Science & Technology

Optimize Glycol Circulation

During the glycol regeneration process, absorbed methane is vented at a rate directly proportional to the glycol circulation. Optimization of glycol circulation rates can reduce methane emissions at negligible cost.

Methanol Injection

Replacing a glycol dehydrator with methanol injection inhibits hydrate formation and eliminates dehydrator emissions.

Glycol Dehydrators

Glycol dehydrators are used to remove water from gas. The glycol absorbs water and methane when contacted with the wet gas. Glycol is then regenerated, where absorbed methane is vented to the atmosphere along with the water vapor.

Equipment Leaks

Equipment leaks, commonly referred to as fugitive emissions, are characterized as unintentional emissions. Leaks occur from equipment components such as connectors, valves, open-ended lines, pressure relief valves, and storage tank thief hatches.

RSIG3D Local/Remote CMAQ File Reader

RSIG3D instructions for reading local and/or remote CMAQ files

Engine Exhaust

Natural gas-fired engines and turbines are used to run compressors throughout the natural gas value chain. In many operations, the natural gas stream is used to power these engines and turbines. Methane emissions result from incomplete combustion.

ARP Enhanced Air Quality Monitoring for Communities - Competitive Grant

ARP competitive grant- enhanced air quality monitoring for communities

Selections for the ARP Enhanced Air Quality Monitoring Competitive Grant

List of selections for the Enhanced Air Quality Monitoring for Communities competitive grant (RFA# EPA-OAR-OAQPS-22-01)

Vapor Recovery Units

Vapor recovery units (VRUs) are commonly used to capture methane emissions from storage tanks and a variety of other low pressure sources such as pipeline pigging operations, compressors, and dehydrators.

Centrifugal Compressors

A centrifugal compressor is used to increase the pressure of natural gas in pipelines. Centrifugal compressors contain rotating shafts that require seals to prevent the high-pressure natural gas from escaping the compressor casing.

Route Blowdown Gas to Low Pressure System

Rerouting blowdown gas (from stations, equipment, or pipelines) to an existing low-pressure gas system can reduce the amount of high-pressure natural gas that would otherwise be emitted to the atmosphere.

Reroute Glycol Skimmer Gas

Some glycol dehydrators use condensate separators to recover natural gas liquids and the non-condensable gas (or skimmer gas) is often vented to the atmosphere. Rerouting the skimmer gas to the reboiler firetubes can reduce emissions.

Pipeline Blowdowns

Pipeline blowdowns are routine operations on transmission and distribution systems to allow operators to safely perform maintenance. This practice involves isolating and depressurizing a section of the pipeline and venting the gas to the atmosphere.

Pneumatic Controllers

Natural gas-powered pneumatic controllers are used in the natural gas industry to operate valves that control liquid level, pressure, and other processes. Some controllers are designed to bleed continuously, while others may bleed gas only when actuated.

Liquids Unloading

Accumulation of liquids (i.e., water and hydrocarbons) in a mature gas well can slow down gas production. To increase gas production, the liquids must be cleared from the well. Removing the liquids is commonly referred to as “liquids unloading.”

Basic Information

NHDPlus is a geospatial, hydrologic framework dataset that is intended for use by geospatial analysts and modelers to support water resources related applications. NHDPlus was developed by the USEPA in partnership with the US Geologic Survey

In-Situ Bioremediation of Contaminated Ground Water

This document is one in a series of Ground Water Issue papers which have been prepared in response to needs expressed by the Ground Water Forum. It is based on findings from the research community in concert with experience gained at sites undergoing ...