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CIBSE Commissioning Code W offers essential guidance for the commissioning of closed, recirculating hydronic heating and cooling systems. Developed in collaboration with BSRIA and the Commissioning Specialists Association (CSA), the Code outlines procedures for both pre-functional (pre-commissioning and static testing) and functional performance testing (system commissioning, flow regulation, and final performance testing). While based on UK practices, the principles apply broadly to closed pipework systems.
Code W is intended to be used alongside CIBSE Commissioning Code M: Commissioning Management, as well as relevant BSRIA and CSA documents.
Whether you're a commissioning engineer, consultant, or facilities professional, Code W is a key resource for ensuring robust system performance and project success.
Contents
Symbols
1 Introduction
2 Scope and purpose
2.1 Scope
3 The design stage
3.1 Specific system specification
3.2 Programme commissioning activities
3.3 System commissionability reviews
3.4 Appointment of commissioning specialist
4 On-site stage — pre-functional testing
4.1 Objectives
4.2 Method statements and methodologies
4.3 Factory acceptance testing
4.4 System installation checks
5 On-site stage — functional testing
5.1 Preliminary checks
5.2 System filling and pressure testing
5.3 Equipment start-up
5.4 Pre-commission cleaning
5.5 Ongoing water quality monitoring
5.6 System balancing
5.7 System performance testing
5.8 Handover of commissioning-related documentation
5.9 Demonstration and acceptance
6 The in-use stage
6.1 Review commissioning of the project
6.2 Fine-tuning and seasonal testing
6.3 Post-project review
6.4 Ongoing commissioning
6.5 Water quality monitoring
7 Definitions
8 References and bibliography
8.1 References
8.2 Bibliography
Appendix A: Designer’s implications and requirements
A.1 Design requirements
A.2 Design information
A.3 Tolerances
A.4 Flow velocity
A.5 Pump flow rate margin
A.6 Valve sizing
A.7 Provisions for pressure measurements
A.8 Ease of access
Appendix B: Flow measurement, regulation and differential pressure control
B.1 Flow measurement devices
B.2 Regulating valves
B.3 Combined flow measurement and regulating devices
B.4 Combined flow regulation and differential pressure control valves
B.5 Correct sizing and positioning of commissioning devices
B.6 Access to flow measurement and regulating devices
B.7 Factors affecting flow measurement accuracy
B.8 Instrumentation
B.9 Flow coefficients
Author: Chris Parsloe (Parsloe Consulting)
Steering Committee: Ted Pilbeam (CIBSE/independent consultant) (Chair), Tony Anderson (CSA) (Vice Chair),
David Bleicher (BSRIA), Paul McSoley (independent consultant), James Campbell (Troup
Bywaters + Anders), Keith Barker (independent consultant), Thomas Dunn (Banyards),
Tom Bradbury (HDR), Martin Williamson (ECS), Neil Smith (VolkeFitzpatrick), Barrie Daniel (Arup), Neil Gibson (Crane Fluid Systems), Rober Fowler (Frese Ltd)
Peer reviewers: Ed Picton (Cirrus+), Roger Carlin (Ashford Group), David Green (independent consultant)