Dear Hector,
Foam with new oil is a common occurrence, it is due to moisture and air in the oil (or new pump) out gassing.  This is also common if you are pumping a lot of water.  In the short term it isn't a problem but over time water vapour can effect the veins in some pumps (especially the older Edwards models)  Run your pump on ballast for a while (till it clears) and it will remain clear.
Cheers,
Carolyn Chenery

-----Original Message-----
From: Stable Isotope Geochemistry [mailto:[log in to unmask]]On
Behalf Of Hector Panarello
Sent: 07 February 2007 16:55
To: [log in to unmask]
Subject: [ISOGEOCHEM] Foam in rotary pump oil


 

Dear all


I have changed 3 rotary pumps in my MS by 3 brand new Edwards RV5 filled
with Edwards Ultra grade 19 pump oil.  Although the vacuum is fine, the oil
presents bubbles, giving it a "foammy aspect".  These bubbles disappear when
the pump is turned off. Does anybody know if this is a normal behaviour, or
if something is wrong?
Operating the gass ballast produced no changes.

Thank you in advance,

Héctor O. Panarello
Director
INSTITUTO DE GEOCRONOLOGÍA Y GEOLOGÍA ISOTÓPICA (INGEIS) Pabellón INGEIS -
Ciudad Universitaria
1428 Ciudad de Buenos Aires
Tel: +54-11-4784 7798
Fax  +54-11-47833024




   


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