Seim PDA032#2AS1D05D0100 Triple Screw Pump

Seim PDA032#2AS1D05D0100 Triple Screw Pump

The SEIM PDA032#2AS1D05D0100 is a three-screw positive displacement pump engineered for low-pressure continuous circulation, lubrication, off-line filtration, and hydraulic cooling systems. Built around three intermeshing precision-ground helical rotors—a hardened steel power rotor driving two cast iron idler spindles—the unit displaces fluid axially inside a precision-machined aluminum alloy housing.

This continuous kinematic displacement produces smooth, laminar fluid transfer with negligible hydraulic pulsation, eliminating cavitation risk under steady operating parameters. The pump incorporates an internal mechanical shaft seal and an integrated bypass relief safety valve calibrated to safeguard circuits against downstream overpressurization.

Model Details

• Manufacturer: SEIM S.r.l. (Italy)
• Series: PDA Series (Three-Screw Pump with Integrated Safety Valve)
• Model Code: PDA032
• Manufacturer Part Number (MPN): PDA032#2AS1D05D0100
• Displacement / Frame Classification: Rotor Size 032
• Rotation Direction: Clockwise (CW), viewed from motor drive shaft end
• Internal Valve Setting: Factory-set at 6 bar (adjustable up to 10 bar bypass envelope)

Technical Details

Features

1. Continuous, Non-Pulsating Axial Delivery: Intermeshing spindle geometry moves fluid in sealed axial chambers, suppressing hydraulic chatter, pressure ripple, and operational noise (56–62 dB(A)).
2. Integrated Safety Bypass Valve: Features a built-in full-flow spring-loaded relief valve that protects piping, filter canisters, and motor windings during cold-viscosity pressure spikes.
3. High-Integrity Mechanical Shaft Sealing: Standardized mechanical face seal arrangement mounted via bell housing/lantern bracket, isolating motor shafts from high back-pressures and thermal expansion.
4. Multiphase Viscosity & Aerated Oil Tolerance: Tolerates entrained air and oil-emulsion conditions without dry-running seizure or loss of volumetric prime.
5. Corrosion-Resistant Structural Metallurgy: High-tensile aluminum alloy pump casing paired with a carbon/alloy steel driving spindle and self-lubricating pearlitic cast iron idler screws.

Pump Compatibility

• Cooler & Exchanger Packages: Standard circulating displacement unit on SEIM Air-Oil heat exchangers and Torin Drive / ZZIPCO hydraulic elevator oil coolers (Assembly Nethy#06M2TF00, motor USMOT#080N4S0M2).
• Marine Propulsion & Reduction Gears: Renk, Reintjes, ZF Marine, and Flender gearboxes requiring continuous low-pressure shaft and gear meshing spray lubrication.
• Auxiliary Marine Diesels: Auxiliary lube feed loops for Wärtsilä, MAN Energy Solutions, and Yanmar gen-sets.
• Compressors & Power Generation: Rotary screw compressors (Atlas Copco, Kaeser) and steam/gas turbine lube oil skids.
• Fluid Conditioning Systems: Stationary and mobile offline “kidney-loop” filtration skids (Pall, Hydac, Parker Hannifin).

Frequently Asked Questions

Can the SEIM PDA032 pump run dry during initial priming?

No. While positive-displacement screw pumps exhibit self-priming capabilities under flooded or mild suction-lift conditions, they depend entirely on the pumped fluid to lubricate the contact zones between the driving rotor and idler screws. Running dry will gall the contact flanks of the pearlitic cast iron screws against the aluminum body bore within seconds. Always prime the pump casing with system oil before startup.

How is the integrated relief valve adjusted?

The built-in safety valve is accessed via the end-cap regulating screw under the protective sealing cap. Turning the screw clockwise increases spring pre-load and raises the cracking pressure; turning counterclockwise reduces bypass pressure. Always calibrate using an in-line calibrated pressure gauge on the discharge line, never exceeding the 10-bar rated continuous maximum for the PDA series casing.

Can this pump handle low-viscosity fluids like Marine Gas Oil (MGO)?

The standard SEIM PDA032 is optimized for fluids between 20 and 400 cSt. Operating with low-viscosity distillates (such as MGO or diesel fuel below 5 cSt) significantly increases internal slip across the screw clearances, dramatically dropping volumetric efficiency and reducing the boundary lubrication required by the idler rotors. For distillate fuel oil handling, request SEIM models configured with treated casings and specialized mechanical seals.

What are the main signs of wear in a triple screw pump?

The first indicator of internal spindle wear or bore wash is a gradual reduction in delivery flow rate under constant system operating pressure and temperature. If flow drops while motor current remains standard or decreases, internal volumetric slip has increased. Elevated high-frequency noise or excessive bearing/housing temperature indicates suction starvation, aeration, or coupling misalignment.