Fire Protection

Standpipe Hose Valve Friction Loss and Residual Pressure Diagnostic Calculator

Standpipe Hose Valve Friction Loss and Residual Pressure Diagnostic Calculator engineering calculator.

Quick Answer

Calculate Standpipe Hose Valve Friction Loss and Residual Pressure Diagnostic Calculator

Calculator

Friction pressure loss (Pa)
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Result Interpretation

Standpipe Hose Valve Friction Loss and Residual Pressure Diagnostic Calculator computes Friction pressure loss in Pa using the defined engineering formula and the input values provided.

Worked Example

Verified calculation

Given:

  • Internal diameter of hose valve = 0.0635
  • Hose valve equivalent length = 2.5
  • Darcy friction factor = 0.025
  • Flow velocity through valve = 7.2
  • Density of water = 998.2

Expected Result:

  • Friction pressure loss = 25465.88976378

Engineering Interpretation:

Under the given input conditions, the calculated result is: Friction pressure loss = 25465.88976378 Pa.

The actual numerical result is computed by the Runtime engine using the persisted tool definition. The values shown here come from automatically validated test cases.

Formula / Method

friction pressure loss = darcy friction factor * (hose valve equivalent length / internal diameter of hose valve) * (density of water * pow(flow velocity through valve, 2) / 2)

Formula family: formula_fire_standpipe_hose_valve_friction_loss_residual_pressure_diagnostic_calculator

Variables

SymbolLabelRoleDescription
f Darcy friction factor INPUT Darcy friction factor
L Hose valve equivalent length INPUT Hose valve equivalent length
D Internal diameter of hose valve INPUT Internal diameter of hose valve
rho Density of water INPUT Density of water
v Flow velocity through valve INPUT Flow velocity through valve
pressure_drop Friction pressure loss OUTPUT Friction pressure loss

Calculation Steps

  1. Enter the darcy friction factor in dimensionless.
  2. Enter the hose valve equivalent length in m.
  3. Enter the internal diameter of hose valve in m.
  4. Enter the density of water in kg/m³.
  5. Enter the flow velocity through valve in m/s.
  6. Step 1: Compute friction pressure loss.
  7. Read the friction pressure loss (Pa) from the results.

Engineering Summary

Calculate Standpipe Hose Valve Friction Loss and Residual Pressure Diagnostic Calculator

Frequently Asked Questions

What does this calculator calculate?

The Standpipe Hose Valve Friction Loss and Residual Pressure Diagnostic Calculator estimates Friction pressure loss based on the input parameters you provide

Why is darcy friction factor important in this calculation?

darcy friction factor is directly proportional to friction pressure loss. When you enter darcy friction factor in dimensionless, the calculator uses it in the engineering formula to compute the output

How should I interpret the result friction pressure loss?

The calculator outputs friction pressure loss in Pa. For higher pressures, divide by 1000 to express in kPa, or by 101325 for atmospheres. The result is computed directly from the input values using the defined engineering formula

What units should I use for the inputs?

Enter each value in the units shown next to the input field: Darcy friction factor (dimensionless), Hose valve equivalent length (m), Internal diameter of hose valve (m), Density of water (kg/m³), Flow velocity through valve (m/s). Make sure all inputs use the specified units for consistent results

What assumptions does this calculator use?

This calculator uses automatically validated engineering formulas. Results are approximate and should be validated against site-specific conditions, applicable codes, and professional engineering judgment

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