BS 4434:1989

Foreword
Committees responsible
Specification
Section 1. General
1.0 Introduction
1.1 Scope
1.2 Definitions
1.3 Refrigerant groups
1.4 Categories of occupancy
1.5 Types of cooling system
Section 2. Design and construction
2.1 Refrigerant group and cooling system
2.2 Maximum charge of refrigerant
2.3 Design and maximum working pressures
2.4 Pressure vessels
2.5 Heat exchangers
2.6 Piping and fittings
2.7 Protection against excess pressure
2.8 Instrumentation
Section three. Installation
3.1 General
3.2 Machinery rooms
3.3 Safety provisions for personnel in refrigerated
      spaces
3.4 Refrigerant detectors
3.5 Electrical installations
3.6. Charging and discharging refrigerant
Section four. Testing, inspection, documentation and
marking
4.1 Testing
4.2 Inspection
4.3 Documentation
4.4 Marking
Section five. Instruction manual or leaflet
5.1 Provision of instruction manual or leaflet
5.2 Contents of instruction manual or leaflet
Appendices
A. Refrigerants and their physical properties
B. Materials
C. Pipe supports and hangers
D. Relationship between maximum working pressure and
     other pressures
E. Minimum design pressures for selected refrigerants
F. Ventilation and refrigerant detection in machinery
     rooms
G. Guide to the selection of electrical apparatus for
     hazardous (potentially explosive) areas
H. Guide to the operation and maintenance of
     commercial and industrial refrigerating appliances
     and systems in relation to safety
Tables
1. Group classification of refrigerants
2. Categories of occupancy
3. Types of cooling system
4. Selection of refrigerant group and cooling system
     in relation to category of occupancy
5. Maximum concentration of refrigerant in the event
     of major release
6. Refrigerants and their physical properties
7. Recommended maximum spacings for single pipe
     supports
8. Minimum design pressures
Figures
1. Schematic diagram of the relationship between the
     maximum working pressure and other pressures
     referred to in this standard
2. Selection of electrical apparatus for hazardous
     (potentially explosive) areas

Includes requirements for inspection. Applies to new systems, extensions and modifications and used systems being re-installed on another site. Also applies to the conversion of a system for use with a different refrigerant.