Shut off valve on a live line


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Old 07-15-08, 04:19 PM
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Shut off valve on a live line

I need to install a shut off valve on a live line that currently has no shut off. The line is a 3 in steel pipe that is gravity fed from a spring. There is no way to shut the water off to the line. The valve needs to go in about 20 ft from the end of the line after a 90 degree bend. Any suggestions?
 
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Old 07-15-08, 04:34 PM
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Compressed air is the first thing that comes to mind. That's how they build tunnels under a river.

Suppose you drilled a hole in the pipe on an angle towards the spring, somewhere futher up the line and installed a fitting? Then connect a compressor to it. Don't ask me how much PSI you need because I don't know. Install the valve and disconnect the compressor.
 
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Old 07-15-08, 05:04 PM
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This particular model only is available up to 2", but someone makes a 3". This is how they tap water mains.:http://www.jomar.com/products/pdf/Fi...d-A-Valve2.pdf

Also, the freeze technique is commonly used and very reliable. You do need a large contiunous supply of CO2 for this. http://www.cryolator.com/
 
 

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