First here's what I'm thinking, then the questions.
6Kproducts.com sells hydraulic saw set ups for processing firewood. They have several hydraulic motor sizes: 11 gpm, 14, 17, and 30 gpm.
Using a "rule of thumb" formula of GPM x PSI x .0007 = required horse power.
Now the questions start...based on engine and motor comparison. In my case electric motors are not an option.
Question: How do these three power units compare: gas, diesel, and electric? I seem to remember electric hp ratings being very different, much lower in comparison, to other fuels.
Even gas/diesel hp is not a even comparison, but I don't know how to compare them regarding hp. Other than that, HP seems a rather ambiguous, almost useless, number.
Also, when checking a Surplus Center catalog, pumps other than two stage pumps seem to be listed primarily in cu. in. capacity more often than GPM. Womack's (on-line, under Hydraulic Pump Calculations), formula for Pump Displacement Needed for GPM of Output Flow: 231 x GPM / RPM = cubic inches per revolution.
So how do I use this?
For example: Using the 17 gpm cut-off saw.
Cu. In. pump size? and HP needed to run that size pump?
Pump size depends on RPM, therefor type of engine. 3,600 rpm for gas; 1,800 rpm for diesel.
HP needed... 17gpm x 2,500psi x .0007 = 29.75 hp (really?)
17gpm x 3,000psi x .0007 = 35.70 hp
Okay so getting more realistic and affordable.
HP needed... 11gpm x 3,000psi x .0007 = 23.10 hp
23 hp gas, diesel or electric?
6Kproducts.com sells hydraulic saw set ups for processing firewood. They have several hydraulic motor sizes: 11 gpm, 14, 17, and 30 gpm.
Using a "rule of thumb" formula of GPM x PSI x .0007 = required horse power.
Now the questions start...based on engine and motor comparison. In my case electric motors are not an option.
Question: How do these three power units compare: gas, diesel, and electric? I seem to remember electric hp ratings being very different, much lower in comparison, to other fuels.
Even gas/diesel hp is not a even comparison, but I don't know how to compare them regarding hp. Other than that, HP seems a rather ambiguous, almost useless, number.
Also, when checking a Surplus Center catalog, pumps other than two stage pumps seem to be listed primarily in cu. in. capacity more often than GPM. Womack's (on-line, under Hydraulic Pump Calculations), formula for Pump Displacement Needed for GPM of Output Flow: 231 x GPM / RPM = cubic inches per revolution.
So how do I use this?
For example: Using the 17 gpm cut-off saw.
Cu. In. pump size? and HP needed to run that size pump?
Pump size depends on RPM, therefor type of engine. 3,600 rpm for gas; 1,800 rpm for diesel.
HP needed... 17gpm x 2,500psi x .0007 = 29.75 hp (really?)
17gpm x 3,000psi x .0007 = 35.70 hp
Okay so getting more realistic and affordable.
HP needed... 11gpm x 3,000psi x .0007 = 23.10 hp
23 hp gas, diesel or electric?