Water Pressure Loss Hose

Overview

Engineering reference data for Water Pressure Loss Hose in water systems.

Key Formulas

Hydrostatic Pressure

$P = \rho g h$

Pressure due to water column.

Flow Rate

$Q = A v$

Area × velocity.

Variables

Symbol	Description	Unit
$P$	Pressure	Pa
$Q$	Flow rate	m³/s
$h$	Head/depth	m

Unit Conversions

Conversion	Value
1 psi	6.9 kPa = 0.069 bar
1 ft (foot)	0.3048 m
1 gal (US)/min	6.30888×10⁻⁵ m³/s = 0.227 m³/h

Example: Pressure Loss in a Garden Hose

Given:

• Flow rate: 2 gpm (7.6 L/min)
• Hose nominal diameter: 1/2" (internal diameter: 0.5 in)
• Hose length: 82 ft (25 m)

From chart (or diagram):
Pressure loss per 100 ft for this flow rate and hose size ≈ 5 psi.

Calculation:
Total pressure drop is calculated by scaling the loss per unit length:

$\Delta p = \left( \frac{5 \text{ psi}}{100 \text{ ft}} \right) \times \frac{82 \text{ ft}}{100 \text{ ft}} \approx 4.1 \text{ psi}$

(Using 80 ft in the example as an approximation: $5 \times 0.8 = 4$ psi)

Convert to bar:
$4 \text{ psi} \times 0.069 \text{ bar/psi} = 0.276 \text{ bar}$

This example illustrates how to use pressure loss per 100 ft values from charts to find the total pressure drop for a specific hose length.

Interactive Charts

References

• Original Source