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
Therein lies the rub ... what are the specs and flow rates and pressures required for say a 99% assurance that it is done properly. Probably you are safe if you have one of these 10gal 5HP $1,000 compressor systems, but for the average Joe the $5 jug of RV antifreeze and no extra equip needed might be the most cost effeftive.
Larry