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Expansion tank maintenance checklists

Expansion tank maintenance checklists for the quarterly and annual rounds: 2 free lists, 27 items and 16 photo requirements, each item naming what to look for and the photo evidence it needs.

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The expansion tank rounds

Expansion tank QuarterlyExpansion tank quarterly maintenance checklistWaterlogging, connection and corrosion checked quickly on the quarterly round14 items9 photosExpansion tank AnnualExpansion tank annual maintenance checklistPre-charge measured against system pressure with the tank isolated on the annual service13 items7 photos

Where each walk sits in the schedule

  1. 01quarterly

    Expansion tank quarterly maintenance checklist

    Every quarter, paired with the pump or water-heater check since a waterlogged tank shows up first as the relief valve weeping or the pump short-cycling.

    Run by: The plumbing or maintenance tech on the quarterly mechanical round.

  2. 02annual

    Expansion tank annual maintenance checklist

    Once a year, the only pass where the tank is actually isolated and gauged rather than judged by tapping, and re-charged to match the current system pressure.

    Run by: The plumbing service tech on the annual service, with the tank isolated and the water side relieved so the pre-charge can be read cold.

What most often fails on an expansion tank

  • Tank tapped, sounds full and is called good, when a full-sounding tank on the water side usually means the bladder is gone and it's waterlogged.
  • Relief valve dripping downstream is chased as a bad valve when the real cause is an expansion tank that can no longer take up expansion.
  • Tank hangs on its connection with no support, so the pipe stub carries the full water-filled weight and starts to crack at the fitting.
  • Pre-charge read with system pressure still on the tank, giving a meaningless number and leaving the tank set wrong for another year.
  • Tank re-charged to a generic figure instead of the actual system fill pressure at that tank's height, so it still can't take up expansion properly.

Common questions

4 answers

Which expansion tank maintenance rounds do these checklists cover?
Expansion tank quarterly maintenance checklist (quarterly): Every quarter, paired with the pump or water-heater check since a waterlogged tank shows up first as the relief valve weeping or the pump short-cycling. Expansion tank annual maintenance checklist (annual): Once a year, the only pass where the tank is actually isolated and gauged rather than judged by tapping, and re-charged to match the current system pressure.
Who runs the expansion tank maintenance round?
The plumbing or maintenance tech on the quarterly mechanical round. The plumbing service tech on the annual service, with the tank isolated and the water side relieved so the pre-charge can be read cold.
What most often fails on an expansion tank?
Tank tapped, sounds full and is called good, when a full-sounding tank on the water side usually means the bladder is gone and it's waterlogged. Relief valve dripping downstream is chased as a bad valve when the real cause is an expansion tank that can no longer take up expansion. Tank hangs on its connection with no support, so the pipe stub carries the full water-filled weight and starts to crack at the fitting. Pre-charge read with system pressure still on the tank, giving a meaningless number and leaving the tank set wrong for another year.
Can I run these checklists in RTI?
Yes. Start a free RTI workspace and load any of the 2 lists (27 items in total). The Photo Gate holds the submit button until every mandatory item is answered and its photos are attached, and approved inspections roll into a branded turnover package with a tamper evident audit trail.

Run these lists with the Photo Gate.

Tag one area, scan it, and the submit stays locked until the photos exist.

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