Starting preset — confirm every input • Pipe Pressure Loss Calculator

6" Schedule 40 Steel Pipe Friction Loss (300 GPM Water)

Determine head loss and pressure drop per 100 feet for 300 GPM water in a 6-inch Schedule 40 steel transfer line (ID = 154.1 mm / 6.065 in).

Material & Design StandardASME B36.10M NPS 6" Schedule 40 wall thickness is 7.11 mm (0.280 in). Area = 0.01865 m².
Engineering Velocity / Load CheckCalculated flow velocity is approximately 1.02 m/s; verify minimum transport velocity and settling risk for the service.
SPECIFICATION SHEET • SI METRIC
CAT: PIPE-PUMPING

Pipe Pressure Loss Calculator

Calculate water head loss and friction pressure drop in straight pipe runs using the Darcy-Weisbach equation. This screen is water-only; do not use it for slurry or compressible-gas service.

💡 Engineering Knowledge PrimerPressure drop along straight pipe runs results from wall friction shear stress (Darcy-Weisbach). Accurately calculating head loss prevents pump undersizing and avoids excessive pressure drops across long plant transfer lines.
Scenario values were pre-populated from a saved, shared, or starting preset case. Confirm every value before use.
OPERATING LIMITS — Water-only Darcy–Weisbach calculation. Confirm fittings, fluid properties and duty range.
INPUT DESIGN PARAMETERS (SI)
m³/h
m
mm
mm
CALCULATED SPECIFICATION OUTPUT
Friction Head Loss (hf)
💧
0.19 m
Pressure Drop (Water)1.9 kPa
REAL-TIME HYDRAULIC SCHEMATIC

Pipe Velocity Profile & Flow Regime Visualizer

TURBULENT FLOW
HGL Slope (hf)Vmax = 2.44 m/sPipe ID = 154.05100000000002 mm
Mean Velocity: 2 m/sReynolds Number (Re): 1,50,000Friction Head Loss: 0.19 m

Carry Forward Calculated Result to Next Stage

In industrial design pipelines, calculations naturally feed into downstream tools. Click below to pass your calculated output directly into the next stage:

NEXT STAGE 010.19
Total Dynamic Head

Carry straight-pipe friction head only; add static lift, fittings and discharge requirements in the TDH step.

Related planning checklists

This calculator appears in the following engineering planning checklists:

Pump Cavitation & Energy Cost

Plant Operations Manager
1. Pipe Pressure Loss Calculator2. Static & Total Dynamic Head (TDH)3. NPSH Available Margin Check4. Pump Operating Energy Cost Calculator
1. Plant Water Balance Calculator2. Pipe Velocity & Diameter Sizing3. Reynolds Number Calculator4. Pipe Pressure Loss Calculator5. Static & Total Dynamic Head (TDH)6. Pump Hydraulic Power Calculator7. Pump Operating Energy Cost Calculator
1. Rectangular Tank Volume & Capacity2. Pipe Velocity & Diameter Sizing3. Reynolds Number Calculator4. Pipe Pressure Loss Calculator5. Static & Total Dynamic Head (TDH)6. Pump Hydraulic Power Calculator7. Pump Operating Energy Cost Calculator

Technical Methodology & Engineering Principles

GOVERNING EQUATION
hf = f × (L / D) × (v² / 2g) ΔP = ρ × g × hf
Assumptions & Scope

Steady water flow at approximately 20°C with density 1000 kg/m³ and dynamic viscosity 1 cP; use a validated rheology or compressible-flow model for other fluids.

Operating Range & Boundary

Use finite, physically meaningful inputs within the stated operating assumptions.