We want to use Polyurea grease for continous cater in steel plant. Present lubricant is a lithium base grease. The grease will be pump by cetralized lubrication system. Do we need to flushing or cleaning the bearings before using a polyurea grease or not? Also what will be the advantage if we switch from a lithium base grease to plyurea grease? If you are having any case study or experience please let me know.
Posts: 1 | Location: Mumbai India | Registered: Wed June 13 2007
Many of the newer shear stable polyurea greases are compatible with lithium thickeners. It is also called di-urea thickener. I have checked with my lubricant vendor and the lithium/di-urea thickened greases we are using from him are compatible as long as the lubricating oils are compatible. If this is a traditional polyurea, I would flush the length of the central lubrication system and clean/repack any critical bearings.
I have had horrible results from mixing older polyurea grease with lithium thickened greases where the bearings seized within a day of greasing.
More recently, I have found bearings that had polyurea thickened greases mixed with lithium thickened grease with no apparent problem. The unit was disassembled for reasons not related to bearings.
Ken Culverson
Posts: 5 | Location: North Georgia | Registered: Mon May 21 2007
May I know the reason why you want to change? Is the temperature over 100`C? How about the other lube points connected to your centralized lubrication machine? Does it needs polyurea also? There are other options to consider before changing, polyurea is twice higher than lithium base.
Regards, Danny
Danny Reyes Memolub Distributor, UAE www.memolub.be +971 50 9921518
I am also curious as to why you are changing grease types. Are you having problems with your current grease? Often times just changing grease types will not fix a problem. What is the application?
We ahev a recent example in India (TATA steel) who changed from a Lithium Complex to Polyurea (Matrix Grease Poly HT plus 2) without any problems. The grease solved a lot of issues including bearing failure, fires (due to the lower flash point of the Li complex grease) and centrale system pumping issues. Currently availabel Urea thickeners generally do not cause problems when changed from Li Complex. I can provide you with more details on the grease if you like. www.lubes-portal.com
Best regards
Perry Peters
quote:
Originally posted by A.P.Pandey: We want to use Polyurea grease for continous cater in steel plant. Present lubricant is a lithium base grease. The grease will be pump by cetralized lubrication system. Do we need to flushing or cleaning the bearings before using a polyurea grease or not? Also what will be the advantage if we switch from a lithium base grease to plyurea grease? If you are having any case study or experience please let me know.
Hi, Why do you want to use polyurea grease? PU grease can block the central lubrication system due to non melting thickener. I recommend to run trials with Al-Complex thickener.
in addition to my last email I like to remark that that we alredy have experinence for many year in steel making earea. We sell big volumes of Al-complex greae for continous caster. If you need more information about our grease product portfolio specially developed for the steel insustry pls don't hestitate to get in touch with me.
Kind regards
quote:
Originally posted by A.P.Pandey: We want to use Polyurea grease for continous cater in steel plant. Present lubricant is a lithium base grease. The grease will be pump by cetralized lubrication system. Do we need to flushing or cleaning the bearings before using a polyurea grease or not? Also what will be the advantage if we switch from a lithium base grease to plyurea grease? If you are having any case study or experience please let me know.
