Pulling a vacuum to remove water

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24,603
Location
Upstate NY
Thread starter
Back to my clogged hot water pressure washer. The inlet and outlet of the coil are at the top of the coil. So it can hold a few gallons of water. Let's say it's clogged in the middle, would pulling a vacuum on one end remove all the water up to the clog. Going to be adding a chemical and do not want it to get diluted with water I assume is in there.
 
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129
Location
AR
If you pull enough vacuum you could boil the water out. I'm not sure how you would hook-up a proper vacuum pump. [Linked Image]
 
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4,821
Location
Columbus,Nebraska
If one inlet is clogged, pulling a vacuum on the other end won't produce a differential pressure needed to remove fluid. A fluid extractor with a long flexible tube might remove the fluid.
 
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386
Location
Peace valley, Missouri
Refrigeration vacuum pumps are.not made for pulling that amount of water out of a system without a cold trap between pump and system. Cold trap is a tank that is set in dry ice to freeze the vapor before it gets to the pump. Tried either a shop vac or air compressor with their nozzle blowing or drawing air across the ends of the pipes suction in the tube.
 
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933
Location
Arizona
I used to service those High temp pressure washers in a previous life. Most clogs were result of lime/mineral build up where steam is flashed. At this point the coil was replaced as cleaning minerals from the middle of a 50ft coils is difficult. And the caustic cleaner will eat away at the aluminum and not good with high pressure steam. for DIY fix I would remove the coil in a safe place outside drain it and fill the inlet with Lime-Away then pressurize the inlet with compressed air and see if it can eat the clog enough to flush it. put a hose on the outlet to safely drain the caustic if it lets go.
 
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