8" Ullage Hatch with 7/8" Coaming Height (Model #DB144-08A) - Painted Steel

The Model DB144-08A is engineered to serve as a secure, secondary inspection and access port on tank tops or primary hatch covers. With an ultra-low 7/8" coaming height, it maintains a highly stream-lined profile to keep the active work deck safe from heavy tripping hazards. The quick-access latching mechanism allows crew members to rapidly open the hatch for direct measurement or venting operations and seal it back down to full integrity with minimal effort.

Intended Use Cases:

• Sounding & Ullage Readings: Ideal for quick-access monitoring of liquid cargo levels, fuel oil storage, or ballast levels using standard sounding tapes.
• Tank Sampling & Inspection: Allows swift personnel entry for fluid sampling or drop-light inspections of inner tank conditions without removing primary, heavy-duty manhole covers.
• Emergency Venting Ports: Serves as a manual venting access point during tank loading, discharging, or cleaning operations.

Primary Industries & Vessel Types:

• Inland & Coastal Barges: Heavily utilized on the deck flats or primary hatches of liquid cargo barges, tank vessels, and bunkering lines.
• Commercial Workboats & Tugboats: Standard equipment for fuel oil tank tops and dry void monitoring points on active fleet transport hulls.
• Offshore Support Vessels (OSVs): Perfect for auxiliary tank access where rapid, repeated checks are required by the deck crew.

• Low-Profile 7/8" Coaming: Minimizes deck protrusion to protect active foot traffic, moving gear, and vehicle wheels from severe obstruction.
• 8" Clear Opening Layout: Sized at a precise 8" diameter to comfortably accommodate standard inspection tools, sounding lines, and sampling canisters.
• Heavy-Duty Structural Steel: Fabricated from thick, high-tensile structural steel to prevent cover deformation and survive severe impact on commercial work decks.
• Buna-N Chemical-Resistant Gasket: Features a premium Buna-N (Nitrile) rubber gasket track providing excellent sealing performance and broad resistance to fuels, oils, and marine chemicals.
• Universal Shipyard Finish: Arrives shot-blasted and coated with a universal shipyard primer (painted), making the assembly completely ready for immediate welding and final coating at the shipyard.

• Qualified Personnel Requirement: Installation of the 8" ullage hatch must be performed by qualified marine welders or fitters in accordance with applicable classification society standards (ABS, DNV, Lloyd's).
• Surface Preparation & Alignment: The 7/8" low-profile coaming frame must be aligned true over a clean deck cutout and securely welded to prevent thermal warping or twisting of the perimeter sealing seat during fabrication.
• Latching Alignment & Check: Following structural welding, verify that the locking mechanism articulates smoothly and that the cover seats evenly across the entire frame.
• Debris Inspection: Prior to closing, ensure that the gasket track, coaming rim, and latch catches are completely free of weld spatter, slag, rust, or heavy topcoat accumulation.