BS 4434:1995

Committees responsible
Foreword
Specification
Introduction
Section 1. General
1.1 Scope
1.2 References
1.3 Definitions
1.4 Refrigerant groups
1.5 Categories of occupancy
1.6 Types of cooling system
Section 2. Design and construction
2.1 Refrigerant group and cooling system
2.2 Maximum charge of refrigerant and restrictions on
      use
2.3 Design pressure and allowable pressure
2.4 Pressure vessels
2.5 Heat exchangers
2.6 Piping and fittings
2.7 Protection against excess pressure
2.8 Instrumentation
Section 3. 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 4. Testing, inspection, documentation and
            marking
4.1 Testing
4.2 Inspection
4.3 Documentation
4.4 Marking
Section 5. Instruction manual or leaflet
5.1 Provision of instruction manual or leaflet
5.2 Contents of instruction manual or leaflet
Annexes
A (informative) Materials
B (informative) Pipe supports and hangers
C (informative) Relationship between allowable
      pressure and other pressures
D (informative) Ventilation and refrigerant
      detection in machinery rooms
E (informative) Guide to the selection of electrical
      apparatus for hazardous (potentially explosive)
      areas
F (informative) Guide to the operation and
      maintenance of commercial and industrial
      refrigerating appliances and systems in relation
      to safety
Tables
1 Safety group classification of refrigerants as
      determined by flammability and toxicity
2 Classification of refrigerants
3 Categories of occupancy
4 Types of cooling system
5 Selection of refrigerant group and cooling system
      in relation to category of occupancy
6 Minimum system design temperatures
7 Relationship between the various pressures and
      the allowable pressure (ps0
8 Values of f for different refrigerants
B.1 Recommended maximum spacing for single pipe
      supports
Figures
C.1 Schematic diagram of the relationship between
      allowable pressure and other pressures referred
      to in this standard
E.1 Selection of electrical apparatus for hazardous
      (potentially explosive) areas
List of references

Specifies requirements for the safety aspects of the design, construction, installation and inspection of refrigerating appliances and systems to be used or installed in public assembly, institutional, residential, industrial and commercial premises. Applies to new refrigerating systems, to extensions and modifications of existing systems and to used systems that are being re-installed and operated on another site.