18" Multi-Bolt Raised Manhole (Model #SS154-18R-A) - Stainless Steel

The Model SS154-18R-A combines the debris-deflecting advantages of a raised coaming with the total environmental immunity of high-grade stainless steel. By elevating the sealing face above deck levels, it prevents corrosive sloshing water or process fluids from pooling around the perimeter. The stainless steel multi-bolt layout eliminates the risk of rust-binding or frozen fasteners common on exposed commercial decks, ensuring that the hatch can always be quickly and safely unbolted for inspection.

Intended Use Cases:

• Chemical & Corrosive Fluid Tanks: Outstanding selection for direct access into chemical cargo cells, wastewater holdings, or harsh industrial process tanks.
• Severe Marine Exposure: Built for open weather decks, swim platforms, and work zones constantly hammered by high-salinity ocean spray.
• Sanitary & Potable Water Holds: Non-reactive stainless steel construction makes this model ideal for clean drinking water storage on large vessels and marine structures.

Primary Industries & Vessel Types:

• Chemical & Liquid Product Barges: Heavily utilized on specialized transport vessels requiring strict cargo purity and chemical containment.
• Commercial Fishing & Seafood Processing: Built to withstand aggressive organic tracking, blood, and daily high-pressure chemical sanitization on factory ships.
• Offshore Supply Vessels (OSVs) & Drilling Rigs: Ideal for extreme offshore environments where regular steel components suffer rapid pitting.

• Raised Coaming Profile: Features an elevated vertical frame wall that acts as a natural barrier against pooling water, mud, and debris on active work decks.
• 16-Bolt Perimeter Security: Utilizes a rugged, 16-point heavy-duty bolt pattern around the circumference to deliver uniform, high-torque gasket compression and maximum pressure retention.
• Premium Stainless Steel Construction: Cover plate, raised coaming, and fasteners are crafted from high-grade stainless steel for extreme structural strength and superior resistance to chemical pitting.
• Buna-N High-Compression Gasket: Features a premium Buna-N (Nitrile) rubber gasket track providing excellent sealing performance and broad resistance to fuels, oils, and marine chemicals.
• Industrial Clean Finish: Delivered fully finished and polished, offering a professional appearance that eliminates the need for painting, priming, or coating maintenance.
• Ships as a Complete System: Sold as a complete, ready-to-install assembly containing the stainless steel cover plate, raised stainless coaming frame, and all matching stainless fasteners.

• Qualified Personnel Requirement: Installation of the 18” stainless steel raised manhole must be performed by qualified marine welders or fitters in accordance with applicable classification society standards.
• Stainless Steel Welding Notice: Appropriate stainless steel welding procedures, including correct filler rods and shielding gases, must be utilized when integrating this frame into the deck structure to preserve its corrosion-resistant properties.
• Galling Prevention: Always apply a high-quality marine anti-seize lubricant specifically rated for stainless steel to all bolt threads before tightening to completely prevent thread galling or cold-welding.
• Perimeter Sealing Verification: Tighten all 16 bolts in a progressive, alternating star pattern rather than a circular sequence. This ensures perfectly even gasket compression and a uniform seal across the entire perimeter frame.
• Debris Inspection: Prior to closure, ensure that the gasket track, coaming rim, and internal tank lip are completely free of weld spatter, slag, rust, or heavy topcoat accumulation.