TM 5-815-1/AFR 19-6
Chart offers a set of standards with which to measure
have a removable cover. On double wall stacks
the opacity of an effluent plume. By the comparison of
sampling ports may consist of a 4-inch diameter pipe
the blackness of a plume to the blackness of a series of
extending from 4 inches outside the stack to the inner
graduated light diffusers, a Ringelmann number corre-
edge of the inner stack wall. Accessible sampling ports
sponding to a percent opacity can be assigned to the
shall be provided and located so that the cross sectional
plume (see table 5-3). It should be noted that while
area of the stack or flue can be traversed to sample the
Ringelmann numbers give a relative indication of
flue gas in accordance with the applicable current
plume opacity, they bear no direct relationship to
federal or state regulations for fuel burning equipment.
plume particulate loading. They should supplement but
5-5.
Air pollution project contacts
not replace point-source emission tests.
U.S. Army Environmental Hygiene Agency (AEHA),
Aberdeen Proving Grounds, MD, may be contacted for
the respective service air pollution projects on the fol-
lowing:
a. Source testing to characterize pollutants for
design controls.
b. Consultation on test performance standards and
witnessing tests.
5-4.
Flue gas sampling ports
c. Testing of installed air pollution abatement equip-
Sampling ports are approximately 4 inches in diameter,
ment for compliance with regulatory standards.
extend out approximately 4 inches from the stack, and
5-3
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