packing - lantern rings
packing - lantern rings
(OP)
This is actually for a Lightnin mixer shaft rather than a pump shaft but it is the same concept.
We have a 1 1/2" Lightning mixer shaft with a set of braided square packing rings. We also bought a plastic lantern ring for $200.00. Recently, my boss found a brass lantern ring for $1,000.00.
Is a brass lantern ring better than a plastic lantern ring? What other kinds of lubrication arrangements can we make to make the plastic lantern ring last longer?
What are your experiences with plastic versus brass lantern rings?
Thanks
We have a 1 1/2" Lightning mixer shaft with a set of braided square packing rings. We also bought a plastic lantern ring for $200.00. Recently, my boss found a brass lantern ring for $1,000.00.
Is a brass lantern ring better than a plastic lantern ring? What other kinds of lubrication arrangements can we make to make the plastic lantern ring last longer?
What are your experiences with plastic versus brass lantern rings?
Thanks





RE: packing - lantern rings
RE: packing - lantern rings
More detail required as to the problem.
RE: packing - lantern rings
RE: packing - lantern rings
RE: packing - lantern rings
We had this funny thing of replacing only the top three rings (in my first company, about 12 years back)whenever there was leakage. There were occasions when we had to cut the shaft and then lift the stuffing box because sledge hammers were too weak. I still remember that after changing the packings from asbestos to graphited PTFE/Aramid, things improved.
I would like to suggest the OP to look into mechanical seals, rather.
RE: packing - lantern rings
One other point occurred to me. You need to be sure that the shaft is running true through the packing case. A shaft that is bent, rough or off center through the packing case could cause problems with leakage that could then cause you operators to over tighten the packing.
If you pass all these tests and still have problems, then I would purchase the brass ring. The plastic ring could be intended for clean cold service. It may be that your service is too hot, abrasive, corrosive, or chemically incompatible with the plastic ring.
Johnny Pellin