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Taro
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what is the static pressure rise per vertical foot in a ...
Customer Question
what is the static pressure rise per vertical foot in a vertical cylinder, pipe or column
Submitted:
6 years ago.
Category:
Homework
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Expert:
Taro
replied 6 years ago.
Hi Kerry.
Let's say you have a cylinder vertically placed, and some fluid like water filling inside. To make it easier to visualize the situation, please look at the little figure at the upper right corner of the following web page (I hope the URL shows up in one line):
http://www.ac.wwu.edu/~vawter/PhysicsNet/Topics/Pressure/HydroStatic.html
If you measure pressures due to the water at different depths (i.e., the depth, denoted h here, is the distance from the upper surface of the water) the following relationship applies:
P = ρ g h
where P is the pressure at depth h of the water, ρ the density of the water, and g is the gravitational acceleration constant. From this relation, you can see quntitatively that the pressure increases at greater depths (i.e., h is larger) within the cylinder.
In short, at greater depths within the water, there is more water above the level at height h which causes a greater downward pressure at depth h, due to gravity pulling the water down.
So "the static pressure rise per vertical foot" means exactly how much the pressure increases if you go one foot deeper in the depth h within the cylinder. I don't think I can say more than that given the problem statement.
Hope this helps!
Cheers!
Taro
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Customer:
replied 6 years ago.
The above answer gives a formula with incomplete
explanations of the formula in order to computate and use it.
eg.What is the density of water (in numerals),and what is the gravitational acceleration constant
as it applies to water (in numerals)? What units are "P" in, (psi)? Otherwise there is no way to work the formula. I only need a practical formula for use in piping estimation.
eg.A simple answer that would give me the information that I am looking for at this point, would be,"In a 'practical situation', the water pressure (psi) in a vertical pipe in a static state will increase by what psi per vertical foot of water column rise". This woud be at atmospheric pressure and measured at the bottom of the water column.
Expert:
Taro
replied 6 years ago.
Kerry  Okay, thank you for the clarifications.
I will assume a practical situation, in which the density of water is estimated to be
ρ = 1000 kg / m
^{3}
= 62.43 lbm / ft
^{3}
.
(I used the values listed http://hypertextbook.com/facts/2007/AllenMa.shtml). The gravitational acceleration constant is
g = 9.8 m / s
^{2}
= 32.2 ft / s
^{2}
.
(http://en.wikipedia.org/wiki/Gravity).
We are interested in how much the pressure P changes if depth h is increased by 1 ft. Let's call the change in pressure between depths h
_{1}
and h
_{2}
in pressure ΔP = P
_{1}
 P
_{2}
. Writing out, we have
ΔP = P
_{1}
 P
_{2}
= ρ g h
_{1}
 ρ g h
_{2}
= ρ g (h
_{1 }
 h
_{2}
) = ρ g Δh ,
where Δh = (h
_{1 }
 h
_{2}
) = 1 ft, since we want the two depths to differ by 1 ft.
Then the rest is plugging in numbers. We try using both British and SI units (just for checking). Our goal is to express the pressure in units of psi for the final answer.
ΔP = ρ g Δh = (62.43 lbm / ft
^{3}
) (32.2 ft / s
^{2}
) (1 ft) = 2010 lbm / ft / s
^{2}
,
Since 1 psi = 1 lbf / in
^{2}
, we need to use the conversions
1 lbf = (1 lbm) g = (1 lbm) (32.2 ft / s
^{2}
) = 32.2 lbm ft / s
^{2}
and 1 ft = 12 in. Then stepbystep we have
ΔP = 2010 lbm / ft / s
^{2}
= (2010 lbm / ft / s
^{2}
) (1 lbf / (32.2 lbm ft / s
^{2}
) )
ΔP = 62.42 lbf / ft
^{2}
= (62.42 lbf / ft
^{2}
) (1 ft / 12 in)
^{2}
= 0.433 lbf / in
^{2}
.
Hence ΔP = 0.4335 psi.
In SI units instead, 1 ft = 0.3048 m, and we have
ΔP = ρ g Δh = (1000 kg / m
^{3}
) (9.8 m / s
^{2}
) (0.3048 m) = 2987 kg / m / s
^{2}
= 2987 Pa,
where Pa is Pascal and the conversion factor is 1 psi = 6894.8 Pa (http://www.csgnetwork.com/pressconvt2table.html). So in psi, we have again
ΔP = 2987 Pa = (2987 Pa) (1 psi / (6894.8 Pa) ) = 0.433 psi.
So that's my answer  the pressure increases by 0.433 psi if the vertical depth changes by 1 ft.
Note: I see that you might be expecting a shorter solution via a formua which might exist specifically for piping estimation of which I may not be aware personally  if you are not satisfied with my answer, you could wait for an answer from an expert in piping estimation, if s/he exists in the forum. Nonetheless, I belive the numerical answer should be the same. (It is sometimes hard to discern what kind of math is being assumed for this type of question; I'm sorry if I'm misunderstanding you.)
Cheers,
Taro
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Customer:
replied 6 years ago.
Thanks for the clarification. That was just the info. that I needed.
This was my first shot at using JustAnswer. I probably need to add a little more "clarity" to my questions in the future.
Kerry
Expert:
Taro
replied 6 years ago.
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