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.
Like all ZEVAC equipment, the ZEVAC Mini can draw down pipelines to 0 psi. This removes any and all product, both liquids and gases, from the pipeline.
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.
ZEVAC Quad
The ZEVAC Quad is a versatile unit commonly used on distribution lines, spools, upstream and midstream systems, and all trap applications. It is designed to handle gas, any Y-grade liquid (including butane, propane, and NGL), and any gas–liquid mixture.
The ZEVAC Quad uses four individual cores, each requiring 90 cfm of air. For full-performance operation, we recommend a 375 cfm or larger air compressor.
The Quad is the largest unit in the ZEVAC lineup, yet it remains highly mobile and versatile. Operators typically transport and deploy the Quad using a flatbed truck or trailer, depending on project requirements and jobsite conditions.
Like all ZEVAC equipment, the ZEVAC Quad can draw down pipelines to 0 psi. This removes any and all product, both liquids and gases, from the pipeline.
ZEVAC ZD3
Unlike mobile ZEVAC Equipment, the ZD3 runs off differential pressure from high pressure gas sources on site instead of compressed air. This eliminates the need for an air compressor onsite and reduces the complexity of installation.
The ZEVAC ZD3 can be used to recapture emissions from actuators, unit blowdowns, rod packing, BTEX, yard equipment blowdowns, pig traps, and more.