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Advanced Cicerone® · Keeping and Serving Beer

Resistance to flow from draft system elements

Syllabus Path

Resistance comes from beer-line length, internal diameter, material, fittings, couplers, FOBs, faucets, flow-control devices, and vertical lift. Calculate resistance conceptually before changing the regulator: identify line restriction, lift, hardware, and the desired faucet flow.

  1. I. Keeping and Serving Beer
  2. D. Draft principles
  3. 2. Resistance to flow from draft system elements

Study Guide

Read the full study guide: Complete Guide to Draft Beer Systems

Exam Focus

  • Explain resistance to flow from draft system elements as a service topic within Draft principles.
  • Account for restriction contributed by beer line length and diameter, fittings, elevation, faucets, and other inline components.
  • Balance total system resistance against the pressure needed to maintain carbonation so target flow is achieved without chronic foam or breakout.

Core knowledge

  • Resistance comes from beer-line length, internal diameter, material, fittings, couplers, FOBs, faucets, flow-control devices, and vertical lift.
  • Static resistance is elevation change; dynamic resistance is friction and hardware restriction while beer is moving.
  • Too little resistance can create fast, turbulent, foamy pours; too much resistance can create slow pours and pressure-balancing problems.

Study application

Calculate resistance conceptually before changing the regulator: identify line restriction, lift, hardware, and the desired faucet flow.

Key Terms

Static resistance
Static resistance is elevation change; dynamic resistance is friction and hardware restriction while beer is moving.
Too little resistance
Too little resistance can create fast, turbulent, foamy pours; too much resistance can create slow pours and pressure-balancing problems.

References

2 available