Pressure Loss in Water Pipe Calculator

Hazen-Williams Formula:

\[ \Delta P = \frac{4.52 \times Q^{1.85} \times L}{C^{1.85} \times D^{4.87}} \]

Flow Rate (Q):

gpm

Pipe Length (L):

Hazen-Williams Coefficient (C):

Pipe Diameter (D):

Pressure Loss (ΔP): psi

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1. What is Pressure Loss in Water Pipes?

Definition: This calculator estimates the pressure drop in water pipes using the Hazen-Williams equation.

Purpose: It helps engineers and plumbers determine the pressure loss in water distribution systems.

2. How Does the Calculator Work?

The calculator uses the Hazen-Williams formula:

\[ \Delta P = \frac{4.52 \times Q^{1.85} \times L}{C^{1.85} \times D^{4.87}} \]

Where:

\( \Delta P \) — Pressure loss (psi)
\( Q \) — Flow rate (gallons per minute)
\( L \) — Pipe length (feet)
\( C \) — Hazen-Williams roughness coefficient
\( D \) — Pipe diameter (inches)

Explanation: The formula calculates frictional head loss in water pipes based on flow characteristics and pipe dimensions.

3. Importance of Pressure Loss Calculation

Details: Proper pressure loss estimation ensures adequate water pressure throughout the system and helps in pump selection.

4. Using the Calculator

Tips: Enter the flow rate (gpm), pipe length (ft), Hazen-Williams coefficient (default 140 for new steel pipe), and pipe diameter (in). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What are typical C values?
A: Common values: 140 for new steel pipe, 130 for cast iron, 150 for PVC.

Q2: What's the range of this formula?
A: Best for water at 60°F in pipes 2-24 inches diameter with turbulent flow.

Q3: How does pipe material affect results?
A: Rougher materials have lower C values, resulting in higher pressure loss.

Q4: Can I use this for other liquids?
A: No, the Hazen-Williams equation is specifically for water.

Q5: How accurate is this calculation?
A: It provides good estimates for engineering purposes but actual conditions may vary.