The Alfa Laval SRU Rotary Lobe Pump is a reliable positive displacement pump for the gentle handling of sensitive process fluids. The pump is carefully engineered to provide reliable performance, trouble-free operation and superior energy efficiency for demanding applications. It is an excellent choice for duties that require contamination-proof pumps to meet high standards of hygiene, low-shear and low-pulsation operation. The pump is designed according to the most stringent hygienic design standards and with verified, effective Cleaning-in-Place.
The SRU Rotary Lobe Pump is designed for gentle handling of sensitive process fluids across the dairy, food, beverage, brewing, chemical, pharmaceutical, and home and personal care industries. Its smooth, low-shear pumping action makes the pump suitable for handling media of varying viscosities, whether low or high-from creams, gels, emulsions, and aerated mixtures to delicate cells and organic solids in suspension. The SRU Rotary Lobe Pump is available with 12 different pump head displacements based on six different gearbox modules to handle flow rates up to 106 m3/h and differential pressures up to 20 bar.
The standard Alfa Laval SRU Rotary Lobe Pump has tri-lobe rotors. Optional bi-lobe rotors for handling fluids containing large delicate solids are available. All rotors are available in three temperature ratings enabling the pump to be operated at maximum process temperatures of 70°C, 130°C and 200°C for both fluid pumped and CIP.
Dimensions
Horizontally ported
A1 - denotes hygienic port dimension
A2 - denotes enlarged port dimension
Vertically ported
A1 - denotes hygienic port dimension
A2 - denotes enlarged port dimension
TECHNICAL DATA
Standard specification
- Product wetted steel parts: W. 1.4404 (316L)
- Inside surface finish: Mech Ra ≤ 0.8
- Gearbox: Cast iron
- Base plate: Stainless steel
- Coupling guard: Stainless steel
- Rotor: Tri-lobe, 70°C
- Product wetted elastomers: EPDM
- Other elastomers: NBR
- Shaft seal: Single mechanical (R90)
- Rotary seal face: Carbon
- Stationary seal face: Stainless steel
Shaft seals
- Single, single flush, double mechanical and packed gland, flushed and unflushed, available. For EHEDG compliance Hyclean type must be used.
- Max flush pressure, single flush: 0.5 bar
- Max flush pressure, double mechanical: 1 bar over product pressure
- Max flush pressure, packed gland, flushed: 1 bar over product pressure
- Water consumption, flushed or double mechanical: 0.5 l/min
- Flush connections: BSPT or NPT
Temperature
- Max process and CIP temperature (dependent on rotor selection) 70°C, 130°C or 200°C
Motor
- Gear motor, 4 poles, to IEC metric standard, 50/60 Hz, suitable for frequency conversion, IP55, insulation class F.
Flows/Pressures/Connections
L - Horizontal Porting
H - Vertical Porting
S - Stainless Steel
D - Duplex Stainless Steel
Shaft Seal Options
• Single or single flush/quench. R90 or Hyclean type mechanical seals.
• Double R90 type mechanical seal for flush (steam barrier for aseptic application).
• Packed gland (unflushed or flushed versions). Note: EHEDG compliance only for Hyclean type mechanical seals.
Materials for Mechanical Seals
Carbon/Stainless steel, Tungsten Carbide/Tungsten Carbide, Silicon Carbide/Silicon Carbide or variations of these materials to suit fluid being pumped and/or application requirements. (N.B. Material variants are not available on all R90/Hyclean seal types)
Pump Sizing
In order to correctly size a rotary lobe pump some essential information is required. Provision of this information listed below enables our Technical Support personnel to obtain the 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
• Specification of inlet and outlet ports (Screwed male to BSP, DIN11851, SMS. ISS/IDF, RJT, or Flanged to EN1092-1 B1 PN16, ASA/ANSI 150,
BS10E and other standards).
• Rotorcase Cover with integral Pressure Relief Valve.
• Heating/Cooling Saddle Jackets for Rotorcase and Jacket for Rotorcase Cover (not available when relief valve fitted).
• Bi-lobe Rotors in stainless steel and non-galling alloy.
• Full material traceability on request to BS EN10204 3.1.
• ATEX compliance.
• Complete pump unit comprising: Pump + Baseplate (mild or stainless steel) + coupling with guard + Geared electric motor suitable for (or supplied with) frequency speed control or manual variable speed drive (advise motor enclosure and electrical supply).
Glyanec