Encyclopedia of Environmental Science and Engineering, Volume I and II

PARTICULATE EMISSIONS 825

TABLE 3 (continued)

Subpart Source Particulate Emissions Opacity (%)

UU Asphalt roofing

shingle of mineral-surfaced roll

saturated felt or smooth surfaced roll

Asphalt blowing still

with catalyst addition

with catalyst addition, #6 oil afterburner

no catalyst

no catalyst, #6 oil afterburner

Asphalt storage tank

Asphalt roofing mineral handling and storage

0.04 g/kg

0.4 g/kg

0.67 g/kg

0.71 g/kg

0.60 g/kg

0.64 g/kg

20

20

— — — — 0 1

AAA Residential wood heaters

with catalytic combustor

no catalytic combustor

4.1 g/hr

7.5 g/hr

—

—

OOO Nonmetallic mineral processing

stack or transfer point on belt conveyors

fugitive emissions

crusher fugitive emissions

0.05 g/dscm

—

—

7

10

15

PPP Wool fiberglass insulation 5.5 g/kg

UUU Calciners & dryers in mineral industries 0.092 g/dscm 10*

*Continous monitoring by capacity meters required

The above standards apply to current construction. Existing unmodified units may have lower standards.

Many applications require continuous monitoring of operating variables for process and control equipment.

the Lost Angeles Air Pollution Control district, referred

to as APCD,^21 and the Western Precipitation Division,

referred to as WP.^21 This article will only treat the general

procedures and not significant differences between popu-

lar techniques.

Velocity Traverse Points Because of flow non-uniformity,

which almost invariably occurs in large stacks, the stack

cross section in the sampling plane must be divided into a

number of smaller areas and gas velocity determined sepa-

rately in each area. Circular ducts are divided by concentric

circles, and 2 velocity traverses are made at right angles.

Figure 4 shows a typical example. Location of the sample

points can be determined from the formula

RD

n

n N



21 

(^2)
where
R n = distance from center of duct to the “ n th” point
from the center
D = duct diameter
n = sample point number, counting from center
N = total number of measurement points in the duct. The
number of sample points along one diameter is N /2.
For rectangular ducts the cross section is divided into
N equal rectangular areas such that the ratio of length to
width of the areas is between one and two. Sample points are
at the center of each area.
The number of traverse points required is usually speci-
fied in the applicable test code as a function of duct area or
diameter. Representative requirements are shown in Table 4.
S-6
S-5
S-4
E-5E-6 E-4 E-3 E-2 E-1
EAST
S-3
S-2
S-1
SOUTH
R 3
R 2
R 1
FIGURE 4 Velocity and sampling traverse positions
in circular ducts.
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