CSA Group CSA G401:24 National Standard of Canada Corrugated steel pipe and buried structures

Preface

This is the sixth edition of CSA G401, Corrugated steel pipe and buried structures. It supersedes the previous editions published in 2014, 2007, 2001, 1993, and 1981 under the title Corrugated steel pipe products.

Changes have been made to this Standard to permit materials, manufacturing methods, and inspection procedures that meet appropriate, current, and projected industry practices. These changes include the following:

a) changed standard name to Corrugated steel pipe and buried structures;

b) removed spiral rib pipe Type II;

c) added profile structural plate Type III;

d) expanded tunnel liner plate to Types I and II;

e) added zinc flake coated bolts and nuts;

f) added alternative coating for structural plate and deep corrugated structural plate;

g) added clause for helical welded lockseam;

h) added requirements in Clause 6, Quality of work and repair;

i) rewrote Clause 8, Handling, transport, storage and repair;

j) removed Tables 10 and 11 for minimum outside circumference;

k) updated bolt tables to imperial dimensions only, as metric is not available; and

l) added Annex C (informative), Sustainability.

This Standard is considered suitable for use for conformity assessment within the stated scope of the Standard.

CSA Group acknowledges that the development of this Standard was made possible, in part, by the financial support of the Corrugated Steel Pipe Institute (CSPI). Such support does not indicate endorsement of the contents of this Standard.

This Standard was prepared by the Technical Committee on Corrugated Steel Pipe and Buried Structures, under the jurisdiction of the Strategic Steering Committee on Construction and Civil Infrastructure, and has been formally approved by the Technical Committee.

This Standard 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 Standard is stated in its Scope, it is important to note that it remains the responsibility of the users of the Standard to judge its suitability for their particular purpose.

3) This Standard 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 Standard.

4) To submit a request for interpretation of this Standard, 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 Standard 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) Standard 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

This Standard specifies material and fabrication requirements for corrugated steel pipe, spiral rib pipe, structural plate, and two-flange tunnel liner plate.

1.2

This Standard applies to corrugated steel pipe and buried structures for applications such as culverts, storm sewers, storm water management systems, subdrains, hydraulic structures, grade separations, and tunnels.

1.3

This Standard does not include requirements for hydraulic design, service life, structural design, construction, or installation. For the structural design of products less than 3.0 m in span, refer to ASTM A796. The structural design of corrugated steel pipe and buried structures greater than or equal to 3.0 m in span is included in CSA S6.

1.4

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.