Parker Hannifin Corporation
| Parflex
®
Division | Ravenna, Ohio |
For detailed ordering information, please consult price list or contact Parflex
®
Division.
G-4
The Fluid Velocity Nomogram gives the velocity
of a liquid as a function of flow rate and inside
diameter of the fluid line. The commonly
recommended maximum velocities for hydraulic
oil systems at 200°F or less are indicated for
guidance.
Example: At 10 gpm, what is the minimum size
within the recommended velocity range for a
hydraulic pressure line?
The dashed line drawn from the 10 gpm mark on
the left hand line to the maximum velocity of 20
fps intersects the middle line at .438" (7/16" I. D.
hose or tubing). For a hose application, use
1/2"
I. D., the nearest common standard size.
Selection of Hose Diameter
From Flow Rate and Velocity
FLUID VELOCITY NOMOGRAM
The cu. ft. per min. value is the actual volume
flow rate under flowing conditions. For air, stan-
dard cfm of free air = 7.81 actual cfm when the
inlet air is at 100 PSIg, 68°F.
cu. ft./min. = .1337 Q
v
fps
= .321Q
Q = gal per min
d = hose or tube I. D. (inch)
þd
2
4
This chart is based on the following formulas: