1. What is a Pressure Drop Through Hose Calculator?

Definition: This calculator estimates the pressure loss (ΔP) when fluid flows through a hose or pipe, based on flow rate, cross-sectional area, and fluid density.

Purpose: It helps engineers and technicians determine the pressure loss in fluid systems to ensure proper system design and operation.

2. How Does the Calculator Work?

The calculator uses these formulas:

Where:

• \( \Delta P \) — Pressure drop (psi)
• \( V \) — Fluid velocity (ft/s)
• \( \rho \) — Fluid density (lb/ft³)
• \( Q \) — Flow rate (GPM)
• \( A \) — Cross-sectional area (ft²)

Explanation: First calculates velocity from flow rate and area, then computes pressure drop based on velocity and fluid density.

3. Importance of Pressure Drop Calculation

Details: Proper pressure drop estimation ensures adequate pump sizing, proper system performance, and avoids flow restrictions in fluid systems.

4. Using the Calculator

Tips: Enter the flow rate in GPM, cross-sectional area in ft² (for circular hoses: A = π × (diameter/2)²), and fluid density (default 62.4 lb/ft³ for water). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the 448.83 conversion factor?
A: This converts GPM to ft³/s and accounts for the area unit (1 GPM = 0.002228 ft³/s, and 1/0.002228 ≈ 448.83).

Q2: What's a typical fluid density for water?
A: Water at 60°F has a density of 62.4 lb/ft³. Other fluids have different densities (e.g., oil ~55 lb/ft³).

Q3: Does this account for friction losses?
A: This calculates only the velocity head component. For complete pressure drop, you'd need to add friction losses.

Q4: How do I find the cross-sectional area?
A: For circular hoses: \( A = \pi \times r^2 \) where r is radius in feet. For other shapes, use appropriate area formulas.

Q5: What's a reasonable pressure drop for hoses?
A: Typically 1-5 psi per 100 ft for most applications, but depends on system requirements.