This code of practice has been prepared by a technical committee comprising representatives from the Insurance Council, Classification Societies, Employers’ Federation, Manufacturers’ Association, Heavy Engineering Research Association, NZ Combined Trade Unions, Association of Marine, Aviation and Power Engineers and the Engineering Safety Branch of the Occupational Safety and Health Service. Its purpose is to update and bring together into one document the minimum requirements for the design and safe operation, maintenance and servicing of boiler plant.

This is the first edition of the code and has been superseded by an updated version.

Table of Contents

Notice of Issue
Foreword
Summary of the Health and Safety in Employment Act 1992
Regulations
Approved codes of practice
Employers' duties
Hazard management
Information for employees
Employers to involve employees in the development of health and safety procedures
Training of employees
Safety of people who are not employees
Employees' and self-employed persons' duties
Accidents and serious harm (Recording and notification)

Part 1: General

1.1 Preface
1.2 Scope
1.3 Background
1.4 Definitions
1.5 General
1.6 Supervision
1.7 Existing boilers
1.8 Upgrading existing shell boilers
1.9 Coupled boilers
1.10 Combustion
1.11 Shell-type steam boilers tube plate temperatures
1.12 Fittings
1.13 Water level gauges
1.14 Safety valves
1.15 Pressure gauge
1.16 Blow down valve
1.17 Seismic requirements
1.18 Water treatment
1.19 Feed pumps
1.20 Feedwater systems
1.21 Electrical equipment and supply
1.22 Control components
1.23 Fault alarms and lockouts
1.24 Testing of controls and alarms
1.25 Boiler management control systems including PLC
1.26 Documents and marking
1.27 Obligations of controllers
1.28 Maintenance
1.29 Security and protection
1.30 Quality management quality system for boilers
1.31 System auditing/monitoring
1.32 Method of application for limited-attendance and unattended boilers

Part 2: Attended Boilers

2.1 Boilers with output greater than 20MW
2.2 Attended boilers with outputs not exceeding 20MW
2.3 Controls and mountings
2.4 Low-water cutouts and alarms
2.5 Feedwater control
2.6 Operational supervision
2.7 Daily tests

Part 3: Limited-Attendance Boilers

3.1 Controls and mountings
3.2 First low-water cutout and alarm
3.3 Second low-water cutout and alarm
3.4 Feedwater control
3.5 Feedwater availability
3.6 Feedwater low-pressure alarm
3.7 Forced circulation
3.8 Combustion controls
3.9 Combustion chamber thermal cut out
3.10 Feed pumps/safeguarding against unacceptable evaporation in solid fuel boiler installations
3.11 Alarms
3.12 Visual display
3.13 Operational supervision
3.14 Testing of cutouts and alarms
3.15 Periodic tests
3.16 Water treatment
3.17 Maintenance of the boiler management and safety systems

Part 4: Under 15 HP Boilers

4.1 General
4.2 Controls and mountings
4.3 Operational supervision
4.4 Under 15 hp boilers built to standards other than BS 2790:1982, or earlier editions of that standard
4.5 Under 15 hp boilers designed and built to BS 2790:1982, or to later editions of that standard
4.6 Coupled boilers
4.7 Existing boilers

Part 5: Unattended Boilers

5.1 Operation
5.2 Controls and mountings
5.3 First low-water cut out and alarm
5.4 Second low water cut out and alarm
5.5 Feedwater control
5.6 Feedwater availability
5.7 Feedwater low-pressure alarm
5.8 Forced circulation
5.9 Combustion controls
5.10 Combustion chamber thermal cut out
5.11 Feed pumps /safeguarding against unacceptable evaporation in solid fuel boiler installations
5.12 Alarms
5.13 Visual display
5.14 Operational supervision
5.15 Testing of cut outs and alarms
5.16 Quarterly tests
5.17 Water treatment
5.18 Maintenance of boiler management and safety systems

Part 6: Once-Through Forced Circulation Coil Boilers

6.1 Standards for controls
6.2 Forced circulation coil boilers
6.3 Feedwater pump
6.4 Pressure safety

Part 7: Low-Hazard Boilers

7.1 Standards for controls
7.2 Operational supervision

Part 8: Pressurised Hot Water Boilers

8.1 Standards
8.2 Types of system
8.3 Automatic controls
8.4 Independent overriding controls
8.5 Electrical failure to safety
8.6 Interruption of the electricity supply
8.7 Boilers using mixing valves
8.8 Safety valves
8.9 Training
8.10 Testing and maintenance

Part 9: Unfired Waste Heat Boilers

9.1 Definition
9.2 Design
9.3 Safety protection devices

Appendix A: Principal Standards Accepted for use in New Zealand in Connection with Boilers

1. New Zealand Standards
2. Joint Australian/New Zealand Standards
3. Australian Standards
4. British Standards
5 USA Standards
6. Existing boilers

Appendix B: Clauses from AS 2593:1990 to be Considered for Boiler Design Purposes

Appendix C: Information Required by Authority with First Application to Operate an Unattended or Limited-Attendance Boiler

SECTION A: Method of application for limited-attendance boiler operation and unattended boiler operation
SECTION B: Quality management systems for boiler installations

Appendix D: Classification Societies Accepted in New Zealand by this Authority

Appendix E: Verification of Boiler Management System For Limited-Attendance and Unattended Boilers