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Replacement steps of mechanical seal for kettle

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Replacement steps of mechanical seal for kettle

Date of issue: 2020-02-04 Author: Dongtai Guangming Mechanical Seal Co., Ltd Click:

Mechanical seal for kettle Replacement procedure of

Mechanical seals are very important for chemical pumps, hot water pipeline pumps, and oil pumps. The installation of mechanical seals can enable the pumps to operate without leakage, greatly improving the working environment of pump managers, and extending the service life of pumps.

The following is a detailed explanation of the installation steps of the mechanical seal:

(1) Prepare the workbench (ground) and disassembly tools for placing pump parts, and do not randomly place and use mechanical seals to avoid damaging pump parts.  

(2) Confirm that the motor is in maintenance state before disassembly; Unscrew the filler plug, and use a suction pipe to suck out the lubricating oil in the sealing seat cavity.  

(3) Dismantle the split coupling: unscrew the fixed socket head cap screws of the coupling first, and then gently pull the half of the coupling off the shaft (be careful not to fall off). Use a ring wrench to unscrew the pump shaft fastening bolt and stop block, let the impeller slowly sink to the pump body, remove the other half of the coupling, and remove the pump shaft retainer ring.

 Mechanical seal for kettle

(4) Dismantle the seal seat: unscrew the seal seat compression nut, gently remove the seal seat (note: do not break the rubber oil seal on the seat) and clean it.  

(5) Dismantle and clean the bearing pedestal: loosen the bearing pedestal slightly first, then jack up the bearing pedestal with the disassembly bolts, and lift it up along the pump shaft to remove it; Clean the bearings and seats with jet fuel, dry them before installation and apply a little 20 # machine oil for lubrication and protection.  

(6) Disassembly of mechanical seal: Grasp the seal spring and lift it up along the pump shaft to disassemble it.  

(7) Mechanical seal assembly: apply a layer of clean No. 20 lubricating oil on the mirror surface of the moving and stationary rings; Apply lubricating oil to the guide bearing seat, and first place the stationary ring gently into the guide bearing seat; Then apply lubricating oil on the pump shaft, gently install the moving ring part of the mechanical seal onto the pump shaft, and gently push the seal ring by hand to make it flexible (pay attention to the anti rotation parts of the moving and stationary rings to be assembled in place).  

(8) Install the seal seat: first install the rubber oil seal on the seal seat, then install the seal seat into the pump cover and press it on the bearing seat, and tighten the nuts.  

(9) Install the coupling: first install the retaining ring on the motor shaft head, install half of the coupling, then install the stop on the pump shaft end and the coupling groove and tighten the bolts with a box wrench (lift the pump shaft 3~5mm and provide mechanical seal prestress); Then install the other half of the coupling and tighten the hexagon socket head cap screws. Correct inspection requirements for installing coupling: the upper and lower clearance of split coupling shall be even; Turn the coupling several turns by hand to check whether it can rotate flexibly.  

(10) Run in according to the key points to check whether the replacement mechanical seal is correct and whether the pump unit operates normally.

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