Hello Experts Guy's

I'm scheduler and controler lubrication program in CMMS, I've to talk with engineer about appropriate time to change oil (not interval)

For example Pump A running 3 months then switching to Pump B and B running 3 month then switching to A, running cycle is 3 months. Question is When appropriate time to change oil for pump after switching? (After stop or before run)

Thank you

You shouldn't run equal times! Run Pump A 40% and Pump B 60% changing more frequently; maybe run one ~4 weeks and the other ~3 weeks so failure times should never coincide.

You're running both motor and pump with sleeve oil lube bearings - both bath? And the enviornment is? All factors. With an adequate filtering system and hour meters, change oil every three months or 2016 hrs.

Are there other factors? special additives? Recommendations from the oil OEM lubrication engineers --- see their publications.

Do you use onsite test kits and lab analysis for monitoring conditions of oil?

Josh,

Some machine we have take sampling lub oil analysis eg Compressor, and another eg pump we have change oil interval 1 year based on manufacturer and experience....my point are when the due date is come appropriate time to change it, because machine running 2 cycle/1 year (1 cycle = 3 months) between A and B.

Best time to change oil is while it is hot - straight after run if possible.

You beat me to it mike66. All the above doesn't answer the original question! Yes, drain the oil when it's HOT so that it flows faster and has a better chance of carrying any contaminants with it.

May only be a bath, but: drain, clean w/???nnn and then flush with flushing oil and replenish. Generally there's an OEM published procedure for solvents and flushing oils.

It's always a good idea to track oil and and oil out. If you bought 10000 gals, did you recover 10000 gals? Should be a part of a good maintenance program.

I would go for 1 year, if it is the OEM recommendation, these guys are very conservative and would not shoot themselves in the foot

One month more or less would not make that much difference

Probably if you have no ingression of contaminants or overheating (oxidation), the oil would last 2 years, but this all depends on your operating conditions

The other thing is if its hard to get to - we have some critical gearboxes I changed to synthetic that don't get very warm and well sealed. I have been running them on the same oil now for 6+ years without a change.
I do a 3 monthly oil sample on them to ensure oil and boxes in good nick. No problems so far.

"Condition based oil changes".

Mike.

Are there other factors? Warrantees? Does your insurance carrier have an input?

I have an old car. It leaves a stain on my driveway. I add a quart of oil every 2 months and I can always read the writing on the bottom of the dip stick

Whatever "min" means...

I change my oil every 50,000 miles if it need it or not!

I totally agree with Mike66, an important point to remember is that you still want the machinery to be available as soon as possible in case unit B fails. If there is a task to be done do it at the first available opportunity and make the backup available as soon as possible, this way you won't get caught out.

on equipment with oil capacity of 1000 liters and more oil analysis will be carried out. On secondary equipment on yearly base, on critical and vital equipment on 6 month base. Also for running of the equipment according to 1/3 to 2/3 is the best.

What ever the conditions, the 5 R'sof lubrication must prevail. Ideally a proper choice of oil analysis will indicate the condition of the lubricant and the equipment. After attaining the proper cleanliness target, monitor the lubricant condition and set the conditions at which you expect to retire the lubricant charge (i.e. when it does'nt fulfil the 5R's). Try to "err" on the "safe side". Remember, when the lubrication needs have been made, the engineering will be allowed to reach its goals and you can expect every penny's worth of performance from that expensive equipment.