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SEZ / PHZ / PNZ series circulating water pump

key word:Heat exchange element

Category:


Product description

SEZ / PHZ / PNZ series circulating water pump

 

1. Introduction

1.1. Application

The series of circulating water pumps are used to transport circulating cooling water in rated load power plants and peak load power plants. Parallel connection or circulating water collecting system can be used for water supply. The configuration of pump is usually 1 × 100% ~ 6 × 16%, which is matched with 300 MW and 600 MW units in domestic power plants, and gradually applied to 1000 MW units.

1.2. Model meaning

**##V@@-%%/$$×※※VR

**----- circulating water pump model (SEZ or PHZ or PNZ)

##----Structural form (without this item means core pulling; n means no core pulling; t represents barrel type

V ------- when there is this item, the blade can be adjusted

@@----------Nominal size of pump outlet diameter (mm)

%%--------------Impeller outlet diameter nominal size (mm)

$$-----------Nominal size of impeller inlet diameter (mm)

※※-------The number of impeller stages (no such item for single stage impeller)

VR--------If there is this item, it means that there is front guide vane

1.3. Structural features

1.3.1. Structural form: it can be divided into core pulling type and non pulling core type structure. According to the current maintenance requirements of power plant, the core pulling structure is mostly adopted.

1.3.2. Structure description:

1.3.2.1. Core pulling pump. The core pulling pump consists of two main parts, namely the shell and the extractable part. The shell part of the pump is mainly composed of inlet horn, connecting pipe, outlet elbow, bottom plate, etc.; the extractable part is mainly composed of outer ring of moving blade, guide vane body, inner connecting pipe, bearing bracket, pump shaft, coupling, impeller, pump cover, etc., in which pump shaft, coupling and impeller constitute rotor parts. The structure of core pulling circulating water pump is shown in Fig. 16-1.

1.3.2.2. Non core pump. The non core pulling pump consists of two main parts, namely, the shell and the rotor part of the pump. The shell part of the pump is mainly composed of inlet horn, nozzle, outlet elbow, bottom plate, outer ring of moving blade, guide vane body, inner pipe, bearing support, etc.; the rotor part is mainly composed of pump shaft, coupling and impeller. The structure of non core pulling circulating water pump is shown in Fig. 16-2.

1.3.3. Description of safety parts:

1.3.3.1. Base rail of pump foundation. The pump is placed on the foundation seat rail embedded in concrete, and the foundation seat rail is equipped with adjusting bolt and anchor bolt: the adjusting bolt is used to adjust the seat rail level during concrete pouring; the anchor bolt is used to fix the seat rail in the foundation.

1.3.3.2. Inlet channel. The inlet passage has the following forms:

① Conventional open inlet channel: conventional open inlet chamber is selected, which has no special civil dimension.

② Open inlet channel with lining: in order to optimize the inlet conditions, a specially designed open inlet channel is specified. The length and width of the inlet channel and the geometry of the back wall are defined. These dimensions reduce the minimum suction head of the conveying medium and the submergence depth of the pump, and ensure the safe operation without air vortex belt and vaporization.

③ Closed inlet channel with lining: in order to ensure good inlet flow state, special civil dimensions of closed inlet chamber are specified.

④ Elbow type inlet passage: in order to ensure that the inlet water flows to the pump evenly and speedily, the inlet elbow is arranged at the bottom of the pump. The inlet elbow begins with a square section, which decreases uniformly along the flow direction until it transits to a tubular section.

1.3.3.3. Inlet cone. In order to ensure the stable operation of the pump, the water inlet flow pattern of the pump is required to be uniform. Therefore, a water inlet cone is arranged under the water inlet horn of the pump. The water inlet cone made of metal can ensure a good geometric size.

1.3.3.4. Impeller. The impeller can be divided into semi open mixed flow impeller, open adjustable mixed flow impeller and open adjustable axial flow impeller. The open mixed flow impeller has twisted blades. The outlet diameter (cutting diameter) of the blade is cut to meet the required lift precisely. The clearance between the impeller and the impeller chamber is adjusted by lifting the rotor components. For adjustable axial or mixed flow blades, the impeller blades are mounted radially / semi axially on the impeller hub. The blade angle can be changed as required, that is, the impeller hub is removed and the blade is readjusted to the required angle.

1.3.3.5. Pump shaft. The distance between radial bearings of pump shaft is determined according to motor power and pump speed, as well as safety margin relative to critical speed. According to the length of the pump and the selected shaft diameter, the multi-stage pump shaft is selected. The pump shafts are connected by rigid coupling.

1.3.3.6. Bearing structure / lubrication. The radial support of the shaft can select KSB residur wear-resistant ceramic bearing. At this time, the pump is self-lubricating with medium, and also can choose the siron or rubber bearing. The pump shaft is protected by a sleeve, and the bearing is lubricated by external clean pressure water. If the liquid to be transported is clear water, self-lubricating form can also be used for the siron or rubber bearing, and the shaft protection sleeve is not necessary.

1.3.3.7. Thrust bearing. Bearing axial force thrust bearing, can be selected in the pump or motor. Generally, oil lubricated thrust pad guide bearing or tapered roller bearing with oil bath lubrication (under special circumstances) is used as support bearing.

1.3.3.8. Shaft seal. The shaft seal is designed as asbestos free soft packing. The shaft is equipped with replaceable shaft sleeve within the scope of sealing set. Mechanical seal is available as a special structure.

1.3.3.9. Coupling. A disc type coupling is used to connect the shaft. The pump and motor are connected by elastic coupling (thrust bearing in pump) or adjustable rigid coupling (thrust bearing in motor).

1.3.3.10. Outlet position. The outlet is horizontally arranged in the upper or lower part of the pump foundation.

1.3.3.11. Flange. Flange can be selected according to GB standard, ISO standard, DIN standard or ANSI standard

1.3.3.12. Motor. In general, the pump is directly connected with the motor. Gearbox can be used at low speed.

1.3.4. Description of important characteristics:

1.3.4.1. On the premise of ensuring the high performance of the pump, the selected core pulling component has enough rigidity, and its two-point support in the cylinder body is a typical static structure design. There is no supporting rib plate between the core pulling part and the connecting pipe, which will not interfere with each other and cause transverse vibration. The installation, disassembly and maintenance of the pump are also very convenient.

1.3.4.2. Unique inlet channel design. The central guide cone of cast-welded structure in the inlet channel is an integral part of the pump design. The similarity law of simulation test is strictly followed to avoid the change of pump suction performance caused by non-uniform flow pattern and additional vortex generated in the physical flow channel not according to the similarity law, so as to ensure the pump has good inlet stability and cavitation resistance, The submergence depth required by the pump is reduced.

1.3.4.3. The water lubricated bearing of special rubber has a long service life; there is also a RESIDUR ceramic bearing (imported) for users to choose. This kind of bearing does not need external cooling and lubricating water system, and can operate safely in medium containing sediment for a long time. The service life of bearing is more than or equal to 80000 h, and the operation is reliable and the maintenance cost is reduced.

1.3.4.4. The cylinder and guide vane body adopt welding structure, which can greatly reduce the quality of the pump; before welding, the guide vane of the guide vane body is formed by integral die pressing of steel plate, and necessary shape setting treatment and surface polishing are carried out after forming, which can reduce the friction loss in the pump and avoid the vibration caused by vortex belt excitation, and ensure that the overflow part has good hydraulic performance.

1.4. Technical level and advantages

In the 1990s, German KSB transferred SEZ / PHZ / PNZ circulating water pump series technology to Shanghai KSB, which was digested and absorbed by Shanghai KSB to meet the market demand. The diameter of the pump is 600-2400mm, the flow rate is 65000 m3/h, the head of single-stage pump is 33m, and the head of two-stage pump is 65m. The structure is reliable, the installation is convenient, and the maintenance is simple. The efficiency is generally 2% - 3% higher than that of the original products of the same kind. It has excellent cavitation resistance and is the first in China. Three designs of radial sliding bearing, vertical core pulling structure and non swirl inlet channel have obtained utility model patents, with patent numbers of ZL200720075188.1, ZL200720075200.9 and ZL200720075197.0. The pump form is vertical mixed axial flow pump. The advanced structural design, pollution-free ceramic bearing with long service life and advanced inlet channel without swirl can ensure the safe and reliable operation of the pump. The high efficiency hydraulic model designed by UG 3D software can ensure the efficient operation of the pump. The core pulling structure design can greatly reduce the maintenance cycle and cost. The ceramic bearing does not need external lubricating water, which can reduce the operation cost.

 

2. Main technical parameters and product appearance

2.1. Main technical references

The SEZ / PHZ / PNZ series circulating water pump adopts modular structure design. The standard design of pump outlet diameter is DN600 ~ DN2400. The main technical parameters are shown in table 16-1, and the type spectrum is shown in Figure 16-3. In addition, it can be designed and manufactured according to the special needs of customers. See Fig. 16-4 ~ Fig. 16-6 for SEZ product model, specification and model spectrum.

Table 16-1

No. Pump model Impeller type Flowm3/h Headm
1 SEZ Semi open mixed flow impeller appa. 18 733
2 PHZ Open adjustable mixed flow impeller appa. 18 1225
3 PNZ Open adjustable axial flow impeller appa. 18 715

2.2. Product installation mode

According to the outlet position of the pump and the support mode of the pump and motor, the installation methods of the circulating water pump can be divided into 4 types, as shown in Fig. 16-7 and table 16-2.


Table 16-2 four installation methods of SEZ / PHZ / PNZ series circulating water pumps

Installation mode Supporting solution Outlet position Pump support Motor support Remarks
CD Single foundation Horizontal layout under foundation Pump foundation Pump foundation / bottom plate / motor base The outlet elbow is arranged under the foundation floor, and the pump is suspended under the foundation floor above the outlet elbow. The motor is connected with the flange of the pump bottom plate through the motor base
EB Horizontal layout above foundation Pump foundation / water elbow / motor base The outlet elbow is arranged under the foundation floor, and the pump is suspended on the foundation floor above the outlet elbow. The motor is connected with the flange of the pump outlet elbow through the motor base.
EM Pump foundation / motor base The outlet elbow is arranged under the foundation floor, and the pump is suspended on the foundation floor above the outlet elbow. The motor is installed on the motor base, and both the motor base and the pump are installed on a common foundation plate.
EJ Double foundation Horizontal arrangement between motor foundation and pump foundation Motor foundation / motor base The outlet elbow is arranged above the pump foundation floor, and the pump is supported on the foundation floor below the outlet elbow. The motor is mounted on a separate foundation slab above the pump foundation floor.

 

3. Selection method

3.1. Performance parameters

The following data related to the performance parameters of the pump set shall be included in the relevant documents of the customer:

3.1.1. Matching requirements of pump quantity and unit capacity

3.1.2. Pump outlet flow (including design flow and flow range).

3.1.3. Pump outlet head (including design head and head range).

3.1.4. Pump efficiency

3.1.5. Pump speed

3.1.6. Mulberry shaft power limit.

3.1.7. Pump NPSH.

3.1.8. Pump vibration and noise.

3.1.9. Whether the pump blade is required to be adjustable.

3.1.10. Motor voltage, matching power and efficiency, etc.

3.2. Site conditions

3.2.1. Altitude.

3.2.2. Installation position (indoor or outdoor).

3.2.3. Circulating water source.

3.2.4. The circulating water system adopts the mode of water supply system.

3.2.5. Pump inlet conditions:

3.2.5.1. Water level height (including minimum water level).

3.2.5.2. Elevation of suction bell mouth.

3.2.5.3. The minimum submergence depth of the pump is allowed (from the bell mouth).

3.2.5.4. Bottom elevation of suction well.

3.2.5.5. Spacing between pumps.

3.2.5.6. The inlet channel of water pump is wide.

3.2.5.7. The minimum length of the straight section of the water pump inlet channel.

3.2.5.8. Minimum distance between pump center and filter screen.

3.2.6. Pump and motor cooling water conditions:

3.2.6.1. Cooling water pressure.

3.2.6.2. Cooling water temperature.

3.2.6.3. Cooling water quality.

3.2.7. Pump outlet conditions:

3.2.7.1. Center line elevation of outlet pipe.

3.2.7.2. Outlet connection diameter and connection mode.

3.2.8. Conditions of transported medium:

3.2.8.1. Density.

3.2.8.2. Temperature.

3.2.8.3. The water quality analysis report should be provided.

3.2.8.4. Sand content.

3.2.9. Installation foundation and support of pump and motor:

3.2.9.1. Single foundation or double foundation.

3.2.9.2. Inlet floor elevation.

3.2.9.3. Pump foundation elevation.

3.2.9.4. Motor foundation elevation.

3.2.9.5. Support position

3.2.9.6. Installation mode (EB or EJ or em or CD)

3.2.9.7. Nozzle load of pipeline system

3.2.9.8. Natural frequency of foundation.

3.2.10. Voltage, phase and frequency of the power supply

3.2.11. Environmental conditions:

3.2.11.1. Outdoor ambient temperature limit value

3.2.11.2. Indoor ambient temperature limit value.

3.2.11.3. Annual mean atmospheric pressure

3.2.11.4. Annual average relative humidity

3.2.12. Seismic intensity (including peak ground acceleration)

3.2.13. The maximum lifting height and lifting capacity of pump unit room.

3.3. Supply requirements

3.3.1. Product life requirements.

3.3.2. Special material requirements of pump overflow parts, such as nozzle, impeller, guide vane body and flange

3.3.3. Special material requirements of pump unit support, such as base plate, base, etc

3.3.4. The scope of supply beyond the termination point specified in "5. Scope of supply and general technical specification for products", such as export counter flange and connecting accessories.

3.3.5. Special performance requirements of motor, such as variable speed or variable load.

3.3.6. Special motor auxiliary instrument.

3.3.7. Statement of self provided motor.

3.3.8. Remote control requirements.

3.3.9. Any additional measuring instruments, such as pump set vibration monitoring, reversing monitoring instrument, etc

3.3.10. Special requirements for protection (including paint), packaging and transportation.

3.3.11. Any requirements on the expression language of equipment documents.

3.3.12. Special requirements for on-site installation guidance service and training.

3.3.13. Field performance test requirements

 

4. Selection examples

Taking the 2 × 600MW unit of a power plant in the water source of the Yangtze River as an example, the selection example of circulating water pump is given,

4.1. Site operation conditions

4.1.1. System overview. The circulating water system of the project adopts direct current circulation. There are 4 circulating water pumps in the circulating water system. The circulating water pump house is located in the northeast corner of the plant area. The distance between the circulating water inlet pipe and the main power house is about 550m

4.1.2. Equipment installation location. It is installed in the circulating water pump house.

4.1.3. Installation and layout of circulating water pump house

The design maximum water level of the forebay is 5.49m;

Design minimum water level of intake forebay (designed low water level in winter): - 1.39M;

The lowest designed water level of circulating water pump is -2.86m;

The lowest design operation water level of circulating water pump (summer): - 2.60m;

Operation layer elevation of inlet chamber: 6.40m;

Elevation of water pump motor floor: 3.30M:

The elevation of the bottom plate of the water pump suction room is -9.20m;

Width of inlet channel of water pump: 6.00m;

Elevation of suction bell mouth of water pump: - 7.98m;

Center line of outlet pipe: 0.4m;

The range of outdoor temperature: - 12.0 ~ 40.9 ℃;

Inlet water temperature range: 2.2 ~ 32.2 ℃.

4.1.4. Meteorological information department. According to the data statistics of the local meteorological station of the project, the characteristic values are as follows:

Average temperature: 15.1 ℃;

Extreme maximum temperature: 38.1 ℃;

Extreme minimum temperature: - 11.3 ℃;

Average atmospheric pressure: 1016.3 hPa;

Average water vapor pressure: 16.2 hPa;

Average relative humidity: 80%;

Minimum relative humidity: 11%;

Average annual precipitation: 1035.9mm;

Annual maximum precipitation: 1748.0 mm:

Annual minimum precipitation: 640.0 mm;

Maximum daily precipitation: 184.1 mm;

Annual average wind speed: 3.5m/s;

Maximum 10 min average wind speed: 20.7m/s;

The average design wind speed of 10 min at 10 m height with 50 year return period is 26.8m/s;

Annual dominant wind direction: ESE;

Frequency of dominant wind direction: 11%;

Seismic fortification intensity of the site: grade VII

4.1.5. Water quality analysis data. See table 16-3 for water quality analysis data

Table 16-3 water quality analysis data

No. Test items Yangtze River Raw Water Yangtze River Raw Water
17-May-03 June 23 2003
1 All solidmg/L 147.7 133.7
2 Suspended mattermg/L 40 30
3 PH25℃) 7.94 8.03
4 Total alkalinitymmol/L 1.5 1.4
5 CO32- mmol/L 0 0
6 Total hardnessmmol/L 1.96 1.8
7 Permanent hardnessmmol/L 0.46 0.4
8 Humic acid saltmmol/L 0 2.44
9 Camg/L 33.5 34.64
10 Femg/L 0.28 0.25
11 Namg/L 8.63 6.48
12 Mgmg/L 5.18 5.02
13 Kamg/L 2.3 2.27
14 Sulfatemg/L 26 21
15 Chloridemg/L 8 10
16 Dissolved solidsmg/L 107.7 103.7
17 SiO2mg/L 5.68 6.12
18 ConductivityμS/cm 269 236
19 OHmmol/L 0 0
20 HCO3mmol/L 1.5 1.4
21 Temporary hardnessmmol/L 1.5 1.4
22 Negative hardnessmmol/L 0 0
23 Chemical oxygen demandmg/L 2.8 2.4

4.2. Type selection

4.2.1. Form: wet well type, fixed blade, rotor extractable type, vertical mixed flow pump.

4.2.2. Layout: vertical parallel arrangement

4.2.3. Support form: single foundation support.

4.2.4. Blade type: fixed type.

4.2.5. Equipment body: see table 16-4 for model selection

Table 16-4 selection of equipment body (two units)

No. Name Specification and model Unit Quantity
1 Pump body SEZ2200-1590/1400 Set 4
2 Lubricating water system of the water pump bearing   Unit 4
3 Cooling water system of motor bearing   Unit 4
4 Matching motor and its accessories (imported SKF Bearing is used for motor rolling bearing and domestic bearing is used for thrust bearing) YLKK2150Kw,18P,IP44,F,50HZ,6KV Unit 4
5 Exhaust valve and buffer valve CARX-01/DDCU-01 Unit 4
6 Oil level observation platform and motor ladder     4
7 Thermal monitoring instruments (including motor winding, bearing temperature, reversal monitoring, etc.), outgoing line and corresponding junction box   Unit 4

Note: 1. Water pump: including base and coupling, anchor bolt assembly, pump outlet flange, pump outlet counter flange and its connecting accessories.

2. Motor: including motor base, ventilation grille and filter, space heater, bearing, junction box, grounding device, lifting hook or lifting ring, lifting bolt, resistance temperature detector (RTD) of stator winding, bearing temperature detector and thermal resistance, bimetal thermometer for measuring thrust oil temperature (installed on the upper frame), installation and removal tools of thrust head, etc.

3. Water pump bearing lubricating water system and motor bearing cooling water: including 4 pieces of ASCO solenoid valves, 2 pieces of SOR flow switches, 4 pieces of  filters, 8 pieces of water flow observers, 12 pieces of  ball valves and corresponding pipeline systems. The accessories of the system shall meet the requirements of remote control and monitoring.

4. The inversion monitor adopts imported Philips 3000 system. The demander power supply is 220 VAC, and the fixed value of reverse signal is adjustable.

4.2.6. Summary of performance parameters (see table 16-5).

Table 16-5 summary of performance parameters

No. Parameter in detail Summer conditions Conditions in spring and Autumn Winter conditions
(one machine with two pumps in parallel) (two machines and three pumps running) (one machine and one pump running)
1 Flow of single pumpm3/s 10 11.4 12.38
2 Headm 15.5 13.4 11.3
3 Shaft powerKW 1749 1696 1464
4 Speedr/min 330 330 330
5 Net positive suction head (NPSHr) (m) 11.4 10.4 10.7
6 Pump efficiency% 86.9 88.3 86.2
7 Pump body designing pressure /test pressureMPa 0.4/0.4
8 Closing head (m) 29
9 Braking powerKW 1749 1696 1464
10 Normal bearing vibration value of motor (vibration speed, mm/s) 2.8
11 Normal vibration value of motor upper bearing (double amplitude, mm) 0.076
12 Normal vibration value of motor lower bearing (double amplitude, mm) 0.051
13 Minimum submergence depth (m) from above the suction bell mouth 3.2

 

4.2.7. Structure size / configuration (see table 16-6).

Table 16-6 structure size / configuration

No. Structure / configuration name Size / configuration
1 Pump body dimensionslength/diameter)(m/m 11.28/2.1
2 Pump shaft length/No.s of shaft sectionm/piece appa. 5.5/2
3 Impeller diameterMax./Min.)(mm/mm 1590/1200
4 Impeller stages Single stage
5 Rotor diametermm 1600
6 Bearing type/quantity Water guide bearing/2
7 Rated loading thrust/Max.thrustKN/KN 200/240
8 Transmission powerKW 2500
9 Sealing type Packing sealing
10 Gross weight of pumpempty/full water)(kg/kg 46160/49500
11 Max.lifting lengthm 5.6
12 Max. lifting weightkg 30000

 

4.2.8. Material of main parts (see table 16-7).

Table 16-7 material of main parts

No. Part No. Part Name Material No. or Code
1 138 Water inlet horn HT250
2 144 Outlet elbow Q235A welding
3 163 Pump cover (up and down) Q235A welding
4 171 Guide vane body Q235A welding
5 176 Inlet cone ZG230-450/20 welding
6 211 Pump shaft 35CrMo
7 213 Transmission shaft 35CrMo
8 230 Impeller ZG07Cr19Ni9
9 341 Motor base Q235A welding
1o 350 Bearing bracket HT250
11 441 Stuffing box HT250
12 452 Packing gland HT250
13 512 Impeller chamber ZGo7Cr19N9
14 524 Shaft sleeve 14Cr17Ni2
15 529 Shaft sleeve 14Cr17Ni2
16 545 Guid bearing HT250/thordon bearings
17 593 Base Q235A welding
18 711 Down connection pipe Q235A welding
19 711 Middle connection pipe Q235A welding
20 711 Up connection pipe Q235A welding
21 713 Protecting pipe Q235A welding
22 841 Coupling parts 45
23 844 Middle coupling parts 45
24 890 Bottom plate Q235A welding
25 901 Bolt Stainless steel
26 902 Bolt Stainless steel

 

4.2.9. Motor parameters (see table 16-8)

Table 16-8 parameters of YKKL2150-18 / 2150 - type motor

No. Motor parameter data No. Motor parameter Data
1 Rated voltage (V) 6000 10 Mounting type Vertical
2 Rated frequency (Hz) 50 11 Moment of inertia of water pump (kg/m2) 890
3 Rated power (kW) 2150 12 Rotor type Copper bar
4 Efficiency (%) 94 13 Working system S1
5 Power factor 0.81 14 Maximum instantaneous downward axial thrust that motor can bear (t) 341
6 Poles  18 15 Maximum instantaneous upward axial thrust that motor can bear (t)
7 Protection(IP) 4 15 Normal axial thrust (t) 24
8 Insulation F 17 Cooling water flow of motor lubricating oil (m3/h)
9 Cooling type Air-Air cooling 18 Cooling water pressure of motor lubricating oil (MPa)

 

4.2.10. Spare parts (see table 16-9).

Table 16-9 spare parts (two units)

No. Name Unit Quantity Remark
1 Water guide bearing Unit 2 Thordon bearings
2 Filler Kg 10  
3 All sealing rings and gaskets Set 4  
4 Water guide bearing sleeve Piece 5  
5 Motor thrust pad Set 1  

 

4.2.11. Special tools (see table 16-10).

Table 16-10 special tools (two units)

No. Name Unit Quantity
1 Hook wrench Piece 2
2 Impeller nut wrench Piece 2
3 Shaft end nut wrench Piece 2
4 Centering wedge Set 2
5 Motor assembly and disassembly of thrust head tool Set 1

 

4.2.12. Summary of supporting auxiliary equipment (see table 16-11).

No. Name Specification Unit Quantity Remark
1 Valves and fittings       See scope of supply for details
2 Matching motor YKKL2150KW/6KV/18P,IP44,F,50Hz Set 4  

 

4.2.13. Pump performance curve. The performance curve of the selected pump is shown in figure 16-8

4.2.14. Appearance. The shape of the selected pump is shown in figure 16-9.

 

5. Scope of supply and general technical specifications

5.1. Scope of supply, termination point and non supply scope (typical scope, which can be increased or decreased according to customer demand)

5.1.1. Scope of supply of equipment, accessories and instruments:

5.1.1.1. Circulating water pump body (including suction bell, outlet elbow and flange, cylinder and inlet cone).

5.1.1.2. Base, anchor bolt assembly, leveling pad and other connecting accessories.

5.1.1.3. Water pump bearing lubricating water system.

5.1.1.4. Motor cooling water system.

5.1.1.5. Motor oil level observation platform and ladder.

5.1.1.6. Coupling and shield.

5.1.1.7. Supporting motor and accessories.

5.1.1.8. Motor CT box.

5.1.1.9. Motor heater.

5.1.1.10. Pump unit temperature measuring instrument (bearing temperature, motor stator winding and motor cooling water temperature measurement).

5.1.1.11. Pressure measuring instrument for pump set (pressure measurement for motor cooling water and pump bearing lubricating water).

5.1.2. Scope of supply of special tools:

5.1.2.1.

5.1.2.2. Rotor lifting tool.

5.1.2.3. Special tools for motor.

5.1.2.4. Assemble and disassemble thrust head and turning tool.

5.1.2.5. Special tools for disassembly and assembly of water pump.

5.1.2.6. Special rack for motor rotor maintenance,

5.1.3. Scope of supply of spare parts

5.1.3.1. Pump guide bearing.

5.1.3.2. Sealing ring, gasket / packing of all pumps

5.1.3.3. Thrust pad

5.1.3.4. Packing sleeve

5.1.3.5. Motor temperature measuring element (different specifications and models)

5.1.3.6. Cooling water inlet solenoid valve

5.1.3.7. Impeller assembly

5.1.4. Termination point of scope of supply

5.1.4.1. Foundation ring of water pump,

5.1.4.2. Embedded parts and ground bolts of pump set.

5.1.4.3. Outlet flange of water pump.

5.1.4.4. Water polymer seal bearing lubricating water interface

5.1.4.5. Motor cooling water interface.

5.1.4.6. Junction box of motor and heater

5.1.4.7. The cathodic protection device of water pump shall be provided by the demander, and the supplier shall provide necessary cooperation.

5.1.5. Non supply scope:

5.1.5.1. Connected power cables

5.1.5.2. Lubricating oil

5.1.5.3. General installation tools

5.1.5.4. General lifting tools

5.1.5.5. Embedded reinforcement.

5.2. General technical specifications

5.2.1. Performance requirements of water pump:

5.2.1.1. The hydraulic performance acceptance test method of the pump shall be carried out according to the provisions of GB / T 3216-2005 (or ISO 9906) rotary power pump slewing performance acceptance test level 1 and 2, and the acceptance level is level 2.

5.2.1.2. The Q-H curve of the water pump rises steadily from the design point to the closing head point, and the Q-H curve of the water pump has only one turning point, which can meet the system resistance requirements in any case and can operate continuously under various design conditions

5.2.1.3. The designed flow difference is limited to 5% when the pumps are running in parallel

5.2.1.4. The vibration measurement and evaluation method of pump shall be carried out according to JB / T 8097 (vibration measurement and evaluation method of pump), and its vibration intensity shall comply with the provisions of level C in JB / T 8097

5.2.1.5) the noise measurement and evaluation method of pump shall be carried out according to JB / T 8098 method for measurement and evaluation of pump noise, and the noise shall reach level C corresponding to corresponding output power and speed.

5.2.1.6. The pump can have good anti cavitation performance when operating at the lowest allowable operating level.

5.2.1.7. The service life of the water pump shall not be less than 30 years (excluding vulnerable parts), and the guide bearing can continuously operate for more than 22000 H. The overhaul period of the pump unit is 5 years, and the minor repair period is 1 year.

5.2.2. Structural requirements / system configuration requirements of water pump:

5.2.2.1. The equipment and its supporting components shall be designed to withstand lateral seismic force. The structural integrity of components or stressed members, non stressed members and their anchorage points with the main structural system can be maintained when subjected to seismic loads.

5.2.2.2. The axial thrust of the pump is borne by the thrust bearing of the motor. The pump manufacturer will provide the maximum axial thrust and equipment dynamic and static loads

5.2.2.3. All parts of the pump set are interchangeable.

5.2.2.4. The pump unit can withstand the reverse speed of 1.2 times of the rated speed. At this time, all parts of the pump set will not be damaged. The pump manufacturer will provide forward torque and speed curve.

5.2.2.5. The forces and moments generated by the pump under various conditions (including closing head and reversing) will be borne by the pump body and transmitted to the pump foundation through support, including the forces and moments caused by earthquake and temperature.

5.2.2.6. The force and moment of the pipe outside the water outlet flange of the water pump will not be transmitted to the pump unit

5.2.2.7. Adjustable nut shall be set under the motor in maintenance layer to adjust the clearance between impeller and impeller chamber.

5.2.2.8. The vertical core pulling pump can not empty the pool water during maintenance.

5.2.3. Technical requirements for water pump components:

5.2.3.1. Impeller. The impeller is made of integral casting, the blade and the hub have large fillet, and the blade has enough stiffness and fatigue strength to ensure that there is no crack, fracture or harmful deformation under the periodic variable load

The impeller is made of materials with good cavitation resistance and wear resistance, and has good weldability at room temperature; the gap between impeller and impeller chamber is uniform.

After the impeller is processed, the dynamic balance test shall be conducted in the manufacturer according to GB / T 9239.1-2006 (or ISO 1940-1:2003) balance quality requirements for mechanical vibration (rigid) rotors Part 1: Specification and balance tolerance inspection, and the balance grade shall not be lower than G6.3 specified in the standard.

5.2.3.2. Pump shaft. The pump shaft is made of high-quality alloy steel or stainless steel, which has enough strength and rigidity, and can bear the torque, axial force and radial force under any working condition.

The sectional position and quantity of the pump shaft can facilitate the disassembly and assembly of the pump unit and the arrangement of the guide bearing. Each sectional shaft is connected by a coupling. The form of the coupling can facilitate the disassembly and assembly of the pump unit and ensure the safe and reliable operation of the pump unit, and ensure the concentricity and straightness of the shaft

The pump shaft and coupling are connected by standardized key and keyway, and the influence of keyway is fully considered for the strength of shaft. The pump manufacturer is responsible for coordinating the connection between the pump shaft and the motor shaft, as well as the design and manufacture of the shafting and the calculation of the critical speed of the pump shaft. The critical speed of the pump shaft should not be less than 1.25 times of the maximum transient speed, and the pump shaft should operate in the maximum speed range without harmful deformation.

The size of the center hole for pump shaft processing can be convenient for processing and testing, and the screw hole for lifting is set at the end of the shaft. The surface roughness of the pump shaft for assembling shaft sleeve and coupling shall not be less than 1.6 μm, and the circular runout shall not be lower than Grade 8 specified in GB / T1184-1996 (or ISO2768-2:1989) shape and position tolerance without tolerance indication.

5.2.3.3. Guide bearing. When the imported ceramic bearing is used as the guide bearing, it can operate safely in the medium containing sediment for a long time without wear and tear. The bearing life is 80000 h, and the dry start-up time is less than 2 min.

The ceramic bearing does not need external lubricating water, but adopts self lubrication of pumped medium; the structure of ceramic bearing should be easy to replace bearing bush.

When water lubricated rubber bearing or high molecular material bearing such as Sialon is used as guide bearing, it has better wear resistance, but the bearing life should meet the requirements of one overhaul cycle.

If additional lubricating water and cooling water are needed for bearings during pump start-up, the water source shall be industrial water, and the pump manufacturer will provide water consumption and water pressure for each bearing; after the pump is started, the external cooling water can be cut off, and the water body of the pump unit can be used for self lubrication and cooling.

A solenoid valve, a flow indicator and a pressure sensor are arranged on the water supply pipe of the guide bearing,

5.2.3.4. Thrust bearing. The position of the thrust bearing is set on the top of the motor or the base of the water pump. The thrust bearing will bear the weight of the rotor of the water pump, the axial force generated by the hydraulic force under various working conditions and the weight of the motor rotor.

The thrust bearing adopts the form of plane sliding thrust pad, adjustable sliding guide pad and rolling bearing.

The thrust bearing adopts oil bath lubrication bearing box, which does not need forced lubrication, and adopts cooling coil or external cooling water of water chamber for cooling.

The thrust bearing is equipped with oil level gauge, Pt temperature detection head of pad, discharge port and oil filler.

5.2.3.5. Main shaft seal. The packing seal adopts carbon fiber material or better fiber material with graphite self-lubricating; the main shaft seal is arranged on the pump cover, which should be tight, wear-resistant, reliable, simple in structure and easy to repair and replace; the sealing gland adopts a split structure to facilitate the replacement of packing; all gland bolts, nuts and screws used for fastening the seal are made of stainless steel.

5.2.3.6. Inlet horn, connecting pipe and outlet elbow. The shape and size of the water pump should ensure that it has good hydraulic characteristics, does not produce harmful vortex and pressure pulsation, and can operate safely and stably without vibration under any working conditions.

The connecting pipe of water pump (i.e. pump shell) shall be of straight cylinder type and segmented connection, and the number of sections shall be convenient for disassembly and assembly; the connection shall be firm; if bolt connection is adopted, stainless steel bolts and nuts shall be used.

The rigidity, strength and straightness of the connecting pipe shall meet the requirements of safe, stable and reliable operation of the pump set, and its inner wall shall be smooth and the hydraulic performance shall be good to ensure that no harmful vibration is generated.

The nozzle shall be a flange plate structure with stiffeners to avoid distortion and deformation under specific pressure and stress, and its parts shall be designed to be easy to assemble, align, dismantle and move.

There should be no supporting rib plate between the core pulling part and the inner wall of the connecting pipe, which will not interfere with each other and cause transverse vibration

The inner wall of the bend at the outlet of the pump should be smooth, and the hydraulic performance should be good, without vibration and other adverse phenomena: the outlet pipe and the outlet elbow of the pump are connected by flange, and the working pressure of the flange is generally 0.6MPa.

5.2.3.7. Pump cover. The main shaft seal, exhaust and make-up valve are arranged on the upper part of the pump cover; the fixed pipe and guide cover are hung in the pump cover, which have sufficient strength and rigidity, and the flow guide hood shall be streamlined to ensure stable flow; the pump cover shall be easy to disassemble and assemble, and the material shall meet the medium requirements.

5.2.3.8. Guide vane body: for the core pulling water pump, the guide vane body is connected with the protective sleeve, which is the non rotating part of the water pump. During the maintenance of the water pump, the non rotating parts of the guide vane body, impeller chamber and casing can be lifted out together with the rotating part of the water pump. The structure of the contact between the guide vane body and the connecting pipe should be reasonable to ensure that the lower part of the guide vane body can be safely, reliably, firmly and accurately located on the connecting pipe, Moreover, the sealing performance of the contact is good without leakage, so as to avoid increasing the hydraulic loss of the water pump and even affecting the normal operation of the water pump; the guide vane body is formed by integral die pressing of steel plate and necessary shape setting treatment is carried out, and the flow passage part shall have good hydraulic performance to avoid vibration caused by vortex belt excitation.

5.2.3.9. Foundation components. The foundation parts include pump base, anchor bolt and connecting bolt. The structure form between the pump body bottom plate and the foundation base is the metal surface densified sealing gasket, which is required to be sealed tightly without water leakage; the contact surface of all parts, including the contact surface between the base plate and the base plate, shall be machined surface and meet the requirements of appropriate roughness: the base plate adopts casting or welding structure. The pump manufacturer shall provide methods and facilities for horizontal adjustment of pump base, embedded parts and bottom plate during installation.

5.2.3.10. Inlet channel and inlet cone: rectangular inlet channel shall be adopted for water inlet of pump, and its shape shall ensure good hydraulic performance, no harmful whirlpool, small hydraulic loss and even flow into the suction pipe of water pump; reliable anti whirlpool equipment shall be installed at the water inlet of water pump, such as setting guide cone at the inlet of horn; The guide cone adopts the structure of casting and welding, and its shape and size are controlled to ensure the water flow into the pump evenly without swirling.

5.2.4 performance requirements of supporting motor:

5.2.4.1. The design of the motor shall be consistent with the operation conditions and maintenance requirements of the water pump, and the characteristic curve (especially the load characteristic curve) of the motor shall fully meet the requirements of the water pump.

5.2.4.2. The output of motor nameplate shall not be less than 115% of that of driving equipment

5.2.4.3. The service life of the motor (excluding vulnerable parts) shall not be less than 30 years, the overhaul period of the pump unit shall be 5 years, and the minor repair period shall be 1 year.

5.2.4.4. The motor shall be provided with insulation of class F and above, and the temperature rise shall not exceed the temperature rise value of class B insulation; the motor winding shall be subjected to vacuum impregnation treatment (VPI).

5.2.4.5. When the voltage and frequency change at the same time, the motor shall be able to carry the rated power; when the frequency is rated, and the deviation between the power supply voltage and the rated value is not more than ± 5%, the motor can output the rated power; when the voltage is rated, and the deviation between the power frequency and the rated value is not more than ± 1%, the motor can also output the rated power.

5.2.4.6. Under rated voltage, the multiple of starting current of motor shall not be greater than 6.0.

5.2.4.7. The motor shall be able to start directly under the rated voltage, and it shall be able to start smoothly when the voltage is no less than 80% of the rated voltage; when the voltage is 65% ~ 70% of the rated voltage, the motor shall be able to start automatically, and the starting time shall not be longer than 20s, and the motor shall be able to withstand the power loss in the process of rapid power supply switching without damage.

The starting time of the motor is less than 2.5 seconds after the first start-up in the cold state, and it can not trip for more than 2.5 seconds after the first start-up in the hot state.

5.2.4.9. The vibration measurement and evaluation method of motor shall comply with the provisions of GB 10068.1-1988 "vibration measurement methods and limit vibration measurement methods for rotating electrical machines", and its vibration intensity shall meet the requirements of level n in the standard.

5.2.4.10. The noise measurement and evaluation method of motor shall be in accordance with GB / T 10069.1-2006 measurement methods and limits of noise emitted by rotating electrical machines Part 1: measurement method for noise emitted by rotating electrical machines, and the noise shall comply with the provisions in GB 10069.3.

5.2.4.11. The water quality of cooler is circulating water filtered water, and the inlet temperature is not higher than 40 ℃.

5.2.4.12. When 1 / 4 of the water cooler is damaged, the motor can still output rated power and ensure that the temperature rise of each part does not exceed the maximum allowable temperature rise.

5.2.4.13. The temperature of motor rolling bearing shall not exceed 90 ℃, the temperature of sliding bearing shall not exceed 80 ℃, and the temperature of oil shall not exceed 65 ℃. The rotation direction of motor shall be marked with water duration and obvious signs.

5.2.4.14. The phase sequence of motor shall be marked in the junction box.

5.2.4.15. The motor shall be able to withstand 150% rated current without deformation or damage under hot state, and the over-current time shall not be less than 30s.

5.2.4.16. Under no-load condition, the motor shall be able to withstand increasing the speed to 120% of its rated value for 2 min without harmful deformation.

5.2.4.17. The maximum reverse speed of the pump set is 120% of the rated speed, and the motor shall be able to start smoothly at the reverse speed of 15% rated speed.

5.2.5. Structure / system configuration requirements of supporting motor:

5.2.5.1. The overall dimension and installation dimension of the motor shall meet the requirements of the water pump supplied.

5.2.5.2. The motor is installed vertically.

5.2.5.3. The motor rotor is of squirrel cage structure, and reliable measures shall be taken to prevent squirrel cage bar breaking.

5.2.5.4 magnetic slot wedge is not used for motor stator slot wedge.

5.2.5.5. The air gap unevenness of the motor shall not be greater than that specified in table 16-12.

Table 16-12 requirements for air gap unevenness of motor

δmm 0.8 0.9 1 1.2 1.4
ε/δ% 17.5 16 15 13 10

5.2.5.6. The motor bearing shall be made of high-quality and wear-resistant products, and the structure shall be sealed to prevent lubricating oil from penetrating into the winding; oil peeping window shall be set to monitor the lubricating oil return of bearing oil.

5.2.5.7. The motor shall be provided with 6 terminals, and the connector for internal wiring and external cable connection shall be provided.

5.2.5.8. Motor protection is IP54.

5.2.5.9. The motor shall be equipped with reliable grounding device and obvious signs indicating grounding.

5.2.5.10. Heater shall be set to prevent internal moisture and condensation during motor shutdown. The heater shall be installed at the position easy to be seen inside the motor.

5.2.5.11. Neutral point CT outlet box shall be set for motor.

5.2.5.12. The motor shall adopt standardized components and equipment components.

5.2.5.13. PT100 double three wire or four wire thermal resistance temperature measuring elements shall be embedded in the local hottest part of the motor stator winding, 2 for each phase and 6 for each set; the temperature measuring elements shall be evenly distributed and embedded between the upper and lower bars in the stator winding slot.

5.2.5.14. The motor bearing temperature measuring element adopts double K-index armored thermocouple, and the motor thrust bearing is equipped with two double branches

One double K-index armored thermocouple is installed on the upper guide bearing and one double K-index armored thermocouple is installed on the lower guide bearing.

5.2.5.15. The thermocouple installed on the motor bearing shall be compressed by spring. The spring must be supported on the bearing shell with enough strength to overcome at least 2 times the thrust force of the maximum vibration of the bearing.

5.2.5.16. Double k-division armored thermocouple measuring elements shall be embedded at the air inlet and outlet and water inlet and outlet of motor cooler.

5.2.5.17. Special temperature measuring element lead-in terminal box shall be installed at appropriate position outside the motor base.

5.2.5.18. If the motor is equipped with oil station, the oil station shall be equipped with temperature, pressure and liquid level switches for protection, interlock and alarm.

5.2.6. Instrument and control requirements:

5.2.6.1. The pump manufacturer is responsible for designing and providing the instruments, control devices and test interfaces for the operation monitoring of the pump set, as well as the alarm, interlock and protection control conditions of the pump set.

5.2.6.2. The local instruments and detection elements provided with the pump unit shall comply with national or international standards, with complete specifications and models; the selection of measuring elements shall meet the requirements of control system.

5.2.6.3. The KKS number, model and specification, installation site, purpose and manufacturer of instruments and control equipment within the scope of supply shall be specified.

5.2.6.4. The accuracy of the local indicating instrument is generally 1.0, and the diameter of the panel is not less than 100 mm. The range of the meter should be selected so that the pointer is at the position of 3 / 4 of the range during normal operation.

5.2.6.5. General requirements for measuring points and instruments, including but not limited to: temperature measurement of motor stator winding and bearing adopts Pt100 thermal resistance; temperature measurement of motor cooling water adopts Pt100 thermal resistance; flow measurement of motor cooling water and pump bearing lubricating water adopts integrated flow switch or transmitter; motor cooling water and pump bearing lubricating water pressure measurement adopts transmitter.