CSA ANSI IAS NGV 4.4-1999 pdf download BREAmWAY DEVICES FOR NATURAL GAS DISPENSING HOSES AND SYSTEMS
1 Scope
1.1 Inclusions This Standard applies to newly produced compressed natural gas vehicle (NGV) dispenser fuelling hose emergency main line breakaway devices and vent line breakaway devices, herein to be referred to as devices.
1.2 Main line breakaway inclusions Main line breakaway devices covered by this Standard are intended to a) minimize the escape of natural gas by automatically shutting off the flow of gas from the dispenser and control the depressurization of the downstream hose; and b) separate the fuelling hoses attached to the vehicle from the dispenser during an unintended drive- off event.
1.3 Vent line breakaway inclusions Vent line breakaway devices covered by this Standard are intended to separate the vent line hose attached to the vehicle from the dispenser during an unintended drive-off event.
1.4 Exclusions The Standard is not applicable to home or private use vehicle refuelling appliances. 1.5 Pressure references All references to pressure throughout this Standard are to be considered gauge pressures unless otherwise specified.
1.6 Terminology
In this Standard, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Standard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the Standard.
Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.
Notes to tables and figures are considered part of the table or figure and may be written as requirements.
Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.
1.7 Units of measure
The values given in SI units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only.
2 Reference publications
This Standard refers to the following publications, and where such reference is made, it shall be to the edition listed below, including all amendments published thereto.
CSA Group
B108:18
Natural gas refuelling stations installation code
C22.2 No. 0.15:15 (R2020)
Adhesive labels
ASME (American Society of Mechanical Engineers)
B1.20.1-2013 (R2018)
Pipe Threads, General Purpose, Inch
ASTM International
B117-19
Standard Practice for Operating Salt Spray (Fog) Apparatus
D471-16a
Standard Test Method for Rubber Property — Effect of Liquids
D1149-2018
Standard Test Methods for Rubber Deterioration — Cracking in an Ozone Controlled Environment
ISA (International Society of Automation)
ANSI/ISA-75.02.01-2008 (IEC 60534-2-3 Mod)
Control Valve Capacity Test Procedures
ISO (International Organization for Standardization)
228-1:2000
Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions, tolerances and designation
1179-1:2013
Connections for general use and fluid power — Ports and stud ends with ISO 228-1 threads with elastomeric or metal-to-metal sealing — Part 1: Threaded ports
1431-1:2012
Rubber, vulcanized or thermoplastic — Resistance to ozone cracking — Part 1: Static and dynamic strain testing

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