Bulletin 74.1:ACE95JR
5
Table 2. Flow Rate Conversion
(1)
MULTIPLY MAXIMUM
PUMP RATE OUT:
BY TO OBTAIN
(1)
:
U.S. GPM
U.S. GPH
m
3
/h
8.021
0.1337
1.01
SCFH
SCFH
Nm
3
/h
Barrels/h
Barrels/day
5.615
0.2340
SCFH
SCFH
1. Gas ow of blanketing gas to replace liquid pumped out.
Table 3. Correction Factors (for converting nitrogen ow rates
to other gas ow rates)
BLANKET GAS
SPECIFIC
GRAVITY
CORRECTION
FACTOR
Natural Gas 0.60 1.270
Air 1.00 0.985
Dry CO
2
1.52 0.797
Correction Factor =
0.985
SG
Thermal Equations
For tanks up to 840,000 gallons / 3180 m
3
capacity:
Equation 1:
Q
thermal
[SCFH air] = V
tank
x 0.0238
Equation 2:
Q
thermal
[SCFH nitrogen] = V
tank
x 0.0238 x 1.015
Equation 3:
Q
thermal
[Nm
3
/h air] = V
tank
x 0.169
Equation 4:
Q
thermal
[Nm
3
/h nitrogen] = V
tank
x 0.169 x 1.015
where,
For Equations 1 and 2: V
tank
= tank volume, gallons
For Equations 3 and 4: V
tank
= tank volume, m
3
Depending on the method, there can be a signicant
difference in the calculated required capacity. No
matter which method is used, the tank must be
equipped with supplemental venting to protect the
tank, product, and personnel in cases of equipment
failure, re exposure, or other conditions that could
cause the tank pressure or vacuum to exceed
operating limits.
Table 4. Capacities in 0.97 Specic Gravity Nitrogen
Capacity Information
Capacity tables are based on 0.97 specic gravity
nitrogen. Nitrogen is the most common blanketing
gas. Should you use a different gas, convert the tabular
values as follows. For blanketing (pad) gases other
than nitrogen, multiply the given nitrogen ow rate by
the correction factors in Table 3. For gases of other
specic gravities, multiply the given nitrogen ow rate by
0.985, and divide by the square root of the appropriate
specic gravity.
Ordering Information
Refer to the Specications section on page 2. Carefully
review each specication and construction feature, then
complete the Ordering Guide.
Also, please complete the Specications Worksheet at
the bottom of the Ordering Guide on page 7.
INLET PRESSURE
C
v
= 0.2,
SCFH / Nm
3
/h
C
v
= 0.4,
SCFH / Nm
3
/h
psig bar
kg/
cm
2
kPa SCFH Nm
3
/h SCFH Nm
3
/h
1
(1)
2
(1)
5
(1)
10
0.07
0.14
0.34
0.69
0.07
0.14
0.35
0.70
6.90
13.8
34.5
69.0
42
61
98
130
1.1
1.6
2.6
4.6
84
120
210
310
2.2
3.2
5.6
8.3
15
20
25
30
1.0
1.4
1.7
2.1
1.06
1.41
1.76
2.11
103
138
172
207
160
210
250
290
4.3
5.6
6.7
7.7
400
480
550
630
10.7
12.9
14.7
16.9
40
50
60
70
2.8
3.4
4.1
4.8
2.81
3.52
4.22
4.92
276
345
414
483
370
450
530
610
9.9
12.1
14.2
16.3
780
930
1070
1230
20.9
24.9
28.7
33.0
80
90
100
120
5.5
6.2
6.9
8.3
5.63
6.33
7.03
8.44
552
621
690
827
690
780
860
1020
18.5
20.9
23.0
27.3
1390
1560
1720
2040
37.3
41.8
46.1
54.7
140
160
180
200
9.6
11.0
12.4
13.8
9.85
11.3
12.7
14.1
965
1103
1241
1379
1180
1340
1500
1660
31.6
35.9
40.2
44.5
2360
2680
3000
3330
63.2
71.8
80.4
89.2
1. Assumes an outlet (control) pressure of 5-inches w.c. / 12 mbar or less.
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