SRU Rotary Lobe Pump PD 66342 US1 2001-07

Proven Performance and Reliability

ApplicationThe SRU range of rotary lobe pumps has been designedfor use on wide ranging applications within the Brewing,Dairy, Food, Pharmaceutical and Chemical industries. TheSRU pump can handle low to high viscosity media, issuitable for CIP (Cleaning In Place), and conforms to USA3A Sanitary Standard. The characteristic smooth, lowshear pumping action is ideal for products such as creams,gels, emulsions, aerated mixtures, delicate cells andorganic solids in suspension.

The SRU range is compact in size and highly efficient,capable of flow rates up to 466 gpm and pressures up to290 psi. The new improved modular design provides forgreater application flexibility and cost effective easymaintenance.

Standard DesignPump GearboxThe SRU pump with its conventional lobe pump designconcept has a robust cast iron gearbox, which providesmaximum shaft rigidity and easy oil seal replacement. TheSRU range in series 1-4 has a universal gearbox design.This gives the flexibility of mounting pumps with the inletand outlet ports in either a vertical or horizontal plane bychanging the foot position. The SRU range in series 5 & 6has dedicated gearbox castings, which also allows the inletand outlet ports to be in either the vertical or horizontalplane. A quality epoxy paint system is used on the gearboxexterior for optimum protection against natural and corro-sive elements.

Pumphead ConstructionThe SRU in standard specification has sanitary design fullbore inlet and outlet ports to International Standards, maximiz-ing inlet and outlet port efficiency and NPSH characteristics.Enlarged diameter and rectangular ports are also available tohandle very high viscosity products.

SRU Rotary Lobe Pump

The SRU in standard specification has tri-lobe rotors withthe option of bi-lobe rotors for handling fluids containinglarge delicate solids. All rotors are available in threetemperature ratings allowing the pump to be operated atmaximum process temperatures of 158°F, 266°F and 392°Ffor both fluid pumped and CIP.

SRU Rotary Lobe Pump PD 66342 US1 2001-10

The Optimum Choice for Ultra-Clean Processes

Max. size of spherical solids (in.)

Tri-lobe rotors

.24

.24

.24

.35

.35

.43

.43

.59

.59

.71

.71

.94

Bi-lobe rotors

.31

.31

.31

.51

.51

.63

.63

.87

.87

1.06

1.06

1.46

SRU1/005

SRU1/008

SRU2/013

SRU2/018

SRU3/027

SRU3/038

SRU4/055

SRU4/079

SRU5/116

SRU5/168

SRU6/260

SRU6/353

Maximum Solid Size Capability

Materials of ConstructionPump gearbox – high quality grey cast iron.Pumphead – product wetted components in 316L orequivalent stainless steel.Product wetted elastomers of EPDM, NBR, FPM all FDAconforming. Also PTFE for chemical applications.

Weight

Model Bare Shaft Pump (lbs.)Horizontal porting Vertical porting

SRU1/005 33 35SRU1/008 37 40SRU2/013 62 66SRU2/018 64 68SRU3/027 117 123SRU3/038 123 130SRU4/055 231 245SRU4/079 243 256SRU5/116 335 335SRU5/168 353 353SRU6/260 573 573SRU6/353 584 584

Shaft Seal Options- Single or single flush/quench (steam barrier for aseptic

application) R90 or Hyclean type mechanical seals.- Double R90 type mechanical seal for flush.- Packed gland (unflushed or flushed versions).

Materials for Mechanical SealsCarbon/Stainless steel, Tungsten Carbide/TungstenCarbide, Silicon Carbide/Silicon Carbide or variations ofthese materials to suit fluid being pumped and/or applica-tion requirements. (N.B. Material variants are not availableon all R90 or Hyclean seal types)

Pump SizingIn order to correctly size a rotary lobe pump some essentialinformation is required. Provision of this information listedbelow enables our Customer Support personnel to obtainthe optimum pump selection.

Product/Fluid Data- Fluid to be pumped- Viscosity- SG/Density- Pumping temperature, minimum, normal and

maximum- Cleaning in Place temperature(s), minimum, normal and

maximum

Performance Data- Flow rate, minimum, normal and maximum- Discharge head/pressure (closest to pump outlet)- Suction condition

Standard Specification Options- Tri-clamp inlet and outlet ports standard- Specification of inlet and outlet ports (Screwed male to

BSP, DIN11851, Rdg, SMS. ISS/IDF, RJT, IAMD/3A, orFlanged to BS4504/DIN2533, ASA/ANSI 150, BS10E andother standards)

- Rotorcase Cover with integral Pressure Relief Valve- Heating/Cooling Saddle Jackets for Rotorcase and

Jacket for Rotorcase Cover (not available when relief valvefitted)

- Bi-lobe Rotors in stainless steel and non-galling alloy.- Electropolished product wetted components- Complete pump unit comprising: Pump + Stainless Steel

Baseplate + coupling with guard + Gearedelectric motor suitable for (or supplied with) frequencyspeed control or manual variable speed drive (advisemotor enclosure and electrical supply).

Fig. 1

Flows/Pressures/Connections

Note 1. These pressure ratings may vary for pumps with certain threaded connections.

1 3

3

005008

013013018018

027027038038

055055079079

116116168168

260260353353

L or HL or H

L or HL or HL or HL or H

L or HL or HL or HL or H

L or HL or HL or HL or H

L or HL or HL or HL or H

L or HL or HL or HL or H

DD

SDSD

SDSD

SDSD

SDSD

SDSD

SRU1/005/LD or HDSRU1/008/LD or HD

SRU2/013/LS or HSSRU2/013/LD or HDSRU2/018/LS or HSSRU2/018/LD or HD

SRU3/027/LS or HSSRU3/027/LD or HDSRU3/038/LS or HSSRU3/038/LD or HD

SRU4/055/LS or HSSRU4/055/LD or HDSRU4/079/LS or HSSRU4/079/LD or HD

SRU5/116/LS or HSSRU5/116/LD or HDSRU5/168/LS or HSSRU5/168/LD or HD

SRU6/260/LS or HSSRU6/260/LD or HDSRU6/353/LS or HSSRU6/353/LD or HD

Liters/rev

0.0530.085

0.1280.1280.1810.181

0.2660.2660.3840.384

0.5540.5540.790.79

1.161.161.681.68

2.602.603.533.53

Imp gal/100 rev

1.171.87

2.822.823.983.98

5.855.858.458.45

12.1912.1917.3817.38

25.5225.5236.9536.95

57.2057.2077.6577.65

US gal/100 rev

1.42.25

3.383.384.784.78

7.037.0310.1510.15

14.6414.6420.8720.87

30.6530.6544.3944.39

68.7068.7093.2693.26

mm

2525

25254040

40405050

50506565

65658080

100100100100

in

11

11

1.51.5

1.51.522

22

2.52.5

2.52.533

4444

mm

-40

40405050

50506565

65658080

8080100100

100100150150

in

-1.5

1.51.522

22

2.52.5

2.52.533

3344

4466

bar

85

1015710

1015710

1020715

1020715

1020715

psi

11575

145215100145

145215100145

145290100215

145290100215

145290100215

rev/min

10001000

1000100010001000

1000100010001000

1000100010001000

600600600600

500500500500

Pum

p he

ad C

ode

Gea

rbox

L -

Hor

izon

tal P

ortin

gH

- V

ertic

al P

ortin

g

Sha

ftS

- S

tain

less

Ste

elD

- D

uple

x S

tain

less

Ste

el Sanitary Enlarged

See Note 1

Working PrincipleThe positive displacement of the SRU pump is provided by non-contacting, rotating tri-lobe or bi-lobe rotors within a fullyswept pump chamber. All SRU pumps are capable of bi-rotational flow without modification.

42

1 42

1

2

3

4

5

6

SRU Build Selection SRUModel Displacement Inlet and Outlet Differential MaximumSeries Connection Size Pressure Speed

PD 66342 US1 2001-10 The information contained herein is correct at the time ofissue, but may be subject to change without prior notice.

How to contact Alfa LavalContact details for all countriesare continually updated on our website.Please visit www.alfalaval.com toaccess the information direct.

Dimensions

Horizontally ported

Vertically ported

A1

1.001.00

1.001.50

1.502.00

2.002.50

2.503.00

4.004.00

B

3.743.74

4.134.13

4.924.92

5.915.91

6.896.89

7.487.48

C

3.563.56

4.534.53

5.415.41

6.426.42

7.687.68

8.868.86

D

7.447.44

9.179.17

10.7510.75

12.8012.80

14.8014.80

16.8916.89

E

0.390.39

0.590.59

0.710.71

0.790.79

0.790.79

0.790.79

F

1616

2222

2828

3838

4545

4848

G

1.571.57

1.971.97

2.402.40

3.153.15

4.334.33

4.334.33

HB

2.682.68

3.353.35

3.943.94

4.534.53

5.315.31

6.106.10

HT

4.454.45

5.715.71

6.896.89

8.318.31

10.0410.04

11.6111.61

J

1.181.18

1.261.26

1.571.57

2.482.48

2.762.76

2.762.76

K

55

66

88

1010

1414

1414

L

11.2211.61

13.3513.70

17.2017.72

21.3021.97

24.6825.59

29.4530.59

M2

1.651.89

2.362.48

3.253.43

3.984.33

3.824.25

4.905.51

N

4.884.88

5.165.16

6.936.93

8.828.82

10.9810.98

10.4710.47

P

3.153.15

3.943.94

4.924.92

5.915.91

7.097.09

10.2410.24

Q

0.390.39

0.750.75

1.181.18

1.381.38

1.381.38

1.571.57

R

3.943.94

5.205.20

7.137.13

7.957.95

10.8310.83

14.5714.57

S

3.943.94

4.884.88

6.066.06

7.247.24

8.278.27

8.668.66

T

3.153.15

3.943.94

4.924.92

5.915.91

7.097.09

7.487.48

U

0.390.39

0.470.47

0.550.550.550.550.550.550.550.55

All dimensions in inches except where notedM1

1.811.99

2.502.62

3.413.72

4.294.65

4.174.61

5.305.79

A2

-1.50

1.502.00

2.002.50

2.503.00

3.004.00

4.006.00

PUMP

SRU1/005/LSRU1/008/L

SRU2/013/LSRU2/018/L

SRU3/027/LSRU3/038/L

SRU4/055/LSRU4/079/L

SRU5/116/LSRU5/168/L

SRU6/260/LSRU6/353/L

A1

1.001.00

1.001.50

1.502.00

2.002.50

2.503.00

4.004.00

B

3.743.74

4.134.13

4.924.92

5.915.91

6.896.89

7.487.48

C

4.454.45

5.795.79

6.896.89

8.398.39

10.1010.10

11.6111.61

D

8.198.19

9.929.92

11.8111.81

14.2914.29

16.9916.99

19.0919.09

E

0.590.59

0.590.59

0.870.87

0.980.98

1.181.18

1.181.18

F

1616

2222

2828

3838

4545

4848

G

1.571.57

1.971.97

2.402.40

3.153.15

4.334.33

4.334.33

J

1.181.18

1.261.26

1.571.57

2.482.48

2.762.76

2.762.76

K

55

66

88

1010

1414

1414

L

11.2211.61

13.3513.70

17.2017.72

12.3021.97

24.6825.59

29.4530.59

M1

2.092.26

2.782.89

2.813.13

3.393.74

3.964.41

5.285.75

N

4.614.61

4.884.88

6.346.34

7.767.76

10.3910.39

10.5110.51

P

3.153.15

3.943.94

6.106.10

7.877.87

7.877.87

10.2410.24

Q

0.870.87

0.470.47

0.590.59

0.670.67

0.790.79

0.790.79

R

4.494.49

4.884.88

7.287.28

9.219.21

9.459.45

11.8111.81

S

4.094.09

4.884.88

6.106.10

7.247.24

8.668.66

9.849.84

T

3.153.15

3.943.94

4.924.92

5.915.91

7.097.09

8.278.27

U

0.390.39

0.470.47

0.550.55

0.550.55

0.550.55

0.550.55

X

0.890.89

1.181.18

1.481.48

1.891.89

2.362.36

2.762.76

M2

1.932.17

2.642.76

2.662.83

3.073.43

3.604.06

4.885.47

V

7.057.05

8.628.62

9.969.96

12.0912.09

13.5813.57

15.7515.75

A2

-1.50

1.502.00

2.002.50

2.503.00

3.004.00

4.006.00

PUMP

SRU1/005/HSRU1/008/H

SRU2/013/HSRU2/018/H

SRU3/027/HSRU3/038/H

SRU4/055/HSRU4/079/H

SRU5/116/HSRU5/168/H

SRU6/260/HSRU6/353/H

(mm) (mm)

(mm) (mm)

All dimensions in inches except where noted

A1 denotes sanitary port dimensionA2 denotes enlarged port dimension

M1 denotes standard port dimension forsuperceded range.

M2 refers to enlarged or sanitary port.

A1 denotes sanitary port dimensionA2 denotes enlarged port dimension

M1 denotes standard port dimension forsuperseded range.

M2 refers to enlarged or sanitary port.