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The DF-144 5 Single Dog Ullage Hatch fulfills a specialized role in marine operations, providing precise access for liquid level measurement and tank inspection.
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DF-144-5
DF-144-5 SINGLE DOG ULLAGE HATCH
MODEL NO. | ΦA | B | ΦC | WT.(lbs) |
| DF-144-5 | 8 1/16" | 7/8" | 9 1/2" | 38 |
| NO. | Name & Specifications | Qty | Material |
| 1 | COVER | 1 | CAST STEEL |
| 2 | COAMING | 1 | STEEL |
| 3 | GASKET | 1 | NEOPRENE |
| 4 | ARM | 1 | CAST STEEL |
| 5 | TUMBLE BOLT | 1 | STAINLESS |
| 6 | DOG HANDLE | 1 | CAST IRON |
Leakage test: Pressure 0.04MPa
Other optional extras include: hot dipped galvanized, stainless steel construction, and customing heights
Unlike general-purpose hatches, this design prioritizes controlled access to storage tanks, cargo holds, and fluid reservoirs on various vessels. Its compact single-dog latching system offers quick, tool-free operation while maintaining the necessary seal integrity for liquid containment areas. As maritime regulations emphasize accurate cargo measurement and safety protocols, this ullage hatch has become an essential component in tanker operations and bulk liquid transport.
Optimized for liquid level measurement, the hatch features a compact footprint that minimizes tank exposure while providing sufficient access for measurement instruments and inspection equipment . The opening size is engineered to accommodate standard ullage tapes, sampling devices, and sensor probes used in cargo verification procedures.
The single ergonomic dog latch allows one-handed operation, enabling quick access during routine measurement checks . Despite its simplified operation, the latching system creates adequate compression to maintain a liquid-tight seal when closed, preventing vapor escape and contamination. The handle incorporates a visual indicator showing locked/unlocked status.
Constructed with materials compatible with various cargo types including petroleum products, chemicals, and potable water. The sealing gasket is available in specialized compounds to resist chemical degradation when used with aggressive substances. All wetted components use non-reactive materials to prevent cargo contamination or product degradation .
Primarily utilized in tanker vessels and chemical carriers, this ullage hatch provides access to liquid storage tanks for level measurement, sampling, and inspection . It is commonly installed on fuel storage compartments of commercial ships and offshore platforms. The design is also found on beverage transport vessels and water tanks where maintaining product purity is essential. Naval vessels employ these hatches for monitoring fuel and water reserves while maintaining secure containment.
An ullage hatch is specifically designed for accessing liquid storage tanks to measure the empty space ("ullage") at the top of the tank, critical for determining cargo volumes. Unlike general access hatches, it features a smaller opening optimized for measurement instruments rather than personnel access.
Yes, when specified with appropriate gasket materials and construction options, the DF-144 5 meets regulatory requirements for hazardous material containment. It can be configured to handle flammable, corrosive, and toxic substances commonly transported in marine vessels.
The precision-engineered dog applies concentrated pressure at the optimal point on the sealing gasket. While fewer than multi-dog designs, the single dog's placement and leverage create sufficient compression for liquid-tight performance in non-pressurized tank applications.
The sealing surface should be inspected regularly for debris that could compromise the seal. The gasket should be replaced annually or whenever signs of wear appear. The measurement opening should be kept clean to ensure accurate readings and prevent contamination.
Yes, the opening can be adapted to accommodate permanent sensor installations while maintaining the hatch's original functionality. Optional fittings allow integration with automated ullage measurement systems for remote monitoring of tank levels.
DF-144-5 SINGLE DOG ULLAGE HATCH
MODEL NO. | ΦA | B | ΦC | WT.(lbs) |
| DF-144-5 | 8 1/16" | 7/8" | 9 1/2" | 38 |
| NO. | Name & Specifications | Qty | Material |
| 1 | COVER | 1 | CAST STEEL |
| 2 | COAMING | 1 | STEEL |
| 3 | GASKET | 1 | NEOPRENE |
| 4 | ARM | 1 | CAST STEEL |
| 5 | TUMBLE BOLT | 1 | STAINLESS |
| 6 | DOG HANDLE | 1 | CAST IRON |
Leakage test: Pressure 0.04MPa
Other optional extras include: hot dipped galvanized, stainless steel construction, and customing heights
Unlike general-purpose hatches, this design prioritizes controlled access to storage tanks, cargo holds, and fluid reservoirs on various vessels. Its compact single-dog latching system offers quick, tool-free operation while maintaining the necessary seal integrity for liquid containment areas. As maritime regulations emphasize accurate cargo measurement and safety protocols, this ullage hatch has become an essential component in tanker operations and bulk liquid transport.
Optimized for liquid level measurement, the hatch features a compact footprint that minimizes tank exposure while providing sufficient access for measurement instruments and inspection equipment . The opening size is engineered to accommodate standard ullage tapes, sampling devices, and sensor probes used in cargo verification procedures.
The single ergonomic dog latch allows one-handed operation, enabling quick access during routine measurement checks . Despite its simplified operation, the latching system creates adequate compression to maintain a liquid-tight seal when closed, preventing vapor escape and contamination. The handle incorporates a visual indicator showing locked/unlocked status.
Constructed with materials compatible with various cargo types including petroleum products, chemicals, and potable water. The sealing gasket is available in specialized compounds to resist chemical degradation when used with aggressive substances. All wetted components use non-reactive materials to prevent cargo contamination or product degradation .
Primarily utilized in tanker vessels and chemical carriers, this ullage hatch provides access to liquid storage tanks for level measurement, sampling, and inspection . It is commonly installed on fuel storage compartments of commercial ships and offshore platforms. The design is also found on beverage transport vessels and water tanks where maintaining product purity is essential. Naval vessels employ these hatches for monitoring fuel and water reserves while maintaining secure containment.
An ullage hatch is specifically designed for accessing liquid storage tanks to measure the empty space ("ullage") at the top of the tank, critical for determining cargo volumes. Unlike general access hatches, it features a smaller opening optimized for measurement instruments rather than personnel access.
Yes, when specified with appropriate gasket materials and construction options, the DF-144 5 meets regulatory requirements for hazardous material containment. It can be configured to handle flammable, corrosive, and toxic substances commonly transported in marine vessels.
The precision-engineered dog applies concentrated pressure at the optimal point on the sealing gasket. While fewer than multi-dog designs, the single dog's placement and leverage create sufficient compression for liquid-tight performance in non-pressurized tank applications.
The sealing surface should be inspected regularly for debris that could compromise the seal. The gasket should be replaced annually or whenever signs of wear appear. The measurement opening should be kept clean to ensure accurate readings and prevent contamination.
Yes, the opening can be adapted to accommodate permanent sensor installations while maintaining the hatch's original functionality. Optional fittings allow integration with automated ullage measurement systems for remote monitoring of tank levels.
