Modern Hose Coefficients (Episode #68)

In this episode Dennis LeGear explains why modern hose coefficients can be tricky and why it is important to test your own fire attack system. 1.75” hose and 1.88” hose is compared in this scenario revealing different friction loss numbers for two sizes hoses that are both labeled a “1-3/4”. Understanding the implications of this, particularly if your department runs a mixed hose fleet, is critical to achieving your target flow.
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You can tell that the green hose is bigger, because the way it is.