CSA Group CSA B108.1:23 National Standard of Canada Compressed natural gas refuelling stations installation code

Preface

This is the second edition of CSA B108.1, Compressed natural gas refuelling stations installation code. It supersedes the previous editions published in 2021 and 2018 as Part 1 of CSA B108, Natural gas refuelling stations installation code, and in 2014, 1999, and 1995 as CSA B108, Compressed natural gas fuelling stations installation code.

CSA B108.1 is applicable to compressed natural gas (CNG) refuelling stations. CSA B108.2 is applicable to liquefied natural gas (LNG) refuelling stations, including LNG to CNG conversion systems. CSA B108.2 supersedes Annex D of CSA Z276, Liquefied natural gas (LN) — Production, storage, and handling.

The following are the major changes to this edition:

a) expansion of Scope to include CNG bulk transport filling and decanting stations;

b) clarification of the terms “VRA”, “VFA”, and “RFA” to address new standard terminology and legacy equipment, and the addition of new terms that address all three appliance types (i.e., refuelling appliances);

c) significant changes to electrical classified zones based on IEC 60079-10-1:2020, and to ventilation rates and more detailed definitions of wall types;

d) clarifications between electrical classified zones and fire setbacks, and the use of walls within these areas;

e) clarification of the setbacks and electrical classification regarding relief device and blowdown vent points;

f) expanded requirements for piping installation to conform with practices described in CSA B149.1;

g) addition of Annex A on operation, maintenance, and personnel training;

h) editorial revisions to

i) clarify wording and references, tables, and figures;

ii) resolve conflicts identified with other documents;

iii) provide consistency and clarification between this Code and CSA B108.2;

iv) correct metrication values; and

v) harmonize definitions with other industry codes and standards;

i) reorganization and revisions of content for consistency of organization between this Code and

CSA B108.2; and

j) clarification of definitions and requirements.

CSA Group acknowledges that the development of this Code was made possible, in part, by the financial support of Natural Resources Canada.

This Code was prepared by the Subcommittee on Natural Gas for Vehicle Refuelling Stations Installation Code, under the jurisdiction of the Technical Committee on Natural Gas Transportation and the Strategic Steering Committee on Transportation, and has been formally approved by the Technical Committee.

This Code has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group.

Notes:

1) Use of the singular does not exclude the plural (and vice versa) when the sense allows.

2) Although the intended primary application of this Code is stated in its Scope, it is important to note that it remains the responsibility of the users of the Code to judge its suitability for their particular purpose.

3) This Code was developed by consensus, which is defined by CSA Policy governing standardization — Code of good practice for standardization as “substantial agreement. Consensus implies much more than a simple majority, but not necessarily unanimity”. It is consistent with this definition that a member may be included in the Technical Committee list and yet not be in full agreement with all clauses of this Code.

4) To submit a request for interpretation of this Code, please send the following information to [email protected] and include “Request for interpretation” in the subject line:

a) define the problem, making reference to the specific clause, and, where appropriate, include an illustrative sketch;

b) provide an explanation of circumstances surrounding the actual field condition; and

c) where possible, phrase the request in such a way that a specific “yes” or “no” answer will address the issue.

Committee interpretations are processed in accordance with the CSA Directives and guidelines governing standardization and are available on the Current Standards Activities page at standardsactivities.csagroup.org.

5) This Code is subject to review within five years from the date of publication. Suggestions for its improvement will be referred to the appropriate committee. To submit a proposal for change, please send the following information to [email protected] and include “Proposal for change” in the subject line:

a) Code designation (number);

b) relevant clause, table, and/or figure number;

c) wording of the proposed change; and

d) rationale for the change.

1 Scope

1.1 Inclusions

This Code applies to

a) the design, location, construction, operation, operator training, and maintenance of CNG vehicle refuelling stations; and

b) CNG bulk transport filling and decanting stations, including

i) those that are fixed or mobile and intended for private or public dispensing operations; and

ii) bulk transport filling and decanting stations that feed CNG pressure reduction stations or other non-vehicle uses.

1.2 Exclusions

This Code does not apply to

a) refuelling vehicles with liquefied natural gas (LNG), which is covered by CSA B108.2. However, when an LNG facility has capacity for CNG vehicle refuelling from a liquid to compressed natural gas system (L/CNG system), this Code applies to facilities downstream of the L/CNG system odourizer’s outlet isolation valve;

b) transfer of CNG from the CNG vehicle fuel storage system of one vehicle to the CNG vehicle fuel storage system of another vehicle;

c) listed residential fuelling appliances (RFAs), listed non-residential vehicle fuelling appliances (VFAs), and listed vehicle refuelling appliances (VRAs), except where

i) the aggregate flow capacity of a connected refuelling appliance (RA), or a combination of refuelling appliances thereof, exceeds 0.850 Sm3/min (30 SCFM); or

ii) the RA is connected to storage, in which case coverage applies to the storage and dispensing system starting at the outlet of the individual RA (see Figure D.1); and

d) mobile equipment containing compressed natural gas, such as MRUGs, PRUGs, and bulk containers in the act of being transported or offered for transport in accordance with Transport Canada’s Transportation of Dangerous Goods Act and Regulations.

1.3 Pressure terminology

Unless otherwise specified, all references to pressure throughout this Code are to be considered gauge pressures.

1.4 Terminology

In this Code, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Code; “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 Code.

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.

1.5 Use of SI units

The values given in SI units are the units of record for the purposes of this Code. The values given in parentheses are for information and comparison only.

Notes:

1) IEEE/ASTM SI 10 or ISO 80000-1 can be used as a guide when converting U.S. customary units to SI units.

2) Where the abbreviation “gal” is used in this Code, it indicates a U.S. gallon equivalent to 3.785 L water capacity.

3) This Code was originally developed using the U.S. customary system of measurement and subsequently converted to SI units having three significant digits. Every attempt has been made to provide accurate conversion values; however, when designing systems using these values, engineering judgment should be applied.