Standard for Metallic and Nonmetallic Underground Piping for Flammable and Combustible Liquids

Designation Number:
CAN/ULC-S679
Standard Type:
National Standard of Canada - Domestic
Standard Development Activity:
Amendment Revision
ICS code(s):
23.040.40
Status:
Proceeding to development
SDO Comment Period Start Date:
SDO Comment Period End Date:
Posted On:

Scope:

1.1 This Standard sets forth minimum requirements for primary carrier, secondary containment, integral primary/secondary, normal vent and vapour recovery, metallic, composite and nonmetallic pipe, fittings, and systems (products) intended for use underground for the distribution and venting applications of petroleum-based flammable and combustible liquids, alcohols, and alcohol-blended fuels as identified in this document.


1.2 For the purpose of this Standard, flammable and combustible liquids mean gasoline, fuel oil, kerosene and diesel fuel, including gasoline with small amounts of additives such as detergents, solvents for detergents and anti-icing chemicals; diesel with up to 5 % biodiesel and gasoline with up to 15 % ethanol.


1.3 This Standard covers metallic, composite and nonmetallic thermoplastic (flexible) and thermoset (rigid) plastic piping with manufacturer-supplied fittings for underground use only. The products covered by this Standard have been evaluated for assembly in normal soil applications by qualified persons in accordance with the manufacturer's instructions.


1.4 The products covered by this Standard have not been evaluated for applications in sumps [more than 305 mm (12 in) inside a sump wall], as connector pipe (between underground pipe and dispensing device), aboveground or marine use, or other applications exceeding normal temperatures.


1.5 Products covered by this Standard are intended to be installed and used in accordance with, but not limited to, any of the following documents:

A     National Fire Code of Canada, Part 4; and

B     CCME PN 1326, Environmental Code of Practice for Aboveground and Underground Storage Tank Systems Containing Petroleum and Allied Petroleum Products.

Project need:

UL/ULC FUS & CAS Engineers have received feedback from both metallic and nonmetallic underground pipe manufacturers that the factory production tests as currently written in the UL971, UL971A & ULC-S679 Standards don’t recognize advanced technology and factory production quality controls to ensure “no leakage”, and are overly onerous or cannot be performed because of: a) Compliance uncertainty due to PV=nRT test variables associated with pressurized thin walled flexible pipes, and, b) Potential damage to pipe ends (threaded types) or inability to sell them afterwards (crimp & fused/bonded fittings). As a result, we have learned some FUS Procedures may have been revised through the VN process to permit alternate production methods, including new technology and QC programs that were judged as equivalent means to determine “no leakage”. Therefore, the above Standards must be revised to permit equivalent alternate means to reasonably ensure pipe and fittings do not have production defects which could result in leakage.

Note: The information provided above was obtained by the Standards Council of Canada (SCC) and is provided as part of a centralized, transparent notification system for new standards development. The system allows SCC-accredited Standards Development Organizations (SDOs), and members of the public, to be informed of new work in Canadian standards development, and allows SCC-accredited SDOs to identify and resolve potential duplication of standards and effort.

Individual SDOs are responsible for the content and accuracy of the information presented here. The text is presented in the language in which it was provided to SCC.