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Drawdown Compressor

PRODUCT: Portable Emissions Recovery

DDC-125: Eliminate Emissions During Gas Distribution Operations

During routine gas utility operations, maintenance and construction activity, natural gas is often stranded in a section of pipe. ULC Technology’s patent-pending DDC-125 Drawdown Compressor enables gas utilities to extract the stranded natural gas from the isolated section of main, compress it, and inject it back into the active system to support zero emissions goals and mitigate odor complaints.

Why you should consider the DDC-125:

☑️ No diesel compressor required

☑️ Natural gas fuel source for lower carbon footprint

☑️ 4-5x faster than other products in the market

☑️ Automated safety features

☑️ Engineered for gas distribution applications

See how efficient the DDC-125 is. Use the calculator tool below to estimate your drawdown time.

Key Benefits

Engineered for Gas Distribution

The ULC DDC-125 Drawdown Compressor was purpose-built to deliver efficiency for gas distribution utilities and is 4 to 5 times faster than other products in the market.

Powered by Natural Gas

The unit runs off natural gas from the active pipeline network. It never runs out of fuel and does not require air compressors to be delivered to the site.

Loaded With Safety Features

The Drawdown Compressor automatically pauses operation when adverse conditions are detected. Blow-offs on the manifolds also protect against over pressurization.

Automatically Cools Natural Gas

A built-in radiator engages when natural gas reaches temperatures above 100° F to ensure gas being injected into the active system stays below 140°F.

Supports Zero Emissions Goals

Elimination of venting natural gas during routine operations, maintenance and construction activities supports emissions reduction and environmental goals.

Wide Range of Applications

Customers refer to the Drawdown Compressor as a ‘one-stop-shop’ tool that can handle large volumes of natural gas with just one unit on site.

"ULC’s drawdown compressor is able to handle a wide range of distribution volumes and pressures very efficiently and has become a key part of our environmental strategy. Rapid drawdown times also help lower the impact on construction schedules."
national grid gas net zero
Erik K.
Lead Supervisor, National Grid

System Specifications

The patent-pending DDC-125 Drawdown Compressor uses a belt-driven piston compressor powered by a natural gas-driven engine and control panel to extract stranded natural gas, compress it, and inject it back into the active gas main.

  • Max inlet pressure: 300psi
  • Max outlet pressure: 125psi
  • Primary Fuel Source: Natural gas from the discharge side of the operation; no diesel compressors needed 
  • Fuel Usage: ULC’s DDC-125 only uses 0.5% to 0.75% of the natural gas extracted from the drawdown main
  • Secondary Fuel Source: Propane
  • Engine: Natural gas-certified engine
  • Compression: Single-stage natural gas certified compressor
  • Safety: Automated safety features and over-pressurization protection
  • Hose Size: 2″ gas-rated hoses
  • Portability: Mounted on heavy-duty trailer or skid-mounted


The DDC-125 is equipped with over-pressurization protection and 16 automated safety features pause operations for abnormal conditions such as:

  • Low compressor oil pressure
  • Low compressor oil level
  • Low engine oil pressure
  • Low engine oil level
  • High engine water temperature
  • High/low suction pressure
  • High/low discharge pressure
  • High discharge temperature
  • High liquid level in suction scrubber



ULC Technologies’ DDC-125 Data Sheet

Technologies for Gas Distribution Methane Emissions Reduction

Case Study:
National Grid 12,000ft of 8″ operating at 48psig
Read Online

Drawdown Calculator

Enter a gas main diameter, length, and starting pressure to calculate how long a single DDC-125 unit would take to bring the pressure down to 0.5psig. 

The calculator will assume the drawdown main is the same pressure as the discharge main. Calculations are estimated and should be reviewed by our team to confirm accuracy.

Ready To Start Eliminating Emissions?

Contact our team to learn more about the DDC-125 or discuss a demonstration:

Hear From Real Customers

Clint W.
– Chief Construction Inspector, Orange & Rockland Utilities

Before we excavate for replacement of Aldyl-A pipe, we always call ULC to help us avoid third party damages in the field. We won’t dig until ULC marks the main using their long range cameras. Their marks are spot-on, which means fewer holes in the street for our community.

Brett Fisher
– Supervisor of Construction, Elizabethtown Gas

Before we brought in ULC, we had to rely on old records and some of the curb lines have changed or streets have widened, making it challenging to locate the stubs. In-Pipe Locating is a good program to bring in to help us locate the stubs and possibly prevent damages when we’re installing our new gas main.

Ready to Talk?

Contact our team to learn how our cross-compression technology supports emissions reduction and environmental goals. Talk to our team about a demonstration or pilot project today: