How to Know Oil Specifications Acceptance Range?

There should be a maintenance schedule for each piece of equipment, in your literature. Change the oil at the recommended intervals, along with any other routine lubrication and checks.

As far as I know ONLY the equipment manufacturer who made the validation tests for the oil quality can give such limits.

In fact the recommended time to oil replacement is a measure of acceptable limits since quality loss is for a given machine proportional (in some respect) to working cycle and time.

ASE and and others like them will only rate a given product for its performance under specific tests. they will "pass" or "approve" it and give their stamp of approval. they will not however advise you on change intervals or anything maintenance related, you must consult the manufacturer of each given piece of equipment for that information.

Lubricant provider may also give you the limiting acceptable range for various parameters for lubricating oil and its replacement frequency.

thank you all for your feedback

we contact the manufactrer and ask him for the accepted range for the oil specifications

but the manufactrer didnt provide us. he only gave us the recommended time to change the oil ( example each 5000 runing hours ).

if i only stick on this rule(the recommeded time to change the oil), there will be no point of the rotine lube oil analysis.

i will give you easy example :

the manufactrer said the recommeded time to change the oil 5000 hr. after 2000hr the water content increase, or there was some process gas leak into the lube oil & the flash point drop, or there was too much wear on the machine which resluts on increasing of the solid & metals content.

is it wise to stick on the recommended time to change the oil? or you should have on your hand aceptence range (for flash point, water content, solid & metal content viscosity etc) and do oil analysis to check if you are on the safe side or you should have early action?

because of that im in situation i need to know how to Know Oil Specifications Acceptance Range?

i think there should be a standard or method or a fourmla which answer my question.

Typically, the oill change schedule is based on real life tests on the actual equipment, but if you are seeing problems before that time, here are some numbers and codes that may help. These are numbers for turbine oil, but should give you a general idea of when a change is needed.

http://www.machinerylubrication.com/Read/300/turbine-oil-performance

I'm surprised that the manufacturer did not state that the suggested oil change intervals were for "normal" conditions, and that shorter change intervals might be required under conditions such as those you describe.

Your operating conditions suggest that you should analyze your oil, and perhaps change it more frequently than suggested.

Start to build up YOUR data bank taking every 1000h a sample and making all pertinent analysis. This will correlate them to YOUR working conditions the manufacturer does not know exactly how YOU will use the machine.

This way you will have an indication about the trend and may be you will be able to change every 10.000 h in stead of 5000. This is the BEST approach if either the machine is very big and expensive or there are many machnies in use and conditions are far from "normal". It is expensive but it could pay back.