Sorry for the double post!!! Please ignore this one.
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?
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?
