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Size Liquid Motive for Exhausting Gases |
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| Example: |
| Desired Suction
Flow, Qs |
5 Lb/Hr air |
| Desired Suction Pressure,Ps |
5 In Hg Vac |
| Motive Water Pressure,
Pm |
40 PSIG |
| Outlet Pressure, Po |
11 Ft Head |
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| Step 1 |
| Convert the figures from given units
to units used in the performance tables. |
| 5 Lb/Hr x 13.35 Ft 3 /Lb/60
Minutes = 1.1 SCFM Air |
| 5 In Hg Vac = 29.92 In Hg
Abs - 5 In Hg = 24.92 In Hg Absolute |
| 40 PSIG is available - 11
Ft Head/2.3 I(Ft/PSIG)=4.8 PSIG |
|
| Step 2 |
| Look down the Outlet Pressure (Po)
column until the row is reached that has 5 psig outlet pressure. |
| |
| Step 3 |
| Locate the suction pressure (Ps)
that is equal to the desired suction pressure for the chosen outlet
pressure. In this case, go to the section with a suction pressure
of 25 In Hg Abs. |
| |
| Step 4 |
| Find the column in the 25 In Hg
row that has a motive pressure (Pm) of 40 PSIG. |
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| Step 5 |
| Divide the suction flow desired
by the Tabulated Suction Flow of each of the units to determine
the desired S.F. |
- 1.1 SCFM Desired/1.8 ML Tabulated Suction Flow =
.65 Desired S.F.
- 1.1 SCFM Desired/3.7 NILE tabulated flow = 30 Desired
S.F.
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| From the SY's above, it appears
that the MLE will be more efficient. The 1" unit has a S.F.
of.34. When we multiply the S.F. by the suction flow for the 1-1
/2" unit, we find an actual suction flow of: |
- .34 x 3.7 =1.3 SCFM Actual Suction Flow
|
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| Step 6 |
| The water needed to operate the
MLE 1" will be 24.2 GPM x.34 S.F. = 8.2 GPM. |
| |
Models SG and HG |
Gas Motive Exhausting
Gases |
1-1/2" Unit |
|
Suction
Press., PS (In Hg Abs) |
Motive
Pressure Pm (psig) / Gas Flow
Qs (scfm) |
|
20
(psig) |
40
(psig) |
60
(psig) |
80
(psig) |
100
(psig) |
120
(psig) |
|
SG |
HG |
SG |
HG |
SG |
HG |
SG |
HG |
SG |
HG |
SG |
HG |
30 |
- |
42 |
- |
33 |
61 |
31 |
59 |
29 |
56 |
- |
52 |
- |
25 |
- |
30 |
- |
28 |
50 |
25 |
47 |
23 |
44 |
- |
41 |
- |
20 |
- |
16 |
- |
21 |
39 |
19 |
35 |
17 |
33 |
- |
30 |
- |
15 |
- |
1 |
- |
13 |
28 |
11 |
24 |
10 |
23 |
- |
11 |
- |
10 |
- |
0 |
- |
5 |
17 |
2 |
14 |
0 |
12 |
- |
11 |
- |
5 |
- |
0 |
- |
0 |
0 |
0 |
1 |
0 |
0 |
- |
0 |
- |
Max
Outlet Press., Po (PSIG) |
- |
0 |
- |
6 |
2 |
15 |
6 |
20 |
10 |
- |
12 |
- |
Motive
Flow, Qm |
|
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|
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|
|
|
Steam
(Lb/Hr) |
- |
237 |
- |
367 |
|
278 |
626 |
335 |
- |
392 |
- |
Air
(SCFM) |
- |
78 |
- |
123 |
|
92 |
209 |
112 |
- |
131 |
- |
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ML,
MLE, SG, HG -- Sizing Factors
(S.F.)
|
Unit
Size |
1/2" |
3/4" |
1" |
1-1/4" |
1-1/2" |
2" |
2-1/2" |
3" |
4" |
6" |
8" |
10" |
12" |
S.F. |
0.12 |
0.21 |
0.34 |
0.61 |
1.00 |
1.82 |
3.17 |
5.92 |
11.8 |
24.0 |
49.0 |
71.0 |
123.0 |
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