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Old 03-15-2011, 10:08 AM   #16
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Cutting A Fire Hydrant Down To Size


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Originally Posted by WillK View Post
Plasma cutter would be better than torch...
Better how?

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Old 03-15-2011, 10:48 PM   #17
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Cutting A Fire Hydrant Down To Size


I'll second the gas cutoff saw idea.



Just need a metal cutting wheel and you'll be through in no time.
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Old 03-15-2011, 11:22 PM   #18
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Cutting A Fire Hydrant Down To Size


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Originally Posted by burnt03 View Post
I'll second the gas cutoff saw idea.



Just need a metal cutting wheel and you'll be through in no time.
That is all we use,how ever you have the wrong blade,you need a Bi-metal blade
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Old 03-16-2011, 08:15 AM   #19
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Cutting A Fire Hydrant Down To Size


Quote:
Originally Posted by Pistol Pete View Post
Quote:
Originally Posted by WillK
Plasma cutter would be better than torch...
Better how?
Ayuh,... I'm not sure about a plasma cutter, 'n cast iron,...
But,...
I Do know that Ox/ Ac Torches will NOT cut cast iron....
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Old 03-16-2011, 09:15 AM   #20
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Cutting A Fire Hydrant Down To Size


With an oxy/acetylene torch, and I'm not sure I've used it for cast iron but I've done 1" steel and bolts, you heat the metal to its melting point, then you squeeze the handle and it pretty much is blowing oxygen. It doesn't work for stainless steel or aluminum, but that's just a side note. The edge that is left behind is metal that melted and then cooled without falling away, so while you're not going to be concerned with the changes to the structural integrity of the metal in this case, the cut wouldn't tend to be as clean as a plasma cutter (or the various saw options).

The plasma cutter is pretty likely something that a welding shop is going to have and like I said, it will make a cleaner cut.

If you were to need to get equipment, you'd probably get a cutting torch set and tanks cheaper than a plasma cutter.

The images below show metal cut with a torch (the image with the black background) and a cast iron piece cut with a plasma cutter (the L shaped piece) from images I found searching the internet.
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Cutting A Fire Hydrant Down To Size-cutted_metal-torch.jpg  
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Old 03-17-2011, 10:51 PM   #21
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Cutting A Fire Hydrant Down To Size


Just use a zip cut disc on an angle grinder, it will cut through any metal quickly and the discs are reasonably priced.
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Old 03-21-2011, 02:57 AM   #22
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Cutting A Fire Hydrant Down To Size


I would agree with the ZipCut. They cut through almost anything. Wear gloves and safety glasses or face-shield. Plasmas do not like to cut through cast. Not sure if the hydrant is case steel or cast iron. Most likely cast steel as they need to be threaded for the hose couplings.

The gas cut off saws are good for some uses but they tend to kick back. I personally would not recommend the gas saw unless you can clamp that sucker down well.
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Old 03-21-2011, 05:01 PM   #23
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Cutting A Fire Hydrant Down To Size


I not sure how most of them are but I have seen ones that have brass threaded fittings for the hoses to connect. I am thinking because steel threads would get pitted and rusty making it hard to screw the hose on. I know this is not at all related to cutting the hydrant but I thought I would mention it.

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