Data and Tools

This page shows all of the pages at www.epa.gov that are tagged with Data and Tools.

  • Reciprocating Compressors

    A reciprocating compressor is used to increase the pressure of natural gas in pipelines. Reciprocating compressors vent natural gas from piston rod packing systems during normal operation.

  • Storage Tanks

    Storage tanks are used to hold oil and gas condensate and operate near atmospheric pressure. Gases dissolved in the oil and condensate 'flash' out of the liquid phase. These vapors, rich in methane, may be vented to the atmosphere.

  • Pipeline Pig Launching and Receiving

    Pipeline pigging is the practice of cleaning and/or inspecting pipelines. During pigging operations, the pig is inserted into the pipeline and is forced through by pipeline pressure or by using compressed gas.

  • Fish Images to Use with Fish Advisories

    The U.S. Environmental Protection Agency developed a set of images to convey fish parts that should not be eaten to reduce possible exposure to chemicals among fish-eating populations.

  • 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.

  • 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.”

  • Contracting Best Practices: Incentives and Penalties

    Best practices for Zero Waste Contracting - Incentives and Penalties

  • Contracting Best Practices

    A wide range of contracting strategies designed to advance towards zero waste are being used by local governments.

  • Procurement Best Practices: Publicly Owned Facilities

    Best procurement practices developed from zero waste case studies - publicly owned facilities

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