Liquids · Distribution
Truck Loading Rack
The covered lanes at a terminal where tank trucks are filled from below through dry break couplers, with their vapors captured.
What it does
Each compartment is bottom loaded through a 4 in API adapter. A vapor hose sends displaced vapors to a vapor recovery unit, usually activated carbon, or to a combustor. A rack monitor wired to the overfill sensors in every compartment stops the pump if a top sensor gets wet.
Basics
| Loading | Bottom loading, API RP 1004 couplers |
| Adapter size | 4 in |
| Vapors | Carbon adsorption unit or combustor |
| Overfill | Electronic sensors per compartment, rack monitor |
Common failures
- Overfill because the meter preset or a sensor failed
Troubleshooting
- Symptom
- Rack monitor will not permit loading
- Likely cause
- Bottom sensor wet or ground not proven
- What to check
- Drain the compartment or check the grounding clamp and cable; never bypass the monitor