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+11

Why Does It Always Have to be Done That Way?

Paul Shapiro

Myth #12

Myth 12: A low pressure nozzle used on a handline can create kinks in the hose due to the subsequent low engine pressure, which will critically restrict the flow.

Reality: Seeing is believing. Set up a series of flow tests to see what really happens. These flow tests should be conducted using a flow meter. Use your standard interior attack lines in conjunction with low pressure nozzles. Let’s use a 15/16” tip flowing 185 GPM at 50 pounds nozzle pressure. After reaching the flow, have one or two people place a rather severe kink in the line and then take another reading. You will find that the flow wasn’t restricted that much at all. I have conducted tests with this same scenario losing only about 20 GPM. Next, use the same 15/16” nozzle, but only flow 100 GPM and place the kink in the line again. The same thing should happen, not much change in the flow.

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