Free checklist
Thermal energy storage tank quarterly maintenance checklist
A quarterly thermal energy storage tank round is short on purpose: it catches the wear items that fail between annual services. This checklist is sized for a tech with a phone. Every item says what to look at and the photo that proves the round happened. Work is commonly verified against IMC (mechanical code), manufacturer's published instructions. Confirm the edition your authority having jurisdiction has adopted.
The checklist
Every item, and the photo evidence it needs
The photo count on each row is what RTI would require before the item can be submitted. Work the list here and watch the gate hold, or load it into RTI and let it enforce the real thing.
Insulation and shell
Tank insulation and vapor seal dry and intact
No sweating, dripping or wet spots on the jacket, vapor seal continuous at seams and penetrations, no corrosion staining running down the shell.
Tank supports and connections sound
Supports and anchors solid, no shifting or cracking at the base, piping connections dry with no weeping at flanges or unions.
Tank openings closed and secured, entry points signed
Hatches latched or locked and signed as confined spaces, or lids and fill caps closed on packaged tanks, gaskets seated. No entry is made on the quarterly round.
Level and temperature
Level and temperature readings agree with the plant controls
Local level and temperature match what the plant is reading, charge and discharge temperatures show a real spread, sensors not stuck or shorted.
Stratification sensors read at each height up the tank
On stratified chilled water tanks, sensors read top to bottom show a clear thermocline, with no reading out of step with the sensors above and below it.
No photoIce inventory display checked against the tank level
On ice storage, the inventory shown at the BAS agrees with the tank's level indicator or ice sensor for that point in the cycle, and the reading is moving, not stuck.
No photoGlycol concentration read with a refractometer
On glycol ice systems, the loop sample reads within the design concentration and is compared with last quarter's reading, with any loss noted.
No photoMakeup water use compared with last quarter's meter reading
Where the tank has metered makeup, use since the last visit in line with past quarters. A steady rise points to a leak or an overflow running.
No photo
Charge and discharge
Tank charges and discharges on its schedule
Tank observed charging off-peak and discharging on-peak per the sequence, isolation and changeover valves stroking to the right position, flow in the correct direction.
Recent charge and discharge trends reviewed at the BAS
Trends show each charge finishing before the on-peak window and discharge carrying the load the sequence plans for, end-of-charge temperature or inventory at design.
Charge flow held within the diffusers' design rate
On stratified tanks, charge and discharge flow at the BAS stays within the design rate for the diffusers, since excess flow mixes the thermocline away.
No photo
Water treatment and reporting
Tank water treatment test results reviewed in the log
Treatment readings since the last visit present and within the program's ranges, chemical added as scheduled, and any out-of-range result followed up.
No photoLeaks, sweating and sensor faults reported to the owner
Wet insulation, weeping connections, disagreeing sensors and missed charge cycles listed for the owner with location and the date first seen.
No photo
What usually sends this back
The failures are almost always the evidence, not the work
- Sweating and dripping at the insulation and vapor seal, so the tank loses capacity and rots its own jacket and the floor under it.
- Charge and discharge temperatures drift together, so the tank is cycling water without actually storing usable cooling.
- Level reading stuck or off, so the plant controls charge and discharge on a level that is no longer real.
Verified against
Common questions
6 answers
- What does this thermal energy storage tank quarterly checklist cover?
- 13 items across 4 sections, covering insulation and shell, level and temperature, charge and discharge, water treatment and reporting. Each item spells out what the person walking the job is actually looking for, not just a box to tick.
- Who should run this inspection?
- The HVAC or maintenance tech on the quarterly mechanical round.
- When in the schedule should this walk happen?
- Every quarter through the cooling season, walked with the chiller plant. A tank that stops shifting load quietly costs demand charges long before anyone notices.
- Why do these items ask for a photo?
- 6 of the 13 items call for photo evidence, 8 photos in all. A checklist answer without the photo is a claim; the photo is what makes the record worth something in a dispute and lets a reviewer approve work without re-walking the job.
- What most often fails a thermal energy storage tank quarterly inspection?
- Sweating and dripping at the insulation and vapor seal, so the tank loses capacity and rots its own jacket and the floor under it. Charge and discharge temperatures drift together, so the tank is cycling water without actually storing usable cooling. Level reading stuck or off, so the plant controls charge and discharge on a level that is no longer real.
- Can I use this checklist in RTI?
- Yes. Start a free RTI workspace, build this list as a checklist, and the Photo Gate holds the submit button until every mandatory item is answered and its photos are attached. Approved inspections roll into a branded turnover package with a tamper evident audit trail.
Run it with the Photo Gate
A checklist nobody can submit half-finished
Load this list into RTI, stick a QR tag on the area it covers, and the submit button stays locked until every mandatory item is answered and the 8 required photos exist. Approved walks roll into a branded turnover package with a tamper evident record behind every line.
See all 508 checklists · 6741 items and 5984 photo requirements in total.