Cast Steel Semi-Elliptical Dished Head (Model #ICF-SE-29)

This structural cast steel semi-elliptical dished head serves as a critical boundary closure for pressurized or vacuum-sealed storage lines, dry void compartments, and cargo tanks on commercial vessels. Positioned at the terminal ends of cylindrical vessels or within internal structural partition walls, it manages multidirectional force loads safely across its contoured geometry. By eliminating sharp angular corners, the cast assembly evenly distributes lateral and longitudinal pressure stresses, preventing localized deformation of the joining welds and safeguarding the vessel’s fluid containment system under severe working loads and high sea states.

Intended Use Cases:

• Complete end closure for high-pressure or atmospheric fluid cargo tanks.
• Internal bulkhead capping for structural dry voids and buoyancy compartments.
• Terminal block isolation for heavy industrial piping and manifold casing lines.
• Shipyard refits on existing hulls requiring code-compliant, rugged structural tank heads.

Primary Industries & Vessel Types:

• Liquid chemical transport vessels, fuel oil barges, and asphalt barges.
• Inland river pushers, commercial harbor tugs, and offshore supply vessels (OSVs).
• Offshore drilling platforms, specialized dive support barges, and dredges.
• Heavy marine infrastructure machinery and shore-side marine storage terminals.

• Optimal Pressure Containment: Classic 2:1 semi-elliptical shape provides high structural efficiency, containing pressures through pure tensile distribution.
• Thick Seamless Casting: Uniform wall thickness across the entire dish eliminates the localized thinning risks associated with spun or stamped metal plates.
• Weld-Ready Straight Flange: Machined perimeter flange provides a flat, secure fitment rim for seamless integration into corresponding cylindrical shell walls.

• Cylindrical Shell Layout & Prep: Align the straight flange rim of the #ICF-SE-29 dished head flush against the open edge of the matching 29-inch cylindrical tank wall or shell, ensuring the joint prep zone is flame-beveled and ground down to bare white metal.
• Fit-Up Alignment Check: Verify concentric alignment and uniform gap clearance around the entire perimeter interface to guarantee a uniform weld joint profile according to marine engineering specifications.
• Welding Execution & Pre-Heat: Pre-heat the cast steel head rim and matching tank shell to recommended shipyard temperatures matching the specific steel grade metallurgy, then execute a continuous full-penetration structural butt weld using low-hydrogen electrodes (AWS D1.1 standard).
• NDT Structural Inspection: Allow the completed weldment to cool slowly and naturally under an insulating thermal blanket to prevent cold cracking, then perform mandatory radiographic, ultrasonic, or dye penetrant NDT checking to verify a code-compliant, zero-leak boundary.
• Corrosion Protection Sealing: Wire-brush away any residual weld slag, clean the area, and immediately coat the raw weld lines and heat-affected zones with high-solids marine primer or epoxy barrier coatings to guard against internal and external rust.