Outlet · Gas Plant
Residue Gas Specification
The quality limits the processed gas must meet to enter the transmission pipeline: H2S, CO2, water, heating value and no free liquids.
What it does
Every unit in the plant exists to meet this specification. Each pipeline company sets its own tariff limits, so the numbers here are typical ranges, not the rule of a specific pipeline.
Basics
| H2S | About 0.25 to 0.3 grain/100 scf (6 to 7 mg/m3) |
| CO2 | About 2 to 3 mol % max |
| Water | About 4 to 7 lb/MMscf (60 to 110 mg/m3) |
| Heating value | About 950 to 1,150 Btu/scf |
| Liquids | None at delivery conditions |
Common failures
- Off spec gas that the pipeline refuses or shuts in
Troubleshooting
- Symptom
- Pipeline shuts in the plant outlet
- Likely cause
- One quality parameter out of limit
- What to check
- Find which analyzer tripped and trace it back to the treating or dehydration unit