Marine Tanks
Custom-welded marine tanks in HDPE and Seaboard marine-grade plastic for boats and vessels. Baffled, fitted, and shaped to your hull cavity.
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Partner with Australia's leading acrylic fabrication experts. We provide end-to-end support from material selection to final delivery.
Material Consultation
Our engineers help you select the optimal grade for your specific environmental and aesthetic requirements.
CAD Support
Send us your designs in DXF, DWG, or PDF. We review every file for structural integrity and precision cutting paths.
Fast Quoting
Receive a comprehensive technical specification and competitive quote within 24 hours of your submission.
Recommended Materials
Selecting the right base material for this application.
Custom Marine Tanks for Boats and Vessels
Fitting a tank into a boat almost always means working around an irregular hull shape, structural stringers, and very little wasted space, which is exactly why welded plastic tanks are so widely used in marine fitouts. Rather than forcing a round or rectangular tank into a curved hull cavity, a custom-fabricated tank can be shaped to follow the hull profile and maximise usable capacity.
Marine tanks also need to handle constant vibration, saltwater exposure, and the movement of a vessel underway, all of which a properly welded and baffled plastic tank is well suited to.
Why HDPE and Seaboard Suit Marine Applications
HDPE sheet is the standard material for fresh water, grey water, and holding tanks on boats, being lightweight, corrosion-proof, and unaffected by prolonged contact with fresh or salt water. Seaboard HDPE marine-grade plastic takes this further with additional UV stabilisation, making it the preferred choice for tanks or tank components exposed to direct sun on deck or in an open engine bay.
Polypropylene is sometimes specified for fuel-adjacent components or tanks where its particular chemical resistance profile is a better match than standard HDPE.
Fuel, Water, and Holding Tanks Built to Fit
Fuel tanks require careful attention to fitting compatibility, vent design, and compliance with marine fuel system standards, and we work closely with boat builders and marine fitters to get this right for each vessel. Fresh water and holding tanks have more flexibility in shape and fitting placement, allowing tighter integration into the available hull space.
All marine tanks we build include internal baffling as standard, since an unbaffled tank creates dangerous surge forces as a vessel pitches and rolls, affecting both handling and structural loads on the tank and its mounts.
Fittings and Baffling for Tanks at Sea
Fittings such as deck-fill inlets, vent lines, level senders, and pump outlets are welded in during fabrication, positioned to match your existing plumbing runs and deck hardware.
Send us your hull cavity dimensions or existing tank template, along with the liquid type and required volume, and we will fabricate a tank to fit, baffled and fitted ready for installation.
Featured Products
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Services Involved
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Need help with your marine tanks project?
Our engineers provide expert guidance on material selection, design optimisation, and fabrication.
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