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DF-475-5
HEE
DF-475-5 8 DOG RAISED WATERTIGHT HATCH
MODEL NO. | A | B | C | D | WT.(lbs) |
| DF-475-5 | 30" | 35 3/8" | 37 3/8" | 5" | 220 |
| NO. | Name & Specifications | Qty | Material |
| 1 | COVER | 1 | STEEL |
| 2 | COAMING | 1 | STEEL |
| 3 | GASKET | 1 | NEOPRENE |
| 4 | DOG HANDLE | 8 | BRASS |
| 5 | TUMBLE BOLT | 8 | BRONZE |
Leakage test: Pressure 0.04MPa
Other optional extras include: hot dipped galvanized, stainless steel construction, and customing heights
The DF-475-5 8 Dog Raised Watertight Hatch sets a new standard for secure marine access with its enhanced latching system and rugged construction. As global maritime trade expands, the demand for reliable hatch covers capable of withstanding extreme conditions continues to grow, a market projected to reach $415.9 million by 2035 . This hatch addresses this need with eight precision-engineered latches that provide superior sealing performance compared to models with fewer dogs. The raised profile design offers a practical balance between watertight integrity and operational convenience, making it a versatile solution for various vessel types.
The eight adjustable compression dogs create multiple pressure points around the hatch perimeter, ensuring a uniform seal even on uneven surfaces . This redundant latching system provides fail-safe protection against water intrusion, with each dog independently adjustable to compensate for deck movement or warping over time. The cumulative sealing pressure exceeds industry standards for offshore applications.
Built with thick-gauge steel components and reinforced framing, the hatch withstands extreme operational stresses including heavy impacts and vibration. All metal surfaces receive corrosion-resistant treatment suitable for continuous saltwater exposure. The hinge assembly features stainless steel pins and bushings to maintain smooth operation through years of use in harsh marine environments.
Incorporating a friction hinge system, the hatch remains securely in any open position without additional stays or props . This feature prevents unexpected closure during maintenance operations, reducing injury risks. The handle design includes a locking mechanism that prevents accidental opening while allowing quick release in emergency situations.
This hatch is particularly well-suited for bulk carriers and heavy cargo vessels where equipment access must not compromise hull integrity . Its robust construction makes it ideal for offshore supply ships operating in rough seas and remote locations. Common installations include engine room access, storage compartments, and below-deck utility spaces on commercial fishing vessels. The enhanced sealing capability meets the stringent requirements of chemical transport ships where containment integrity is critical for environmental protection.
The eight-dog configuration provides approximately 33% more sealing points than six-dog designs, offering superior water resistance in applications with higher pressure differentials or larger deck openings. This makes it better suited for deep-draft vessels and offshore operations.
The hatch maintains functionality in temperatures ranging from -20°C to 60°C (-4°F to 140°F). The gasket material retains elasticity across this spectrum, ensuring consistent sealing performance in both Arctic and tropical environments.
Yes, options include specialized gasket materials for chemical resistance, custom finishes for enhanced corrosion protection, and modified handle configurations for restricted access areas. The frame can also be adapted for non-standard deck thicknesses.
The eight-dog mechanism should be inspected monthly and lubricated quarterly with marine-grade lubricant. Each dog's adjustment should be checked annually to ensure uniform pressure distribution across the sealing surface.
Designed to withstand hydrostatic pressure up to 5 psi, the hatch exceeds standard requirements for most commercial marine applications. This rating ensures performance integrity even when submerged under several feet of water during extreme conditions.
DF-475-5 8 DOG RAISED WATERTIGHT HATCH
MODEL NO. | A | B | C | D | WT.(lbs) |
| DF-475-5 | 30" | 35 3/8" | 37 3/8" | 5" | 220 |
| NO. | Name & Specifications | Qty | Material |
| 1 | COVER | 1 | STEEL |
| 2 | COAMING | 1 | STEEL |
| 3 | GASKET | 1 | NEOPRENE |
| 4 | DOG HANDLE | 8 | BRASS |
| 5 | TUMBLE BOLT | 8 | BRONZE |
Leakage test: Pressure 0.04MPa
Other optional extras include: hot dipped galvanized, stainless steel construction, and customing heights
The DF-475-5 8 Dog Raised Watertight Hatch sets a new standard for secure marine access with its enhanced latching system and rugged construction. As global maritime trade expands, the demand for reliable hatch covers capable of withstanding extreme conditions continues to grow, a market projected to reach $415.9 million by 2035 . This hatch addresses this need with eight precision-engineered latches that provide superior sealing performance compared to models with fewer dogs. The raised profile design offers a practical balance between watertight integrity and operational convenience, making it a versatile solution for various vessel types.
The eight adjustable compression dogs create multiple pressure points around the hatch perimeter, ensuring a uniform seal even on uneven surfaces . This redundant latching system provides fail-safe protection against water intrusion, with each dog independently adjustable to compensate for deck movement or warping over time. The cumulative sealing pressure exceeds industry standards for offshore applications.
Built with thick-gauge steel components and reinforced framing, the hatch withstands extreme operational stresses including heavy impacts and vibration. All metal surfaces receive corrosion-resistant treatment suitable for continuous saltwater exposure. The hinge assembly features stainless steel pins and bushings to maintain smooth operation through years of use in harsh marine environments.
Incorporating a friction hinge system, the hatch remains securely in any open position without additional stays or props . This feature prevents unexpected closure during maintenance operations, reducing injury risks. The handle design includes a locking mechanism that prevents accidental opening while allowing quick release in emergency situations.
This hatch is particularly well-suited for bulk carriers and heavy cargo vessels where equipment access must not compromise hull integrity . Its robust construction makes it ideal for offshore supply ships operating in rough seas and remote locations. Common installations include engine room access, storage compartments, and below-deck utility spaces on commercial fishing vessels. The enhanced sealing capability meets the stringent requirements of chemical transport ships where containment integrity is critical for environmental protection.
The eight-dog configuration provides approximately 33% more sealing points than six-dog designs, offering superior water resistance in applications with higher pressure differentials or larger deck openings. This makes it better suited for deep-draft vessels and offshore operations.
The hatch maintains functionality in temperatures ranging from -20°C to 60°C (-4°F to 140°F). The gasket material retains elasticity across this spectrum, ensuring consistent sealing performance in both Arctic and tropical environments.
Yes, options include specialized gasket materials for chemical resistance, custom finishes for enhanced corrosion protection, and modified handle configurations for restricted access areas. The frame can also be adapted for non-standard deck thicknesses.
The eight-dog mechanism should be inspected monthly and lubricated quarterly with marine-grade lubricant. Each dog's adjustment should be checked annually to ensure uniform pressure distribution across the sealing surface.
Designed to withstand hydrostatic pressure up to 5 psi, the hatch exceeds standard requirements for most commercial marine applications. This rating ensures performance integrity even when submerged under several feet of water during extreme conditions.
