Caution Newer versions. The Code deals with the work involved in proportionally balancing and regulating water flow rates in water distribution systems. It represents standards of good practice which are presented in the form of recommendations and guidance generally accepted within the building engineering services industry. Compliance with this Code should satisfy building control officers that the requirements of Part L of the Building Regulations in respect of commissioning of the water distribution elements of heating, cooling and water services systems have been met.

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All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means electronic or mechanical including photocopying, recording or otherwise without prior written permission of the publisher. Commissioning of water systems is critical in achieving the safe, energy and carbon efficient and effective operation of hydronic systems through correct circuit balancing of distribution and components.

Proper commissioning enables engineering systems to operate at optimum performance and provide the building users with good quality internal environments. Designers and clients are encouraged to consider the requirements for commissioning at an early stage of the design of a project to ensure the statically completed installations may be fully checked and proved.

This Guide has been revised to ensure the most recent knowledge and experience for commissioning building engineering services is made available to practising engineers. The decision to revise the Guide resulted from meeting of commissioning practitioners to consider whether this and the related CIBSE Code W should be updated.

Key issues identified were: x difficulties in commissioning heating systems with low flow rates, particularly fan coil units x the need to review and clarify the tolerance tables in the light of recent experiences. It recognises the need to preserve much of the current format and arrangement enabling it to be used for new and ongoing projects without the need to modify existing contract document or procedures. Practising engineers should not necessarily refer in specifications to the document as a whole but may incorporate particular references from the code and guide in the contract documents thereby providing bespoke definitions applicable to the functional content of the project.

We thank all of the members of the committee for their commitment and expertise. Chemical cleaning The removal of deposits such as scale, corrosion and biofilm from the internal surfaces of pipework by treatment with chemicals and in accordance with a formal procedure.

Commissionable system A system designed, installed and prepared to specified requirements in such a manner as to enable commissioning to be carried out. Commissionability The ability of a system to be commissioned satisfactorily. Commissioning The advancement of an installation from the state of static completion to full working order to specified requirements. For pipework distribution systems it includes the setting to work of an installation and the regulation of flow rates. Commissioning management The planning, organisation, co-ordination and control of commissioning activities.

Commissioning management The firm or person appointed to manage the commissioning process, being organisation responsible for overall planning, supervision and witnessing of the results of the integrated commissioning of all installed building services systems. Commissioning specialist The firm or person appointed to carry out specified duties in connection with the commissioning of the engineering services.

Commissioning specification The document or sub-section of the design specification that prescribes the detailed objectives and requirements for commissioning. Note: the specification must refer to drawings, schedules and relevant parts of the codes, manuals, guides and other standards. Designer The organisation firm or persons responsible for the design of the water services systems that are to be commissioned. Depending on the method of procurement this may be one or more organisation.

In many instances the design intent of the water services systems may be set out by one organisation, with the final selection of some, or all, of the individual components main plant, pumps, terminal equipment, control and regulating valves by another organisation.

Where this is the case the final system flow rates should be provided by the organisation that has selected the components, however this responsibility should be clearly set out in the contract documents.

Design criteria The specified performance of the system expressed as a numerical quantity together with allowable tolerances. Diversity The ratio between the anticipated peak heating or cooling load demand from a system, and the summated maximum heating or cooling capacities of the installed equipment. Pre-commissioning Specified systematic checking of a completed installation to confirm its state of readiness for commissioning.

Note: Pre-commissioning is a post-installation completion activity. Pressure and leakage testing The measurement and recording of a specified pressure retention or loss within a system or system component. Regulating The process of adjusting the flow rates of a fluid in a distribution system to achieve the design flow rates within the tolerances specified by the designer.

Setting to work The process of setting a static system into operation. Static completion The state of a system when it is installed in accordance with the drawings and specification, i. In the case of water systems this includes flushing, cleaning, pressure and leakage testing, filling and venting. System A set of connected components for heating, cooling, ventilation or air conditioning consisting of plant, distribution ducting, piping and terminal units and arrangements to control their operation.

Tolerance The permissible range of variation from the specified design value. Water treatment specialist The firm or person appointed to carry out specified duties in connection with the flushing, chemical cleaning and water treatment of pipework systems. Witnessing authority The firm or person that may sometimes be appointed to witness the results of commissioning, and to verify that results obtained comply with the requirements of the design criteria and commissioning specification.

The commissioning process mainly comprises the setting to work of the system pumps and the regulation or proportional balancing of system flow rates. The procedures set out in this guide, if undertaken, should achieve compliance with the requirements of 1 CIBSE Code W Water Distribution Systems , which sets out the standards of good practice which are generally accepted within the building services industry.

The emphasis of this guide is on heating and cooling systems for buildings chiefly non dwellings although it may also be applied to other types of water distribution systems. The guide is equally applicable to new-build and retrofit applications and is independent of the scale of the system.

Compliance with the requirements of this guide does not confer immunity from, nor imply adherence to, relevant statutory and legal requirements. Unless commissioning is properly considered during both the design and installation stages of a project, it may 1 not be possible to meet the requirements of CIBSE Code W. Section 3 provides a summary of the main commissioning devices available at the time of writing.

Sections 5, 6, 7 and 8 are intended as guidance for commissioning specialists employed to undertake commissioning activities. The ease with which the flow rates in a pipework system can be regulated is often dependent on the level of planning that occurs at the design stage.

The objective should be to design a commissionable system that is easy to regulate and trouble-free in operation. Section 2. The commissioning specification for pipework systems should be developed by the designer to comprise: 1. The scope of the works i. The setting out of the responsibilities of the various parties e. The technical requirements of the commissioning work including: x the standards with which the works should comply e. Related Papers. BG 29 Pre commission cleaning of pipework systems.

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CCW Commissioning Code W: Water Distribution Systems

Log In. Commissioning of buildings and building services is vitally important to the safe and energy efficient operation of buildings but it is not always carried out — or carried out systematically. The effective operation of any water system is dependent on satisfactory circuit balancing and commissioning. This in turn requires adequate attention to commissioning requirements during the design of the system, and a clear specification of requirements.


CCS W Water distribution systems (No longer current but cited in Building Regulations guidance)

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Commissioning Codes

These were four of the sites one of our service engineers, Drew Strong, visited in just one week to provide general service and maintenance as part of their Planned Maintenance contracts — an excellent example of the interesting and varied Latest News. These guides are intended to ensure that water distribution systems are effectively commissioned whilst complying with the latest Building Regulations. CIBSE Commissioning Code W: Water Distribution Systems sets out the general requirements for balancing and commissioning water distribution systems to meet the requirements of the designer. This guide presents a detailed description of the practical aspects of commissioning procedures in a step-by-step format. The Code W tells readers what they need to do to commission water systems while the accompanying BSRIA guide tells them how to go about it.

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