|Question: 11-04||Code Section: 7||Date: 28 February 2011||OBC 2006 Reference: 184.108.40.206.; 220.127.116.11.; 18.104.22.168.|
Question Submitted: 22.214.171.124. Could the committee provide various methods of acceptable protection against
Interpretation: 126.96.36.199.(1) Protection against thermal expansion shall be required when a check valve is
required by Article 188.8.131.52., a backflow preventer is required by Article 184.108.40.206., or a pressure
reducing valve is required by Article 220.127.116.11.
Suitable protection can be achieved by;
a) the installation of an adequately sized diaphragm expansion tank designed for use
within a potable water system,
b) the installation of a thermal expansion relief valve conforming to CAN/CSA-B125.3 (ie.
the only approved T.E.R. Valve presently is used as a shut off valve on the cold supply
to a hot water tank and must be set to a pressure of 550 kPa or less and designed for