Cyclic,
To meet the STANAG for HIFR you (used to in my days etc..) need to be able to deliver 50 gallons a minute at 50 PSI, 50 feet above the flight deck.
It certainly would fill up a Seaking at a reasonable rate and was ahndy capability for something like a Leander or T42 nearer the ASW action than Mum.
N