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Interpretation Response #PI-08-0010 ([State of Colorado Public Utilities Commission] [Mr. Stephan Pott, PE])

Below is the interpretation response detail and a list of regulations sections applicable to this response.

Interpretation Response Details

Response Publish Date:

Company Name: State of Colorado Public Utilities Commission

Individual Name: Mr. Stephan Pott, PE

Location State: CO Country: US

View the Interpretation Document

Response text:

February 20, 2009

Mr. Stephan Pott, PE

Chief, Gas Pipeline Safety

State of Colorado Public Utilities Commission

1560 Broadway, Suite 250

Denver, CO 80202

Ref. No.: PI-08-0010

Dear Mr. Pott:

The Pipeline and Hazardous Materials Safety Administration (PHMSA) reviewed your December 11, 2008, letter transmitting an October 22, 2008, petition received by the Colorado Public Utilities Commission (CO-PUC) from DCP Midstream for a finding that the endpoint of the gathering designation for an intrastate gas pipeline should be extended beyond a gas processing plant.  Specifically, DCP Midstream requested a finding that the gathering designation for a rural section of the ANGI intrastate pipeline be extended an additional 7.8 miles from the DCP Midstream Greeley Plant to the DCP Midstream Mewbourn Gas Plant, both of which are located in Weld County, Colorado. 

Per 49 CFR § 192.8 (a)(2) and Section 2.2 (a)(1)(A) of API RP 80, DCP Midstream included documentation they feel demonstrates that extending the gathering designation an additional 7.8 miles from the Greely Plant to the Mewbourn Plant was justified based on sound engineering principles.

Additional correspondence with DCP Midstream determined the following:

  • The Greeley Plant separates the methane out and sells it there; the liquids are placed in tanks at the facility and eventually transported to the intended destination via truck.
  • The remainder of the gas, including 90% ethane, 5% methane, and 2% CO2  is then transported to the Mewbourn Plant for additional processing.
  • The normal operating pressure of the line is approximately 300 psig, down to approximately 150 psig when delivered to the downstream plant


Based on the information provided in DCP Midstream"s petition, the additional correspondence, and your recommendation, PHMSA finds that extending the endpoint of the gathering designation for the ANGI gas pipeline an additional 7.8 miles to the Mewborne Plant is warranted as long as the current operating parameters and operating pressures remain the same.  Accordingly, to the extent this condition is met, PHMSA grants the petition.  If DCP Midstream makes any significant changes to the operation of this line, such as increasing the pressure to where the ethane might be in a liquid super critical phase, DCP Midstream will be required to contact the CO-PUC and/or PHMSA"s Western Region to make a new determination.



                                                                        John A. Gale

Director, Office of Regulations

Regulation Sections

Section Subject
192.8 How are onshore gathering lines and regulated onshore gathering lines determined?