- 行业: Energy
- Number of terms: 18218
- Number of blossaries: 1
- Company Profile:
The American Gas Association represents local energy companies that deliver natural gas throughout the United States.
A practice that pipelines are sometimes accused of employing-buying large packages of gas, and deciding later whether its marketing subsidiary bought it for system supply, or whether its marketing subsidiary bought it for resale on the spot market. Independent marketers complain that this practice gives pipelines an undue advantage in the marketplace. Pipelines counter that their pipeline sales and marketing departments are now completely separate functions.
Industry:Energy
Adiabatic (isentropic) compression takes place when there is not heat added to or removed from the system. Compression follows the formula p1V1k=p2V2k, where exponent k is the ratio of the specific heat capacities. Although an adiabatic cycle is never totally obtained in practice, it is approached typically with most positive-displacement machines and is generally the base to which they are referred. Isothermal compression takes place when the temperature is kept constant as the pressure increases, requiring continuous removal of heat generated during compression. Compression follows the formula p1V1=p2V2. However, in practice it is never possible to remove the heat of compression as rapidly as it is generated. Polytropic compression is a compromise between the two basic processes, the adiabatic and the isothermal. It is primarily applicable to dynamic continuous-flow machines such as centrifugal or axial compressors. Compression follows the formula p1V1n=p2V2n, where exponent n is experimentally determined for a particular type of machine. It may be lower or higher than the exponent k used in adiabatic cycle calculations.
Industry:Energy
Natural gas sold on an as-needed basis, without prior scheduling, to the local distribution company at FERC-approved rates. Prior to implementation of various transportation programs, this constituted all gas delivered to an LDC.
Industry:Energy
The portion of a rate for gas service which is billed to the customer whether they use the service or not. Depending on the rate design this charge is based on actual or estimated peak usage (1 or 3 days), annual needs or a combination of the two. Compare COMMODITY CHARGE.
Industry:Energy
A gas containing relatively large amounts of unsaturated and/or heavy hydrocarbon gases which burn with a luminous flame.
Industry:Energy
A precise listing of the quantities of gas to be transported during any specified time period. A nomination includes all custody transfer entities, locations, compressor fueled and other volumetric assessments, and the precise routing of gas through the pipeline network.
Industry:Energy
AFUDC is a component of construction costs representing net cost of borrowed funds and a reasonable rate on other funds used during the period of construction. AFUDC is capitalized until the project is placed in operation by concurrent credits to the income statement and charges to utility plant, based generally on the amount expended to date on the particular project. Effective January 1, 1977, FERC amended the Uniform System of Accounts establishing formulas for maximum allowable AFUDC rates.
Industry:Energy
