Pure oil Mist lubrication
Pure oil Mist lubrication
(OP)
It is told that Pure oil Mist lubrication is not suitable for the High speed pumps. Why? Pl advise.
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
Pure oil Mist lubrication
|
Pure oil Mist lubricationPure oil Mist lubrication(OP)
It is told that Pure oil Mist lubrication is not suitable for the High speed pumps. Why? Pl advise.
Red Flag SubmittedThank you for helping keep Eng-Tips Forums free from inappropriate posts. Reply To This ThreadPosting in the Eng-Tips forums is a member-only feature.Click Here to join Eng-Tips and talk with other members! |
ResourcesWhat is rapid injection molding? For engineers working with tight product design timelines, rapid injection molding can be a critical tool for prototyping and testing functional models. Download Now
The world has changed considerably since the 1980s, when CAD first started displacing drafting tables. Download Now
Prototyping has always been a critical part of product development. Download Now
As the cloud is increasingly adopted for product development, questions remain as to just how cloud software tools compare to on-premise solutions. Download Now
|
RE: Pure oil Mist lubrication
Compare it to the alternatives.
One alternative is to have the lowest rolling element partially submerged in oil. That causes friction from chruning in high speed applicaitons.
Another alternative is to use some kind of oil ring or flinger ring. These are trying to do roughly the same thing as the oil mist (ensure that some minimum quantity of oil is available) but the oil mist does it more effectively and reliably.
In other applications oil such as journal bearings, oil functions to remove heat from the bearing. I wouldn't hink this is much of a factor in rolling bearings. I would think if the bearing was in contact with enough oil to be removing significant heat it would also be increasing friction.
=====================================
Eng-tips forums: The best place on the web for engineering discussions.
RE: Pure oil Mist lubrication
=====================================
Eng-tips forums: The best place on the web for engineering discussions.
RE: Pure oil Mist lubrication
Opinion only
Rgds Wimple
RE: Pure oil Mist lubrication
RE: Pure oil Mist lubrication
psafety
RE: Pure oil Mist lubrication
RE: Pure oil Mist lubrication
Back to the original question, I have never applied pure oil mist to a "high speed" machine. The highest speed we have is probably 3600 rpm. But, I have never seen any prohibition against pure mist at higher speeds. A bearing lubed with pure mist will run cooler, run cleaner and last longer. This suggests that higher speed would be a better application for pure mist than lower speed. Contact the manufacturer of the mist system to get their recommended application limits for speed. The two systems I am familiar with were made by Alemite and Lubrication Systems.
Johnny Pellin
RE: Pure oil Mist lubrication
I personally have taken mineral oil CCFP 350-degF + and turned it into a viscous flame thrower by adjusting the air/oil ratio. The closer to an aerosol type mist the more flammable. I increased the oil/decreased the air till the droplets were larger and had the small flames stairstep right up to nozzle. All ignition was with the use of a torch striker (sparker).
I did not watch someone else, I performed the tests. It will and does happen!!
Don Coffman
RE: Pure oil Mist lubrication
Johnny Pellin
RE: Pure oil Mist lubrication
The system I refer is in fact an oil mist unit that was to be used on low-speed line shaft bearings in a paper converting operation. Static electricity in this area/part of the country is extreme in the winter. This unit was not monitored.
In process safety; if it can happen it will. I refused to allow this unit to be installed. I only relay my own experience. Mists of any combustible is a hazard. NFPA has chapters on this (or did). I have researched and this is a well documented flammability concern (in the correct concentrations).
I do NOT want to get into an argument, but IF a material will burn, flammability should be a concern. I have been involved in the design of combustible dust & gas/vapor explosion protection systems for many years and speak from that experience.
Maybe your monitoring will control the hazard to the satisfaction of all.
Don Coffman
RE: Pure oil Mist lubrication
Johnny Pellin
RE: Pure oil Mist lubrication
RE: Pure oil Mist lubrication
Just to back up the safety of a well-engineered system. A large percentage (I believe ~40%) of the refining capacity in the U.S. is operating with the pumps on pure oil mist lubrication. I am not aware of a single incident where the oil mist ignited. As Mr. Pellin says, it is too lean to support combustion.
I also do not believe there is a prohibition against the use of pure mist lubrication in high speed applications, but as with any change, an engineered review is certainly recommended.
RE: Pure oil Mist lubrication
In our lives we are always taking calculated/mitigated risks of many kinds and
Definitely a thorough decision making with Hazop,Hazan etc. on all types of risks/hazards is taken-up.
This is also an identical situation I believe.
Best Regards
Qalander(Chem)