BSRIA Guide BG 29 2011 Pre Commission Cleaning of Pipework Systems 4th Edition by Reginald Brown ISBN 0860227014 978-0860227014

BSRIA Guide BG 29 2011 Pre Commission Cleaning of Pipework Systems 4th Edition by Reginald Brown – Ebook PDF Instant Download/Delivery: 0860227014,  978-0860227014
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Product details: 

ISBN 10: 0860227014  

ISBN 13: 978-0860227014

Author: Reginald Brown

Thorough pre-commission cleaning of pipework has become even more important with the adoption of energy efficient controls strategies that may result in low flow rates, particularly in terminal units with very small orifices in control valves. This guide provides the latest thinking and good practice cleaning techniques. In particular, it aims to clarify the roles and responsibilities of the parties, improve the exchange of information between them and provide consistency between service offerings of the pre-commission cleaning contractors. Pre-commission cleaning is achieved through a process of flushing and chemical cleaning (where required) followed by the addition of biocides and inhibitors. Systems designed and cleaned in accordance with BSRIA’s guidance are far less likely to experience operating problems.

Table of contents: 

1 INTRODUCTION
2 DESIGN CONSIDERATIONS
2.1 Introduction

2.1.1 General
2.1.2 Responsibilities
2.1.3 When to chemically clean
2.1.4 Specification for system cleaning
2.2 System chemistry

2.2.1 System contaminants
2.2.2 Choice of chemicals
2.2.3 Typical stages of a clean
2.3 Pipework system design

2.3.1 General provisions
2.3.2 Large bore pipework
2.3.3 Plastic pipework
2.3.4 Stainless steel
2.3.5 System facilities
2.3.6 System schematic
2.3.7 Systems with two-port control valves
3 INSPECTION AND WITNESSING
3.1 Timetable
3.2 Monitoring to practical completion

4 INSTALLATION CONSIDERATIONS
4.1 Management

4.1.1 Management
4.1.2 Organisation and planning
4.1.3 Record keeping
4.1.4 Choice of chemicals
4.1.5 COSHH Regulations
4.1.6 Other risks
4.1.7 Consequential damage
4.2 Pipework installation

4.2.1 Materials storage
4.2.2 Good installation practice
4.3 Preparation for flushing and cleaning

4.3.1 Method statements and risk assessments
4.3.2 Installation checks
4.3.3 Drainage
4.3.4 Water supply
4.4 Procedure for filling and pressure testing

4.4.1 System filling
4.4.2 System pressure testing
4.4.3 Basic procedure for pressure testing
5 SYSTEM DYNAMIC FLUSHING
5.1 Flushing objectives

5.1.1 Importance of water velocity

5.2 Dynamic flushing procedure

5.2.1 General considerations
5.2.2 Basic stages of a flush
5.2.3 Dynamic flushing of primary ring-main circuit
5.2.4 Dynamic flushing of secondary mains pipework
5.2.5 Dynamic flushing of horizontal mains to each floor
5.2.6 Final full system flush
5.2.7 Reconnection of terminal units and main plant items

6 CHEMICAL CLEANING PROCEDURE

6.1 Introduction
6.1.1 Importance of pre-flushing
6.1.2 The importance of flow
6.1.3 The importance of temperature
6.1.4 Duration of chemical circulation within the system
6.1.5 Disposal of chemicals

6.2 Cleaning options
6.2.1 Degreasing
6.2.2 Biocide wash
6.2.3 Removal of surface oxides
6.2.4 Effluent disposal/final flushing
6.2.5 Neutralisation
6.2.6 Passivation
6.2.7 Corrosion inhibitor/biocide dosing
6.2.8 Treatment up to practical completion

6.3 On-going water treatment

7 CONNECTIONS BETWEEN NEW AND EXISTING SYSTEMS

7.1 Scope of clean required
7.2 Water sampling

7.3 Shell and core type projects
7.3.1 Provision for future extensions
7.3.2 Temporary pump sets
7.3.3 The cleaning process
7.3.4 Maintaining system cleanliness
7.3.5 Final connection

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Reginald Brown,BSRIA Guide,Commission Cleaning,Pipework Systems