Marine Double Bollard, also known as Double Bitt Boat Bollard.
GBT554-1996 specifies the Type A marine double bollard, a symmetrically designed mooring fixture with two horns extending from a central base, fabricated from steel plate for robust maritime use.
Engineered to secure vessels to docks or piers, it withstands high loads and is typically bolted to concrete or steel foundations.
The standard defines dimensions, material requirements, and testing protocols, including strength and durability benchmarks.
Technical provisions address installation specifics: the base height (h) represents minimum values for steel decks, requiring 15mm elevation above wooden deck surfaces; optional stainless steel cladding (grade 1Cr18Ni9Ti) may cover bollard horns; units with nominal diameters ≤500mm may be constructed from seamless steel pipes or welded plates, while those ≥250mm can incorporate baffles as needed.
Compliance encompasses marking, labeling, and accompanying documentation.