Ammonia basics

[Grizzly]

Thanks Grizzly, still an uncommon scenario to me even under those conditions.
We must be doing something different with our design, or sizing of oil separators.
We use vertical separators 99% of the time which are a lot better to work on no matter
what anyone says.
The only situation that comes to hand is a dual duty machine that predominantly works
on high side operation & has a separator sized for that duty.
If you run as booster, expect a bit of oil carry over due to increased flow rate.
Booster duty oil separator is approx 40% bigger.

We installed a system with 4 Howden WRV3212.2 screws on water chiller duty & each oil separator
has over 20 coalescers 9" diameter x 42" in each one, maybe that tells a story in itself, by keeping velocity down through filters (high spec job).

Maybe I'm dreaming?

Not dreaming. Just know what you are doing and allowed to show it!
The one I was referring to was sized for 1 megawatt of cooling 24/7 and 3.3 total.
Not for the end result which was a third of design a third of the time.

As you say sized and designed correctly there is no drama!
Sadly not always the case1
Grizzly