Is it necessary to rotate the multi-stage centrifugal pump regularly before installation?
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It is well known that standby pumps need to be rotated periodically, and this should be done before starting the pump. Today’s topic is whether multi-machine pumps that are not installed need to be turned Why is it necessary to turn the shaft? Some also say that multi-pump units without media installed or filled cannot be rotated manually, as this can easily cause damage. What do you think? Those with experience, please give some guidance. Thank you.
New devices that have not been installed do not require regular turning
If stored for an extended period of time (more than six months), it is necessary to fill the pump body, sealing chamber, and bearing brackets with rust inhibitor. The parts that contain this rust inhibitor (pump body, sealing chamber, bearing brackets) should have the rust inhibitor removed every 6 months and then refilled. To prevent corrosion and rusting of the bearings, the pump should be manually rotated several times after filling it with the rust inhibitor.
Why is it not needed? Could you explain it?
The Starfish moderators have said that regular maintenance should be carried out every 6 months; it is advisable to rotate the rotor by 90% or 180%. In the case of multi-stage pumps, the rotor consists of a flexible shaft. If not used for an extended period of time, the shaft at the impeller area will sag, which may lead to permanent deformation. Therefore, it is necessary to rotate the rotor by a certain angle. Turning the pump is prohibited when there is no fluid inside it! ! Firstly, the sealing surface of the mechanical seal gets dusty, and dry friction can easily cause damage, resulting in leakage once the pump is started again ； Secondly, after not being in use for a long time, the gap at the mouth ring becomes smaller, making it easier for it to get stuck. So within half a year, don’t try to turn the shaft by hand. There are many customers who act in this way – they are extremely stubborn and don’t follow the instructions; they insist on turning it once a week. In the first two months it’s possible to move the shaft, but later they call saying there’s some scratching. Even after the manufacturer warned against turning the pump by hand, they still persist in doing so, and after half a month the shaft gets completely stuck.
If it remains fixed in one orientation for an extended period, it is necessary to rotate the pump shaft to prevent deformation of the shaft.
You can place the pump upright, and then you don’t have to worry about that so much: lol
Nothing has been installed yet; there’s no lubricant either. Turning the shaft by hand can easily lead to shaft damage due to inadequate lubrication, right? ? ?
What Haiyou said earlier is correct – turning the shaft of a device that hasn’t been installed does so to prevent permanent deformation of the rotor after it has been left in that position for a long time. Therefore, there’s no need to do this too frequently; turning it 180 degrees every three to five months is sufficient.