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There may be a concern the storage oil may have been contaminated based on storage environment and time. Often we don't watch these things as closely during storage and transport as during operation. Also the may not be routine mixing (by running) and sampling of the oil during storage as during operation.

This may not be conclusive but it introduces a risk/concern. For many situations the tiny amount of effort/expense to change oil is well worth reducing the risk.

Also in some cases, the equipment may not be suitable to move with oil in it. In that case you've got to drain it for transport from warehouse to plant anyway.

RM

[quote]What are technical reasons for contamination of oil during pump storage at site?[/quote]Moisture is the most common contaminant.  It can come from condensation during temperature cycles. Corrosion products may be a consideration (if environment and reservoir coatings are less than ideal).    Rodents or insects may find their way inside during storage, too.

[QUOTE]can you elaborate on this '' the may not be routine mixing (by running) and sampling of the oil during storage.'' How it affects the property of oil?[/QUOTE]

The lack of sampling affects our ability to know whether something has contaminated the oil.   Most large machines should be rotated during  long-term storage, but that does not create much mixing.  Without mixing there is a possibility of stratification, particularly water and debris onto the bottom which won't mix into the oil until you start the machine (assuming you never changed the oil).

RM

This post may be a little late in the game.  I believe most corrosion/liquid phase inhibitors are a 32 Vg.  Typically this is 10% addition or less, it would seem just the viscosity alone would justify an oil change prior to commissioning a unit due to trending oil analysis.  If proper storage is utilized, wouldn't you have to drain the unit to prep for installation - Bullseye, BS&W etc...Most centrifugal rotating ass'y are 1-3 qts +/-, why not start with a clean product. We currently drain, purge and replenish with the appropriate lube oil prior to commissioning. 

RM

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