Friction Loss Formulas Flashcards

What is the Friction Loss Formula?

What does 'C' represent in the friction loss formula?

What does 'Q' stand for in the context of the friction loss formula?

What does 'L' represent in the friction loss calculations?

What is the standard coefficient for a 1 1/2 inch hose?

How do you calculate 'Q' if GPM is 200?

What is the Friction Loss (FL) for 100' of 2 1/2" hose at 200 GPM?

The friction loss for multiple hose lines of equal size and length can be calculated from just one hose line.

Friction Loss Formula

Friction Loss (FL) is calculated using the formula: FL = C * Q^2 * L.

Coefficient (C)

Represents factors in friction loss, related to hose diameter.
Assigned based on the hose's diameter; smaller diameters yield higher friction loss.
A larger diameter hose decreases the friction loss.

Quantity (Q)

Refers to the flow rate of water, typically measured in gallons per minute (GPM).

Length (L)

Denotes the length of the hose in feet.

Standard Coefficients for Hose Sizes

1" hose: C = 150
1 1/2" hose: C = 24
1 3/4" hose: C = 10
2 1/2" hose: C = 2
3" hose: C = 0.8
4" hose: C = 0.2
4 1/2" hose: C = 0.1
5" hose: C = 0.08

Calculating "Q"

Second step in the friction loss formula involves determining Q.
Example calculations:
- For 200 GPM, Q = 200 / 100 = 2.
- For 400 GPM, Q = 400 / 100 = 4.

Calculating Friction Loss

Example calculation for friction loss over 100 feet of 2 1/2" hose at 200 GPM.
FL calculation: FL = (2 × 2^2) × (1) resulting in FL = (2 × 4) × (1) = FL = 8 PSI.

Multiple Hose Lines - Equal Size and Length

For identical pressure and GPM across multiple hoses, calculate FL for just one hose line.

Explore essential friction loss formulas and concepts with these flashcards. Each card covers key terms such as coefficient, quantity, and length related to friction loss in hoses. Perfect for students and professionals in hydraulics and fluid dynamics.