High Pressure Multistage Ring Section Pump - MD/ME/MDV

Description

The MD/ME/MDV series from Stream Pumps is a single-casing, radially split, multistage, between-bearings pump (API 610 type BB4). Also known as ring-section pumps or segmental-ring/tie-rod pumps, these systems are designed for high-efficiency performance in demanding applications.

Operating Data (50Hz)

• Suction nozzle: DN50 to DN200
• Discharge nozzle: DN32 to DN150
• Capacity range: 4 to 460 m³/h
• Heads range: 20 to 900 m
• Working Temp. range: -20℃ to 90℃
• Operating pressure: Up to 100 bar (extendable to 150°C as an option)

Fields of Application

• Sea Water Reverse Osmosis (SWRO) applications
• Zero discharge of concentrated salt
• Boiler feed water
• Clean water pumping stations
• Any other high-pressure applications with clean liquids

Direction of Rotation

The pump rotor rotates clockwise when viewed from the motor to the pump.

Features and Benefits

Suction and Discharge Casings

• Flange raised face per ANSI/ISO or EN/DIN standards.
• Product-lubricated silicon carbide sleeve bearing for end-suction pumps.
• Casing wear rings as standard to enhance durability.
• Segmental radial section structure for larger inlet/outlet, optimized flow, and reduced noise.
• Radial fully symmetrical hydraulic design minimizes radial force, improving efficiency and extending rotor life.

Suction and Discharge Flanges

• MD pumps offer side or top suction/discharge configurations.
• MDV designs allow for 90° relative positioning of suction and discharge ports.
• ME series features end suction, with discharge options for side or top mounting.
• Radial suction and discharge flanges ensure easy maintenance of mechanical seals and bearings.

Impeller

• Enclosed type with precision investment casting.
• Dynamically balanced and keyed to the shaft.
• Superior hydraulic efficiency ensures high energy savings.

Shaft

• Staggered keyways enhance balance.
• Robust design ensures minimal deflection even under maximum load, prolonging mechanical seal and bearing life.

Balancing Device

• Involute balance drum for axial thrust balance.
• Dual-step surface ensures closer running clearance and efficient performance.

Bearings

• End suction sleeve bearing supported in the suction casing.
• Heavy-duty anti-friction bearings housed in larger chambers.
• Available with oil or grease lubrication.

Mechanical Seal

• Single or double cartridge seals available.
• Supports standard seal flush plans with options for modified plans like 11/13.

Installation Options

• MD: Side suction horizontal installation.
• ME: End suction horizontal installation.
• MDV: Side suction vertical installation.

Modular parts reduce inventory, with universalized designs for easier servicing.

Drivers

• Electric motors
• Steam turbines
• Diesel engines
• Speed-increasing or reducing gears available for enhanced compatibility.

Baseplates and Coupling

• Rigid steel baseplates reduce vibrations and assure positive alignment.
• Flexible couplings are available with or w

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