Selecting the correct hose size for water jetting applications can be a challenge. Parker provides a hose size selection nomograph which can aid in selecting the correct hose based on flow capacities at recommended velocities.
The chart features a left-hand column that displays the flow capacities in gallons per minute (gal/min) and a right-hand column that shows the recommended velocity range for pressure lines in feet per second (fps). To determine the appropriate hose size for a particular flow rate, locate the value in the left-hand column and the corresponding velocity range in the right-hand column.
In the example shown in the table we need to determine the proper hose size for a flow rate of 10gal/min. We can locate 10 gal/min in the left-hand column and 25 fps (the maximum recommended velocity range for pressure lines) in the right-hand column. Then we draw a straight line connecting these two points.
Next, we need to check the inside diameter shown in the centre column. In our example, the inside diameter shown is above -6, which means we need to use a hose size of -8 (1/2”).
It’s worth noting that the same procedure can be followed for suction hoses, except that we need to use the recommended velocity range for intake lines in the right-hand column instead of the one for pressure lines.
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