ISO 5480:2020 pdf download – Ships and marine technology — Guardrails for cargo ships.
5 Design, construction and installation 5.1 Principal dimensions 5.1.1 The height of the toprails shall be at least 1 000 mm. This dimension shall be measured from the top of the toprail to the deck at a point vertically below the inner edge of the toprail, or, if the deck has a waterway, to the top of the deck plank or covering next to the waterway (see Figure 1 and Figure 2). 5.1.2 The opening below the lowest course of rails shall be of 230 mm maximum, measured from the underside of the rail to the deck or flat bar side plate where fitted (see Figure 1 and Figure 2). 5.1.3 The opening between the upper courses shall be of 380 mm maximum (see Figure 1). 5.1.4 The maximum distance between stanchions shall be 1 500 mm [see Figure 4 a)]. 5.2 Stanchions Stanchions for guardrails shall be made of steel flat bars of 60 mm × 15 mm, or of flat bars having a section modulus (see ISO 80000-4) at least equal to that of 60 mm × 15 mm flat bars. 5.3 Rails 5.3.1 Steel toprails shall be made of tubes of minimum 34 mm outside diameter, with a wall thickness of at least 2,6 mm, or of tubes having at least an equivalent section modulus, and shall be welded to stanchions. 5.3.2 Where wooden toprails are required, they shall be 125 mm × 60 mm, made from first quality teak and free from defects such as wanes, splits and checks. Other hardwoods may be used provided that they are at least as suitable in all respects. 5.3.3 Lower rails shall be made of solid round bars of at least 19 mm diameter. As an alternative, tubes of 26,9 mm outside diameter with a wall thickness of at least 2,3 mm, or tubes having at least an equivalent section modulus, may be used. The rails shall be welded to the inside edge of stanchions or passed through holes in the stanchions and welded in position.