LY Series VERTICAL SINGLE-CASING SUMP PUMP

Overview

LY series are single stage single suction radial split case long shaft submerged pumps designed and fabricated as per API 610 11th Edition VS4. Pump shaft shall be supported by rolling bearings inside the bearing housing as well as sleeve bearings inside the column pipes. The pump shall be installed under water as deep as 6m. Selection chart is able to cover the range of the flow rate up to 800m3/h and head up to 200m. It is applicable for pumping clean or polluted media.

Structural support parts, bearing assembly and pump shaft follow the principle of standard design so as to facilitate better spare parts interchangeability and easy for manufacturing and maintenance. Rigid shaft is designed to guarantee stable operation of pump. The pump operating speed is designed well lower than the 1st critical speed of the rotor so as to guarantee the stable operation under severe conditions. Pump is of radial split casing structure; pumps with nominal flange nozzle lager than 80mm are designed as double volute structure to balance radial force and vibration caused by hydraulic actions.

Performance Range

Flow rate: Q = 2 ~ 800 m3/h

Disch. Head: H = 5 ~ 200 m

Working pressure: up to 2.5 Mpa

Working temperature: t= -20 ℃ ~ +120℃

Model Description

Pump Structure

1. Connecting structure

Connecting structure is of safety and reliability to guarantee operation of pump.

2. Pump casing

It is of double volute structure (for pump nozzle larger than 80mm) to balance most of the radial force with less shaft deflection and vibration.

3. Support

Rotor is designed with multi-points supporting and the guide bearing intervals conforming to API 610 standard to ensure that max. allowable continuous speed is lower than the 1st critical speed. Rolling bearing is lubricated by grease or oil to guarantee the service life as per API610 recommendation. Submersible sleeve bearings are equipped with external flushing or self-flushing.

4. Shaft seal

Due to independent discharge pipe and non-pressurized medium leakage at shaft stretching direction, shaft seal is not needed for pumping non-volatile liquid. However, other forms of cartridge mechanical seals can be installed as per API682 in case of need. Mechanical seal chamber design conforms to API610.

5. Pump shaft

High strength rigid shaft design shall guarantee the stable operation of pump.

6.Heat trace and insulation structure

Steam heat trace jacket is designed and fabricated around the pump casing, connection column and discharge pipes so that high temperature liquid sulphur can be transferred.

Cross Section Drawings

LY Series Family Curves