Correction Factors - Fini RD 185-810 User Manual

40069 Zola Predosa (BO) - ITALY
Correction factor for operating pressure changes :
Inlet air pressure
Factor (F1)
Correction factor for ambient temperature changes (Air-Cooled):
Ambient temperature
Factor (F2)
Correction factor for inlet air temperature changes:
Air temperature
Factor (F3)
Correction factor for DewPoint changes:
DewPoint
Factor (F4)
How to find the air flow capacity:
Air flow Nominal Factor
=
X
capacity duty (F1)
Example:
An RD 185 has a nominal duty of 18500
l/min. What is the maximum allowable flow
through the dryer under the following operating
conditions:
Inlet air pressure = 8 barg
−
Ambient temperature = 45° C
−
Inlet air temperature = 50° C
−
Pressure DewPoint = 10° C
−
Each item of data has a corresponding numerical
factor which multiplied by the design air flow is as
follows:
Air flow
18500 1.06
= x
capacity
= 13206 l/min → This is the maximum
flow rate that the dryer can accept under these
operating conditions.

2.5 CORRECTION FACTORS

barg 4
0.77
ºC < 25
1.00
ºC < 30
1.20
ºC 3
1.00
Factor Factor Factor
X X X
(F2) (F3) (F4)
0.80 0.61 1.38
x x
x
info@finicompressors.it
5 7
0.85 1.00 1.06
30 35
0.98 0.95
35 40
1.00 0.85
5
1.09
How to select a suitable dryer for a given duty:
Minimum
Design
=
Std. air
air flow
flow rate
Example:
The procedure here is to list the operating
conditions and
corresponding numerical factors:
Design air flow = 16200 l/min
−
Inlet air pressure = 8 barg
−
Ambient temperature = 45° C
−
Inlet air temperature = 50° C
−
Pressure DewPoint = 10° 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:
Minimum
16200
=
flow rate
= 22693 l/min → Therefore the model
suitable for the conditions above is RD 250 (25000
l/min - nominal duty).
8 10 12
1.15 1.21
40
0.90
45 50
0.75 0.61
7
1.18
Factor Factor Factor
÷ ÷ ÷
(F1) (F2) (F3)
then to locate
1.06 0.80 0.61
÷ ÷
÷
- EN -
14
1.25
45
0.80
55
0.49
10
1.38
Factor
÷
(F4)
the
1.38
÷