Jump to content
I Forge Iron

hi-lo (two stage) pumps motors


Recommended Posts

Hi all,
I have been looking at hi-lo (two stage) pumps and have become confused of what size motor they require. Do you calculate motor by adding both sides of the pump together or only one side doing the most work? Looking at Batson he is giving lower HP compared to supply houses?
Yours in confusion.

To give you some idea of my dilema, a 8 gpm two stage pump stated as requiring a 5 hp motor to run. By Batson calculations the high pressure side runs at 1.6 gpm @ 3000psi needs 3hp the low pressure runs 4.6 gpm @ 900 psi needs 2.5hp.
Batson has examples of 8gpm needing 3hp while the supply houses state that the larger (16gpm) need 13+ hp to run. I am restricted to using electric and 4KW (5hp)phase conveter.

Link to comment
Share on other sites

Most pump manufactures rate ther 2 stage log spliter type pumps for gasoline horsepower. I think it takes 2.5 gas hp to equal 1 elecric hp.
I have ran my 13 gpm pump with a 5 hp 3400 rpm electric for years with no problems. 2500 psi.

I think you are underpowered....you have verified the psi and gallon flow how?

Link to comment
Share on other sites

There is a lot more that meets the eye when figuring this stuff out.. If you are thinking of using a "log splitter" pump they are designed to run at 4000rpm attached to a gas engine... With a electric motor you can get by with a smaller motor but also understand that because the electric motor runs slower you will be getting less out of the pump.. A better measurement is how many cubic inches (or Cubic Centimeters) per revolution the pump moves... Also go to the manufactures web site and look at the actual spec's listed for you pump. The GPM and PSI listed when they are trying to sell it to you are not very realistic, but they do give the actual numbers on the cut sheets

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...