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Sizing Deck Drain System

Sizing Deck Drain System

Sizing Deck Drain System

(OP)
Can anybody give me some rules of thumb as far as proper sizing of a deck drain system?  I need to properly size the piping to a holding tank.

RE: Sizing Deck Drain System


Depends what you're trying to get rid of - rainwater? waves shipping into a cockpit? or washdown residue?

Also the size of vessel and the type of sea it may encounter (if it's ocean-going).

For small pleasure boats (up to 50ft WL), I have seen a recommendation for draining enclosed cockpits based on one 2 inch drain for each 20 sq ft. I'm not sure this is enough if you're going to ship green water over an enclosed deck space - you can take on 3 or 4 tonnes of water in a single wave.

Why are you containing it in a holding tank? If it's washdown residue then you obviously don't need as much. I would still stick to 2 inch drains with smooth hose and gentle bends to enable blockages tro be cleared.

John

RE: Sizing Deck Drain System

If you are considering drainage for offshore platforms, you should also consider draining the deluge water and spill.

RE: Sizing Deck Drain System

(OP)
Thanks for the thoughts.  We use a standard 4 inch drain for general deck areas and 6 inch drains for drains on the Rig Floor.  I found some tables showing standard GPM per size of drain headers.  The reason we are draining to a holding tank is to achieve a Zero Discharge classification which makes the unit more marketable in today’s environmentally sensitive world.  We drain all fluids to a holding tank and then run it through monitoring devices before going overboard with it.  Any contaminated fluid will be shipped to shore for disposal.

John

RE: Sizing Deck Drain System

with the total volume of waste, how did you now size the holding tank, assuming you will pump it out by level into the process ?

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