Lifeboat Drencher

A similar system was fitted around the lifeboats.
Their primary function here is to protect the crew from any fire during boarding of the lifeboat and abandonment, this system also covered the liferafts.
As can be seen, it certainly discharged a fair amount of water and you got a real soaking, however getting a bit wet is infinitely preferable to burning.
The drenching system had it's own dedicated pump in the E/R, with one of the General Service pumps as backup.