BNM - Maintain-In-Place pump

Rotor and Drive Joint Access for large pumps

The BNM pump is a large standard pump equipped with smart maintenance solutions. A system known as Rotor Joint Access facilitates quick maintenance of the rotor, stator and mechanical seal via a sliding housing section. Drive Joint Access additionally allows the entire drive and coupling rod unit to easily be removed from the rear of the suction casing, thus permitting effortless maintenance of the drive-side joints.

Conveying Capacity
3–300 m³/h
13–1,320 US gpm
Pressure
48 bar
700 psi

Features and Benefits

Easy maintenance

Maintain-in-Place without removal of piping or dismantling the entire pump

Cost-effective

Significant reduction in maintenance costs. No need for disassembling joints with laborious assembly and dismantling of retaining straps. Simple removal of clogged fibrous material

Preventive

No unscheduled downtime thanks to simplified preventive inspection and maintenance of the joints

High system availability

Fast maintenance of rotor- and drive-side components for trouble-free operation

Technologies, accessories and options

Dry running protection / TSE

TSE monitors the temperature of the rotating stator and shuts down the pump when the limit value is reached to protect the pump from dry running.

Seal barrier system

This unit protects the shaft sealing by selectively supplying barrier liquid. Also available with flow meter on request.

Overpressure Protection

The pressure gauge switches off the pump as soon as a pre-set pressure is exceeded or not reached and protects the pump from increased wear and tear or piping damage.

Standard gland packing

Universal seal for hopper and standard pumps for sealing the plug-in shaft and suction casing or feed hopper. Also available with grease or lantern ring to shut off the media flow. Can also be supplied with upstream labyrinth seal and additional flush connection or lubricating device.

Single-acting mechanical seal

Universal standard mechanical seal for dosing, food applications and semi-submersible pumps for sealing the plug-in shaft in the suction casing or the hopper.

Multiple-acting mechanical seal

Mechanical seals arranged in a row. Available in "back-to-back", "face-to-face" or "tandem" sequence.

Cartridge mechanical seal

Ready-to-install pre-assembled units with supply connections and attachment brackets for quick replacement.

Base plate API 676

Particularly robust design with integrated drip tray; base plate for applications in the oil and gas industry.

Pressure Branch

With gauge connection. Flange connections alternatively to DIN or ANSI.

Rotor

Wear resistant and corrosion-proof materials, with additional surface treatment. Rotor and Stator can be removed as cartridge.

Conventional geometry

With short pitches and a compact design, the conventional geometry produces high pressures.

6L geometry

With a small rotor diameter and a long pitch, the 6L geometry attains lower surface velocities and extends the service life due to its large sealing line.

Tricam geometry

The rotor with Tricam geometry features a three-helix geometry. This enables it to achieve larger conveying capacities with the same overall length of the pump.

Stator

The seal on both ends is moulded as an integral part of the elastomeric stator; corrosion of the stator tube is never a problem because the pumped liquid never comes into contact with the metal tube or the bonding adhesive. Available with optional adjustable stator retensioning device.

6L geometry

With a small rotor diameter and a long pitch, the 6L geometry attains lower surface velocities and extends the service life due to its large sealing line.

Tricam geometry

The rotor with Tricam geometry features a three-helix geometry. This enables it to achieve larger conveying capacities with the same overall length of the pump.

Conventional geometry

With short pitches and a compact design, the conventional geometry produces high pressures.

Separate rotor connection

Allows to separate rotor without dismantling joints. Axial space for dismantling rotor/stator without removing pipes.

Rollers

Simplifies the handling of the casing element.

Rotor Joint Access (RJA)

Sliding separate casing with enlarged cross section ensures quick and easy maintenance.

Suction casing support

Holds suction casing in position when lantern is removed.

Drive unit

Can be removed from the rear of the suction casing to maintain the drive sided wear parts.

Drive Joint Access (DJA)

Quick and easy access to the drive sided joint.

Drive

Geared motors, variable speed drives or frequency controlled motors of all major manufacturers, directly flanged to the pump without additional couplings or guards. Covers made of stainless steel are available.