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Power Station...
A POWER GENERATING STATION found a hairline weld crack on a high pressure (2,250 psig) instrumentation line. The valve which would normally isolate this line had a bent stem and could not be fully closed. To shut down the station would be extremely costly. To allow the leak to continue could be hazardous.
SOLUTION: One 3" freeze plug on the high pressure side of the damaged valve permitted proper repairs while the station remained on line. After the valve was repaired and closed, the freeze plug was released and conventional weld repairs were made to the instrumentation line.
Chemical Plant...
A MAJOR MID-ATLANTIC CHEMICAL PLANT had a hot water (230 degree F) circulating pump that was inoperative due to a defective discharge valve. Ordinarily, changing this valve would have required draining the hot, production water system which, in turn, would shut down the entire plant.
SOLUTION: A freeze plug placed between the main hot water line and the defective discharge valve allowed a valve change during the morning shift.
This operation went so smoothly and quickly that the same afternoon, plant management decided to change the old, but operable, suction valve with the PIPE FREEZING technique. All this without disruption of the hot water system.
Hospital...
A LARGE PHILADELPHIA HOSPITAL was required, by the city water department, to change a defective meter on a 10 inch water service line. The valves on either side of the meter would not hold the city water pressure to permit normal meter changing.
SOLUTION: A by-pass line was opened and freeze plugs were placed on each side of the meter beyond the defective valves. Both valves and the meter were changed during the morning with no interruption of the vital hospital water supply nor was any overtime work required.
Find out more about environments, types of fluids and other applications of the Freeze process. Click here for more information.
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