โMay-05-2014 07:41 AM
โMay-21-2014 11:36 AM
โMay-20-2014 10:33 PM
โMay-11-2014 03:35 PM
westend wrote:Harvey51 wrote:The issue with trying to just drain the system is that water can be trapped in a bell of a pipe. I would do as ThomasNH recommends. If you let all the water drain, go back and blow one supply line at a time so that there is sufficient air pressure to move the remaining water out of that supply pipe. I've read about some RV'ers using vodka in place of RV antifreeze. I think I'll try that, next year.
I don't know how to blow the water out. Do you blow into each sink, toilet to push the water out the low point drain? Or into the city water inlet to blow it out the sinks? What prevents water from lying in the lower half of a pipe while the air goes by in the top half?
If RV plumbing has a true low point drain, we should be able to open it and all the taps on the way home and have all the water fall out as we drive.
โMay-11-2014 03:29 PM
Jloucks wrote:
I have always blown out my lines. 8 years of no problems. Recently tho, when dewinterizing, until my toilet is good and primed (run a lot of water thru) it leaks. I suspect this is due to the valve system somehow losing it's water seal/prime.
Anybody else experience this?
On edit: Pink stuff into the traps. ...so I do have a jug on hand.
โMay-07-2014 10:04 PM
โMay-07-2014 04:15 AM
Bumpyroad wrote:CloudDriver wrote:Bumpyroad wrote:Harvey51 wrote:
What prevents water from lying in the lower half of a pipe while the air goes by in the top half? .
nothing
bumpy
High velocity air flow is what is needed to clear water from the horizontal (and vertical) sections of piping. A low velocity/low flow rate of air will clear some of the water, then just flow on by in the top half of the pipe. A high velocity/high flow rate will move more water along due to friction with the water surface and will break the water into droplets that can be carried vertically up to a sink faucet, etc. Obtaining the highest possible air flow through a piping section is the reason for blowing only one faucet at a time.
Successfully blowing out a piping system requires an air compressor capable of providing the necessary high volume of air continuously for a long enough time to get all the water out. Folks who report success in blowing lines must be owners of an adequate air compressor.
would you care to explain exactly what the requirements for this would be?
bumpy
โMay-07-2014 03:42 AM
โMay-06-2014 05:54 PM
โMay-06-2014 01:52 PM
Harvey51 wrote:The issue with trying to just drain the system is that water can be trapped in a bell of a pipe. I would do as ThomasNH recommends. If you let all the water drain, go back and blow one supply line at a time so that there is sufficient air pressure to move the remaining water out of that supply pipe. I've read about some RV'ers using vodka in place of RV antifreeze. I think I'll try that, next year.
I don't know how to blow the water out. Do you blow into each sink, toilet to push the water out the low point drain? Or into the city water inlet to blow it out the sinks? What prevents water from lying in the lower half of a pipe while the air goes by in the top half?
If RV plumbing has a true low point drain, we should be able to open it and all the taps on the way home and have all the water fall out as we drive.
โMay-06-2014 12:17 PM
โMay-06-2014 12:08 PM
โMay-06-2014 11:48 AM
CloudDriver wrote:Bumpyroad wrote:Harvey51 wrote:
What prevents water from lying in the lower half of a pipe while the air goes by in the top half? .
nothing
bumpy
High velocity air flow is what is needed to clear water from the horizontal (and vertical) sections of piping. A low velocity/low flow rate of air will clear some of the water, then just flow on by in the top half of the pipe. A high velocity/high flow rate will move more water along due to friction with the water surface and will break the water into droplets that can be carried vertically up to a sink faucet, etc. Obtaining the highest possible air flow through a piping section is the reason for blowing only one faucet at a time.
Successfully blowing out a piping system requires an air compressor capable of providing the necessary high volume of air continuously for a long enough time to get all the water out. Folks who report success in blowing lines must be owners of an adequate air compressor.
โMay-06-2014 10:05 AM
Bumpyroad wrote:Harvey51 wrote:
What prevents water from lying in the lower half of a pipe while the air goes by in the top half? .
nothing
bumpy
โMay-06-2014 09:48 AM