FAQs
ZEVAC Overview
ZEVAC is an air-driven gas transfer system that captures excess natural gas pressure and compresses it into a designated receiving line or containment vessel.
Using compressed air as its power source, the system creates a pressure differential that safely evacuates gas from isolated pipeline sections without introducing air into the gas stream.
This process eliminates the need for atmospheric venting while maintaining operational control and system integrity.
Using ZEVAC instead of open-valve venting:
- Prevents emissions
- Preserves sellable product
- Reduces regulatory and environmental risk
- Improves jobsite and operator safety
- Supports ESG and sustainability goals
Evacuation time depends on:
- Pipeline length and diameter
- Initial line pressure
- Desired final pressure
- Available air compressor size (cfm)
- Pressure differential
Higher air flow rates and multiple stacked units can significantly reduce evacuation time. We can provide project-specific drawdown estimates upon request.
Additional protection includes:
PRV rated up to 1500 PSIG
Technician monitoring of gauges
Configurable OPCO settings
The system automatically shuts down if pressure exceeds the preset limit.
Technicians also actively monitor gauges throughout operation to maintain safe system pressures.
- Pressure Relief Valve (PRV)
- Over-Pressure Cut Off (OPCO)
- Under-Pressure Cut Off (UPCO)
- Bleed cavity vent between air and gas systems
- Manual gauge monitoring
ZEVAC Mini
The Mini is most commonly used for distribution pipelines, from 2-6 inches. It can also be used to drawdown traps for ILI inspection projects. It will operate on gas and any Y-grade liquid, butane, propane, NGL. As well as a mixture of both gas and liquid.
Using ZEVAC instead of open-valve venting:
- Prevents emissions
- Preserves sellable product
- Reduces regulatory and environmental risk
- Improves jobsite and operator safety
- Supports ESG and sustainability goals
The ZEVAC Mini is the most versatile and mobile unit in ZEVAC's equipment lineup, easily fitting in the bed of a truck or SUV. Fitted with wheels and weighing 185 lbs, the LP Mini can be lifted by two people and moved around a jobsite by one.
ZEVAC Twin
The ZEVAC Twin is typically deployed on distribution lines, spools, upstream and midstream assets, and for all trap applications. It is engineered to handle gas, any Y‑grade liquids (including butane, propane, and NGLs), and any mixture from 100% gas to 100% liquid.
The ZEVAC Mini is the most versatile and mobile unit in ZEVAC's equipment lineup, easily fitting in the bed of a truck or SUV. Fitted with wheels and weighing 185 lbs, the LP Mini can be lifted by two people and moved around a jobsite by one.