For pumps with significant shaft wear, how can it be repaired?
Thread Content
Dear experts, during operation, due to untimely maintenance, severe wear on shafts is often observed. Today, two such incidents occurred with the equipment under my responsibility! In a pump, at the connection between the impeller and the shaft, the shaft is worn unevenly by 50 microns. At the interface between the lubricating oil seal and the shaft in one unit, there is 20 microns of wear. When I contacted the manufacturer, they said it could be used temporarily, but in the end the shaft still has to be replaced! Have the experts seen any other repair methods? Please give some advice!
The specific shaft is worn out; the problem lies in the positioning issue, and this positioning should relate to bearing alignment. If the positioning is accurate, the shaft will not wear out. Hehe, you admit it’s due to delayed maintenance – so focus on improving that aspect. For now, just keep things running as long as possible. Do what needs to be done; failing to do so means accumulating debts, and too many debts will lead to problems.
Prepare a spare parts plan; replace it. Many companies in the country do this: they don’t purchase spare parts and wait until the equipment breaks down before asking the manufacturer to fix it by a certain date. Everything requires a process; components need time for processing, and heat treatment also takes time. If you want the device to operate smoothly, please replenish your spare parts inventory.
In our factory, we first perform surfacing welding and then machine it on a lathe
There is wear at the point where the shaft contacts the impeller; right below that is the bolt hole for the impeller. There is a concern that surfacing treatment could cause thermal deformation of the shaft, and it is also possible that the bolt hole could be affected! Moreover, this is the rotor of a canned motor pump; 20 centimeters away from here lies the rotor winding, and high temperatures could also affect the proper operation of these windings!
Spare parts usually refer to those that are prone to damage. When I suggested buying a rotor, the manager said, \"Why don’t you just buy an entire pump instead?\"
In addition to routine maintenance for issues that arise, we also carry out planned maintenance. The maintenance workers at our factory are hired from outside, and their skills are average; the systems and procedures in place are also poor, so there are always various problems!
I’m sorry, for some of the critical pumps in our company, we have one entire spare pump available. Of course, most of us operate with a single pump, so we have one as a backup.
The repair of the pump shaft in shielded pumps, as you mentioned, is not easy to handle; even if it’s possible to carry out such repairs, the cost will likely be high, and the pump may not perform properly during operation afterward. It’s better to strengthen inspections and hurry up with purchasing the parts.
https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=2004219
You’re right to mention the rotor; managers don’t take these things into account – this is what’s known as cost control. If the device is making money but stops operating because the necessary spare parts were not purchased. The people in charge above won’t talk to your boss about cost control.