Inert gas is used for blanketing and purging of chemical tanks, and for purging of equipment and systems before maintenance.
The inert gas system can be divided into three sub-systems:
- Nitrogen generator/source
- Storage system
- Distribution system
TYPICAL OPERATING/DESIGN CONDITIONS
Typical supply pressure is 6-9 barg when using plant air feed.
Typical design and operating criteria for the main equipment:
- Feed air pressure 6-10 barg
- Feed air temperature 30-50 °C
- Feed air particle size 3 micro meter
- Feed air dew point (at 10 bar) -25 °C
- Oil free feed air Less than 0,01 mg/m3
- Design pressure 8-13.5 barg
- Design temperature, min/max -10/60°C
Nitrogen is used extensivley for drilling, completion and workover of oil and gas wells, also for pressure meintenance and gas storage in condensate formations.
It can be generated on site at high pressures and low oxygen levels to safely prevent ignition of flammable gases or protection of field tubulars from downhole corrosion.
- Produced water flash drum
- Compressor gas seals
- Produced water disposal caisson
- Heating medium expansion vessel
- Methanol storage tank
- Low pressure flare header
- Atmospheric vent header
- Hazardous open drain sump
- Closed drain flash drum
- Reclaimed oil sump
- Heave compensation