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Discharge Tube
A discharge tube is a tube or pipe that is attached to the TPR valve
that directs the superheated water down to the floor and away from anyone
in the discharge area to prevent scalding or burning.
The pipe itself must be made of a material that is rated for both high
temperature and pressure, which includes most rigid wall copper or iron.
Also, the size of the pipe must match the opening size of the TPR
valve discharge (usually ¾ inch).
The drain/drip tube must extend to
within 6" to 12" of a flush type floor drain. With bowl type floor
drains the drain/drip tube can over hang the side of the floor
drain. An air gap must be maintained
between the end of the drain/drip line and the floor drain to
prevent backflow. Thus, any hot water escaping from the TPR relief
valve will be directed safely into the floor drain.
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