lateral shaft movement? in 3800 GPM pump, mechanical seals, leaking and unknown cause of lateral shaft movement in a Weinman centrifugal pump , VFD driven
any thoughts?
Not enough information provided for us to make a meaningful answer. But, these games can be fun. I will take a wild guess and you tell me if I am in the ballpark.
Maybe this is a between bearings pump that was originally built with packing but later converted to mechanical seals. Maybe the shaft stiffness is inadequate without the extra support of the original packing. Maybe the operating conditions have changed and you are operating the pump too close to rotor critical speed. Maybe the impeller was very poorly balanced at the last repair. Maybe the shaft is bent. Maybe . . .
Tell us more about the pump and service and maybe we won't have to guess.
Agree with JJPellin more information is necessary. Is it a split case or end suction or vertical in-line centrifugal. About 14 years ago I worked at Crane Pumps which manufacturers the Weinman pump brand.
Post some photos of the pump and I along with the other people with access to this site could give you some idea for troubleshooting.
Crystal ball available for hire, please contact for more detail.
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
I'll check back after 10 or 20 insightful, probing questions have been proposed by the crew, and answered by OP.
There should probably be a few questions about the seal type, and significant detail about the nature of the seal leakage and the condition of the actual leaking seal components