Bottom Loading at the Perth Amboy Rack
You arrive at a Perth Amboy terminal to load 7,500 gallons of gasoline into a 9,000-gallon, four-compartment tanker. The terminal uses bottom loading with vapor recovery. The previous load was diesel, and the tank was drained but not washed. The loading rack's grounding cable clamp is broken; the rack attendant says 'just clamp it to the painted bumper, it works.' The trailer has a vapor recovery hose with a missing gasket. You are scheduled for a 30-minute slot, and the next load is premium gasoline. The terminal's loading arm has a slow drip at the swivel. You are tired, it is 2:00 a.m., and the attendant tells you to start loading while he finds a new clamp. The rack has no spare gasket in the cabinet.
1. Can loading begin? Address the ground clamp, vapor hose gasket, previous product, drip, and your fitness.
Read the worked answer
No. The ground clamp must contact clean bare metal on the tank shell, not a painted bumper. Paint insulates and can leave the tank ungrounded, allowing static to ignite gasoline vapor. A missing gasket in the vapor recovery hose means the system is not closed and vapor can escape at the rack. The previous diesel load was only drained, not washed, so premium gasoline may be contaminated and off-spec; the terminal must verify cleanliness and compatibility before loading. The dripping loading arm is a product release and a fire hazard; it must be repaired or taken out of service. Fatigue at 2:00 a.m. is another reason not to rush; you must be alert enough to attend the entire load. Do not begin until the rack fixes the clamp, hose gasket, and drip and confirms the tank is acceptable for gasoline.
2. Once the equipment is repaired, what sequence do you follow, and who must attend the load?
Read the worked answer
Park and set the parking brake, chock the wheels, verify compartment assignments and outage, and confirm the tank is clean and compatible. Connect the grounding cable first to bare metal, then the vapor recovery hose, then the loading arm. Confirm the emergency shutoff is accessible and tested. Open valves slowly, stay at the controls the entire time, watch compartment levels and vents, and stop at the planned outage limit. Do not smoke or use a phone near the dome. At shutdown, close product valves, drain the arm, disconnect the loading arm, then the vapor hose, then the ground. Report any drip, odor, or gauge problem immediately. The driver must attend the load; the rack attendant cannot substitute for your monitoring.
3. Is clamping to the painted bumper ever acceptable if the attendant says it has worked before?
Read the worked answer
No. Clamping to the painted bumper is a false ground. Static charge can build on the tank shell and hose, and a spark at the dome or vapor connection can ignite gasoline. The attendant's experience does not create a metal-to-metal path. Wait for the proper clamp, or ask the terminal to move you to a rack with working grounding. If the terminal refuses, refuse the load and document it. Starting the load while the attendant searches for a clamp means transferring gasoline without bonding and without full attention, which is exactly when a static ignition or spill is most likely.