Fuel oil storage and day tank annual maintenance checklist

Owner told the standby fuel supply will be out of service

Owner and facility staff given the window when the transfer pump, filters and generator fuel path are down, with a plan if the set is called during it.

Spill plan and tank records on file

The owner's spill prevention plan, tank registration and prior inspection and leak test records on file and current for this tank, gaps raised with the owner.

Fuel sampled and polished where fitted

Sample pulled from the tank bottom; polishing loop run where installed, filter differential and water separator output observed until the return runs clear.

Water bottom fully drawn down

Water and sediment drained from the low point until clean fuel pulls, volume noted so a heavy bottom moves the next service interval.

Level gauge checked against a manual stick reading

Stick reading converted with the tank's own chart and compared to the gauge and any console reading, difference recorded and the gauge set or flagged.

Fuel pumps and generator start locked out before filters open

Transfer and polishing pumps locked and tagged, and the generator held out of auto with its starting circuit locked per the site's procedure while any filter it draws through is open.

Primary and secondary filters replaced

Elements changed, old media cut or inspected for water and growth, housings sealed and air bled so the suction primes.

Supply and return piping and valves checked

Full supply and return run walked for weeps, chafing and loose supports; isolation and anti-siphon valves confirmed in the correct position after service.

Cathodic protection tested where fitted

Where the tank has cathodic protection, a qualified corrosion tester takes the readings, rectifier output recorded and the results filed with the owner.

Housings sealed and locks removed before the load run

Filter housings sealed and bled, tools and people clear, locks removed by whoever hung them, and the generator put back in auto before the load run.

Leak sensors function tested by the manufacturer's method

Interstitial, sump and containment sensors lifted or dipped as the manufacturer directs, alarm seen at the console, anyone it reports to told before and after.

Overfill device actuated, not just the test button

People at the fill and anyone the alarm reports to warned first, then the high-level probe or float raised to trip it, any overfill valve or ball float inspected, all reset and the fill resealed.

Vent and fill path proven open

Vent run and screen confirmed clear so the tank breathes on draw-down, fill and gauge lines free, no vacuum building as level drops.

Day tank sustained through a load run

Generator run under load long enough to cycle the transfer pump repeatedly; day tank holds level, return returns, no starvation or overflow across the run.

Transfer controls back in auto and alarms clear

Pump controls in auto, leak monitor and overfill alarms clear, fill and gauge caps secured, and the owner told the fuel system is back in service.