Drip Blowing Gas Loss Calculator
Calculates gas volume vented during drip pot blowdowns for emissions reporting and loss accounting. Uses thermodynamic principles per EPA Subpart W methodology.
Calculation Method:
Operating Conditions
psig
°F
air = 1.0
Drip Pot & Blowdown
bbl
bbl
events
Field Blow Count Data
blows
Blows while liquid is discharging
blows
Blows after liquid is cleared (gas only)
gallons
Optional: Adjust Factors
psig
Adjusts loss factors for pressure
📚 Learn the Theory
Comprehensive coverage of drip pot sizing, blowdown procedures, condensate handling, and safety protocols.
Uses real gas law (P×V = ZnRT) to calculate gas at standard conditions. Accounts for compressibility via the Hall-Yarborough correlation.
Dissolved Gas Factor
Base: 1.05 scf per gallon at 100 psig Scaling: Increases with pressure per Henry's Law (~GOR relationship)
Methane Content
Assumption: 85% methane by volume (typical pipeline gas) GWP: 28 (IPCC AR5 100-year value for CO₂e)
Reference: EPA 40 CFR 98 Subpart W - Petroleum and Natural Gas Systems; API Compendium of GHG Emissions Methodologies for the Natural Gas Industry.
✓ Operational Best Practices
📅 Regular Schedule
Establish routine drip blowing intervals based on liquid accumulation rates to prevent over-filling and minimize emergency venting
🎯 Minimize Dry Blows
Optimize blow timing and valve operation to reduce unnecessary dry blows, as they contribute 5x more gas loss than wet blows
📊 Track & Report
Maintain accurate records of blow counts and volumes for regulatory compliance and loss accounting
♻️ Consider Recovery
For high-volume operations, evaluate closed-loop recovery systems or vapor recovery units to capture vented gas
⚙️ Common Applications
• Pipeline Drip Legs: Low-point condensate collection in transmission lines • Compressor Stations: Scrubber and separator drains • Meter Stations: Filter separator liquid removal • Gathering Systems: Production well site drips and traps • Gas Plants: Inlet separation and knockouts • Commissioning: Hydrotest water and construction debris removal
⚠️ Safety Reminder: Always follow company procedures, wear appropriate PPE, and ensure proper venting to safe locations away from ignition sources.