Phosphorus in oil?

[brazer]

Can anyone shed light on why a lab analysis would go from 10 mg/kg to 200 mg/kg in the space of a year?
Have asked the lab who did the analysis but they say they wouldn't know?????????

Thanks in advance

B

[NoNickName]

Phosphorous is contained in white metal journals (bearings). Probably there is an ongoing wearing of one or more crank journals.

[brazer]

NoNickName
Oil sample is from an Hitachi screw so dont think it has journal type bearings.
B

[NoNickName]

Ok, but don't take that as a mistake of the lab. It may well be an ongoing wear and tear.

[desA]

Copper-Phos (Harris 0) brazing rods?

Anyone had to braze into the system during the year?

[NoNickName]

Yes, phosphorus is also contained in welding sticks.

[RANGER1]

brazer,
Take another oil sample to prove its consistant.

The name brazer with this problem you describe is a story in itself!

[Quality]

Yes, phosphorus is also contained in welding sticks.

They are brazing rods

[Magoo]

Screw compressors do have white metal mains / bearing.
If they are starting wear, there is a major problem developing, as well as more oil sample testing get a vibration analysis done as well.

[Gingerair]

I think some Hitachi screws may use roller instead of plain bearings.
Also think phosphorus can be used in some metal treatments,(bearings).
Hitachi may be able to confirm the source of phosphorus.
As Ranger & Magoo said, re-test to confirm result..
Ginge

[Magoo]

I am not familiar with Hitachi screws, but generally a screw will have white metal mains and double ball based thrusts to allow for temp changes, oil pumps etc.. also could have phos/ bronze bearings.
What ever the change in oil sample results is alarming, labs are known to screw up as well, so repeat oil sample checks needed.