Installation
10
DRYPOINT RA 200 – 2500 NA
2.5.
Correction factors
Correction factor for operating pressure changes :
Inlet air pressure
psig
60
80
100
120
140
160
180
200
barg
4
5.5
7
8
10
11
12.5
14
Factor (F1)
0.79
0.91
1.00
1.07
1.13
1.18
1.23
1.27
Correction factor for ambient temperature changes (Air-Cooled):
Ambient temperature
ºF
80
90
100
105
110
115
120
ºC
27
32
38
40
43
45
50
Factor (F2)
1.22
1.11
1.00
0.94
0.89
0.83
0.78
Correction factor for inlet air temperature changes:
Air temperature
ºF
90
100
110
120
130
140
150
160
ºC
32
38
43
50
55
60
65
70
Factor (F3)
1.16
1.00
0.85
0.73
0.63
0.54
0.47
0.40
Correction factor for DewPoint changes:
DewPoint
ºF
38
41
45
50
ºC
3
5
7
10
Factor (F4)
1.00
1.09
1.22
1.36
How to find the air flow capacity:
How to select a suitable dryer for a given duty:
Air flow
capacity
=
X
Factor
(F1)
Factor
(F2)
X
Factor
(F3)
X
X
Factor
(F4)
Nominal
duty
=
÷
Factor
(F1)
Factor
(F2)
÷
Factor
(F3)
÷
÷
Factor
(F4)
Design
air flow
Std. air
flow rate
Minimum
Example:
Example:
An DRYPOINT RA 500 NA has a nominal duty of 500
scfm (849 m3/h). What is the maximum allowable flow
through the dryer under the following operating
conditions:
–
Inlet air pressure = 120 psig (8 barg)
–
Ambient temperature = 105°F (40°C)
–
Inlet air temperature = 105°F (40°C)
–
Pressure DewPoint = 38°F (3°C)
Each item of data has a corresponding numerical factor
as follows:
The procedure here is to list the operating conditions and
then to locate the corresponding numerical factors:
–
Design air flow = 300 scf m (509 m
3
/h)
–
Inlet air pressure = 120 psig (8 barg)
–
Ambient temperature = 105°F (40°C)
–
Inlet air temperature = 105°F (40°C)
–
Pressure DewPoint = 38°F (3°C)
In order to select the correct dryer model the required flow
rate is to be divided by the correction factors relating to
above mentioned parameters:
=
348 scfm (591 m
3
/h)
→
This is the
maximum flow rate that the dryer can accept under
these operating conditions.
=
432 scfm (734 m
3
/h)
→
Therefore the model
suitable for the conditions above is DRYPOINT RA 500
NA (500 scfm or 849 m3/h - nominal duty).
=
x
x
x
x
1.07
500
0.89
1.00
0.85
capacity
Air flow
=
÷
÷
÷
÷
1.07
300
0.89
1.00
0.85
flow rate
Minimum
Summary of Contents for DRYPOINT RA 1000/AC NA
Page 37: ...List of attachments DRYPOINT RA 200 2500 NA 37 7 2 2 Exploded view DRYPOINT RA 200 350 NA ...
Page 38: ...List of attachments 38 DRYPOINT RA 200 2500 NA 7 2 3 Exploded view DRYPOINT RA 400 500 NA ...
Page 39: ...List of attachments DRYPOINT RA 200 2500 NA 39 7 2 4 Exploded view DRYPOINT RA 600 1250 NA ...
Page 40: ...List of attachments 40 DRYPOINT RA 200 2500 NA 7 2 5 Exploded view DRYPOINT RA1500 2500 NA ...
Page 51: ...List of attachments DRYPOINT RA 200 2500 NA 51 ...
