Data sheet

Data sheet

PAHT 2-308 pumps /

PAHT G 2-308 pumps /

ATEX PAHT G pump

Data sheet

Table of Contents

1. Introduction

PAHT 2-308 pumps

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

2. Benefits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

3.

4.

4.1

4.2

4.3

4.4

Application examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

PAHT 2-12.5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

PAHT 20-32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

PAHT 50-90 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

PAHT 256-308. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

5. Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

5.1

5.2

5.3

5.4

5.5

PAHT 2-6.3 typical flow curves at max pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

PAHT 10-12.5 typical flow curves at max pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

PAHT 20-32 typical flow curves at max pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

PAHT 50-90 typical flow curves at max pressure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

PAHT 256-308 typical flow curves at max pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

6. Motor requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

7. Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

7.1 Filtration

7.2 Noise

7.3

7.4

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Open-system design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Closed-system design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

8.

8.1

8.2

8.3

8.4

8.5

8.6

Dimensions and connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

PAHT 2-6.3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

PAHT 10-12.5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

PAHT 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

PAHT 25-32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

PAHT 50-90 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

PAHT 256-308. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

9. Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

•

•

•

The Danfoss range of PAHT high-pressure pumps is specifically designed for use with technical water such as:

Ultra-pure water that has undergone multiple reverse osmosis processes

De-ionized water

Demineralized water

Danfoss PAHT pumps are positive displacement pumps, with axial pistons that move a fixed amount of water in each cycle. Flow is proportional to the number of input shaft revolutions

(rpm). Unlike centrifugal pumps, they produce the same flow at a given speed independently of no matter what the discharge pressure.

2

521B1247 / DKCFN.PD.012.M5.02 / 07.2016

Data sheet PAHT 2-308 pumps

Below sectional drawing is an example of a PAHT pump.

1: Mounting flange

2: Shaft seal

3: Connecting flange

4: Port plate

5: Valve plate

6: Retainer plate

7: Swash plate

8: End cap

9: Spring

10: Piston

11: Cylinder barrel

12: Housing with bearing

2. Benefits

•

•

- Oil lubricants are replaced with the pumped medium, water, so there is no

• contamination risk from the pump.

Low maintenance costs:

- Efficient design and all-stainless steel construction ensure exceptionally long

• lifetime. When Danfoss specifications are met, service intervals of up to 8,000 hours can be expected. Service is easy, and can be carried out on site due to the simple design and few parts.

Low energy costs:

- The highly efficient axial piston design provides the lowest energy consumption of any comparable pump on the market.

Easy installation:

- The lightest and most compact design available.

•

- Pump can be installed horizontally or vertically.

- No pulsation dampeners necessary due to extremely low-pressure pulsation.

- Powered by electric motors or combustion engines.

- Suitable for both boosted inlet pressure and water supply from a tank.

- No need for cooling circuits due to very high mechanical efficiency.

Certified quality:

- Fulfills the stringent hygiene requirements, VDI 6022, HACCP.

- Certificates:

ISO 9001, ISO 14001

API available on request

3. Application examples

•

•

•

High-pressure cleaning with ultra-pure water, as used in the manufacturing of flat-panel displays and many other electronic products.

High-pressure cleaning with ultra-pure water, as used in the manufacturing of parts for the automobile industry.

Adiabatic cooling systems to replace or supplement standard A/C systems in server rooms and factories.

•

•

•

Humidification in office buildings, electronic component manufacturing, dairies, greenhouses, etc.

Dust suppression and odor control systems, for example in paper, textile and wood production.

Reduction of NOx emissions in diesel engines and gas turbines.

• Gas turbine by inlet fogging and fuel wash

systems.

521B1247 / DKCFN.PD.012.M5.02 / 07.2016

3

Data sheet

4. Technical data

PAHT 2-308 pumps

4.1 PAHT 2-12.5

Pump size

Code number PAHT

Housing material

Geometric displacement

cm³/rev in³/rev

Pressure

Min. outlet pressure barg psig

Max. outlet pressure

Inlet pressure, continuous

Max. inlet

1) pressure, peak barg psig barg psig barg psig

2

AISI 304

2

0.12

30

435

100

1450

0-4

0-58

4

58

3.2

AISI 304

3.2

0.20

Speed

Min. speed

Min. speed, continuous rpm rpm

1000

1000

1000

1000

Max. speed rpm 3000

Typical flow - Flow curves available in section 5

3000

1000 rpm at max. pressure

1500 rpm at max. pressure l/min l/min

0.7

1.7

2.0

3.6

30

435

100

1450

0-4

0-58

4

58

4

AISI 304

4

0.24

30

435

100

1450

0-4

0-58

4

58

1000

1000

3000

3.0

5.0

6.3

AISI 304

6.3

0.38

30

435

100

1450

0-4

0-58

4

58

1000

1000

3000

5.5

8.6

10

30

435

140

2031

0-4

0-58

4

58

12.5

180B0031 180B0077 180B0030 180B0029 180B0032 180B0033

AISI 304

10

0.61

1000

1000

2400

7.6

12.6

AISI 304

12.5

0.76

1000

1000

2400

10.2

16.5

30

435

140

2031

0-4

0-58

4

58

1200 rpm at max. pressure

1800 rpm at max. pressure

Media temperature

Ambient temperature

gpm gpm

Typical motor size

1500 rpm at max. pressure kW

50 Hz

1800 rpm at max. pressure

Torque at max. outlet pressure hp

60 Hz

Nm lbf-ft

°C

°F

°C

°F

Sound pressure level

2)

Weight

dB(A) kg lbs

0.3

0.6

0.75

1.0

4.4

3.2

2-50

37-122

0-50

32-122

76

4.4

9.7

0.7

1.2

1.1

1.5

6.7

4.9

2-50

37-122

0-50

32-122

76

4.4

9.7

1.0

1.6

1.5

2.0

8.1

6.0

2-50

37-122

0-50

32-122

76

4.4

9.7

1.8

2.7

2.2

3.0

12.4

9.2

2-50

37-122

0-50

32-122

76

4.4

9.7

2.5

4.0

4.0

7.5

25.6

18.9

2-50

37-122

0-50

32-122

75

7.7

17.0

3.3

5.3

5.5

7.5

31.7

23.4

2-50

37-122

0-50

32-122

75

7.7

17.0

4

1)

1% per minute peak, 10% per minute during start up.

2)

Measurements according to EN ISO 3744: 2010 / dB(A) [L

PA, 1m

Measured at max pressure and rpm for a motor pump unit.

] values are calculated.

521B1247 / DKCFN.PD.012.M5.02 / 07.2016

Data sheet PAHT 2-308 pumps

4.2 PAHT 20-32

Pump size

Code number PAHT

Housing material

Geometric displacement

cm³/rev in³/rev

20 25 32

180B0019 180B0020 180B0021

AISI 316 or higher

AISI 316 or higher

AISI 316 or higher

20

1.22

25

1.53

32

1.95

Pressure

Min. outlet pressure

Max. outlet pressure barg psig barg psig

30

435

100

1450

30

435

160

2321

Inlet pressure, continuous

Max. inlet

1) pressure, peak

2) barg psig barg psig

0-6

0-87

20

290

Speed

Min. speed

1500 rpm at max pressure

1200 rpm at max. pressure rpm l/min gpm

700 700

Min. speed, continuous

Max. speed rpm 1000 rpm 2400

Typical flow - Flow curves available in section 5

1000 rpm at max pressure l/min 16.9

1000

2400

20.6

27.0

5.4

33.2

6.7

0-6

0-87

20

290

700

1000

2400

28.0

44.2

9.0

30

435

160

2321

0-6

0-87

20

290

1800 rpm at max. pressure

Typical motor size

1500 rpm at max. pressure kW

50Hz

1800 rpm at max. pressure

Torque at max. outlet pressure gpm hp

60Hz

Nm lbf-ft

Media temperature

Ambient temperature

°C

°F

°C

°F dB(A)

Sound pressure level

3)

Weight

kg lbs

8.6

5.5

7.5

21.0

15.5

2-50

37-122

0-50

32-122

79

19

42

10.6

11.0

20.0

69.2

51.1

2-50

37-122

0-50

32-122

79

19

42

14.0

15.0

20.0

79

19

42

89.0

65.7

2-50

37-122

0-50

32-122

1)

2)

Above 1800 rpm inlet pressure 2-6 barg

1% per minute peak, 10% per minute during start up.

3)

Measurements according to EN ISO 3744: 2010 / dB(A) [L

PA, 1m

Measured at max pressure and rpm for a motor pump unit.

] values are calculated.

521B1247 / DKCFN.PD.012.M5.02 / 07.2016

5

Data sheet

6

PAHT 2-308 pumps

4.3 PAHT 50-90

Pump size

Code number PAHT

Housing material

Geometric displacement

cm³/rev in³/rev

50 63 70 80 90

180B0085 180B0086 180B0087 180B0088 180B0089

AISI 316 or higher

AISI 316 or higher

AISI 316 or higher

AISI 316 or higher

AISI 316 or higher

50

3.05

63

3.84

70

4.27

80

4.88

90

5.49

Pressure

Min. outlet pressure

Max. outlet pressure barg psig barg psig

30

435

80

1160

30

435

160

2321

Inlet pressure, continuous

1500 rpm at max. pressure

1200 rpm at max. pressure barg psig l/min gpm

0-6

0-87

0-6

0-87

Max. inlet

1) pressure, peak barg psig

20

290

Speed

Min. speed

Min. speed, continuous

Max. speed rpm rpm

700

1000 rpm 1800

Typical flow - Flow curves available in section 5

1000 rpm at max. pressure l/min 43.7

20

290

700

1000

1800

50.5

68.7

14.0

82.1

16.4

30

435

160

2321

0-6

0-87

20

290

700

1000

1800

57.7

92.9

18.7

30

435

160

2321

0-6

0-87

20

290

700

1000

1800

68.3

108.5

21.9

700

1000

1800

77.6

122.6

24.9

30

435

160

2321

0-6

0-87

20

290

1800 rpm at max. pressure

Typical motor size

1500 rpm at max. pressure kW

50 Hz

1800 rpm at max. pressure

Torque at max. outlet pressure gpm hp

60 Hz

Nm lbf-ft

Media temperature

Ambient temperature

°C

°F

°C

°F

Sound pressure level

2)

Weight

dB(A) kg lbs

21.8

11

20

68.5

50.6

2-50

37-122

0-50

32-122

80

34

75

26.3

30

50

172.6

127.4

2-50

37-122

0-50

32-122

80

34

75

29.6

30

50

191.8

141.5

2-50

37-122

0-50

32-122

80

34

75

34.5

37

60

219.8

162.2

2-50

37-122

0-50

32-122

80

34

75

38.9

45

75

246.6

182.0

2-50

37-122

0-50

32-122

81

34

75

1)

2)

1% per minute peak, 10% per minute during start up.

Measurements according to EN ISO 3744: 2010 / dB(A) [L

PA, 1m

] values are calculated.

Measured at max pressure and rpm for a motor pump unit.

521B1247 / DKCFN.PD.012.M5.02 / 07.2016

Data sheet PAHT 2-308 pumps

4.4 PAHT 256-308

Pump size

Code number PAHT

Housing material

Geometric displacement

cm³/rev in³/rev

256 308

180B1001 180B1002

AISI 316 or higher

AISI 316 or higher

256

15.6

308

18.8

Pressure

Min. outlet pressure

Max. outlet pressure barg psig barg psig

30

435

120

1740

30

435

120

1740

Inlet pressure, continuous

Max inlet pressure, peak

1)

barg psig barg psig

2-6

29-87

15

218

2-6

29-87

15

218

Speed

Min. speed

1250 rpm at max. pressure

450 rpm at max. pressure rpm l/min gpm

450 450

Min. speed, continuous

Max. speed rpm 700 700 rpm 1250 1250

Typical flow - Flow curves available in section 5

450 rpm at max. pressure l/min 89.6

107.8

294.4

23.3

354.2

28.0

1250 rpm at max. pressure

Typical motor size

1000 rpm at max. pressure kW

50 Hz

1200 rpm at max. pressure

Torque at max. outlet pressure gpm hp

60 Hz

Nm lbf-ft

Media temperature

Ambient temperature

°C

°F

°C

°F

Sound pressure level

2)

Weight

dB(A) kg lbs

76.5

55

100

549.6

405.6

2-50

37-122

0-50

32-122

82

105

231

92.1

75

125

87

105

231

661.3

448.0

2-50

37-122

0-50

32-122

1)

2)

1% per minute peak, 10% per minute during start up.

Measurements according to EN ISO 3744: 2010 / dB(A) [L

PA, 1m

] values are calculated.

Measured at max pressure and rpm for a motor pump unit.

521B1247 / DKCFN.PD.012.M5.02 / 07.2016

7

Data sheet

5. Flow

8

PAHT 2-308 pumps

The flow (Q eff

) at various pressure (p max calculated with the following equation:

) can be

Q eff

= Q

(th)

– [(Q

(th)

– Q (p max

)) x (p / p max

)]

The theoretical flow can be calculated with the following equation:

Q

(th)

=

V x n

1000

At zero pressure the true flow equals the theoretical flow Q

(th)

.

Q

Q (p p p:

V: n:

(th) max

: max

Theoretical flow (l/min / gpm)

): Flows at max. pressure (l/min and gpm), see 4.1-4.4

: Max pressure (barg / psig)

Pressure (barg / psig)

Displacement (cm

3

/ rev.)

Motor speed (rpm)

20

PAHT 6.3

PAHT 6.3

PAHT 4.0

PAHT 3.2

PAHT 4.0

2

10

00

0

10

00

12

50

12

50

15

00

15

00

17

50

17

50

20

00

20

00

22

50

22

50

25

00

25

00

27

50

27

50

30

00

rpm

30

00

PAHT 2.0

rpm gpm

5.0

4.0

3.0

3.5

2.5

3.0

2.0

5.0

4.0

4.5

3.5

2.5

1.5

2.0

1.0

1.5

0.5

1.0

0

0.5

10

00

0

12

50

15

00

17

50

17

50

20

00

20

00

22

50

22

50

25

00

25

00

PAHT 6.3

PAHT 6.3

PAHT 4.0

27

50

27

50

PAHT 2.0

rpm

30

00

rpm

30

00

Data sheet PAHT 2-308 pumps

5.2 PAHT 10-12.5 typical flow curves at max pressure l/min

12

00

14

00

20

00

22

00

12

00

14

00

20

00

22

00

521B1247 / DKCFN.PD.012.M5.02 / 07.2016

9

Data sheet PAHT 2-308 pumps

5.3 PAHT 20-32 typical flow curves at max pressure l/min l/min

80

70

70

40

40

30

30

60

60

50

50

20

20

10

10

0

0

70

0

70

0

95

95

0

0

12

12

00

00

14

14

50

50

17

00

17

00

19

50

19

50

22

00

22

00

24

24

00

00

rpm rpm

PAHT 32

PAHT 32

PAHT 25

PAHT 25

PAHT 20

PAHT 20

15

15

10

10

5

5

gpm gpm

25

20

20

0

0

70

0

70

0

95

95

0

0

12

12

00

00

14

14

50

50

17

00

17

00

19

50

19

50

22

22

00

00

24

24

00

00

PAHT 32

PAHT 32

PAHT 25

PAHT 25

PAHT 20

PAHT 20

10

521B1247 / DKCFN.PD.012.M5.02 / 07.2016

Data sheet PAHT 2-308 pumps

5.4 PAHT 50-90 typical flow curves at max pressure

70

0

95

0

14

50

17

00

18

00

70

0

95

0

14

50

17

00

18

00

521B1247 / DKCFN.PD.012.M5.02 / 07.2016

11

Data sheet PAHT 2-308 pumps

5.5 PAHT 256-308 typical flow curves at max pressure l/min

400

350

150

100

100

50

50

0

350

300

300

250

250

200

200

150

0

45

0

45

0

55

55

0

0

65

0

65

0

75

0

75

0

85

0

85

0

PAHT 308

PAHT 308

PAHT 256

PAHT 256

95

0

95

0

10

50

10

50

11

50

11

50

12

50

12

50

rpm rpm gpm

50

40

40

30

70

60

60

50

30

20

20

10

10

0

0

100

90

90

80

80

70

45

0

45

0

55

0

55

0

65

0

65

0

75

0

75

0

85

0

85

0

95

0

95

0

10

50

10

50

11

50

11

50

12

50

12

50

rpm rpm

PAHT 308

PAHT 308

PAHT 256

PAHT 256

12

521B1247 / DKCFN.PD.012.M5.02 / 07.2016

Data sheet

6. Motor requirements

PAHT 2-308 pumps

The required motor power can be calculated by using the following equation:

P = n x V x p

600.000 x η

P: Power (kW)

M: Torque (Nm)

η: Mechanical efficiency p: Pressure (barg) n: Motor speed (rpm)

V: Displacement (cm

3

/rev.)

From the flow curves in item 5, you can determine the rpm of the pump at the desired flow.

The required torque is calculated as follows:

M =

V x p

62.8 x η

To determine the correct motor size, both the power and torque requirement must be verified.

The mechanical efficiency of the pump, at max pressure, is as follows:

PAHT 2, 3.2, 4, 6.3

PAHT 10, 12.5

PAHT 20, 25, 32, 50, 63, 70, 80, 90

PAHT 256, 308

0.8

0.9

0.95

0.95

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Data sheet

7. Installation

PAHT 2-308 pumps

See the figure below for instructions on how to mount the pump and connect it to an electric motor or combustion engine.

14

A B C D

A: Pump

B: Bell housing

C: Coupling

D: Motor

If alternative mounting is required, please contact your Danfoss sales representative for further information.

Note: Do not add any axial or radial loads to the pump shaft.

7.1 Filtration

Proper filtration is crucial for the performance, maintenance and warranty of your pump.

Protect your pump, and the application in which it is installed, by always ensuring that filtration specifications are met, and by always changing filter cartridges according to schedule.

Since water has very low viscosity, Danfoss PAHT pumps have been designed with very narrow clearances in order to control internal leakage rates and improve component performance.

To minimize wear on the pump, it is therefore essential to filter inlet water properly.

The main filter must have a filtration efficiency of 99.98% at 10 μm. We strongly recommend that you always use precision depth filter cartridges rated 10 μm abs. β

10

≥

5,000.

Please note that

we do not recommend bag filters or string-wound filter cartridges

, which typically have only 50% filtration efficiency. This means that out of 100,000 particles that enter such filters, 50,000 particles pass right through them; compare this to precision depth filters that are 99.98% efficient, and only allow 20 of the same 100,000 particles to pass through.

For more information on the importance of proper filtration, including explanation of filtration principles, definitions, and guidance on how to select the right filter for your pump, please consult our

Filtration

information and specifications (Danfoss document number

521B1009).

7.2 Noise

Since the pump unit is mounted on a frame, the overall noise level can only be determined for a complete system. To minimize vibrations and noise throughout the system, it is therefore very important to mount the pump unit correctly on a frame with dampers and to use flexible hoses rather than metal pipes where possible.

The noise level is influenced by:

• Pump speed:

High rpm makes more fluid/structure-

•

borne pulsations/vibrations than low rpm.

Discharge pressure:

High pressures make more noise than low pressures.

•

•

•

Pump mounting:

Rigid mounting makes more noise than flexible mounting because of the structureborne vibrations. Be sure to use dampers when mounting.

Connections to pump:

Pipes connected directly to the pump make more noise than flexible hoses because of structure-borne vibrations.

Variable frequency drives (VFDs):

Motors regulated by VFDs can produce more noise if the VFD does not have the right settings.

521B1247 / DKCFN.PD.012.M5.02 / 07.2016

Data sheet PAHT 2-308 pumps

7.3 Open-system design

A Inlet line:

Dimension the inlet line to obtain minimum pressure loss (large flow, minimum pipe length, minimum number of bends/ connections, fittings with small pressure losses and restrictions).

B Inlet filter:

Install the inlet filter (1) in front of the PAHT pump (2). Please consult the Danfoss filter data sheet for guidance on how to select the right filter.

C Monitoring pressure switch:

Install the monitoring pressure switch (3) between the filter and the pump inlet. Set the minimum inlet pressure according to specifications described in item 4, technical data. The monitoring pressure switch stops the pump if inlet pressure is lower than the set minimum pressure.

D Monitoring temperature switch:

Install the monitoring temperature switch

(4) between the filter and the pump, on either side of the monitoring pressure switch. Set the temperature value according to technical data, item 4. The monitoring temperature switch stops the pump if inlet temperature is higher than the set value.

E

F

Hoses:

Always use flexible hoses (5) to minimize vibrations and noise.

Inlet pressure:

In order to eliminate the risk of cavitation and other pump damage, pump inlet pressure must be maintained according to specifications described in item 4, technical data.

G Non-return valve (6):

Should be installed after the outlet to prevent pump backspin, which may ruin the pump.

H Pressure relief valve:

As the Danfoss PAHT pump begins to create pressure and flow immediately after start-up regardless of any counter pressure, a pressure relief valve (7) should be installed to prevent system damage.

Note: If a non-return valve is mounted in the inlet line, a low-pressure relief valve is also recommended between the non-return valve and the pump to protect against high-pressure peaks.

4

2

1

PI

PI

System

5

6

3

5

7

11

2

4

Reservoir

1

PI

6

3

5

6 7

PI

521B1247 / DKCFN.PD.012.M5.02 / 07.2016

System

9

10

8

15

Data sheet PAHT 2-308 pumps

7.4 Closed-system design (not applicable for PAHT 256-308)

A Inlet line:

Dimension the inlet line to obtain minimum pressure loss (large flow, minimum pipe length, minimum number of bends/ connections, fittings with small pressure losses and restrictions).

B Inlet filter:

Install the filter (1) in front of the tank (2).

Please consult the Danfoss filter data sheet for guidance on how to select the right filter.

C Monitoring pressure switch:

Install the monitoring pressure switch (3) in front of the filter (1). Set the maximum inlet pressure to 2 barg (29.0 psig). The monitoring pressure switch will stop the pump (5) if inlet pressure is higher than 2 barg (29.0 psig), indicating that the filter element must be changed.

D Monitoring temperature switch:

Install the monitoring temperature switch

(4) in the tank. Set the temperature value according to technical data, item 4. The monitoring temperature stops the pump if inlet temperature is higher than the set value.

E Hoses:

Always use flexible hoses (6) to minimize vibrations and noise.

F Inlet pressure:

In order to eliminate the risk of cavitation and other pump damage, pump inlet pressure must be maintained according to specifications described in item 4, technical data.

G Non-return valve (7):

Should be installed after the outlet to prevent pump backspin, which may ruin the pump.

H Pressure relief valve:

As the Danfoss PAHT pump begins to create pressure and flow immediately after start-up regardless of any counter pressure, a pressure relief valve (8) should be installed to prevent system damage.

System water filling: I

To ensure proper filtration of new water

(10) supplied to the system, always use the filling valve (9).

J Minimum level switch:

Install the minimum level switch (11) above the outlet of the reservoir. The level switch must stop the pump if the water in the reservoir is below the switch, which indicates that the reservoir is empty.

PI

3

4

5

2

5

PI

7

6

System

2

11 4

Reservoir

PI

6

5

6

PI

7

System

1

9

10

3

8

16

521B1247 / DKCFN.PD.012.M5.02 / 07.2016

Data sheet

8. Dimensions and connections

PAHT 2-308 pumps

8.1 PAHT 2-6.3

521B1247 / DKCFN.PD.012.M5.02 / 07.2016

17

Data sheet

8.2 PAHT 10-12.5

PAHT 2-308 pumps

18

521B1247 / DKCFN.PD.012.M5.02 / 07.2016

Data sheet

8.3 PAHT 20

PAHT 2-308 pumps

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Data sheet

8.4 PAHT 25-32

PAHT 2-308 pumps

20

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Data sheet

8.5 PAHT 50-90

PAHT 2-308 pumps

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Data sheet

8.6 PAHT 256-308

PAHT 2-308 pumps

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521B1247 / DKCFN.PD.012.M5.02 / 07.2016

Data sheet

9. Service

PAHT 2-308 pumps

Danfoss PAHT pumps are designed for long periods of service-free operation to ensure low maintenance and life cycle costs. Provided that the pump is installed and operated according to

Danfoss specifications, Danfoss PAHT pumps typically run 8,000 hours between service.

However, the service schedule for your Danfoss

PAHT pump may vary according to the application and other factors.

The life of a pump may be greatly shortened if

Danfoss recommendations concerning system design and operation are not followed.

In our experience, poor filtration is the number one cause of pump damage.

•

•

•

•

Other factors that affect pump performance and lifetime include:

running the pump at speeds outside specifications

supplying the pump with water at temperatures higher than recommended

running the pump at inlet pressures outside specifications

running the pump at outlet pressures outside the specifications.

We recommend that you inspect your pump after 8,000 hours of operation even if it is running without any noticeable problems.

Replace any worn parts if necessary, including pistons and shaft seals, to keep your pump running efficiently and to prevent breakdown. If worn parts are not replaced, then our guidelines recommend more frequent inspection.

521B1247 / DKCFN.PD.012.M5.02 / 07.2016

23

Danfoss A/S

High Pressure Pumps

DK-6430 Nordborg

Denmark

Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice.

This also applies to products already on order provided that such alterations can be made without subsequential changes being necessary in specifications already agreed.

All trademarks in this material are property of the respective companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.

© Danfoss | DCS (IM) | 2016.07

521B1247 | DKCFN.PD.012.M5.02 | 24