While not specifically addressed under Quad-O, glycol dehydrator emission standards have been tightened under amendments to CFR National Emission Standards for Hazardous Air Pollutants (NESHAP) from oil and natural gas production facilities (Subpart HH) and from natural gas transmission and storage facilities (Subpart HHH).
Major sources are determined by the aggregate emission totals from the glycol dehydrators and storage vessels on site.
Small glycol dehydrators are defined as processing less than 85,000 m3 per day on average annually and must meet a specific limit of BTEX (benzene, toluene, ethylbenzene and xylene) emissions based on the unit's throughput and gas composition.
For this rule, a glycol dehydrator
would be considered small if it has an annual average natural gas throughput of less than 10 MMcf/d or annual average benzene emissions of less than 1 ton.
36 pounds per gallon and is usually acidic when it leaves the glycol dehydrator
This subcategory consists of glycol dehydrators
with an actual annual average natural gas flow rate of less than 283,000 standard cubic meters per day (scmd) or actual average benzene emissions less than 0.
Recommendation: To ensure that Interior has a complete picture of venting and flaring on federal leases and takes steps to reduce this lost gas where economic to do so, and to help reduce venting and flaring of gas by addressing limitations in their regulations, the Secretary of the Interior should direct BLM and BOEMRE to revise its guidance to operators to make it clear that technologies should be used where they can economically capture sources of vented and flared gas, including gas from liquid unloading, well completions, pneumatic valves, and glycol dehydrators
In Anadarko's case, these emissions reductions were achieved through the implementation of a variety of Natural Gas STAR technologies including the installation of flash tank separators on glycol dehydrators
, the redesign of several emergency procedures and the installation of electric compressor engines.
The company has expanded over the years into the design, construction and start up of many types of facilities, including amine plants, physical solvent plants, glycol dehydrators
, refrigeration/dew point control plants and catalytic oxygen removal units.