3/24/08
Bilge
Every Naval engineers favorite place to spend an afternoon while under way. First coined in 1523, the bilge referred to the lowest compartment on a ship where the two sides meet at the bottom. The term bilge itself is sometimes used to describe the water that collects in this compartment. Water that does not drain off the side of the deck drains down through the ship into the bilge. This water may be from rough seas, or rain or both. The water that collects in the bilge must be pumped out if it becomes too full and threatens to sink the ship. This water is pumped out of the vessel at a later time.
Bilge water can be found aboard every vessel, but its composition is always unique. Because the bilge wells receive fluids from many parts of the ship, bilge water can contain water, oil, urine, detergents, solvents, sweat, blood, chemicals, pitch, saliva, particles, and so forth.
By housing water in a compartment, it keeps it beneath the decks, making it safer for the crew to operate the vessel and for people to move around in strong weather.
The development of bilge pumps went from buckets, to hand pumps, and now electric bilge pumps are available for even small vessels. Bilge coatings are applied to protect the surfaces. The water is often noxious, and "bilge water" is a derogatory term often used colloquially to refer to something bad, ruined, or fouled.
A feature of the bilge is the swash plate, which serves to dampen the rush of water from side to side, which might destabilize the ship if allowed to run at will. The swash plates run fore and aft and have small openings near the bottom where the water is allowed to run through.
Some ships are known for have nasty wet stinky bilges, while other ships have what are called dry bilges. My ship had a dry bilge, but it never really was dry. There was always some mixture of water, fuel, lube oil, tobacco spit, urine, and who knows what else swashing around down there. If you were told to clean the bilge, you had just come as close to getting sent to Captain’s mast as you could get. Or you were a smart mouth Marine want to be Midshipmen who needed to learn your place.
While my ships was in a short overhaul period we actually did clean the bilge. It was dry and needed to have the layer of dry crud removed before we got back under way. So myself and the two other new guys were told to break out the swabs and get it clean. We actually mopped the bilge and even used rags to clean it. It looked really nice when we were done. But once we started to hit the open ocean again it was trashed.
So, if you have a nasty part of your plant that needs to be cleaned or a person makes just rotten coffee, use this term for that. “Dave made his bilge water coffee today.” or “since you just cannot seem to listen, go to the air compressor room and clean the bilge.”