L.O in L.O out, S.W in, what are these abbreviations? (Ammonia pump) 1

[MechatroPro]

I'm working on a project which involves a high pressure ammonia pump, there are some abbreviations on the drawing that I haven't seen before, what do L.O and SW stand for?
here's the Drawing of the pump I'm talking about.
Thanks in advance.

 

[pennpiper]

L.O. In = Lube Oil inlet
L.O. Out = Lube Oil outlet
S.W. In = Seal Water inlet
S.W. Out = Seal Water Outlet
(I assume this pump is in a Water service of some kind, maybe Boiler Feed Water?)

prognosis: Lead or Lag

 

[rotw]

L.O. : lube oil ?
S.W. : sealing water ?