Power Cube/Research Development
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Hydraulic Hose Sizing
The size of the suction hose for the power cube, it is calculated from the fluid velocity in the hose. The general values used are:
- Pressure: 20 ft/sec
- Return: 15 ft/sec
- Suction: 5 ft/sec
The formula for calculating the hose size is as follows:
- V ft/sec = GPM / (3.117 * pi/4 * d ^ 2)
or
- d = (GPM / (3.117 * pi/4 * V ft/sec) ) ^ 1/2
In this case, V = 5 ft / sec and the flow rate is 13 GPM, so:
- d = (13 / (3.117 * pi/4 * 5 ft/sec) ) ^ 1/2 = 1.03 in
The sizing guidelines say to always round up - meaning take the next size larger than 1.03 inches (probably 1 1/4").
While I thought the sizing for the pressure lines was OK, doublechecking, the formula indicates that the hose should be greater than 1/2":
- d = (13 / (3.117 * pi/4 * 20 ft/sec) ) ^ 1/2 = 0.515 in
Also, the return lines appear to be undersized as well:
- d = (13 / (3.117 * pi/4 * 15 ft/sec) ) ^ 1/2 = 0.595 in