Recently encountered a bearing failure that resulted from apparent lack of lubrication in a pump that had no previous problems in this area. The bearing housing is sump type with oil rings and Trico optomatic oiler. Older machinery guru mentioned an "oil siphon", where an oil leak along the...
johnny
any possibility of entrained gas in your suction stream, perhaps from nitrogen/gas blanket or other gas/liquid interface in the process? Entrained gas can cause cavitation symptoms and damage even with adequate NPSH margin and near BEP operation.
An issue we have seen with Sundyne units...
Depending on the thrust characteristics of the pump (which can vary depending on wear ring clearance, interstage bushing clearance if multistage, and point of operation on the pump curve, amongst other things), with a set of 40 degree contact angle thrust bearings with no preload it is highly...
On several centrifugal end suction pump of varying manufacturers, design conditions, etc., have recent problem of impeller nuts coming off shaft, followed by impeller, with associated damage to casing, impeller, shaft, etc.
Nuts are threaded opposite normal pump rotation direction and have...
