Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Hydraulic gear pump ports and line sizing

  1. Nov 14, 2015 #1
    I am between selecting two gear pumps. One with .25 cu in at 2000 RPM or .38 cu in at 2000 RPM. In order for .25 cu in to get the right flow, I will need to increase the speed to 3000 RPM. Gotta belt drive it either way. I have sized up a suction line of 7/8" I.D. that will get me a velocity of 1.76 ft/sec.

    The inlet port on the .25 pump is a SAE 8 otherwise for a (8/16) 1/2" line. The pump with the .38 has a SAE 10 inlet port other wise (10/16) 5/8" port.

    Because the inlet port size is smaller that the suction line; does running the larger suction line defeat the purpose of sizing the larger line to fit the rule of thumb that a suction line shouldn't go over a velocity of 4ft/sec? It seems like the port size in either pump has defeated itself for the 4ft/sec max velocity for a suction line........

    Interested in members thoughts.

    Thank you!
  2. jcsd
  3. Nov 20, 2015 #2
    Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook