2.6.1.7.(6)

Intent 1:

To limit the probability that:

• the lack of relief valves will lead to an inability to vent excessively high-temperature water, or
• the inappropriate location of relief valves will lead to an inability to sense the highest temperature of water in tanks, which could lead to the failure of temperature relief valves to vent excessively high-temperature water.

This is to limit the probability of water exceeding 99°C under all operating conditions, which could lead to the formation of steam, which could lead to pressure in hot water tanks exceeding the tanks' rated working pressure, which could lead to storage tank rupture, or steam in water distribution systems, which could lead to exposure to pressurized steam, which could lead to harm to persons.