DSHD Series - Heatless Modular Desiccant Air Dryers
DSHD Series - Heatless Modular Desiccant Air Dryers
Product Type:
DRYERS - COMPRESSED AIR / DESICCANT COMPRESSED AIR DRYERS
DSHD Series Modular Desiccant Air Dryers are ideal for point of use, laboratories and confined areas. They provide a continuous supply of dry compressed air by automatically cycling the flow of air through two desiccant beds.
FEATURES
Hankison’s HSHD Series Modular Desiccant Air Dryers protect moisture sensitive applications requiring low-pressure dew points. Delivers dew points of ISO 8573-1: 2010 Class 1 (-100°F, -70°C) and Class 2 (-40°C) with flow rates of 7 to 40 scfm (12 to 68 nm3/h). Critical applications include labs, hospitals, pharmaceutical manufacturing, and other high-tech installations.
The HSHD Series Dryers incorporate a time-proven design, with superior features and reliability, in a compact and easy to install package. Standard features include:
THEORY OF OPERATION
Compressed air enters the dryer and is directed to Tower 1 by valve (A), and then to the dryer outlet through shuttle valve (B). A portion of the dried air is throttled to near atmospheric pressure by means of orifice (C). This extremely dry, low-pressure air flows through and regenerates the desiccant in Tower 2 and is exhausted through purge/repressurization valve (D) and exhaust muffler (E) to atmosphere. After a set time, the automatic solid state timer closes purge/repressurization valve (D) allowing Tower 2 to repressurize slowly. At the end of 2 minutes, valve (A) shifts and purge/ repressurization valve (D) reopens. The main air flow is now dried by Tower 2 while Tower 1 is being regenerated.
SPECIFICATIONS
TABLE 1 - INLET & PURGE FLOWS @ 100 PSIG
|
Model
|
INLET FLOW RATING1
SCFM (NM3/H)
|
PURGE FLOW2
SCFM (NM³/H)
|
IN/OUT
CONNECTIONS
|
|
|
-40°F
|
(-40°C)
|
-94°F
|
(-70°C)
|
Average
|
Maximum
|
IN
|
|
DSHD-7
|
7
|
12
|
5
|
8
|
1.5
|
2.3
|
1.8
|
2.7
|
1/2" NPT
|
|
DSHD-13
|
13
|
22
|
9
|
15
|
2.7
|
4.5
|
3.7
|
5.1
|
1/2" NPT
|
|
DSHD-18
|
18
|
31
|
12
|
20
|
3.7
|
5.7
|
4.4
|
6.5
|
1/2" NPT
|
|
DSHD-21
|
21
|
36
|
14
|
23.5
|
4.6
|
7.2
|
5.4
|
8.1
|
1/2" NPT
|
|
DSHD-27
|
27
|
46
|
18
|
30.5
|
5.3
|
8.3
|
6.2
|
9.2
|
1/2" NPT
|
|
DSHD-40
|
40
|
68
|
27
|
45.5
|
9.7
|
15
|
11.6
|
16.1
|
1/2" NPT
|
1 Inlet flows are established in accordance with CAGI (Compressed Air and Gas Institute) standard ADF-200, Dual Stage Regenerative Desiccant Compressed Air Dryers - Methods for Testing and Rating. Conditions for rating dryers are: inlet pressure - 100 psig (7 kg/cm2); inlet temperature - saturated at 100°F (38°C).
2 Average Purge Flow is the total amount of air used to purge and repressurize off-stream towers averaged over the cycle time. Maximum Purge Flow is the flow rate through the off-stream tower during that portion of the cycle the purge/ repressurization valve is open.
TABLE 2 - INLET & PURGE FLOW CORRECTION FACTORS
|
INLET
PRESSURE
|
psig
|
50
|
70
|
90
|
100
|
110
|
120
|
130
|
150
|
|
|
kg/cm2
|
3.5
|
4.9
|
6.3
|
7
|
7.7
|
8.4
|
9.1
|
10.5
|
|
MULTIPLIER A
|
0.31
|
0.54
|
0.83
|
1.00
|
1.09
|
1.17
|
1.26
|
1.44
|
|
MULTIPLIER B
|
0.55
|
0.73
|
0.91
|
1.00
|
1.09
|
1.17
|
1.26
|
1.44
|
CAPACITY CORRECTION FACTORS
- To determine maximum inlet flow at inlet pressures other than 100 psig (7 kg/cm2), multiply inlet flow from Table 1 by multiplier A from Table 2 that corresponds to system pressure at inlet of dryer.
- To determine purge flow at inlet pressures other than 100 psig (7 kg/cm2), multiply purge flow at 100 psig (7 kg/cm2), from Table 1 by multiplier B from Table 2 that corresponds to system pressure at inlet of dryer.
- To determine outlet flow capacity, subtract purge flow from inlet flow.
DIMENSIONS
Select Model DSHD-7
|
MODEL
|
DIMENSIONS
|
WEIGHT
|
|
|
H
|
W
|
D
|
|
|
|
IN
|
MM
|
IN
|
MM
|
IN
|
MM
|
LBS
|
KG
|
|
DSHD-7
|
19
|
494
|
14
|
346
|
7
|
168
|
77
|
35
|
