very little concrete, and if I do, I have 10 gpm pumps that will provide lots of volume pushing power. I did do some 2 wand steaming today off the largo, had both wands above boiling, 3 and 4 size nozzles in the wands, 1700 psi was the pressure. She drank diesel though, 3 hours approx for 10g of diesel good thing for the 80g side tank of marked diesel.

12v
http://www.beckettcorp.com/product2/productdetail.asp?detailid=38
245,000 to 770,000 BTU/hr input

120v
http://www.beckettcorp.com/product2/productdetail.asp?detailid=39
Input(SF):175,000 to 770,000 BTU/hr

I am assuming this is the flow switch, although I should look inside to confirm its not a pressure switch. I still have to get around to bolting the engine/burner down, just haven't had time.
IMG-20140604-00802.jpg

Quick connects are 1/2 inch
 
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