Power Cube/Research Development: Difference between revisions

Revision as of 17:59, 8 August 2011

This page concerns issues encountered in the Research and development of the various OSE projects.

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 [[ Hydraulic Hose Sizing ]]
-== 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 = Q / (3.117 * pi/4 * D ^ 2)
-Where:
-:V is fluid velocity in ft/sec
-:Q is fluid volume in gallons/min
-:D is hose inside diameter in inches
-or
-:D = (Q / (3.117 * pi/4 * V) ) ^ 1/2
-In this case, V = 5 ft / sec and the flow rate is 13 GPM, so:
-:D = (13 GPM / (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, I double-checked and found the formula indicates that the supply and return hoses should be larger as well:
-:D = (13 GPM / (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
-Both Pressure and Return hose sizes should be increased to 3/4", as well as all couplers and fittings.