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AS/NZS 5149.2:2016


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
About this publication
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 General Individual strength-pressure test Type-approved strength-pressure test Fatigue test 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 Maximum allowable pressure (PS) Component maximum allowable pressure Pressure relationships to maximum allowable pressure
5.2.3 Piping and fitting General Flanged joints Flared joints Taper pipe threads Compression joints Requirements for piping installed at site 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 Spacing for pipe supports Protection of piping Piping in ducts or shafts Location Accessibility of piping and joints Piping for accessories and measurements Drain and vent connections General Special requirements
5.2.4 Shut-off devices Isolating valves Hand-operated valves Change of gland packing/seal High-risk release areas Arrangement of shut-off devices
5.2.5 Setting of protection devices General Pressure relief to atmosphere from the low-pressure side
5.2.6 Safety switching devices for limiting the pressure Electro-mechanical safety switching devices for limiting the pressure Electronic safety switching for limiting the pressure Arrangement of safety switching devices
5.2.7 Size calculations for pressure relief devices Calculations Fusible plugs Bursting disc Discharge capacity
5.2.8 Discharge piping from pressure relief devices General Indication device for pressure relief devices
5.2.9 Application of the protection devices General Protection of the refrigerating system against excessive pressure Overflow valves Isolation and arrangement of protection devices for refrigerating systems Protection of the secondary cooling and heating system
5.2.10 Indicating and measuring instruments (monitoring) General Arrangement of refrigerant pressure indicators 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 General For self-contained systems with refrigerant charge less than 5 kg which are tested with refrigerant in the system For systems not covered by Factory test Acceptance criteria Site tests
5.3.4 Test of the complete installation before putting it into operation General Inspection of refrigerating system Verification of safety devices Fitting Compliance with appropriate standards Safety switching devices for limiting the pressure External pressure relief valves Bursting discs Fusible plugs Refrigerant piping Visual inspection of the complete installation
5.4 Marking and documentation
5.4.1 General
5.4.2 Marking General Refrigerating systems Piping and valves
5.4.3 Documentation Certificates Documentation at operating site Instruction manual Drawings 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
Appendix ZZ
ZZ1 Scope
ZZ2 Variations
Cited references in this standard
Graphical symbols - Safety colours and safety signs - Registered safety signs
Refrigerants — Designation and safety classification — AMENDMENT 2
Amendment 1 - Automatic electrical controls - Part 2-6: Particular requirements for automatic electrical pressure sensing controls including mechanical requirements
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
Household and similar electrical appliances — Safety — Part 2-40: Particular requirements for electrical heat pumps, air-conditioners and dehumidifiers
Content history
[Available Superseded]
DR AS/NZS 5149.2:2016
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