Centrifugal High Pressure Multistage Hot Water Pump

== OVERVIEW ===

The QDG Stainless Steel Housing Material and Free Standing Installation heat pump swimming pool heater is a horizontal multistage centrifugal boiler feed pump suitable for transporting liquids with less than 1% foreign matter and graininess less than 0.1mm. It is ideal for low and medium pressure boiler fuel pumps, as well as high-pressure boiler water supply systems. This pump is designed to handle temperatures up to 160°C and is commonly used in small boiler systems.

 

=== APPLICATION ===

 

This high-pressure stainless steel housing material and free-standing installation heat pump swimming pool heater is ideal for feeding high-pressure boilers or pumping high-pressure fuel. It can handle media with temperatures not exceeding 170°C. Common applications include municipal engineering, wastewater treatment, construction, agricultural irrigation, high-rise buildings, factories, and cooling systems in hotels and domestic water supply systems.

=== PARAMETER === 

 

Capacity range: 120-1100m³/h

Head range: 967-2500m

 

=== CONSTRUCTION FEATURE ===

The stainless steel housing material and free-standing installation heat pump swimming pool heater is supported at both ends and has a sectional casing. It is connected to the motor via a flexible coupling. The rotating direction is viewed from the motor end.

1. These boiler feedwater pumps are sectional casing, multistage centrifugal pumps. The suction casing, stage casing, and discharge casings are rigidly held together by tie bolts. The joints between these casings are primarily sealed using metal-metal contact, with O-rings as auxiliary seals.

2. The shafts of these pumps are sealed using soft-packing and cooling water. Mechanical seals can be used upon client request.

3. The rotating assembly is supported by sliding bearings on both ends of the pump shaft. Bearings are forced-lubricated, and an oil system is provided for type QD(G) pumps. The axial thrust of the rotor is balanced by a balance disc, with a thrust bearing also included to bear residual axial force caused by changes in working conditions.

The quality of the assembly of the boiler feedwater pump significantly affects its performance and operational stability. Strict adherence to technical requirements during assembly is essential, such as aligning the impeller outlet with the guide vane inlet, ensuring uniform sealing intervals, and adjusting the cover angle and central line position.

Adjustments should be made at least three times during the installation process:

First, secure the pump and foundation but not the motor.

Second, secure both the pump and motor, but do not tighten the bolts on the suction and discharge pipeline flanges.

Third, after 24 hours of operation, secure both the pump and motor.

 

=== OPERATING TIPS ===

The boiler feedwater pump must operate within its specified parameter range. It should not run with the discharge valve closed or partially closed, as this can cause overheating and reduce lifespan. Each pump must be operated under specific parameters to ensure optimal flow when installed in a parallel system.

The pump should not run with the suction valve closed, as this may cause dry running and damage parts. The medium transported by the pump should not contain air or gas, as this may affect accurate measurement of flow and head and potentially cause grinding that damages components.

The pump should not transport any material with grains, as this may reduce efficiency and shorten the lifespan of the pump. To maintain high efficiency and stable operation, regular maintenance is required, and the repair items and intervals depend on the operating conditions and performance of the pump.

 

=== DRIVER ===

The boiler feedwater pump is driven by the motor through a coupling. Gear, membrane, and hydraulic couplings can be used based on client requirements. The pump can be driven by a turbine or motor. The rotation direction of the pump is clockwise when viewed from the driving end.

 

=== CONSTRUCTION DRAWING ===

 

=== CURVE CHART ===

=== PERFORMANCE LIST ===