Hose Size Selection - Flow Capacities at Recommended Flow Velocities

The nomogram below can be used to determine the hose I.D. (or dash size) that you will need. Use a straight edge to connect the flow rate that your system requires with the recommended velocity range for your application. The intersection of these two points is the required hose size. (If the line intersects between two sizes, use the next largest I.D.)

Example: In the left hand column, locate "16 gallons per minute"; in the right hand column, find "20 feet per second," which is the maximum recommended velocity range for pressure lines. A straight edge between these two points will intersect in the center column, giving you the required hose I.D. - in this case, you would need an inner diameter that is 0.625 (5/8") inch or larger.

If we have not answered your questions here, e-mail us at hfe@hfeweb.com or call us at 888.715.4673.

You may also wish to review our page on how to select the correct hose for your application.

For more information, please see Parker Safety Guide 4400-B.1 for selecting and using hose, tubing, fittings and related accessories.