High-Efficiency Vessel Gear Pump

PSI-Polymer Systems is showing its first-ever Vessel Gear Pump (VGP). This product is used beneath polymer reactor/devolatilization vessels or after large twin-screw compounding extruders for discharging a steady volumetric output to the pelletizer. The VGP series accommodates pilot operations to full production. Current models are available for rates to 20,000 lb/hr. VGP series pumps are also ideal for other vessel applications such as hot-melt adhesive production.

These high-efficiency pumps generate high-discharge pressures while accommodating very low-pressure in-feed of high and low viscosity materials. Typical inlet pressures are under vacuum or to 145 psi. A choice of feed openings optimizes flow even under conditions of very low vessel-fill levels and high vacuum. For higher viscosities, to avoid cavitation and assure positive fill of the gear teeth, PSI offers 170° of gear opening.

The new VGP features a small footprint and all stainless-steel construction. Housings (forged or cast) contain internal flow passages for uniform heating generated from steam or oil systems. All pumps are configured for hazardous area operation. Models accommodate discharge pressures to 4350 psi and a temperature range to 500 F, with an option for 660 F.

Shaft sealing is accomplished using single or double mechanical seals or standard visco seals. Seal design accommodates fast, easy replacement, with off-the-shelf seal availability from PSI. This is an important feature as a common problem with these types of products is seal replacement availability.