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Document API MPMS 19.4 ERTA is offered by IHS as part of an online subscription. This subscription contains many documents on the same topic.
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API MPMS 19.4 ERTA Document Information:
Title
Manual of Petroleum Measurement Standards Chapter 19.4 - Recommended Practice for Speciation of Evaporative Losses
American Petroleum Institute
Publication Date:
Mar 1, 2007
Scope:
This publication contains recommended methods for estimating
specific organic compound vapor emissions from operations handling
multicomponent hydrocarbon mixtures (such as crude oils and
gasoline). Such an estimate is called speciation. The API Committee
on Evaporation Loss Estimation developed this publication.
This publication assumes that the user has access to API MPMS
19.1 for Fixed-Roof Tanks, API MPMS 19.2 for Floating-roof Tanks,
and API Publication 2514A for Marine Vessels, and uses those to
calculate total hydrocarbon emissions. The methods in these
publications are used to estimate annual losses from various types
of tank construction (including fixed and floating roofs), liquid
stocks, stock vapor pressures, tank sizes, and wind speeds. They
are also applicable for estimating annual losses from loading and
unloading operations for various types of marine vessels, types and
volumes of cargo, and compartment treatment.
The methodology in this document 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.
Speciation of emissions from hydrocarbon mixtures accounts for
the preferential evaporation 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
publication 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
methodology does not apply to:
a. a thin layer of liquid which may readily lose a significant
portion of its more volatile components within the period of time
for which emissions are to be estimated.
b. emissions that result from leaks of a liquid stream (e.g.,
equipment leaks).
When a layer of liquid is sufficiently thin that virtually all
of the liquid will evaporate within the period of time for which
emissions are to be estimated, then the composition of the vapor
phase should be taken as equivalent to the composition of the
liquid phase. This is the case for withdrawal losses from
floating-roof tanks, where the withdrawal losses consist of
evaporation of the liquid that clings to the tank shell as liquid
is withdrawn from the tank.
Similarly, emissions that result from leaks of a liquid stream
should be assumed to have the same composition as the liquid phase
of the stream.
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