Plumbing · P-A2WPR

Expansion Tank Detail

Materials

Elements

Insulation Drainage Anchors / Embeds Reinforcing

About this detail

An expansion tank connects to the domestic hot water system upstream of the air separator and ties into the domestic cold water line from the backflow assembly. A three-quarter-inch hose end drain valve sits at the base of the tank, while seismic straps secure the tank body per manufacturer specifications. Piping includes an isolation valve locked open, a charging valve set to scheduled pressure, a pressure-temperature port, a zero to one-hundred PSI pressure gauge, and a relief valve piped to the drain with pressure set per schedule. The domestic cold water feed sets pressure a minimum of one PSI above the tank minimum pressure. Tanks are ASME rated and NSF-61 approved for potable water, with anchors obtained per structural details during construction and insulation installed per schedule.

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