Battery · Surface Facilities
LACT Unit
Lease automatic custody transfer: metering equipment that measures the volume and quality of crude oil as it changes ownership.
What it does
Payment depends on its numbers, so accuracy matters to both sides. A sediment and water monitor sends off spec oil back through a three way divert valve, a sampler paced by the meter takes a common sample, and the meter is proved to keep its meter factor right.
Basics
| Meter | Coriolis on most new units |
| Also has | Sampler, S&W monitor, divert valve, air eliminator, proving manifold |
| Accuracy | Meter proving and meter factor |
Common failures
- Meter not proved, so the meter factor and every sale are off
Troubleshooting
- Symptom
- Sales volume does not match the tank figures
- Likely cause
- Meter factor out of date or air in the line
- What to check
- Prove the meter and check the air eliminator