Call toll free: 800-544-4379

Sahara Air Products

Exhaust Purge Air Dryer

Theory of Operation

 

Wet compressed air enters the top of the dryer and is directed to the drying tower by one of two solenoid actuated, non-lubricated switching valves. At the outlet of the dryer, 7% of the dry air is directed into an electric heater and heated to 375°F. This hot, dry “purge air” becomes “super dry” as it expands to atmospheric pressure in the regenerating tower where it removes moisture from the saturated desiccant.

 

After 3 hours of heating, the heater is turned off and the dry purge air is now used to cool the desiccant. After 1 hour of cooling, the regenerating tower is slowly pressurized and the valves are switched so that wet inlet air flows through the dried desiccant. Because we use a full 7% purge rate during our 1 hour cooling cycle, and bypass the heater during cooling, we reduce the temperature and dew point spike that occurs with competitive low purge flow, heat-reactivated dryers.

 

In models equipped with the optional Dew Point Demand System, a dew point transmitter senses desiccant saturation, overrides the timer, and extends the drying cycle.

Exhaust Purge Flow Diagram Acrobat icon Get Adobe Reader

Specifications

Specifications

EP top

Model

Length = A
(Inches)

Width = B
(Inches)

Height = C
(Inches)

Conn. Size

Purge Rate
(SCFM)

Lbs. Desiccant per Tower

Heater Size
(KW)

Approx. Weight
(Lbs.)

Avg. Power

(KWH/24Hrs.)

EP-7

28

8

24

1/4

.5

4

.5

186

1

EP-14

28

8

26

1/4

1

8

.5

197

1.7

EP-35

45

12

35

1/2

2.5

20

.5

384

4

EP-56

45

12

42

1/2

4

32

1

486

6.4

EP-70

58

25 1/2

63

3/4

4.9

40

1

486

7.8

EP-100

62

33 1/2

63

1

7.0

60

1

621

12

EP-140

62

33 1/2

63

1

9.8

80

2

675

15.5

EP-210

55

38

63

1 1/2

14.7

120

2

749

23.1

EP-280

55

38

63

1 1/2

19.6

160

3

1097

30.8

EP-350

66

45

75

2

24.5

200

3

1242

38.5

EP-420

66

45

75

2

29.4

240

4

1350

46.2

EP-490

69

44

74 1/2

2

35

280

4

1566

54.9

EP-560

69

44

74 1/2

2

40

320

5

1782

62.8

EP-630

82

46

77 1/2

3

45

360

5

2052

70.6

EP-700

82

46

92 1/2

3

50

400

7.5

2160

78.5

EP-770

90 1/4

46

96

3

54

440

7.5

2687

84.7

EP-840

90 1/4

46

96

3

59

480

7.5

2794

92.6

EP-980

90 1/4

46

85

3

69

560

10

3145

108

EP-1120

90 1/4

46

85

3

78

640

10

3375

122.3

EP-1260

90 1/4

46

85

3

88

720

12

3591

138

EP-1400

103 1/2

50 1/2

91 1/4

3

98

800

12

4360

153.7

EP-1540

103 1/2

50 1/2

97

4

108

880

15

4711

169.3

EP-1680

103 1/2

50 1/2

97

4

118

960

15

4927

185

EP-1820

103 1/2

50 1/2

97

4

127

1040

15

5197

199.1

EP-1960

103 1/2

51 1/2

91 1/4

4

137

1120

24

5414

214.8

EP-2100

116

62

109

4

147

1200

24

5994

230.4

EP-2380

116

62

109

4

167

1360

24

6210

261.8

EP-2520

135

48

109

6

176

1400

24

6831

275.9

EP-2660

135

48

109

6

183

1520

24

7047

286.8

EP-2800

135

48

109

6

196

1600

24

7304

307.2

EP-2940

135

48

109

6

206

1680

24

7519

322.9

EP-3080

135

48

109

6

216

1760

30

7735

338.5

EP-3220

135

48

109

6

225

1840

30

8073

352.6

EP-3360

135

48

109

6

235

1920

30

8168

368.3

Sahara reserves the right to make changes without notification. Some models not shown. Metric dimensions available upon request.

Ratings are based on 100 PSIG, 100°F. Other pressures available. Larger sizes available.

Our sales engineers will help you select the right system for your application. They have the expertise to review your plant air system and design the optimum engineered solution.

 

We can build a dryer to meet your strict performance requirements.