Sanitary Screw Pump

Sanitary Screw Pump

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Our Screw Pump (available as a Double Screw) is Self Priming and has been produced specifically for hygienic and sanitary applications within the food, chemical and pharmaceutical industries. The Screw Pump is entirely machined from cast Stainless Steel AISI 316L with a surface roughness of ❬0.8 as standard (❬0.5 on request) to provide increased corrosion resistance. Competitors units employ a cast iron gear box with epoxy paint which can become eroded over time and need replacing/repairing. The pump shafts are constructed from Duplex Stainless Steel 1.4462 to provide extra rigidity in operation and the pump can be fitted with a number of different sealing options and elastomer materials to suit almost any application. The Double Screw Pump design is a combination of all the best advantages of Lobe, Hose, Centrifugal & Circumferential Piston Pumps. The result is an incredibly versatile and robust pump which can be used for a plethora or a combination of applications within enumerative industries.

Our Screw Pump (available as a Double Screw) is Self Priming and has been produced specifically for hygienic and sanitary applications within the food, chemical and pharmaceutical industries. The Screw Pump is entirely machined from cast Stainless Steel AISI 316L with a surface roughness of ❬0.8 as standard (❬0.5 on request) to provide increased corrosion resistance. Competitors units employ a cast iron gear box with epoxy paint which can become eroded over time and need replacing/repairing. The pump shafts are constructed from Duplex Stainless Steel 1.4462 to provide extra rigidity in operation and the pump can be fitted with a number of different sealing options and elastomer materials to suit almost any application. The Double Screw Pump design is a combination of all the best advantages of Lobe, Hose, Centrifugal & Circumferential Piston Pumps. The result is an incredibly versatile and robust pump which can be used for a plethora or a combination of applications within enumerative industries.

Technical data
Max Capacity: 95 m³/hr
Max Pressure: 16 Bar
Max Viscosity: 1’000’000 cPs
Max Temperature: 140ºC
Max Solids Passage: 60 mm – Model & Screw Type Specific
Connections: 2” – 5” (DN50 – 125)
Connection Types: Hygienic Threads DIN 11851, DIN11864-1& 2, SMS 1145 Flanges acc. To EN1092 Tri-Clamp: ISO 2852 & DIN 32676 BSP & NPT Threaded Rectangular Ported Client Specific
Shaft Sealing: Single, double quench/flush or Lip Seal
Sealing Materials: SiC / SiC or Tungsten / Tungsten
Elastomer Materials: EPDM, Viton, NBR, Teflon, KALREZ, e.g. according to FDA
Wetted Parts: AISI 316L (AISI 316L Mo Ni or Hastelloy CX2MW N26022 upon request)
Surface Roughness: ❬0.8 Micron (Std.), ❬0.5 upon request (Mechanical & Electro-Polished)
Hardening: Hard Inchromizing & Plasma Nitriding (Optional)
Drives: Standard: IEC, IE2, B3/B5, IP55, isol cl. F, PTC Optional: IE3, ATEX, noise reduction
Capacity range
Data PDSP 2 PDSP 3 PDSP 4 (Coming Soon!)
Max Differential Pressure: 16 Bar 16 Bar 16 Bar
Max Flow: 40 m³/hr 95 m³/hr 140 m³/hr
Max Speed: 3600 rpm 3600 rpm 3600 rpm
Max Temperature: 140ºC 140ºC 140ºC
Max Viscosity: 1’000’000 cPs 1’000’000 cPs 1’000’000 cPs
Free Passage: 20 mm 30 mm 40 mm
NPSHr: ❬2 m ❬2 m ❬2 m

 

Pump type Pomac PDSP Twin Lobe Circumferential Piston Tri Lobe Progressive Cavity
Hygienic +++ + +- +-
Suction capability +++ ++ ++ + +++
Pressure +++ +++ +++ + +++
Dry running ++ + +
Gentle handling soft solids ++ +- +- ++ ++
Maintenance +++ +- +-
Share rate ++ + + ++
CIP Capability +++ +- +-
Operating principle

Our Screw Pump is a type of Rotary Positive Displacement Pump available with a double screw. Its operation is based on the counter rotation of 2 screws or rotors in the pump casing. Both screws are mounted onto their own shafts which are supported by bearing cartridges mounted directly onto the pump casing. One of the pump shafts is externally driven and an internal gear assembly drives the other shaft in the opposing direction. The screws rotate synchronously in opposing directions without touching.

Sanitary Screw Pumps. Operating principle

When the screws rotate and pass the suction port the volume between them increases and creates a vacuum which causes liquid to enter the suction port and the pump casing. During the rotation of the screws the fixed amount of fluid is conveyed through the pump. As the screws approach the discharge port the volume between them decreases which creates a pressure build-up, causing the fluid to flow out of the discharge port.

Mechanical seal

Single Mechanical Seal
Single Mechanical Seal: EHP-PDSP
Single Mechanical Seal with Quench or Flush: EHP-PDSP and Lip seal to 16 Bar

Sanitary Screw Pumps. Single Mechanical Seal

Double Mechanical Seal
Double Mechanical Seal: PP-PDSP
Double Mechanical Seal with Quench or Flush: PP-PDSP and PA-PDSP to 16 Bar

Sanitary Screw Pumps. Double Mechanical Seal

  • Technical data

  • Capacity range

  • Operating principle

  • Mechanical seal

Max Capacity: 95 m³/hr
Max Pressure: 16 Bar
Max Viscosity: 1’000’000 cPs
Max Temperature: 140ºC
Max Solids Passage: 60 mm – Model & Screw Type Specific
Connections: 2” – 5” (DN50 – 125)
Connection Types: Hygienic Threads DIN 11851, DIN11864-1& 2, SMS 1145 Flanges acc. To EN1092 Tri-Clamp: ISO 2852 & DIN 32676 BSP & NPT Threaded Rectangular Ported Client Specific
Shaft Sealing: Single, double quench/flush or Lip Seal
Sealing Materials: SiC / SiC or Tungsten / Tungsten
Elastomer Materials: EPDM, Viton, NBR, Teflon, KALREZ, e.g. according to FDA
Wetted Parts: AISI 316L (AISI 316L Mo Ni or Hastelloy CX2MW N26022 upon request)
Surface Roughness: ❬0.8 Micron (Std.), ❬0.5 upon request (Mechanical & Electro-Polished)
Hardening: Hard Inchromizing & Plasma Nitriding (Optional)
Drives: Standard: IEC, IE2, B3/B5, IP55, isol cl. F, PTC Optional: IE3, ATEX, noise reduction

Performance curves