Standard
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AS/NZS 5149.2:2016
[Current]Refrigerating systems and heat pumps — Safety and environmental requirements, Part 2: Design, construction, testing, marking and documentation (ISO 5149-2:2014, MOD)
This Standard is applicable to the design, construction, and installation of refrigerating systems, including piping, components, materials, and ancillary equipment directly associated with such systems.
Published: 19/10/2016
Pages: 59
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements for components and piping
4.1 General requirements
4.2 Specific requirements for particular components
4.2.1 Piping joints
4.2.2 Isolating valves
4.3 Materials
4.3.1 Cast iron and malleable iron
4.3.2 Steel, cast steel, carbon steel, and low-alloy steel
4.3.3 High-alloy steel
4.3.4 Stainless steel
4.3.5 Copper and copper alloys
4.3.6 Aluminium and aluminium alloys
4.3.7 Magnesium and magnesium alloys
4.3.8 Zinc and zinc alloys
4.3.9 Soldering alloys
4.3.10 Brazing alloys
4.3.11 Tin and lead tin alloys
4.3.12 Gasket and packing materials
4.3.13 Glass
4.3.14 Asbestos
4.3.15 Plastics
4.4 Testing
4.4.1 General
4.4.2 Strength-pressure test for components
4.4.2.1 General
4.4.2.2 Individual strength-pressure test
4.4.2.3 Type-approved strength-pressure test
4.4.2.4 Fatigue test
4.4.2.5 Acceptance criteria
4.4.3 Tightness
4.5 Marking and documentation
4.5.1 General
4.5.2 Documentation
4.5.3 Fusible plugs
5 Requirements for assemblies
5.1 General
5.2 Design and construction
5.2.1 General
5.2.2 Pressure requirements
5.2.2.1 Maximum allowable pressure (PS)
5.2.2.2 Component maximum allowable pressure
5.2.2.3 Pressure relationships to maximum allowable pressure
5.2.3 Piping and fitting
5.2.3.1 General
5.2.3.2 Flanged joints
5.2.3.3 Flared joints
5.2.3.4 Taper pipe threads
5.2.3.5 Compression joints
5.2.3.6 Requirements for piping installed at site
5.2.3.7 Specific requirements for the installation of piping for equipment intended to use A2, A3, B2, or B3 refrigerants, excluding A1, B1, A2L, and B2L refrigerants
5.2.3.8 Spacing for pipe supports
5.2.3.9 Protection of piping
5.2.3.10 Piping in ducts or shafts
5.2.3.11 Location
5.2.3.12 Accessibility of piping and joints
5.2.3.13 Piping for accessories and measurements
5.2.3.14 Drain and vent connections
5.2.3.14.1 General
5.2.3.14.2 Special requirements
5.2.4 Shut-off devices
5.2.4.1 Isolating valves
5.2.4.2 Hand-operated valves
5.2.4.3 Change of gland packing/seal
5.2.4.4 High-risk release areas
5.2.4.5 Arrangement of shut-off devices
5.2.5 Setting of protection devices
5.2.5.1 General
5.2.5.2 Pressure relief to atmosphere from the low-pressure side
5.2.6 Safety switching devices for limiting the pressure
5.2.6.1 Electro-mechanical safety switching devices for limiting the pressure
5.2.6.2 Electronic safety switching for limiting the pressure
5.2.6.3 Arrangement of safety switching devices
5.2.7 Size calculations for pressure relief devices
5.2.7.1 Calculations
5.2.7.2 Fusible plugs
5.2.7.3 Bursting disc
5.2.7.4 Discharge capacity
5.2.8 Discharge piping from pressure relief devices
5.2.8.1 General
5.2.8.2 Indication device for pressure relief devices
5.2.9 Application of the protection devices
5.2.9.1 General
5.2.9.2 Protection of the refrigerating system against excessive pressure
5.2.9.3 Overflow valves
5.2.9.4 Isolation and arrangement of protection devices for refrigerating systems
5.2.9.5 Protection of the secondary cooling and heating system
5.2.10 Indicating and measuring instruments (monitoring)
5.2.10.1 General
5.2.10.2 Arrangement of refrigerant pressure indicators
5.2.10.3 Liquid level indicators
5.2.11 Electrical requirements
5.2.12 Protection against hot surfaces
5.2.13 Protection against moving parts
5.2.14 Safe handling of equipment
5.2.15 Standstill conditions during transportation
5.2.16 Protection against explosion hazards
5.2.17 Requirements for ventilated enclosures
5.3 Testing
5.3.1 Tests
5.3.2 Strength-pressure test
5.3.3 Tightness test
5.3.3.1 General
5.3.3.2 For self-contained systems with refrigerant charge less than 5 kg which are tested with refrigerant in the system
5.3.3.3 For systems not covered by 5.3.3.2
5.3.3.3.1 Factory test
5.3.3.3.2 Acceptance criteria
5.3.3.3.3 Site tests
5.3.4 Test of the complete installation before putting it into operation
5.3.4.1 General
5.3.4.2 Inspection of refrigerating system
5.3.4.3 Verification of safety devices
5.3.4.3.1 Fitting
5.3.4.3.2 Compliance with appropriate standards
5.3.4.3.3 Safety switching devices for limiting the pressure
5.3.4.3.4 External pressure relief valves
5.3.4.3.5 Bursting discs
5.3.4.3.6 Fusible plugs
5.3.4.4 Refrigerant piping
5.3.4.5 Visual inspection of the complete installation
5.4 Marking and documentation
5.4.1 General
5.4.2 Marking
5.4.2.1 General
5.4.2.2 Refrigerating systems
5.4.2.3 Piping and valves
5.4.3 Documentation
5.4.3.1 Certificates
5.4.3.2 Documentation at operating site
5.4.3.3 Instruction manual
5.4.3.4 Drawings
5.4.3.5 Logbook
Annex A
Annex B
B.1 Systems with a refrigerant charge above 50 kg
B.2 Systems with a refrigerant charge above 4 500 kg
B.3 Emergency stop system for refrigerating systems with a refrigerant charge above 4 500 kg
Annex C
C.1 General
C.2 Safety classification of the refrigerant
C.3 Determination of the maximum allowable pressure of the assembly
C.4 Determination of the state (liquid or gas) of the refrigerant
C.5 Determination of category of components
C.5.1 General
C.5.2 Pressure vessels
C.5.3 Piping
C.5.4 Safety accessories
C.5.5 Joining of pressure equipment
C.5.6 Determination of category of the assembly
Annex D
D.1 General
D.2 Determination of the maximum pressure during abnormal operation
D.2.1 Determination of the pressure at the high-pressure side (PHIS)
D.2.2 Determination of the pressure at the low-pressure side (PLIS)
D.2.3 Determination of PHIS and PLIS for reversible heat pumps
D.3 Strength-pressure test
Annex E
Annex F
Annex G
G.1 General
G.2 Stress corrosion in copper
G.3 Stress corrosion in steel
G.4 Factors that influence stress corrosion cracking
G.4.1 General
G.4.2 Yield strength
G.4.3 Temperature
G.4.4 Oxygen content
G.4.5 Water content
G.4.6 Age of equipment
G.4.7 Avoiding stress corrosion cracking
G.4.8 Conclusions
Bibliography
Appendix ZZ
ZZ1 Scope
ZZ2 Variations
Cited references in this standard
[Superseded]
Graphical symbols - Safety colours and safety signs - Registered safety signs
[Current]
Amendment 1 - Automatic electrical controls - Part 2-6: Particular requirements for automatic electrical pressure sensing controls including mechanical requirements
[Current]
Corrigendum 3 - Household and similar electrical appliances - Safety - Part 2-89: Particular requirements for commercial refrigerating appliances and ice-makers with an incorporated or remote refrigerant unit or motor-compressor
[Current]
Household and similar electrical appliances - Safety - Part 2-40: Particular requirements for electrical heat pumps, air-conditioners and dehumidifiers
Content history
[Current]
[Available Superseded]
DR AS/NZS 5149.2:2016
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