|Question: 11-04||Code Section: 7||Date: 28 February 2011||
OBC 2006 Reference: 22.214.171.124.; 126.96.36.199.; 188.8.131.52.
Question Submitted: 184.108.40.206. Could the committee provide various methods of acceptable protection against
Interpretation: 220.127.116.11.(1) Protection against thermal expansion shall be required when a check valve is
required by Article 18.104.22.168., a backflow preventer is required by Article 22.214.171.124., or a pressure
reducing valve is required by Article 126.96.36.199.
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