Cast Iron Horizontal Multistage Boiler Feed Pump

Cast Iron Horizontal Multistage Boiler Feed Pump

Model CG-D pump is a horizontal multi-stage centrifugal pump and suitable for transporting pure water (with the contained foreign matters' content less than 1% and

graininess less than 0.1mm) and other liquids of both physical and chemical natures similar to those of pure water.

CG-D model middle and low pressure boiler water supply pump is applicable to transport medium with temperature of not higher than 105, and is also applicable for

small boiler water supply or transporting medium similar to hot water. 

Performance range of CGD series horizontal multistage boiler feed pump

Flow: 3.75~185m/h

Corollary power: 4.0~400kW

Head: 69~684m

Inlet diameter: 40~150mm

CG-D model hypo-high-pressure boiler water supply pump is applicable to transport medium with temperature of not higher than 160, and is also applicable for small

boiler water supply or transporting medium similar to hot water. 

Performance range of CGD series horizontal multistage boiler feed pump

Flow: 15~300m/h

Corollary power: 75~1250kW

Head: 390~1050m

Inlet diameter: 65~200mm

For this series horizontal multi-stage centrifugal pump,both ends of it are supported,the casing portion is in a sectional form,it is connected to and actuated by a motor via

are silent clutch and the rotating direction of it,viewing from the actuating end, is clockwise.Refer to Fig.1 for the structure of it.

Stator Portion

Consists of a suck-in section, middle section, spitting section, guide vane, and packing, all linked together with a take-up bolt. Both the suck-in and spitting mouths are vertically upward.

Rotor Portion

Includes a shaft, impeller, balancing disk, muff, and other parts.

Bearing Portion

The entire rotor is supported by roller bearings or sliding bearings at both ends of the shaft, lubricated with grease or 20 engine oil.

Cooling and Seal of the Pump

The joints between the suction section, intermediate section, and discharge section are coated with molybdenum disulfide lubricating grease as a seal. The rotor and fixed parts are sealed by a seal ring, guide-vane jacket, and packing. The packing tension of the shaft seal should be appropriate, allowing for feasible dip-by-dip seepage. Unloaded runs should be avoided.

The seal ring and guide vane jacket should be replaced if worn out to prevent damage to the pump. A spare shaft sleeve near the shaft seal protects the pump shaft. The shaft seal should hold and seal water effectively. When the transferred liquid's temperature exceeds 80℃, cooled water should be filled into the water cooling packing gland and shaft seal cooling chamber. 

Cooled water and seal water should be clean and at normal temperature. The pressure of cooled water should be 1.5-3 kg/cm², and the pressure of seal water should be more than 0.5-1 kg/cm² of the seal chamber. The cooling water pipe joints' positions vary with different pumps. Refer to the construction drawing of the pump for axial positions and chart 1 for radial positions. Shaft seals are classified as packing seals and mechanical seals. The packing seal water is industrial water with a pressure of 2-3 kg/cm². The mechanical seal's flushing water is softened water, with a pressure 3 kg/cm² higher than the inlet pressure.