Hose Friction loss problems Flashcards
What is hose friction loss?
The loss of pressure that occurs due to the resistance of water flowing through a hose.
True or False: Hose friction loss increases with longer hose lengths.
True
Fill in the blank: Hose friction loss is typically measured in _______.
pounds per square inch (psi)
What factors affect hose friction loss?
Hose diameter, length, flow rate, and type of fluid.
Multiple Choice: Which of the following will decrease hose friction loss?
Increasing the diameter of the hose
What is the formula for calculating friction loss in hoses?
Friction loss (FL) = C × (Q²) × (L) / (D²), where C is a coefficient, Q is flow rate, L is length, and D is diameter.
True or False: A larger diameter hose will always result in less friction loss.
True
Fill in the blank: The coefficient ‘C’ in the friction loss formula depends on the _______.
hose material and type
What does the term ‘flow rate’ refer to in the context of hose friction loss?
The volume of fluid that passes through the hose per unit of time.
Multiple Choice: What unit is typically used to measure flow rate?
Gallons per minute (GPM)
True or False: Friction loss is linear with respect to flow rate.
False
What is the impact of bends and fittings on hose friction loss?
Bends and fittings increase friction loss due to turbulence.
Fill in the blank: To minimize hose friction loss, it is important to maintain a _______ flow.
laminar
What is the relationship between flow rate and friction loss?
Friction loss increases with the square of the flow rate.
Multiple Choice: Which hose type typically has the lowest friction loss?
Smooth-bore hoses
True or False: Friction loss can be neglected in very short hoses.
True
What is the purpose of calculating hose friction loss?
To ensure adequate pressure is maintained at the nozzle for effective operation.
Fill in the blank: Hose friction loss can be calculated using a _______ chart.
friction loss
What does the term ‘velocity’ refer to in the context of fluid flow in hoses?
The speed at which fluid moves through the hose.
Multiple Choice: Which factor does NOT influence hose friction loss?
Temperature of the fluid
True or False: Reducing the length of the hose will always decrease friction loss.
True
What is the effect of temperature on fluid viscosity?
Higher temperatures generally decrease fluid viscosity, which can reduce friction loss.
Fill in the blank: Hose friction loss is crucial for _______ management in firefighting.
water
Multiple Choice: Which is a common method to calculate friction loss in a fire hose?
Using a friction loss formula or chart
