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8-3
Specifications
TABLE 8-5. Air Flow Rate Limits at 59 °F (15 °C).
NOTE
The Model 8800C Flowmeter measures the volumetric flow under operating conditions (i.e., the actual volume at the operating pres-
sure and temperature—acfm or acmh), as shown above. However, gas volumes are strongly dependent on pressure and temperature.
Therefore, gas quantities are typically stated in standard or normal conditions (e.g., scfm or ncmh). (Standard conditions are typically
59 °F and 14.7 psia. Normal conditions are typically 0 °C and 1 bar abs.)
The flow rate limits in standard conditions are found using the equations below.
Standard Flow Rate = Actual Flow Rate X Density Ratio.
Density Ratio = Density at Actual (Operating) Conditions/Density at Standard Conditions.
Process
Pressure
Flow Rate
Limits
Minimum and Maximum Air Flow Rates
½ in./DN 15 1 in./DN 25 1½ in./DN 40 2 in./DN 50
ACFM ACMH ACFM ACMH ACFM ACMH ACFM ACMH
0 psig
(0 bar gauge)
max
min
27.9
4.29
47.3
7.29
79.2
7.81
134
13.3
211
18.4
359
31.2
349
30.3
593
51.5
50 psig
(3.45 bar gauge)
max
min
27.9
1.31
47.3
2.22
79.2
3.72
134
6.32
211
8.75
359
14.9
349
14.5
593
24.6
100 psig
(6.89 bar gauge)
max
min
27.9
0.99
47.3
1.67
79.2
2.80
134
4.75
211
6.57
359
11.2
349
10.9
593
18.5
150 psig
(10.3 bar gauge)
max
min
27.9
0.83
47.3
1.40
79.2
2.34
134
3.98
211
5.50
359
9.34
349
9.09
593
15.4
200 psig
(13.8 bar gauge)
max
min
27.9
0.83
47.3
1.40
79.2
2.34
134
3.98
211
5.50
359
9.34
349
9.09
593
15.4
300 psig
(20.7 bar gauge)
max
min
27.9
0.83
47.3
1.40
79.2
2.34
134
3.98
198
5.50
337
9.34
327
9.09
556
15.4
400 psig
(27.6 bar gauge)
max
min
25.9
0.83
43.9
1.40
73.5
2.34
124
3.98
172
5.50
293
9.34
285
9.09
485
15.4
500 psig
(34.5 bar gauge)
max
min
23.2
0.83
39.4
1.40
66.0
2.34
112
3.98
155
5.50
263
9.34
256
9.09
435
15.4
Process
Pressure
Flow Rate
Limits
Minimum and Maximum Air Flow Rates
3 in./DN 80 4 in./DN 100 6 in./DN 150 8 in./DN 200
ACFM ACMH ACFM ACMH ACFM ACMH ACFM ACMH
0 psig
(0 bar gauge)
max
min
769
66.8
1,307
114
1,326
116
2,253
196
3,015
262
5,122
445
5,211
453
8,853
769
50 psig
(3.45 bar gauge)
max
min
769
31.8
1,307
54.1
1,326
54.8
2,253
93.2
3,015
125
5,122
212
5,211
216
8,853
367
100 psig
(6.89 bar gauge)
max
min
769
23.9
1,307
40.6
1,326
41.2
2,253
70.0
3,015
93.7
5,122
160
5,211
162
8,853
276
150 psig
(10.3 bar gauge)
max
min
769
20.0
1,307
34.0
1,326
34.5
2,253
58.6
3,015
78.4
5,122
134
5,211
136
8,853
231
200 psig
(13.8 bar gauge)
max
min
769
20.0
1,307
34.0
1,326
34.5
2,253
58.6
3,015
78.4
5,122
134
5,211
136
8,853
231
300 psig
(20.7 bar gauge)
max
min
721
20.0
1,226
34.0
1,243
34.5
2,112
58.6
2,827
78.4
4,803
134
4,886
136
8,302
231
400 psig
(27.6 bar gauge)
max
min
628
20.0
1,068
34.0
1,083
34.5
1,840
58.6
2,463
78.4
4,184
134
4,257
136
7,232
231
500 psig
(34.5 bar gauge)
max
min
564
20.0
958
34.0
972
34.5
1,652
58.6
2,210
78.4
3,756
134
3,821
136
6,492
231