Flanged HDPE marine boom, marine boom system, and lug plate

A marine boom system comprises

• at least one High-Density Polyethylene (HDPE) marine boom including:
• an elongated generally cylindrical shell including an inner layer and an outer layer, where the inner layer and outer layer are formed from HDPE with a same formulation, with the inner layer further including at least 2% carbon black by mass and the outer layer does not include carbon black and the outer layer further including a colorant with ultraviolet stabilizers and the inner layer does not include the colorant, the inner layer being thicker than the outer layer, where the inner layer and outer layer have been coextruded to form a unitary body, the elongated generally cylindrical shell defining a cavity, the elongated generally cylindrical shell having first and second ends;
• first and second caps formed from a same material as the outer layer disposed about the first and second ends respectively, each cap including a generally cylindrical main body having an outer diameter and an inner diameter equal to an outer diameter and an inner diameter of the elongated generally cylindrical shell, and an end wall extending across one of the first and second ends of the generally cylindrical main body, and a circumferential annular cap flange extending radially from the generally cylindrical main body and having an inner flange diameter equal to the outer diameter of the generally cylindrical main body and having an outer flange diameter greater than the outer diameter of the generally cylindrical main body, the circumferential annular cap flange having a plurality of equal sized apertures disposed about the circumferential annular cap flange at equal radial placement and at equal circumferential spacing, where the other of the first and second ends end of the generally cylindrical main body of each of the first and second caps are axially aligned with the first and second ends of the elongated generally cylindrical shell respectively and are fusion welded together across a full thickness and around a full circumference of the first ends and the second ends and forming a watertight seal;
• and
• a floatation billet disposed within the cavity in the elongated generally cylindrical shell.