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KS9: Commissioning variable flow pipework systems
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KS9: Commissioning variable flow pipework systems

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This publication describes commissioning procedures for variable flow recirculating heating and chilled water pipework distribution systems. The guidance has been produced to complement that given in CIBSE Knowledge Series KS7: Variable flow pipework systems.

CIBSE Guide KS7 describes two main approaches to the successful design of variable flow heating and chilled water distribution systems:

  • designs utilising self-balancing layouts
  • designs incorporating differential pressure control valves (DPCVs).

The commissioning procedures set out in this publication focus on these two design approaches. Descriptions are given of the main system features and components, their intended functions, and the appropriate commissioning procedures required. In this respect, this guide is a particular application of the general commissioning principles laid out in CIBSE Code W: Water distribution systems.

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Buy Commissioning Variable Flow Pipework Systems and KS07: Variable Flow Pipework Systems together for a special price of £32 for members and £64 for non-members


1. Introduction

1.1 Pre-commissioning checks

2. Self-balancing arrangements

2.1 Design for commissioning
2.2 Flow balancing

3. Designs incorporating DPVCs

3.1 Design for commissioning
3.2 Flow balancing

4. Final tests at pumps

5. Tolerances


Appendix A1: Valve types

A1.1 Commissioning sets (fixed orifice double regulating valves)
A1.2 Differential pressure control valves (DPCVs)


Principal author: Chris Parsloe

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