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BS EN 17893:2024

BS EN 17893:2024

$215.11

Thermal road vehicles. Temperature-controlled systems using flammable refrigerants for transport of goods. Requirements and risk analysis process

Published By Publication Date Number of Pages
BSI 2024 86
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This document specifies requirements for the use of flammable refrigerants class A2L, A2 and A3 as defined in ISO 817 with regard to: – design and construction of the refrigerating system (as far as not specified in EN 378-2); – operation; – in all anticipated operational modes and locations; – including continuous idling during standstill; – service, maintenance and decommissioning; – for the investigation and mitigation of risk for thermally insulated means of transport, including: trucks, trailers, tanks, vans (light commercial vehicles), wagons, containers for land transport, small containers, packaging. This document describes an Operational Mode Risk Assessment (OMRA), which uses methods such as Hazard and Operability Analysis (HAZOP), Failure Mode and Effects and Criticality Analysis (FMECA), or Fault Tree Analysis (FTA) or a combination of these methods. The document specifies requirements: – for the validation of possible safety concepts and protective devices within the OMRA process, including charge release tests, simulation, and function tests of the associated protective equipment; – for tests related to the application; – using methodologies to achieve tolerable risk values. Mobile air conditioning systems in cars are covered in ISO 13043 and refrigerated containers conforming to ISO 20854 are excluded. This document could be used for class “B” refrigerants providing the OMRA is adjusted to account for their specific properties.

PDF Catalog

PDF Pages PDF Title
2 undefined
9 1 Scope
2 Normative references
10 3 Terms and definitions
20 4 Symbols and abbreviated terms
21 5 Risk assessment
5.1 General
5.1.1 General requirements
5.1.2 Safety principles
5.1.3 Safety concept
22 5.2 Characteristics of Flammable refrigerants
5.3 Significant hazards
23 5.4 Protection against hazards
5.4.1 Protection against fire, flame propagation and explosion hazards
5.4.2 Protection against excessive internal system pressure
5.5 Operational mode risk assessment
5.5.1 General
24 5.5.2 Operational modes
26 5.5.3 Evaluation of leak rate and frequencies for characterization
27 5.5.4 Control volume
5.5.5 Risk assessment for flammable refrigerants
28 5.6 Tolerable risk
5.6.1 General
5.6.2 Risk reduction
29 5.6.3 Tolerable risk criteria
5.7 Auditing and effectiveness check of safety concepts
30 6 Requirements for design and construction of the TRU
6.1 General
6.2 Components and piping of refrigerating systems with flammable refrigerant
6.2.1 General
31 6.2.2 External fire relief device
6.3 Assembly of TRU on van, truck and trailer
32 6.4 Interior of the compartment volume
6.4.1 General
6.4.2 Inside compartment heat exchanger
6.4.2.1 General
6.4.2.2 Heat exchanger zoning concept
6.4.2.3 Indirect heat exchanger concept
33 6.4.2.4 Heat exchanger separation mechanism
6.4.3 Ventilation inside the compartment volume
6.4.4 Refrigerant detectors
6.4.5 Evaluation of surface temperatures
34 6.4.6 Electrical components
6.5 Outside electrical components (cabinet)
6.6 Refrigerant charge
6.7 Alarm system
6.7.1 General
35 6.7.2 Alarm system power
6.8 Testing
6.8.1 General
6.8.2 Testing of safety concept and protective devices
36 6.8.3 Testing the air tightness of the compartment volume to determine the dilution of release
6.8.4 Corrosion testing
6.8.5 Vibration type-test
37 6.8.6 Shock and impact type test
6.8.7 Final system test before putting into operation
38 6.9 Marking and documentation
6.9.1 General
6.9.2 Marking
39 6.9.3 Manuals and documentation
6.9.3.1 General
6.9.3.2 Operation and service manual
40 7 Requirements for the TRU manufacturer ensuring safe service, maintenance, repair
7.1 General
41 7.2 Providing education and training
7.3 Instruction for maintenance and repair
7.4 Providing safety instructions
42 7.5 Providing a self-check mechanism
8 Safe operation at different operating sites
8.1 General
44 8.2 Operating sites
46 8.3 Significant hazards at operating sites
8.4 Ventilating condition at operating sites
8.4.1 General
47 8.4.2 Requirements for operation in open air
8.4.3 Requirements for operation in well-ventilated areas
8.4.4 Requirements for operation in non-well-ventilated areas
48 8.4.5 Operation in non-ventilated areas
8.5 Requirements for opening of door(s) and for loading and unloading of goods
49 8.6 Electrical installations at operating sites
8.7 Operator instruction for handling of alarms
50 8.8 Accidents
8.8.1 General
8.8.2 Measures for accidents prevention
51 8.8.3 Measures after accidents
52 8.9 Operating instructions, manuals, guidelines at operating sites
9 Servicing recommendations and requirements at operating sites
9.1 General
9.2 Operating sites with service activities
9.2.1 General
53 9.2.2 General requirements
9.2.3 Instruction of personnel
9.2.4 General failure prevention
54 9.3 Assembly of TRU at the vehicle and inside the compartment volume
9.4 Repair and maintenance on the vehicle or the body structure
9.5 Repair and maintenance on the TRU including refrigerating system repair
9.5.1 General
55 9.5.2 Instruction of personnel
56 9.5.3 Work area requirements
9.5.4 Inspection
57 9.5.5 System failure indication
9.5.6 Actions and procedure for refrigerating system repair
9.5.6.1 General
9.5.6.2 Removal, evacuation of refrigerant
58 9.5.6.3 Draining the oil from a refrigerating system
9.5.6.4 Procedures for changing of components
9.5.6.5 Hot works
59 9.5.6.6 Repair of protective device(s)
9.5.6.7 Leak detection
60 9.5.6.8 Charging procedures
9.5.7 Tools and equipment
9.5.8 Testing after repair
9.5.9 Failure prevention for maintenance and refrigerating system repair
61 9.5.10 Documentation
9.6 Handling, recovery, reuse and disposal of refrigerant
62 10 Decommissioning of the TRU
63 Annex A (informative)Specifications of control volumes for TRV
66 Annex B (informative)Description of mechanisms to reduce risk
B.1 General
B.2 Heat exchanger zoning concept
B.3 Indirect heat exchanger
67 B.4 Heat exchanger separation mechanism, shut-off devices
68 B.5 Ventilation mechanism
B.5.1 General
B.5.2 Outside ventilation mechanism
69 B.5.3 Inside ventilation mechanism
B.6 Refrigerant detection
70 B.7 Alarm system
B.7.1 General
B.7.2 Types of alarm
71 B.7.3 Visible and audible refrigerant leak alarm
B.7.4 Actions by the alarm system
72 Annex C (normative)Information on leak types and leak mass flow
74 Annex D (normative)Useful equations for the calculation of environment ventilation
D.1 General
D.2 Dilution of a flammable substance release with air
76 D.3 Additional examples
D.3.1 Small volume in open air situation
77 D.3.2 A Non-ventilated enclosure
78 Annex E (normative)Tracer gas measurement for determination of air exchange rate
E.1 General
79 E.2 Tracer gas measurement with CO2
80 E.3 Required air exchange rate for dilution of refrigerant releases inside the compartment volume
81 Annex F (informative)Typical ignition sources for risk assessment of TRU
82 Annex G (informative)Example process for risk evaluation

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BS EN 17893:2024
$215.11