check air in oil

[Sandra_ME30]

technomodel 21.12.15 16:41

Good morning, everyone.
I would like to point out that I am relatively new in teodynamics, so I could ask for trivialities or say obvious.

In the company where I work we have a test bench for the pumps we build.
a problem has long been occurring during the pump test phase.
in practice we wear 2 components.
the disconcerting thing is that there is no repeatability in this problem, sometimes it shows up and others does not.

we have analyzed the components several times and we have never encountered problems.
As wear occurs in the passage zone between suction pressure and pressure pressure I am beginning to think that a cause could be the presence of air particles in the oil that when arriving in the pressure zone implore creating a simil cavitation.

Is my idea plausible?
How could I check this out? Is there any way to analyze the oil to verify the thing?

 

[Sandra_ME30]

Mechanical 23:46

You can see that the pump is running out and cavity. but you only know how the plant is done and closed does, filtration etc....or are we talking about a company with no specialized person despite building pumps?
what are these two components that spoil? If you don't take pictures or patterns, I see it hard to understand your problem.
pressure? Are you going? What oil?

 

[Sandra_ME30]

pirurg 22.12.15 07:06

hi technomodel,

if there is air in the oil you should see it already visually as the oil becomes a sort of emulsion.
It's quite visible.

 

[Sandra_ME30]

technomodel 22.12.15 08:05

thanks to both of you for the interest.
pump components are intact, we have checked them several times.
Moreover the same pump sometimes presents the problem and others not, this confirms the integrity of the pieces.

wear is on a static ring and palette. sometimes on both, sometimes only on the palettes and others only on the ring.
the only constant is that the ring deteriorates in the crossover area.

visually you do not notice emulsion, I wondered if they could be small bubbles difficult to see.
or if there is moisture in the oil?

I go a little bit to tentons but I don't know what to do anymore, all that hypothesized until now has not had recontrials.

Unfortunately the technical knowledge in the company came less with the exit of my predecessors, I am looking to deepen the matter but inside lacks support.

In any case, even those who preceded me had to deal with this problem and did not come to terms with it.

 

[Sandra_ME30]

technomodel 22.12.15 09:07

I attach some images of worn parts.

 

[Sandra_ME30]

Mechanical 12:38

It is a very aggressive erosion perhaps even unfiltered microparticles mechanics.

 

[Sandra_ME30]

technomodel 22.12.15 13:59

originally written by Mechanical view message
It is a very aggressive erosion perhaps even unfiltered microparticles mechanics.

we had thought, but there are some points that leave doubts.
happens to commercials, sometimes you wear both other components only one.make various checks and we can exclude that the components are different somehow.

they wear only in a restricted area of the ring, at the crossover. If there were particles, I'd think that the whole ring would be used.

only those 2 components are worn, others always in contact with the same oil do not have wear.

the oil has been analyzed recently and is done every year, no particles have been reported.

If you want to go further, I have a way to check this without analyzing the oil?