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{longname} Q154. What additional considerations are necessary when using a mass flow meter for landfill gas? {longname} |
A154.
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If
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a
...
mass
...
flow
...
meter
...
is
...
used,
...
then
...
the
...
terms
...
associated
...
with
...
volumetric
...
flow
...
and
...
conversion
...
to
...
standard
...
conditions
...
(i.e.,
...
(V)n
...
×
...
520°R/(T)n
...
×
...
(P)n/1
...
atm)
...
must
...
be
...
replaced
...
by
...
the
...
mass
...
flow,
...
M,
...
and
...
a
...
correction
...
to
...
standard
...
volumetric
...
flow
...
using
...
the
...
average
...
molecular
...
weight
...
of
...
the
...
gas
...
stream,
...
MWave,
...
as
...
follows:
...
M
...
×
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836.6/MWave,
...
where
...
836.6
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is
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the
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molar
...
correction
...
volume
...
(cf/kg-mol)
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at
...
60ºF
...
and
...
1
...
atm.
...
The
...
average
...
molecular
...
weight
...
can
...
be
...
determined
...
using
...
the
...
GC
...
methods,
...
but
...
the
...
compositional
...
analyses
...
should
...
be
...
provided
...
on
...
a
...
wet
...
basis.
...
If
...
the
...
gas
...
composition
...
is
...
measured
...
on
...
a
...
dry
...
basis,
...
the
...
moisture
...
content
...
must
...
also
...
be
...
measured
...
and
...
the
...
dry
...
gas
...
compositions
...
corrected
...
for
...
the
...
moisture
...
content.
...
If
...
methane
...
composition
...
is
...
measured
...
using
...
an
...
alternative
...
gaseous
...
organic
...
concentration
...
measurement
...
or
...
other
...
infrared
...
method
...
(like
...
LandTec
...
GEM
...
units),
...
then
...
GC
...
methods
...
or
...
ASTMD2503-92
...
(Reapproved
...
2007)
...
(see
...
§98.34(b)(5)(iv))
...
will
...
still
...
need
...
to
...
be
...
performed
...
in
...
order
...
to
...
determine
...
the
...
average
...
molecular
...
weight
...
of
...
the
...
landfill
...
gas
...
during
...
the
...
measurement
...
period.
...
Note
...
that
...
temperature
...
and
...
pressure
...
monitoring
...
is
...
not
...
needed
...
when
...
mass
...
flow
...
meters
...
are
...
used.
...
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Source: This question and answer was derived from a Legacy FAQ
Approval / Publishing History: Version 1
Expiration : none
Relevant Subparts: Subpart HH
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