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Preface
This is Supplement No. 1 to the sixth edition of CSA Z341 Series, Storage of hydrocarbons in underground formations.
A single comprehensive Canadian standard does not currently exist to provide guidance on the design of these types of facilities specific to the needs of Canada. The purpose of this Supplement is to fulfill an immediate need for supplemental design guidance pertaining to hydrogen and hydrogen blend underground storage facilities.
CSA Z341 Series:22, Storage of hydrocarbons in underground formations, sets out essential requirements and minimum standards for the design, construction, operation, maintenance, abandonment, and safety of underground storage systems.
This Supplement recognizes the need for a comprehensive performance-based approach to storage facility design and layout for hydrogen and hydrogen blend products and therefore is intended to be used as a supplement to the requirements contained in the CSA Z341 Series.
CSA Group acknowledges that the development of this Standard was made possible, in part, by the financial support of Natural Resources Canada.
This Supplement was prepared by the Task Force on Hydrogen and Hydrogen-Hydrocarbon Blends Storage, under the jurisdiction of the Technical Committee on Storage in Underground Formations and the Strategic Steering Committee on Petroleum and Natural Gas Industry Systems, and has been formally approved by the Technical Committee.
S1-1 Scope
[Replace this Clause with the following]
S1-1.1 Applicability
This Supplement sets out minimum requirements for the design, construction, operation, maintenance, abandonment, and safety storage of hydrogen and hydrogen blends in underground formations and associated equipment. The equipment considered includes
a) storage wellhead and Christmas tree assemblies;
b) wells and subsurface equipment; and
c) safety equipment, including monitoring, control, and emergency shutdown systems.
This Supplement is to be used concurrently with CSA Z341.1 and CSA Z341.2. Unless otherwise specified, all references to hydrocarbons or stored fluids in CSA Z341.1 and CSA Z341.2 mean hydrogen or hydrogen blend. Where no changes are identified in this Supplement, CSA Z341.1 and CSA Z341.2 apply.
This Supplement has been designed to complement provincial and/or federal regulatory frameworks and does not mandate regulatory requirements unless referenced in provincial and/or federal regulations. This Supplement provides advisory guidance that can be followed to demonstrate compliance with local and national codes and regulations and industry best practices. Alternative design codes and standards that are not specified in this Supplement may be used, provided that pertinent local and national regulations are satisfied and that it can be demonstrated that the design meets industry best practices.
There is no established safe percentage of hydrogen that can be blended in an underground storage system without first evaluating, including, but not limited to, existing defects, partial pressure, metallurgy and microstructure, pressure cycling, and percentage of specified minimum yield strength (SMYS) on the wellbore materials and evaluating the reactivity impacts with the storage formation. Where the evaluation of these parameters indicates there is minimal risk from hydrogen, then CSA Z341.1 and CSA Z341.2 apply.
This Supplement sets out minimum requirements for the design, materials, and well completion on existing installations and installations under construction at the time of publication. The requirements apply to the testing, operation, extension, conversion, maintenance, and upgrading of such installations.
S1-1.2 Scope diagram
The scope of this Supplement for reservoir storage of hydrogen and hydrogen blends is shown in Figure 1 of CSA Z341.1. The scope of this Supplement for salt cavern storage of hydrogen and hydrogen blends is shown in Figure 1 of CSA Z341.2.
S1-1.3 Exclusions
This Supplement does not apply to
a) ammonia;
b) methanol;
c) in-situ production of hydrogen; and
d) items in Clause 1.3 in CSA Z341.1 and CSA Z341.2.
S1-1.4 Limitations
It is not the intent of this Supplement to prevent the development of new equipment or practices, nor to prescribe how such innovations are to be handled.
Where the requirements of this Supplement differ from the requirements of other standards or codes referenced herein, the requirements of this Supplement take precedence as it was developed specifically for storage of hydrogen and hydrogen blends.
S1-1.5 Terminology
In this Supplement, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Supplement; “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 Supplement.
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.
