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About This Item

 

Full Description

This standard provides methodology to estimate emissions of individual hydrocarbon species using the total emissions of multicomponent hydrocarbon mixtures (such as crude oils and gasoline) estimated from API MPMS Ch. 19.1 for fixed-roof tanks, API MPMS Ch. 19.2 for floating-roof tanks, API MPMS Ch. 19.5 for marine vessels, and other methods used for total hydrocarbon emission estimates. This process is referred to as speciation.

Speciation of emissions from hydrocarbon mixtures accounts for the higher evaporation rate of the more volatile components, resulting in a different composition of the mixture in the vapor phase than in the liquid phase. The methodology presented in this standard assumes that there is sufficient liquid present such that the chemical composition at the liquid surface may be considered to not change as a result of the evaporative loss.

This standard also contains reference information used for estimating emissions in accordance with API MPMS Ch. 19.1, API MPMS Ch.19.2, and API MPMS Ch.19.5.

The methodology in this standard applies to:
a) liquids with vapor pressure that has reached equilibrium with ambient conditions at a true vapor pressure less than the ambient atmospheric pressure (i.e. not boiling);
b) liquids for which the vapor pressure is known or for which sufficient data are available to determine the vapor pressure;
c) liquid mixtures where Raoult's Law can be used to describe the vapor phase equilibria.

This methodology does not apply to:
d) emissions that result from leaks from piping components (e.g. valves, flanges, pumps, connectors etc.);
e) liquid mixtures where Raoult's Law cannot be used to describe the vapor phase equilibria (e.g. mixtures in which hydrocarbons are dissolved in water, or mixtures of hydrocarbons with alcohols).
 

Document History

  1. API MPMS Chapter 19.4

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    Recommended Practice for Speciation of Evaporative Losses, Third Edition, Includes Addendum 1 (2013), Addendum 2 (2017)

    • Most Recent
  2. API MPMS Chapter 19.4


    Recommended Practice for Speciation of Evaporative Losses, Second Edition, Includes Errata (2007)

    • Historical Version
  3. API MPMS Chapter 19.4


    Recommended Practice for Speciation of Evaporative Losses

    • Historical Version
 

Amendments, rulings, supplements, and errata

  1. API MPMS Chapter 19.4 Addendum 1

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    Addendum 1 to Recommended Practice for Speciation of Evaporative Losses, Third Edition