Standard 15-2007, Safety Standard for Refrigeration Systems (ANSI Approved) (Packaged with Standard 34-2007, Designation and Safety Classification of Refrigerants [ANSI Approved])

This standard specifies safe design, construction, installation, and operation of refrigeration systems. It also establishes safeguards for life, limb, health, and property, and prescribes safety requirements. This standard applies (a) to the design, construction, test, installation, operation, and inspection of mechanical and absorption refrigeration systems, including heat pump systems used in stationary applications, (b) to modifications including replacement of parts or components if they are not identical in function and capacity, and (c) to substitutions of refrigerant having a different designation.

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4	FOREWORD FOREWORD
5	1. PURPOSE 1. PURPOSE 2. SCOPE 2. SCOPE 2.1 2.1 This standard establishes safeguards for life, limb, health, and property and prescribes safety requirements. 2.2 2.2 This standard applies 3. DEFINITIONS 3. DEFINITIONS
7	4. OCCUPANCY CLASSIFICATION 4. OCCUPANCY CLASSIFICATION 4.1 4.1 Locations of refrigerating systems are described by occupancy classifications that consider the ability of people to respond to potential exposure to refrigerant as follows.
8	4.2 4.2 Equipment, other than piping, located outside a building and within 20 ft (6.1 m) of any building opening shall be governed by the occupancy classification of the building. 5. REFRIGERATING SYSTEM CLASSIFICATION 5. REFRIGERATING SYSTEM CLASSIFICATION 5.1 Refrigerating Systems. 5.1 Refrigerating Systems. These systems are defined by the method employed for extracting or delivering heat as follows (see Figure 1). 5.2 Refrigeration System Classification. 5.2 Refrigeration System Classification. For the purpose of applying Tables 1 and 2, a refrigerating system shall be classified according to the degree of probability that a leakage of refrigerant will enter an occupancy-classified area as follows.
10	5.3 Changing Refrigerant. 5.3 Changing Refrigerant. A change in the type of refrigerant in a system shall not be made without the notification of the auth… 6. REFRIGERANT SAFETY CLASSIFICATION 6. REFRIGERANT SAFETY CLASSIFICATION 6.1 Single-Compound Refrigerants. 6.1 Single-Compound Refrigerants. Single-compound refrigerants shall be classified into safety groups, based on toxicity and fla… 6.2 Blends. 6.2 Blends. Refrigerant blends shall be classified following the worst-case of fractionation composition, determined in accordance with Standard 34.1 For blends assigned only a single safety group in Standard 34, that classification shall be used. 7. RESTRICTIONS ON REFRIGERANT USE 7. RESTRICTIONS ON REFRIGERANT USE 7.1 General. 7.1 General. The occupancy, refrigerating system, and refrigerant safety classifications cited in this section shall be determined in accordance with Sections 4, 5, and 6, respectively. 7.2 Refrigerant Quantity Limits. 7.2 Refrigerant Quantity Limits. The quantity of refrigerant in each independent circuit of high probability systems shall not e…
11	7.3 Volume Calculations. 7.3 Volume Calculations. The volume used to determine the refrigerant quantity limits for refrigerants in Section 7.2 shall be based on the volume of space to which refrigerant disperses in the event of a refrigerant leak. 7.4 Location in a Machinery Room or Outdoors. All components containing refrigerant shall be located either in a machinery room or outdoors, where 7.4 Location in a Machinery Room or Outdoors. 7.5 Additional Restrictions 7.5 Additional Restrictions
12	8. INSTALLATION RESTRICTIONS 8. INSTALLATION RESTRICTIONS 8.1 Foundations. Foundations and supports for condensing units or compressor units shall be of noncombustible construction and c… 8.1 Foundations. 8.2 Guards. Moving machinery shall be guarded in accordance with approved safety standards.3 8.2 Guards. 8.3 Safe Access. A clear and unobstructed approach and space shall be provided for inspection, service, and emergency shutdown o… 8.3 Safe Access. 8.4 Water Connections. Water supply and discharge connections shall be made in accordance with the requirements of the authority having jurisdiction. 8.4 Water Connections. 8.5 Electrical Safety. Electrical equipment and wiring shall be installed in accordance with the National Electrical Code4 and the requirements of the authority having jurisdiction. 8.5 Electrical Safety. 8.6 Gas Fuel Equipment. Gas fuel devices and equipment used with refrigerating systems shall be installed in accordance with approved safety standards and the requirements of the authority having jurisdiction. 8.6 Gas Fuel Equipment. 8.7 Air Duct Installation. Air duct systems of air-conditioning equipment for human comfort using mechanical refrigeration shall… 8.7 Air Duct Installation. 8.8 Refrigerant Parts in Air Duct. Joints and all refrigerant-containing parts of a refrigerating system located in an air duct … 8.8 Refrigerant Parts in Air Duct. 8.9 Refrigerant Pipe Joint Inspection. Refrigerant pipe joints erected on the premises shall be exposed to view for visual inspection prior to being covered or enclosed. 8.9 Refrigerant Pipe Joint Inspection. 8.10 Location of Refrigerant Piping 8.10 Location of Refrigerant Piping
13	8.11 Refrigerating Machinery Room, General Requirements. When a refrigerating system is located indoors and a machinery room is required by Section 7.4, the machinery room shall be in accordance with the following provisions. 8.11 Refrigerating Machinery Room, General Requirements.
14	8.12 Machinery Room, Special Requirements. In cases specified in the rules of Section 7.4, a refrigerating machinery room shall meet the following special requirements in addition to those in Section 8.11: 8.12 Machinery Room, Special Requirements. 8.13 Manual Emergency Discharge of Ammonia Refrigerant. When required by the authority having jurisdiction, manual emergency dis… 8.13 Manual Emergency Discharge of Ammonia Refrigerant. When required by the authority having jurisdiction, manual emergency dis… 8.14 Purge Discharge. 8.14 Purge Discharge. The discharge from purge systems shall be governed by the same rules as pressure-relief devices and fusible plugs (see Section 9.7.8) and shall be piped in conjunction with these devices. 9. DESIGN AND CONSTRUCTION OF EQUIPMENT AND SYSTEMS 9. DESIGN AND CONSTRUCTION OF EQUIPMENT AND SYSTEMS 9.1 Materials 9.1 Materials 9.2 System Design Pressure 9.2 System Design Pressure
15	9.3 Refrigerant-Containing Pressure Vessels 9.3 Refrigerant-Containing Pressure Vessels 9.4 Pressure-Relief Protection 9.4 Pressure-Relief Protection
16	9.5 Setting of Pressure-Relief Devices 9.5 Setting of Pressure-Relief Devices 9.6 Marking of Relief Devices and Fusible Plugs 9.6 Marking of Relief Devices and Fusible Plugs 9.7 Pressure Vessel Protection 9.7 Pressure Vessel Protection
18	9.8 Positive Displacement Compressor Protection. When equipped with a stop valve in the discharge connection, every positive dis… 9.8 Positive Displacement Compressor Protection. When equipped with a stop valve in the discharge connection, every positive dis… 9.9 Pressure-Limiting Devices 9.9 Pressure-Limiting Devices
23	9.10 Refrigerant Piping, Valves, Fittings, and Related Parts 9.10 Refrigerant Piping, Valves, Fittings, and Related Parts 9.11 Components Other Than Pressure Vessels and Piping 9.11 Components Other Than Pressure Vessels and Piping 9.12 Service Provisions 9.12 Service Provisions 9.13 Fabrication 9.13 Fabrication
24	9.14 Factory Tests 9.14 Factory Tests 9.15 Nameplate. 9.15 Nameplate. Each unit system and each separate condensing unit, compressor, or compressor unit sold for field assembly in a … 10. OPERATION AND TESTING 10. OPERATION AND TESTING 10.1 Field Tests 10.1 Field Tests
25	10.2 Declaration. 10.2 Declaration. A dated declaration of test shall be provided for all systems containing 55 lb (25 kg) or more of refrigerant…. 11. GENERAL REQUIREMENTS 11. GENERAL REQUIREMENTS 11.1 General Restrictions-Safeguards 11.1 General Restrictions-Safeguards. Means shall be taken to adequately safeguard piping, controls, and other refrigerating equipment to minimize possible accidental damage or rupture by external sources. 11.2 Signs and Identification 11.2 Signs and Identification 11.3 Charging, Withdrawal, and Disposition of Refrigerants. 11.3 Charging, Withdrawal, and Disposition of Refrigerants. No service containers shall be left connected to a system except whi… 11.4 Containers. 11.4 Containers. Containers used for refrigerants withdrawn from a refrigerating system shall be as prescribed in the pertinent … 11.5 Storing Refrigerant. 11.5 Storing Refrigerant. The total amount of refrigerant stored in a machinery room in all containers not provided with relief … 11.6 Maintenance. 11.6 Maintenance. Refrigerating systems shall be maintained by the user in a clean condition, free from accumulations of oily dirt, waste, and other debris, and shall be kept accessible at all times. 11.7 Responsibility for Operation and Emergency Shutdown. 11.7 Responsibility for Operation and Emergency Shutdown. It shall be the duty of the person in charge of the premises on which …
26	12. Precedence with Conflicting Requirements 12. Precedence with Conflicting Requirements 13. Listed Equipment 13. Listed equipment Informative APPENDIX A CALCULATIONS OF THE MAXIMUM ALLOWABLE CONCENTRATION (Cm) OF A BLEND informative APPENDIX A CALCULATIONS OF THE MAXIMUM ALLOWABLE CONCENTRATION (Cm) OF A BLEND A1. FOR 100 LB OF BLEND, DETERMINE THE IDEAL GAS VOLUMES OCCUPIED BY EACH COMPONENT AND BY THE BLEND AT 70Ã‹Å¡F AND 1 ATM A1. FOR 100 LB OF BLEND, DETERMINE THE IDEAL GAS VOLUMES OCCUPIED BY EACH COMPONENT AND BY THE BLEND AT 70Ã‹Å¡F AND 1 ATM A2. Determine the dilution volume required for the 100 lb of blend and each component therein A2. Determine the dilution volume required for the 100 lb of blend and each component therein A3. Determine the maximum allowable concentration (Cm) of a blend A3. Determine the maximum allowable concentration (Cm) of a blend Informative APPENDIX B GUIDELINES FOR EMERGENCY DISCHARGE OF REFRIGERANTS WHEN REQUIRED BY LOCAL CODES informative APPENDIX B GUIDELINES FOR EMERGENCY DISCHARGE OF REFRIGERANTS WHEN REQUIRED BY LOCAL CODES B1. INTRODUCTION B1. INTRODUCTION B2. Emergency Discharge Lines B2. Emergency Discharge Lines
27	B3. Stop Valves B3. Stop Valves B4. Sizing Valves and Lines B4. Sizing Valves and Lines B5. High- to Low-Pressure Valve B5. High- to Low-Pressure Valve B6. DIFFUSER B6. DIFFUSER B7. SIZING HEADERS AND DIFFUSERS B7. SIZING HEADERS AND DIFFUSERS B8. Location of Diffuser B8. Location of Diffuser B9. Provide Drip Legs B9. Provide Drip Legs B10. Ammonia Diffusion Systems B10. Ammonia Diffusion Systems B11. Ammonia Discharge Lines B11. Ammonia Discharge Lines B12. Ammonia Flares B12. Ammonia Flares B13. Water Tanks B13. Water Tanks B14. Basins B14. Basins B15. Ammonia-Water Mixers B15. Ammonia-Water Mixers B16. Design Responsibility B16. Design Responsibility Normative APPENDIX C REFRIGERANT CLASSIFICATION SCHEME normative APPENDIX C REFRIGERANT CLASSIFICATION SCHEME
28	Informative APPENDIX D INFORMATIVE REFERENCES informative APPENDIX D INFORMATIVE REFERENCES Normative APPENDIX E NORMATIVE REFERENCES normative APPENDIX E NORMATIVE REFERENCES
29	Informative APPENDIX F METHOD FOR CALCULATING DISCHARGE CAPACITY OF POSITIVE DISPLACEMENT COMPRESSOR PRESSURE-RELIEF DEVICE informative APPENDIX F METHOD FOR CALCULATING DISCHARGE CAPACITY OF POSITIVE DISPLACEMENT COMPRESSOR PRESSURE-RELIEF DEVICE
30	Normative APPENDIX H ALLOWABLE EQUIVALENT LENGTH OF DISCHARGE PIPING normative APPENDIX H ALLOWABLE EQUIVALENT LENGTH OF DISCHARGE PIPING
31	Informative Appendix I Emergencies in Refrigerating Machinery Rooms informative Appendix I Emergencies in Refrigerating Machinery Rooms I1. Alarm Levels I1. Alarm Levels I2. Alternate Refrigerant Level Measurements I2. Alternate Refrigerant Level Measurements I3. Reentry into Refrigerating Machinery Rooms I3. Reentry into Refrigerating Machinery Rooms
32	I4. Example Emergency Procedures I4. Example Emergency Procedures Informative appendix j addenda description information informative appendix j addenda description information

Published By	Publication Date	Number of Pages
ASHRAE	2007	37


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Standard Title	ASHRAE Standard 15-2007 Safety Standard for Refrigeration Systems (packaged w/ Standard 34-2007)
Published Code	ASHRAE
Publication Date	2007
Pages Count	37

ASHRAE 15 07:2007 Edition

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