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Name: Bob
Status: other
Grade: 12+
Location: IL
Country: USA
Date: Fall 2012


Question:
There is a discussion on whether the length of a hose has any impact on the pressure of static water within the hose. Is the pressure of the water at the pump going to be the same as the pressure of the water at the end of the hose if the water is not flowing, but only pressurized to 300psi. We were told to limit the length of the hose to 300', but one individual considered that it shouldn't matter how long the hose is, the pressure will be the same. Will factors like elasticity of the hose when pressurized or friction within the hose as the line is being pressurized have any influence on the pressure at the beginning and the end of the hose?



Replies:
It will not matter if the water is static. When the water is flowing, the pressure will drop along the length.

That is, as long as all parts of the hose are at the same height. Otherwise the static pressure will be greatest in the lowest portions of the hose.

Richard E. Barrans Jr., Ph.D., M.Ed. Department of Physics and Astronomy University of Wyoming



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