Freeman Marine 2400 Series – Cast Flush Deck Hatches

Welcome to Bövik Marin AB – authorized distributor of Freeman Marine (AdvanTec Marine). The 2400 Series cast aluminum hatches represent the global commercial standard for quick-acting, flush deck access across workboats, patrol craft, fishing vessels, and offshore tenders.

Featuring Freeman's patented dogging mechanism, the hatch secures or dog-unlocks in less than a quarter-turn using an integrated, flush-pocketed stainless steel T-handle. Cast from rugged, corrosion-resistant Almag-35 marine aluminum, they are available in round, oval, square, and rectangular formats — configured as either lift-out covers or hinged units.

The 2400 Series is engineered around two distinct sealing methodologies. Please select the category below matching your deck configuration and operating requirements:

1. Compression Seal Hatches » Smooth, raised spigot design without collection gutters. Clean deck wash-down, easy debris clearing, and extended gasket lifespan. Preferred for: Workboats, fishing vessels, passenger ferries, and working decks.

2. Knife-Edge Seal Hatches » Coaming featuring an aggressive knife-edge rim and perimeter drain gutter where a spigot can be installed. Extreme contact pressure under heavy green-water seas. Preferred for: Coast guard, SAR craft, military patrol vessels, and exposed foredecks.

Compression or Knife-Edge – Specifying the Right Seal for Your Hull

Selecting between compression and knife-edge sealing depends on deck operations, deck location, and water drainage capabilities. Because the covers and deck rings are structurally incompatible between the two formats, specifying the correct geometry is essential:

1. Compression Seal (Smooth Spigot & Easy Washdown)

Operational Concept: The deck ring features a smooth raised spigot that presses flat against the gasket face. The coaming has no outer drainage trough.
Vessel Benefits: No narrow crevices to trap debris, fish scales, sand, or winter ice. Decks wash clean effortlessly. The gasket experiences uniform compression across a wide contact area, offering exceptional service longevity.
Typical Vessels: Commercial fishing boats, cargo pontoons, aluminum workboats, and coastal cruisers where simple deck maintenance is paramount.

2. Knife-Edge Seal (Integrated Gutter & Extreme Green-Water Defense)

Operational Concept: The deck coaming incorporates a machined knife-edge rim flanked by an integrated water drainage gutter with a drainage fitting. Closing the cover embeds the rim into a hollow neoprene gasket.
Vessel Benefits: Delivers immense concentrated sealing force. Seawater washing across the deck is captured in the gutter and directed overboard, preventing water from cascading into machinery spaces when opened during heavy weather.
Typical Vessels: Coast Guard cutters, lifeboat rescue vessels, military patrol boats, and offshore tugs facing severe bow overspill.

Technical Overview: 2400 Series Sealing Methodologies

Technical Parameter	Compression Seal	Knife-Edge Seal
Deck Ring Profile	Smooth raised sealing spigot; no perimeter gutter	Machined knife-edge rim with integrated drain gutter
Drainage Requirements	No drain plumbing required in the coaming	Requires drain hose connected to coaming spigot
Gasket Placement	Gasket recessed into cover plate underside	Hollow D-profile gasket recessed in cover channel
Deck Maintenance	Effortless washdown; resistant to cargo debris	Gutter requires regular clearing of grit and dirt
Watertight Integrity	30 ft intermittent / 10 ft continuous head pressure	Maximum resistance against heavy green-water surges
Coaming Mounting Options	Weld-in (aluminum/steel) or bolt-in coaming (alu)	Weld-in (aluminum/steel) or bolt-in coaming (alu)

Need Cutout Specifications, CAD Drawings, or Commercial Quotations?

Bövik Marin AB provides naval architects, shipbuilders, and operators with technical drawings, installation templates, and class documentation. Contact us for commercial pricing or refit assistance.
Email: info@bovikmarin.se | Phone: +46 (0)31 29 00 75