I have a heat exchanger in a water loop fed from a storage tank to a pump where it is circulated through the tube side of an exchanger and back to the pump suction (drops from the loop to users as-required). The exchanger shell side has steam to heat the water. Although the water valves at the exchanger are locked open, there are valves at the pump suction and pump discharge that are not locked open, and if closed, could block the cold side of the exchanger. Since this is a long loop, is a thermal relief valve in the loop required?
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