Sizing of aircraft fuel pump

[P99L]

Hi, i'm currently having problem in sizing of a aircraft fuel pump. The fuel consumption of the aircraft is (18gal/hr). What size of tube should be use 1/2 inch or 3/8 inch inorder to meet the requirement. Please advice.

Thankyou.

 

[fredb]

Hi,

For pressurized fuel systems, flow reynolds numbers must remain below 5000 and velocities under 1.35 fps.

Fuel pressure losses in round tubing at low vapor-liquid ratios may be computed by the following relationship:

delta P = 3.417 x 10(-5) x u(0.25)l P(0.75)v(1.75)/d(1.25)

all X (1-V/L)

Where: u = viscosity, English units (centipoise x 0.000672)
l = Length of pipe, ft.
p = Density of fluid (lbs/cu ft)
v = Mean velocity of fluid, fps
d = Inside diameter of pipe, ft.
V/L = Vapor liquid ratio, dimensionless
delta P = Pressure drop, psi

Note: Numbers in parenthesis are powers i.e. 10(-5) = ten to the minus five power.

 

[fredb]

Hello again,

I forgot to preface my remarks to indicate that the reynolds number and velocity are recommended design practice for general aviation piston aircraft fuel systems.

 

[P99L]

Thanks mate, have a good one.