Marine and dockside fuel and water containers

The dockside is a corrosive place. Chloride in sea air and spray attacks metals that shrug it off inland, so the marine environment changes which container survives.

What salt does

Chloride pits and corrodes ordinary steel and, over time, even standard stainless. A galvanized steel fuel can lasts far longer in salt air than bare steel, but the harshest marine duty asks for more. Spray reaches into cockpit lockers and lazarettes, and the salt film it leaves keeps working long after the water dries.

Stainless grade matters here

For water and food-grade liquids in a marine setting, AISI 316 stainless resists chlorides better than 304, thanks to its molybdenum. That molybdenum raises the PREN, the pitting resistance equivalent number that predicts how a stainless holds up against chloride attack, and 316 carries a higher PREN than 304. Chloride works into crevices and seams first, so a clean weld and a smooth interior earn their keep alongside the grade. Where 304 suits inland potable water, 316 is the marine upgrade. Read stainless 304 vs 316.

Fuel at the pontoon

For carrying and pouring fuel at a small fuelling point, a galvanized or coated steel can handles the hydrocarbons and the exposure, kept dry between uses to protect the coating. Fuel vapour builds inside a sealed can left in the sun, so vent it away from the water before you crack the cap. Confirm the fuel and any marina rule before you carry.

The one-third fuel rule

Boaters plan range by thirds: a third of the fuel to reach the destination, a third to return, a third held back for weather or a longer way home. Carried cans back that reserve, so size and count what you bring to the rule, not to the tank alone.

Shape for lockers and small craft

An upright can wastes the space a boat gives you. A low-profile horizontal can lies flat in a cockpit locker or under a thwart, stows below the rail out of the worst spray, and shifts less than a tall can on a heeling deck. See horizontal and under-seat cans.

Handling and safety

Secure cans against a moving deck, keep them sealed against spray, and follow the marina's fuel-handling and spill rules. Straps or a dedicated holder grip a can better than a wedged corner, and a loose can turns into a projectile when the boat rolls. See holders and accessories. Keep fuel and water cans apart and colour-code them, so nobody tips petrol into a drinking-water can in a hurry. A pouring spout cuts spillage into a filler on an unsteady platform. See spill containment. Back on the mooring, rinse the salt off the metal with fresh water before a drying film starts to pit it.

A common mistake

The error that costs a season is a painted or plain-steel can left in salt air: the coating chips, spray finds the bare steel, and rust follows fast. The other is fitting 304 where the duty called for 316, then watching chloride pit a metal that looked right on paper. Match the metal to the liquid and the exposure before you buy, not after.

What Fortitude21 fits

Our stainless water range is AISI 304 as standard, with 316 on request for marine duty, and our steel fuel range suits dockside carrying. Tell us the water or fuel and the exposure and we specify the grade. See the water and fuel ranges.

Match the can to the job

Salt and shape both point at a can. Here is what we would put on the pontoon.