Overview of IH Chemical Pump

IH type chemical pump is a single-stage single suction cantilever centrifugal pump, which is marked with rated performance points and size equivalent to the international standard ISO2858-1975 (E). It is an energy-saving product used to replace F-type corrosion-resistant pumps and is suitable for conveying corrosive media with temperatures ranging from -20 ℃ to 105 ℃ or media with physical and chemical properties similar to water in the chemical, petroleum, metallurgical, power plant, food, pharmaceutical, synthetic fiber and other sectors.

Performance range of IH type chemical pump (according to design points)

Flow rate Q: 6.3-400 m3/h

Head H: 5-125m

The high working design pressure of the pump is 1.6MPa

Users can choose different materials for the main components of the pump's overcurrent section based on the corrosiveness level of the conveyed medium.

There are five types of materials and their codes for the main components of the overcurrent part of the pump:

The temperature of the medium conveyed by the IH chemical pump ranges from -20 ℃ to 105 ℃. If necessary, a double end sealed cooling device can be used to transport the medium at a temperature of 20 ℃ to+280 ℃. Suitable for industries such as chemical, petroleum, metallurgy, power, papermaking, food, pharmaceuticals, environmental protection, wastewater treatment, and synthetic fibers for transporting various corrosive or non polluting media similar to water.

Performance range of IH type chemical pump

Traffic Q: 6.3~400m3/

Head H: 5-132m

Speed n: 2900, 1450r/min

Equipped with power: 0.55~110KW

Imported diameter: 50-200mm

High work pressure: 1.6Mpa

There are 29 basic types of IH chemical pumps, among which 22 dual speed (2900, 1450r/min) have been modified by cutting the impeller diameter of two types A and B, reaching 112 specifications.

Structure of IH type chemical pump

IH type pump is a series of products jointly designed by ISO international standards in the national pump industry. It mainly consists of pump body, blade transmission line, sealing ring, impeller nut, pump cover, sealing components, intermediate bracket, shaft, suspension components, etc.

Structural characteristics of IH type chemical pump

The pump cover is fixed on the middle bracket through a stopper, and then clamped in the middle through the connection between the pump body and the stopper of the middle bracket. The pump body is axial suction, radial discharge, foot supported, and can be directly fixed on the base. The suspension components are fixed to the middle bracket through a stopper and supported on the base by the suspension bracket. For the convenience of disassembly, an extended coupling has been designed, which allows for maintenance without disassembling the inlet and outlet connecting pipelines, pump body, and motor. Simply remove the middle connecting piece of the coupling to exit the rotor component for maintenance. This is an internationally recognized structural form.

Rotation direction of pump

The pump is directly driven by the motor through an extended coupling, and when viewed from the motor end, it rotates clockwise.

Pump shaft seal type

Packing seal: The pump cover is equipped with a packing box, which uses soft packing seal. The packing box can be filled with water under certain pressure for sealing cooling, lubrication, and cleaning.

Mechanical seal: There are two types of mechanical seals: single end mechanical seal and double end mechanical seal. A certain pressure of water is introduced into the sealing chamber to flush and rub the two end surfaces, while also providing cooling effect.

The sealing type of the pump adopts packing seal or mechanical seal, which can be applied by the user according to their needs. At the same time, it is allowed to use shaft seal types that are suitable for the sealing cavity size and other structures specified in ISO3069, such as mechanical seals with corrugated pipes and impeller seals.

working conditions

Flow rate Q: 6.3-400m3/h

Rotation speed N: 2900-1450r/min

Caliber DN: 50-200mm

Head H: 5-125m

Equipped with power: 0.55-90kw

Work pressure P: 1.6Mpa

Model Meaning

For example: IH50-32-160

IH International Standard Single stage Single suction Chemical Centrifugal Pump

50- Inlet diameter (mm)

32- Discharge outlet diameter (mm)

160- nominal diameter of impeller (mm)

Performance parameters of IH type chemical pump

IH type stainless steel chemical centrifugal pump (disassembly and assembly, starting, running, and stopping)

Disassembly and Assembly Disassembly

Due to the use of an extended coupling, there is no need to disassemble the inlet and outlet pipelines, pump body, and motor when disassembling the pump. Only the middle coupling in the extended coupling needs to be removed to disassemble the rotor components for repair and maintenance.

1. Remove the drain pipe plug on the pump body and the drain pipe plug on the suspension body, and drain the liquid inside the pump and the lubricating oil inside the suspension body. (Note: If there are additional pipelines on the pump, they should also be removed).

1. Disconnect the connection between the pump body and the intermediate bracket, and remove all rotor components such as the intermediate bracket, suspension components, and pump cover from the pump body together.

2. Remove the impeller nut, remove the impeller and key.

3. Remove the pump cover, coaxial sleeve, mechanical seal end cover, and mechanical seal from the shaft together. Be careful not to slide the shaft sleeve relative to the pump cover, and then remove the mechanical seal end cover. Remove the mechanical seal together with the shaft sleeve, and then disassemble the shaft sleeve and mechanical seal.

If the seal uses packing, the shaft sleeve can be directly removed from the pump cover, and then the packing cover, packing, and packing ring can be removed in sequence. If the seal adopts a special structure, attention should be paid to different disassembly methods.

4. Remove the middle bracket and suspension bracket.

5. Remove the pump coupling and key.

6. Remove the dust discs at both ends of the suspension body and the front and rear covers of the bearings, and then remove the shaft and bearings from the suspension body together.

7. Remove the bearing from the pump shaft.

The assembly and disassembly procedures are carried out in reverse.

Start, Run, and Stop

1. Preparation before starting

1) Before starting, clean the pump and the site thoroughly.

2) Check if the lubricating oil level in the bracket is appropriate (the oil level is about 2mm from the centerline of the oil level gauge) and if the oil level gauge is intact.

3) Before connecting the coupling, check the direction of the prime mover and align it with the pump's direction arrow before connecting the coupling.

4) After installing the mechanical seal or packing and coupling, the pump shaft can be manually rotated without any rubbing, and the protective cover of the coupling should be installed properly.

5) When using the pump with suction, it should be filled or evacuated before starting; When using the pump in reverse flow, fill the pump with the conveyed liquid before starting, remove the air from the pump, and then close the gate valve of the discharge pipe.

6) Before starting, check if the basic screws are loose. Whether the gland is skewed, and the supply of lubricating oil and cooling water.

2. Start up

1) Close the inlet and outlet pressure (or vacuum) gauges and outlet valves (if there is a bypass pipe, it should also be closed at this time). Start the motor (it is recommended to jog and confirm that the pump direction is correct before starting the formal operation), then open the inlet and outlet pressure (or vacuum) gauges. When the pump reaches normal speed and the instrument indicates the corresponding pressure, slowly open the outlet valve and adjust it to the required working condition. When the discharge pipeline is closed, the continuous working time of the pump cannot exceed 3 minutes.

2) During the starting process, attention should be paid to the power reading of the prime mover and the vibration of the pump at all times. The vibration number should not exceed 0.06 millimeters, and the measuring part is the bearing seat.

3) Sealing condition: The mechanical seal should have no leakage or heating phenomenon, and the packing seal should be in a continuous dripping state.

3. Run

1) Regularly check the heating condition of the pump and motor (the temperature rise of the bearings should not exceed 75 ℃) and the oil supply of the oil level gauge. Generally, after running for 1500 hours, all lubricating oil should be replaced once

2) Do not use suction valves to regulate flow to avoid cavitation.

3) Pumps should not operate continuously at flow rates below 30%. If continuous operation is necessary under these conditions, a bypass pipe should be installed at the outlet to discharge excess flow.

4) Pay attention to whether there is any noise during the operation of the pump. If any abnormal state is found, it should be eliminated or stopped for inspection in a timely manner.

4. Stop

1) Slowly close the gate valve of the discharge pipeline (if the pump is used in reverse flow, also close the gate valve of the suction pipeline), and turn off the switches of various instruments.

2) Cut off the power supply

3) If external drainage is used for sealing, the external drainage valve should also be closed.

4) If the ambient temperature is below the freezing point of the liquid, the liquid in the pump should be drained to prevent freezing and cracking.

5) If parked for a long time without use, in addition to draining the corrosive liquid inside the pump, all components should be disassembled and cleaned, especially the sealing chamber. It is recommended to remove, clean, and reinstall the pump. In addition to applying oil and rust prevention treatment and sealing the pump inlet and outlet, regular inspections should also be conducted

precautions

This model of pump can be equipped with different forms of mechanical seals according to different usage conditions, such as internal single end balanced and unbalanced, double end balanced and unbalanced, external mechanical seals, etc. According to the different sealing types selected, their usage methods and precautions also vary. For specific details, please refer to the installation and use manual of mechanical seals and GB3215-82 "General Technical Conditions for Centrifugal Pumps Used in Refineries, Chemical and Petrochemical Processes". Below are only a few general precautions to be taken.

1. As mechanical seals are generally suitable for use in clean, non suspended media, newly installed pipeline systems and liquid storage tanks should be thoroughly flushed to prevent solid impurities from entering the mechanical seal end face and causing seal failure.

2. When using mechanical seals in media that are prone to crystallization, attention should be paid to frequent flushing. Before restarting after parking, clean the crystals on the mechanical seal.

3. When disassembling mechanical seals, one should be careful and not use hammers, irons, or other tools to strike them, in order to avoid damaging the sealing surfaces of the dynamic and static rings.

If there is dirt that cannot be removed, try to remove the dirt, rinse it clean before disassembling to avoid damaging the sealing components.

Before installing the mechanical seal, all sealing components should be checked for failure or damage, and if so, they should be repaired or replaced.

6. The relative friction sealing surface between the moving ring and the stationary ring should be strictly inspected, and no minor scratches, bumps, or other defects are allowed. All other components, including the pump body, impeller, sealing chamber, etc., should be rinsed thoroughly before assembly, especially the dynamic and static ring end faces. They should be carefully wiped clean with a clean, soft cloth or cotton yarn, and then coated with a layer of clean grease or engine oil

7. During assembly, attention should be paid to eliminating deviations. When tightening screws, they should be tightened evenly to avoid deviation and seal failure.

8. Adjust the compression amount of the sealing spring correctly. After the pump is installed, when manually pulling the rotor, you should feel that the sealing spring has a certain compression amount and can rotate quickly and flexibly without feeling tight. If it feels too tight or cannot be moved, it should be loosened appropriately.

9. For mechanical seals with external flushing, the flushing wave should be turned on before starting to fill the sealing chamber with sealing liquid. When parking, stop the pump first and then turn off the sealing flushing liquid.

Malfunctions and troubleshooting