Recent content by grandnat_6

It is for measuring the static pressure and turning it into feet. It's something I wanted to know how to do to make sure I have a large enough suction line and to make sure a suction filter will work. I did not know the number published was for turbulent flow. I found out by using this formula...

http://www.mcnallyinstitute.com/11-html/11-12.html Static head. Measure it from the centerline of the pump suction to the top of the liquid level. If the level is below the centerline of the pump it will be a negative or minus number. Surface pressure head. Convert the gage absolute pressure...

I did a lot of studying this weekend on NPSHa and NPSHr. I have a few more questions. A publication I found talked about gauge pressure for surface pressure head. Is this the pressure or vacuum on the surface of the fluid on the tank? Or is it an actual suction pressure reading from the...

SteamKing, Thank you for the information and links, my fluid power book doesn't talk about NPSHa. I'll search and study more on it.

Hi, I'm trying to size up a suction line, for a positive displacement gear pump. I'm flowing 3.4 GPM. The oil I'm looking at using is Case IH Hy-tran. It has a SUS # of 208 at 100 degrees F and 47 at 210 degrees F. cSt of 40 at 40 degrees C and 6.3 at 100 degrees C. I have sized up a 7/8"...

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 into 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...

When I get down to purchasing I will ask them about eccentric loads at that time. Thank you.

Saying parallel would have been a better choice of words for my writing. It would use a positive displacement pump. I did think of the situation JBA described. Would a pressure compensating proportioning flow divider to solve this issue? Thanks again, you both are very helpful.

Hi, I've been reading up on hydraulic fluid power design to design a lifting system for a loader bucket I'm building for my 20Hp tractor. I know how to calculate the force/ speed of one cylinder extending; but I am a little lost as far as using two cylinders. If I have a total weight of 2000...

Hi, I'm trying to find the belt pull on a mower deck. The deck consist of 3 spindles and a spring loaded back idler with one v-belt. The engine driving the spindles is a 20 HP twin cylinder engine operating at 3600RPM. Main drive spindle is 3600 rpm (1:1 ratio) Engine manual says max...

Thanks for the help! I understand now.

Hi, I think I confused myself. Must be working too hard or something. I trying to find the percentage gain or loss of an investment. example: 1. orginal investment $10000.00 today $9,500.00 9,500.00/10,000.00 = .95*100 = 95% Therefore I have 95% of my orginal amount or...

Hi, I've been working on a tubular sub frame, that I want to attach to a main frame. The attached shows the sub frame in black lines. The main fram is in purple. There are only four connection points and a force pushing down on each side. When I check for the reaction forces and make...

attached are the traverse loading deflections.

Sorry, The shear/moment diagram is as long as the horizontal distace from Pin E to Pin B. 57.8547". I'll work on the y' and y. later this weekend. Thanks.