Hi
Dear sir
I want to know, is there any standard for overhaul period of each type of equipment eg.umps? and how we can extend vendor recomended time for overhaul of one equipment after operation?for example vendor recomends yearly overhaul for one MOV, is it logical? is it cost effective?
I hope to here you soon
Regards

You got to prepare your overhaul strategy with inputs from others or experience. The recipe cannot be prescribed exactly.

Is the question do I pull it out on time or on condition?
To make good economic sence you need to look at each thing indavidually.
For example: If a new motor and pump setup costs say $10,000 each time and you have 50 of these then I would be looking to do vibration analysis and check the flow rates etc to determine the condition before I touched them.
If you had 10 pumps @ $2000 each then it would possibly be better to change out on time base.

NB: The above examples do not take into account the lost production if one of these pumps were to fail.

If a vendor has recommended a yearly overhaul to you on thier equipment then I would be asking as to why?
You may need to have a look at the design.
Get them (Vendor/supplier) to show you the difference between say the impellor that is 1 year old verses a new one, then you can calculate the efficiency of your plant with the new versus the old etc.

I hope this helps,

Hooch

Hi,
The question should be whether you should overhaul at all, and if so, on what basis.
1. Can you afford a failure? What are the consequences?
2. How often is it likely to fail? This depends on many factors, some known to the vendor, but most importantly, only you know how you operate it, internal and external environment, loading etc.
3. Some elements e.g. ball bearings fail randomly (in time), so PdM is probably the best strategy. Others, such as impellers, wear rings, neck bushes wear out. Often operating performance data can tell us when they need attention. But if the consequence of failure is high, a running-hour or time based overhaul is justified.

Hooch, I suggest that the Capital cost or the number of Units is not the best guide, though it is a factor in evaluating consequences.