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Ahead pump

key word:Heat exchange element


Product description

Ahead pump (rolling bearing)

 

1.General 
The pump is a horizontal, single-stage axially separated type with a casing supported near the centerline to allow free expansion in the axial and radial directions, thereby maintaining alignment. The pump is mounted integrally on a rigidly constructed pump base equipped with a suitable drainage device.

 

2.Casing
The casing is a high quality carbon steel casting, is a double worm shell type, horizontal centerline separation, inlet and outlet pipes in the lower half of the casing structure, so as to avoid disassembling the coupling pipes during maintenance.
The horizontal centerline of the shell is equipped with a compressed asbestos paper cypress pad.
In order to reduce the deformation of the flange under the combined effect of pressure load and thermal shock, high-strength bolts are used, and cylindrical cap nuts are used to facilitate the use of minimum pitch.
The casing is supported on a box-type structural steel welded pump base through a pump foot cast together with it, and the joint surface of the casing and the pump base is close to the centerline of the shaft, while the key configuration maintains longitudinal and transverse alignment and is suitable for thermal expansion.
An exhaust valve is provided on the top cover of the casing.

 

3.Impeller
The impeller is a double suction type, cast in stainless steel, machined to exact fit tolerances and statically balanced. The double suction construction ensures that the axial force on the impeller is basically balanced, and a bearing capable of withstanding two-way thrust is provided on the free end to balance the remaining axial force.
The impeller is fixed to the shaft by a key, and the axial position is determined by the nut of the wheel shaft at both ends, this arrangement allows the impeller to be positioned on the centerline of the worm gear.

 

4.Shaft
Stainless steel forgings, in stress relieved condition, are rough machined before quenching and tempering. After heat treatment, cutting is carried out until a radial margin of 3mm is left, then the shaft is placed in a vertical furnace for stress relieving, followed by final machining and grinding.
Impeller sealing ring
This ring reduces leakage and is installed in the casing cavity and positioned by the anti-rotation locating pin.

 

5.Bearing
The front pump is equipped with a single row of radial short cylindrical roller bearings at the drive end and two single row tapered roller bearings mounted face to face at the free end.
The bearings are mounted on bearing brackets firmly attached to the support flange at the end of the pump casing, and the entire assembly is positioned with the pump casing by pins to ensure accurate reassembly.
The front pump is lubricated with thin oil, and the bearing bracket is equipped with a cooling water chamber to cool the bearings and is equipped with temperature measurement points.

 

6.Shaft seal
The pump is equipped with a mechanical seal, which is balanced and consists of a spring-loaded dynamic ring and a water-cooled static ring. The separate stuffing box is equipped with a water-cooling sleeve so that the temperature around the rotating part of the mechanical seal is low.

 

7.Coupling
The laminated coupling between the pump and the motor is a flexible and torsionally rigid metal laminated structure.

 

8.Pump Seats
The pump base is a heavy-duty, solid box-section steel section. When used as a pre-pump for a vapor pump set, the pre-pump and its drive motor are equipped with a common base.

9. Pump parameters of FA1D53

 

Model FA1D53
Type Horizontal, axial medium split pump casing type
Pumping medium Boiler feed water
Number of stages 1-stage double suction impeller
  Unit Rated working condition Maximum working condition
Flow rate m3/h 552.4 600.23
Head m 90.86 89.4
Cavitation allowance (required) m 3.55 3.76
Efficiency % 80.44 81.8
Shaft power kW 151.53 158.7
Inlet water temperature 175 179
  Unit Rated working condition Maximum working condition
Intake water density kg/m3 892 888
Rotational speed r/min 1480
Inlet pipe specification mm φ325×8
Outlet pipe specification mm φ273×7
Rotation direction   Clockwise (looking from drive end to free end)
Weight Kg 2305

 

10. Pump drawing

 

11. Pump models and parameters

11.1. QG500-80 is used for 125 MW unit of 100% capacity and 300 MW unit of 30% capacity, with feed pumps FK5G32 and FK6G32A and couplings CO46 and YOT46-508. Its flow rate is 505m3/h, head is 76m, efficiency is 79%, speed is 2985rpm and cavitation allowance is 4.7m.
11.2. QG465-65 is used for 200MW 50% capacity, the feed pump is FK5G32A, the coupling is CO46, YOT46-508, etc. Its flow rate is 478m
3/h, head is 64m, efficiency is 79%, speed is 2985rpm, cavitation allowance is 5m.
11.3. FA1B56, FA1B56A for 200MW 100% capacity, its flow rate is 780m
3/h, head is 92m, efficiency is 82%, speed is 1490rpm, cavitation allowance is 3.6m.
11.4. FA1D56 and FA1D56A feed pumps are DG600-240 with a flow rate of 650m
3/h, a head of 100m, an efficiency of 82%, a speed of 1490rpm and a cavitation allowance of 3.8m.
11.5. FA1D53 and FA1D53A are used for 300MW 50% capacity with a flow rate of 650m
3/h, head of 80m, efficiency of 82%, speed of 1490rpm and cavitation allowance of 3.8m.
11.6. FA1D67 and FA1D67A are used for 600MW 50% capacity, with a flow rate of 1200m
3/h, head of 147m, efficiency of 82%, speed of 1490rpm and cavitation allowance of 5m.
11.7. FA1D63 for 600MW 50% capacity, with a flow rate of 715m
3/h, head of 125m, efficiency of 82%, speed of 1490rpm and cavitation allowance of 4.1m.
11.8. HZB253-640 for 600MW 30% capacity, with a flow rate of 1200m
3/h, head of 140m, efficiency of 83%, speed of 1490rpm and cavitation allowance of 6m.