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PEI IMA Grade 9 study materials
PEI IMA Grade 9 study resources

PEI IMA Grade 9: Fuel Storage and Dispensing Systems

PEI IMA Grade 9 · Work through your exam, one topic at a time.

All guide sections

Fuel Storage and Dispensing Systems

Fuel Storage and Dispensing Systems (Domain 2) covers the path fuel takes from the delivery truck to the nozzle: fill and vent components, overfill and spill protection, the pump and piping arrangement, and the safety devices inside a dispenser. Questions mix component identification with operating limits and failure symptoms.

Fill, vent and tank hardware

  • Fill pipe → spill bucket → drop tube. The drop tube ends within about 6 in of the tank bottom to limit static generation and product splash.
  • Spill buckets must hold the product left in the delivery hose after disconnect and must drain to the tank through a working drain valve.
  • Overfill prevention is either a ball-float valve that restricts flow near the top of the tank or an electronic system that alarms and shuts down; ATG high-level alarms are the electronic backstop, not a substitute.
  • The vent pipe terminates outside, above flood level and away from openings and air intakes, sized for the fill rate.
  • The tank top carries the manway, ATG probe, interstitial monitor and STP sump; each penetration is a potential release point.

Dispensing path

  • Inlet shear (impact) valve with a thermal link closes on impact or fire.
  • Submersible pump in the sump, check valve, line leak detector, dispenser filter, meter, pulser, breakaway, hose, nozzle.
  • Pressure systems rely on the STP and its bypass; suction systems rely on a tank-mounted check valve and are limited by lift height and run length.
  • Stage II vapor recovery must match the site and coexist with ORVR vehicles; E85 and high-biodiesel blends need compatible seals, hoses and tank linings.

Worked example

A 10,000 gal tank reads 80% on the ATG. Ullage to the 90% high alarm = (0.90 − 0.80) × 10,000 = 1,000 gal. A driver plans a 2,500 gal drop. The order must not proceed as written: 2,500 > 1,000, so the driver must reduce or split the drop. The overfill valve closing near 95% is the last line of defense, never the plan.

Traps

  • Treating the overfill valve as a tank gauge.
  • Diagnosing a dead dispenser as an STP failure when the line leak detector has tripped.
  • Assuming every site is pressure-dispensing; suction lift limits change the answer.
  • Ignoring product compatibility when the site switches to higher ethanol or biodiesel blends.