ZD3 Technology

Installed Vent Gas Recovery System

One ZD3 closed-vent system eliminates emissions from rod packings, unit blowdowns, exhaust from gas pneumatic actuators, filter unit blowdowns, pig trap blowdowns, and more.

The ZEVAC ZD3 is a closed-vent methane mitigation system designed to capture vented natural gas from compressor stations and other gas infrastructure and return it back into the pipeline. Instead of allowing gas to be released during routine operations, the ZD3 captures vent streams and recompresses them into the system, preventing emissions while preserving valuable product.

Like all ZEVAC equipment, the QUAD is 100% mechanically driven with no onboard electronics, making it the safest emissions reduction equipment available for live gas operations. Still portable enough to be transported on a flatbed or trailer, the QUAD is the ultimate combination of form, fit, and function.

How It Works

1
Pressure Differential Powers the System
High-pressure gas from the station’s discharge header expands toward the lower-pressure suction header. This pressure differential provides the energy required to operate the ZD3.
2
Vent Streams Are Routed to the ZD3
Vent lines from pneumatic controllers, valve actuators, compressor components, and other station equipment are connected to the system intake.
3
Vent Gas Is Captured and Drawn Down
The ZD3 detects pressure in the vent system and initiates a drawdown process that rapidly captures vented gas.
4
Gas Is Returned to the Pipeline
Recovered gas is compressed back into the station suction header, eliminating atmospheric release and retaining product within the pipeline system.

Ideal Applications

The ZD3 can capture emissions from a wide variety of vent sources across compressor stations and pipeline facilities, including:

  • Pneumatic valve actuators

  • Pneumatic controllers

  • Compressor rod packing vents

  • Unit blowdowns

  • Filter separator blowdowns

  • Pig launcher and receiver blowdown

  • General station vent systems

Because the ZD3 can manage vent streams across an entire facility, it provides a scalable solution for both small stations and large multi-unit compressor sites.

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Meet Compliance
Cross compression keeps gas fro
Reduce Risk
By keeping gas in the pipes, risks related to venting and flaring are completely eliminated
Easy Integration
ZEVAC equipment easily connects to gas lines and pipes, allowing for quick setup and operation.
No Electricity Required
Driven by compressed air, ZEVAC equipment requires no electricity to operate.
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Facility Methane Venting Recovery-1-1

Frequently Asked Questions

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How does ZEVAC work?

ZEVAC moves gas/liquids through cross-compression, from one pressurized system to another, through a set of intake and discharge hose connections. Trapped gas/liquids or contents, which would normally be vented or escape during repairs, are drawn into the ZEVAC and transferred into a nearby operational piping system or containment, resulting in zero emissions escaping into the atmosphere. 

What powers the ZEVAC?

The ZEVAC is powered pneumatically by connecting a compressed air source (generally an air compressor) to its air intake location. Any compressed air source can power the ZEVAC; the more air it receives, the faster the job gets done. 

Can ZEVAC handle liquids?
The ZEVAC is a positive displacement linear compressor. This means there is no spinning crankshaft or rotating drivetrain, which affords the ZEVAC equipment unique functionality and advantages, such as the capability to capture and recover product contents from 100% dry gas; to any percentage of wet gas mixtures; and even up to 100% liquid service.
Why use a ZEVAC?

Here's what ZEVAC cross compression delivers:

  • Regulatory compliance — Supports OOOOb/c and EPA methane mitigation requirements, helping you stay ahead of evolving regulations.

  • Enhanced crew safety — Keeps product inside the pipeline, significantly reducing ignition risk and exposure hazards for your team and surrounding community.

  • Zero product loss — Recovered gas stays in your system, eliminating waste and protecting revenue.

  • Environmental stewardship — Eliminates routine venting and flaring, reducing methane emissions and advancing your ESG and net-zero goals.

What is cross compression?
Cross compression is the process of vacuuming natural gas out of a pipeline section that needs to be depressurized and recompressing it back into another section of the system, keeping product in the pipe instead of releasing it into the atmosphere. ZEVAC's patented, portable cross-compression equipment is the only proven solution on the market capable of handling everything from 100% dry gas to 100% liquid contents, making it the industry's most versatile gas and liquid capture and recovery technology
What are the safety features?

ZEVAC safety features includes:

  • 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

These redundancies protect both personnel and pipeline integrity.

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Ready to get started?

Talk with a ZEVAC Rep and start your journey to zero emissions.