Boiler feeding water pump horizontal multistage centrifugal type

DG boiler feed water pump, also known as the feeding pump is a horizontal
centrifugal pump used to supply water to steam generators such as boilers.
Currently, all boiler feeding pumps are centrifugal pumps, used in fuel and nuclear
power plants.
DG series is a common horizontal multistage centrifugal pump with a flow rate
typically ranging from 10 to 500 m³/h and a head coverage of 100 to 2000 meters,
operating at temperatures ≤160°C. This pump model features cast steel or
stainless- steel flow components and possesses characteristics such as high
efficiency and low net positive suction head. Boiler feed pumps must comply with
standards like GB/T 5657 and API 610, along with specialized technical
specifications such as JB/T 6614-2025.
Performance range (design point)
Flow rate Q: 3.75~720 m³/h Head H: 476~985 m
Structural characteristics:
DG type pump is a horizontal, single-suction, multi-stage segmented centrifugal
pump. Both the inlet and outlet of the pump are vertically upward. The tightening
bolts connect the suction section, middle section, and discharge section into a
single unit.
The pump rotor consists of components such as the impeller and balance disk mounted
on the shaft. The entire rotor is supported by sliding bearings at both ends of the
pump shaft. The bearings are lubricated with oil and cooled by circulating cold
water. The axial force of the rotor is balanced by the balance disk.
The shaft seal adopts either packing or mechanical sealing. Sealing glands are
installed at both ends of the shaft, containing soft packing or mechanical seals.
Pressurized water is directed into the sealing glands to provide water sealing and
cooling functions. A replaceable bushing is fitted at the shaft seal to protect the
pump shaft. The pump is directly driven by the motor through an elastic coupling,
and from the motor end, the pump rotates clockwise.
The boiler feeding water pump is a horizontal, two-end supported, radially split,
radial-flow centrifugal pump used to provide feedwater equivalent to steam
discharge for steam generators (such as boilers or nuclear reactors).
During the operation of the boiler feedwater pump, it is necessary to ensure a
minimum flow rate to prevent damage to the pump caused by vaporization or
cavitation due to the increase in medium temperature under low flow conditions.
This is usually achieved by installing a minimum flow valve (automatic
recirculation valve).
The pump can only operate within the specified parameters; It is not allowed to
operate for a long time when the outlet valve is closed or the opening is very
small; Cannot close the suction valve for operation; The conveying medium must not
contain air or gas; Materials that cannot transport particles on the conveyor belt;
Before starting, a check is required.
Before starting the pump, check the bolts, pipelines, instruments, valves, oil
level, and motor direction; Open the suction valve and close the outlet valve when
starting, fill the pump with liquid, start the motor, and slowly open the outlet
valve after normal operation.
During the operation of the pump, it is necessary to regularly monitor the
pressure, flow rate, temperature, vibration, and lubrication conditions. The
temperature rise of the bearing should not exceed 35 ℃ above the ambient
temperature, and the maximum temperature should not exceed 75 ℃. It is necessary
to check whether there is balancing liquid flowing out of the balancing device
(connected to the suction section through the balancing water pipe).
When stopping the pump, the outlet valve should be closed to the minimum flow rate
first, then the motor should be stopped, and finally the outlet valve should be
closed. After the pump stops steadily, the suction valve should be closed. It is
strictly prohibited to close the suction valve first.

Minimum Order: 1 sets

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