Process Engineering Reference Sheets by MyEngineeringTools.com
THE CALCULATORS

In-Line Blending Ratio Control

Calculates the required flow ratio and additive flow rate to achieve a target blended concentration in an in-line blending system, along with checking pipe velocity and Reynolds number for operational guidance.

📖 Need the theory? Read the methodology, assumptions, and equations in the full reference guide.
Read In-Line Blending Ratio Control Guide →

1. Define Input Parameters

2. Engineering Output

Water flow rate in SI units (Q1)
- m³/s
Required flow ratio Q2/Q1 (ratio)
- dimensionless
Required additive flow rate (Q2_L)
- L/min
Pipe cross-sectional area (A)
- m²
Mean velocity of water stream (v1)
- m/s
Reynolds number for water stream (Re1)
- dimensionless

Need this calculation offline?

Download Offline Excel Calculation

Context & Assumptions

In-line blending ratio control is used in water treatment, food & beverage, specialty chemicals, and pharmaceuticals to adjust two process streams so their combined composition meets a specified target without using an agitated vessel. This saves space, reduces hold-up, and avoids off-spec product.

Understand the Engineering Principles

Review the step-by-step derivations, typical industrial limits, and scale-up rules.

Looking for more tools?

Explore our full library of interactive Process Engineering calculators.

View the Calculator Index