Series G Lobe Pumps

SSP brand Series G rotary lobe pumps, from Alfa Laval Pumps Limited, are designed for high volume fluid transfer duties and are among the world’s largest pumps of this type. They are engineered to order, customized to suit application requirements throughout Chemical, Pharmaceutical and Waste Water Treatment processes.

From initial inquiry, the specification of the pump will be engineered to ensure the most appropriate pump is provided to meet application requirements. Series G pumps, manufactured from ductile iron, operate within general industrial and waste water treatment processes providing a good tolerance of suspended solids including fibrous matter. Series G pumps have proven ability in handling a full range of sludge thickness with rag and grit included.

Operation

The positive displacement of the Series G pump is provided by noncontacting, contra rotating tri-lobe rotors within a fully swept pump chamber. All Series G pumps are capable of bi-rotational flow without modification.

User Benefits

• High efficiency
• Low energy consumption
• Smooth flow
• Robust construction
• Reversible operation
• Ability to pump abrasive media
• Ability to pump large solids
• Cost effective and easy maintenance

The Series G pump allows for a choice of 5 models to choose from, which provides for greater application flexibility and cost effective, easy maintenance.

Pumphead

All metallic pumped media wetted components are manufactured in ductile iron. The Series G in standard specification has tri-lobe rotors manufactured from ductile iron (for non- sludge applications) or a metal insert covered with either NBR (which can be fitted with metal back plates for high fiber duties) or urethane, both giving long term wear resistance.

Shafts

Series G pump shafts are manufactured from medium carbon steel.

Gearbox

Series G pumps have a robust cast iron gearbox, which provides maximum shaft rigidity. Heavy duty taper roller bearing arrangements provide maximum support for both drive and auxiliary shafts.

Series G pump ranges have five pump head displacements ranging from 145 gallons/100 revs to 600 gallons/100 revs.

• Flow rates up to 3000 gpm
• Differential pressures up to 145 psi
• Port sizes from 6” to 12” diameter

High Volumetric Efficiency

Series G pumps offer high efficiency transfer of low, medium and high viscosity pumped media. This important aspect of performance is achieved by maintaining high accuracy and repeatability of component part manufacture, thereby maximizing shaft rigidity and minimizing the effects of thermal expansion within the pump gearbox. This combination allows the optimum pump head geometry to be achieved which, in turn, maximizes volumetric efficiency.

Listed below are optional component configurations that can be used to enhance the operation of the Series G pump.

Wear Plates

Series G pump casings may be supplied fitted with hardened, replaceable wear plates (standard on sludge pumps). The wear plates can be replaced with minimal pump dismantling and without removal of pump from service.

Pumped Media Seals

The optimum primary seal can be chosen to match the pumped media and duty conditions. Single or double mechanical seals include flushed or aseptic variants. For arduous duties hard faced seal materials such as tungsten carbide or silicon carbide can be used.

A wide variety of commercially available mechanical seal options including single and double cartridge seals are available for sludge and other difficult applications. Packed glands offer a simple, low cost, and easy to maintain controlled leakage sealing arrangement. Pumped media wetted elastomers are EPDM, NBR, FPM all FDA conforming or PTFE for chemical applications.

Connections

Pump casings are supplied with integral cast flanged inlet and outlet connections to all major standards including ASA/ANSI150, BS4504/DIN2533, BS10E and more.

Rotor Materials

For increased abrasion resistance pumps may be supplied with NBR covered (models G7-0550-H07 and G8-0745-H10 only) or urethane rotors. The urethane rotors can be supplied slotted, providing grit channels to improve rotor life.

Surface Finish & Coatings

For abrasive applications the pumphead and rotors may be supplied with a tungsten carbide coating or other surface hardening treatment to increase wear resistance.

Increased Pressure Rating

Alternative higher strength shaft materials will enhance pressure ratings.

• 145 psi for pump model G7-0550-H07
• 100 psi for pump model G8-1149-H03

Motorized Pump Units

Series G pumps may be supplied fully motorized with fixed or variable speed drives including appropriate control systems if required, mounted on either mild steel or stainless steel baseplates. In addition to electric motor drives, hydraulic, pneumatic, diesel or gasoline powered prime movers can be fitted.