1. Pick the two known values.
2. Lay a straightedge to intersect the two values.
3. Intersection on the third vertical line gives the value of that factor.
To find the bore size for a Pressure Line consistent with a Flow Rate of 100 litres per minute (26 US or 22 Imperial gallons per minute), and a Flow Velocity of 4,5 metres per second (14.8 feet per second), connect Flow Rate to Flow Velocity and read Hose Bore on centre scale.
The line crosses Hose Bore between -12 and -16 on “All Other Dash Sizes” side of Hose Bore axis, so a -16 hose is required. If RQP5 or T5 Hose is to be used, for this example -16 would also be required.
Based On Formula:
Area (SQ. IN.) = 0.321 x FLOW (G.P.M.)
Area (SQ. IN.) VELOCITY (FT./SEC)