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Precautions For Mechanical Seal Demolition Of Centrifugal Pumps
Feb 27, 2018

Centrifugal Pump Mechanical seal is the most effective method of rotating mechanical body seal, its own processing precision is relatively high, especially the dynamic ring and static ring, if the disassembly method is incorrect or improper use, after assembling the centrifugal mechanical seal not only can not achieve the purpose of sealing, but also damage the combination of sealing components.

Precautions for mechanical seal demolition of centrifugal pumps

Usually in the disassembly centrifugal pump mechanical seals, the use of hammer and flat shovel, to prevent damage to mechanical seals.

If there are mechanical seals at both ends of the centrifugal pump, the removal process must be careful to prevent the other.

For working mechanical seals, if the gland is loose when the seal surface movement, you should replace the static and dynamic ring parts, should not be tightened to continue to use. Because after loosening, the friction pair original movement track will change, the contact surface sealing is very easy to be destroyed.

If the sealing element is bonded by dirt or condensed matter, the condensate should be removed before the mechanical seal is removed.

Precautions for mechanical seal installation of centrifugal pumps

Before installation to carefully check the assembly of the number of sealed parts is sufficient, the components are damaged, especially the dynamic, static ring has no impact, cracks and deformation defects. If there is a problem, repair or replace the new spare parts.

Check whether the chamfer of centrifugal pump sleeve or centrifugal pump gland is appropriate, if not meet the requirements, must be trimmed.

Mechanical seals and related assembly contact surfaces must be cleaned with acetone or anhydrous alcohol before installation. The installation process should be kept clean, especially the dynamic, static ring and auxiliary sealing elements should be free of impurities, dust. A layer of clean oil or turbine oil is applied to the surface of the movable and static ring.

The tightening gland shall be carried out after the coupling is found. Bolts should be evenly tightened to prevent the gland section from deflection, with feeler or special tools to check the points, the error is not greater than 0.05 mm. Check the gland and shaft or sleeve diameter of the matching clearance (and concentricity), must be guaranteed four weeks uniform, with feeler check each point tolerance is not greater than 0.10 mm.

Centrifugal Pump Mechanical seal is the most effective method of rotating mechanical body seal, its own processing precision is relatively high, especially the dynamic ring and static ring, if the disassembly method is incorrect or improper use, after assembling the centrifugal mechanical seal not only can not achieve the purpose of sealing, but also damage the combination of sealing components.

First, the static ring seal the trap in the back of the static ring, and then loaded into the sealed end cover. Pay attention to protect the static ring section, to ensure the static ring section and the end of the center line of the vertical, and the static ring back to prevent the groove of the anti-resale, but do not make contact with each other.

The installation process will not allow the use of tools to directly hit the sealing elements, need to beat, must use a special tool to beat, to prevent the damage of sealing components assembly centrifugal pump All seals should be coated with soapy water and other lubricants, so as to avoid the damage in the assembly process rubber ring. The sealing surface of the static and dynamic ring is coated with grease to prevent the static and dynamic ring sealing face from wearing before the pump is driven.

Floating ring assembly, must be careful not to touch the floating ring spring, so as to avoid the impact of the spring after the floating ring performance. After the floating ring is assembled, you can gently press the floating ring to determine if there is a good floating performance.

Installation of the seal should be handled lightly, to prevent damage to seals, installation should be sealed and the cavity scrub clean.

Fastening the mechanical seal when the fastening bolts should be uniform force to prevent the force does not damage the mechanical seal. For fast-loading mechanical seals in the overall assembly must not forget the positioning of the radial movement of the track away from the shaft position fixed.

Because the mechanical seal sealed the medium is different, the temperature of cold and hot water is different, the sealing medium is corrosive, the chamber pressure is different, the mechanical seal design will be different, the overhaul craft will also have the difference,

Mechanical Seal Repair Process summed up some experience: mechanical seals to be assembled, sweeping inspection mo forget. First look at the two ring after the shaft, scar crack do not leak. Finally in the plastic ring, pore diameter to see. All sizes need to be measured, two ring clearance to be adjusted well. Tight force must check, small spring is the key. The bolt force should be even, take care of the good habit.


Contact Info:

Sales Manager: Doris Sun

Email: doris@mechanicalseal.com.cn

Skype: kathysunlin

Phone No: +8615381220188