CAN/CSA/ANSI LNG 4.1-2018
Liquefied natural gas (LNG) dispensing systems for natural gas vehicles (NGV)
This Standard applies to:
the mechanical and electrical features of newly manufactured stationary and mobile systems that dispense “cold” or “warm” liquefied natural gas for vehicles where such a system is intended primarily to dispense the fuel directly into the fuel storage container of the vehicle;
LNG dispensers contained in a single housing; and
LNG dispensers contained in multiple housings for metering and registering devices, remote electronics, overfill protection, hoses, and fuelling nozzles.
Each dispenser may have the capability of independently fuelling more than one vehicle simultaneously.
Dispensers covered by this Standard are intended for use with liquefied natural gas, a fluid in the liquid state at cryogenic temperatures that is composed predominantly of methane and that can contain minor quantities of ethane, propane, nitrogen, or other components normally found in natural gas.
This Standard does not apply to:
rail locomotive dispensing systems;
marine vessel bunkering systems;
compressed natural gas dispensers;
fuel management systems or point of sales systems; and
remote sequencing equipment and other remote equipment not supplied as part of the dispenser.
Installation of an LNG dispenser is intended to be in accordance with NFPA 52, or CSA B108, Part 2, as applicable, and the requirements of the authority having jurisdiction (AHJ).
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 (nonmandatory) to define their application.
All dimensions used in this Standard are in metric units [International System of Units (SI)], unless otherwise specified. If a value for a measurement, as given in this Standard, is followed by an equivalent value in other units, the first stated is to be regarded as the specification.
All references to pressure throughout this document are to be considered gauge pressures unless otherwise specified.
Annex A contains Clauses that are unique to Canada.