1、 Overview

MC pump is a horizontal multi-stage centrifugal pump with a radial sectional and segmented structure. Mainly suitable for transporting clean or slightly contaminated liquids; Low temperature or high temperature liquids. Generally used in water supply systems, thermal power plants, pipeline pressurization, and refrigeration engineering. When the pressure of the conveying medium is high, the working temperature of the medium and the material used in the pump should be considered. Flow rate~1000 m3/h Head~1600 m Temperature -80~+180 ° C Pressure~150 bar

2、 Purpose:

Mainly used for:

Water supply equipment, thermal power plants, pipeline pressurization, refrigeration engineering, refineries, petrochemical industry, etc

3、 Performance Range

Performance range 50 Hz

Performance range 60 Hz

4、 Design Features

The components of each specification of MC multi-stage centrifugal pump are designed with universal standard sizes, which can reduce the quantity of spare parts in inventory.

Mid section shell: The middle section is sealed with an O-ring and connected together with bolts on the outside of the middle section.

Entrance and exit sections: Entrance and exit sections are usually supported by feet.

When the temperature of the conveyed liquid t is greater than 150 ℃, pumps with specifications above MC80 are used as the center support.

When t>110 ℃, pumps with specifications above MC150 are supported at the center.

The position of the inlet and outlet pipes: Usually, the orientation of the outlet pipe is upward, and the orientation of the inlet pipe is upward (when viewed from the direction of the drive end).

The position of the inlet and outlet pipes can be freely changed and allows for the installation of outlet pipes for other purposes on the object.

Hydraulic model and axial force balance: Each specification has two different sets of impellers/guide vanes (hydraulic model). Therefore, the high efficiency zone is large. The replaceable mouth ring plays a sealing role between the impeller and the housing, and the axial force generated by each stage of the impeller is balanced by the hydraulic balance device. If a balance drum device is used to balance the axial force, the residual axial force is borne by the bearing.

Bearings and lubrication: The pump adopts thin oil lubrication.

Shaft seal: packing seal or mechanical seal.

Material: Currently, corrosion-resistant materials can fully meet the requirements of various media mentioned above. When placing an order, please provide detailed information about the medium to be conveyed.

5、 Structural schematic diagram

6、 Features and advantages

1. Shell support

Under large specifications and high temperature conditions, center support can be used.

2. Pipe mouth

A large inlet diameter can optimize the flow state of the inlet

By reducing the flow velocity in the channel, the noise level can be lowered

• Allow for higher forces and moments

3. Impeller

Modular hydraulics enable pumps to have higher efficiency over a larger operating area

The required NPSHR for the first stage is lower, and some specifications of pumps can choose the first stage double suction impeller.

4. Axis

The rigid shaft design ensures that the critical speed is higher than the operating speed, and the shaft deflection is extremely small,

Wear and tear areas are protected

5. Oral Ring

• Maintain high efficiency during the usage period

Low maintenance cost, high reliability, and short downtime

6. Axial thrust balance system and bearings

The design of the balanced drum with axial thrust bearings ensures that the pump can maintain a long service life even under extreme operating conditions,

During frequent start stop operations, a balance disk with thrust protection device can be selected,

Sliding radial bearings are optional designs

7. O-ring

The housing is sealed by a restricted O-ring, so the housing seal is not affected by rapid temperature changes and high pressure.

8. Sealed enclosure

• Adequate cooling

Easy to install water-cooled chamber structure

7、 Maintenance of MC type multi-stage pump

1. Preparation before maintenance:

1) Fault diagnosis and analysis,

2) View relevant technical materials,

3) Spare parts preparation (O-rings, bearings, machine seals, gaskets, etc.)

4) Development and approval of maintenance plans, technical briefing.

2. Maintenance:

Dismantling:

1) Process isolation, clean up and deliver for maintenance, and handle corresponding power outage and maintenance work tickets,

2) Preparation of tools required for maintenance,

3) Mark properly, remove the coupling and accessory pipelines

4) Make axial and alignment records, remove the bearing boxes, bearings, and machine seals at the drive and non drive ends, record the position of the adjusting shims, and mark the impeller shaft sleeves of the machine seals at the drive and non drive ends. Remove the balance drum and balance sleeve,

5) Dismantle the bolts of the bar and the anchor bolts step by step, and mark and arrange the snail shell, guide vanes, and impeller neatly,

6) Clean and polish the impeller and guide vane ring, balance drum, balance sleeve, and pump shaft,

7) Support the shaft at the bearing location (using V-shaped iron) and use a dial gauge to check for runout ≤ 0.025mm,

8) Measure whether the clearance between the mouth ring and the balance drum meets the requirements (refer to the operation manual)

Secondary installation:

1) Symmetrically tighten the threaded bolts of the impeller, guide vanes, and volute in stages, install the balance drum, and check for any jamming of the disc drive. Use a dial gauge to measure the total axial displacement,

2) Install the sealing shaft sleeve, adjust the gasket, baffle plate, and non drive end bearing box. Push the shaft to the non drive side until it can no longer be pushed. Use a depth gauge to measure the dimension A from the bottom of the bearing frame to the shaft retaining sleeve (refer to the operation manual),

3) Install non drive end and drive end machine seals, bearing boxes, bearings, check for any jamming in the disc drive, and restore the auxiliary pipelines,

4) Align, add oil to the bearing box,

5) Clean up the maintenance site, open the valve for leakage testing,

3. Test drive:

1) First, try to confirm the steering and whether there are any abnormalities,

2) 40 minutes before operation, a dedicated person will monitor and record the bearing temperature and vibration.

For example: 51P005: Model: MB80-230/6 Flow rate: Q=113.4m3/h Pressure difference: △ P=3.134MPa

Gap between mouth rings	MB50/80	material
(New part) Small diameter gap (mm)	0.3	cast iron
	0.45	stainless steel
(Wear parts) Large diameter gap (mm)	0.6	cast iron
	0.9	stainless steel

Large clearance between balance drum and balance sleeve: MB80: 0.4 mm cast iron

0.5mm stainless steel

The dimension from the bottom of the bearing frame to the shaft retaining sleeve is A=3.5 mm

8、 Application of MC high-pressure multi-stage pump

1. Solid organic fuel combustion power plant boiler feedwater pump

The boiler feedwater pump used for biomass combustion power generation plant applications is generally a small/medium-sized segmental pump. If necessary, a horizontally split multiphase pump can also be used. The size and design pressure of the pump mainly depend on the type and output of the power plant.

2. Solid state city or industrial waste fuel combustion power plant boiler feedwater pump

The boiler feedwater pump used for biomass combustion power generation plant applications is generally a small/medium-sized segmental pump. If necessary, a horizontally split multiphase pump can also be used. The size and design pressure of the pump mainly depend on the type and output of the power plant.

3. Gas power plant feedwater pump

The feedwater pump is used to pump feedwater from the deaerator to the boiler through the HP heater. The important feature of FWP is its significantly different head. In gas combined cycle power plants of various scales, FWP will use horizontal segmental pumps; Occasionally, cylinder bag pumps or horizontal split pumps are also used.

4. Suitable for saltwater reinjection pumps of organic Rankine or Karina cycles in binary cycle geothermal power plants

The brine reinjection pump is used to inject low enthalpy waste brine back into geothermal fields to update available resources.

5. Salt water reinjection pump suitable for dry rock enhanced geothermal systems (EGS)

The brine reinjection pump is used to inject low enthalpy waste brine back into geothermal fields to update available resources.

6. Salt water reinjection pump suitable for flash evaporation/binary cycle geothermal power plants

The brine reinjection pump is used to inject low enthalpy waste brine back into geothermal fields to update available resources.

7. Salt water reinjection pump suitable for flash evaporation steam geothermal power plants

The brine reinjection pump is used to inject low enthalpy waste brine back into geothermal fields to update available resources.

8. Liquid or gaseous organic fuel combustion power plant boiler feedwater pump

The boiler feedwater pump used for biomass power plant applications is generally a small/medium-sized segmental pump. If necessary, a horizontally split multiphase pump can also be used. The size and design pressure of the pump mainly depend on the type and output of the power plant.

9. Water supply pump for trough solar power plants without heat storage devices

The feedwater pump is used to pump feedwater from the deaerator to the solar steam generator through an HP heater. The main characteristic of a feedwater pump is its varying head. The feed pump is usually a horizontal segmental pump, but according to customer requirements, a cylindrical pump or a horizontal sectional pump can also be used.

10. Water supply pump for the central tower of a solar telescope with molten salt and heat storage device

The feedwater pump is used to pump feedwater from the deaerator to the solar steam generator through an HP heater. The main characteristic of a feedwater pump is its varying head. The feed pump is usually a horizontal segmental pump, but according to customer requirements, a cylindrical pump or a horizontal sectional pump can also be used.

11. Water supply pump for trough solar power plants with molten salt heat storage devices

The feedwater pump is used to pump feedwater from the deaerator to the solar steam generator through an HP heater. The main characteristic of a feedwater pump is its varying head. The feed pump is usually a horizontal segmental pump, but according to customer requirements, a cylindrical pump or a horizontal sectional pump can also be used.

12. Feedwater pump for the central tower of a heliostat with a direct steam generator (DSG)

The feedwater pump is used to pump feedwater from the deaerator to the solar steam generator through an HP heater. The main characteristic of a feedwater pump is its varying head. The feed pump is usually a horizontal segmental pump, but according to customer requirements, a cylindrical pump or a horizontal sectional pump can also be used.

13. Feedwater pump for hybrid integrated solar combined cycle (ISCC) power plants

The feed water pump (FWP) is used to pump feed water from the deaerator to the solar steam generator through an HP heater. The main characteristic of a feedwater pump is its varying head. The feed pump is usually a horizontal segmental pump, but according to customer requirements, a cylindrical pump or a horizontal sectional pump can also be used.

14. Feedwater pump for linear Fresnel solar power plant

The feed water pump (FWP) is used to pump feed water from the deaerator to the solar steam generator through an HP heater. The main characteristic of a feedwater pump is its varying head. The feed pump is usually a horizontal segmental pump, but according to customer requirements, a cylindrical pump or a horizontal sectional pump can also be used.