BS EN 1502-2020 pdf free download.Inland navigation vessels — Boarding stairs
This document applies to boarding stairs for inland navigation vessels. Boarding stairs are used on inland navigation vessels for a safe transition into ship’s boats, safe disembarking to the shore or a safe crossing over onto vessels with lower decks.
This document specifies safety requirements on the design, dimensions and strength and test methods for outboard stairs.
Boarding stairs are designed for vessels having a boarding height greater than 1,5 m above the light water-line. They can be used up to a height of around 3,0 m above the light water-line.
Boarding stairs are not intended for use by passengers.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 22768-1, General tolerances – Part 1: Tolerances for linear and angular dimensions without individual tolerance indications (ISO 2768-1)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1 boarding stair
movable device with steps to be attached to the vessel’s side for comfortable boarding and disembarking
3.2 string
<inland navigation> lateral limitation of a boarding stair supporting the steps
3.3 step
<inland navigation> tread of the boarding stair
3.4 inclination angle
<inland navigation> angle between the pitch line connecting the front edge of the steps and the horizontal line
3.5 handrail
<inland navigation> component parallel to the string (3.2) serving as handhold and as fall protection
4 Safety requirements
4.1 Dimensions
General tolerances: ISO 2768 – c (see EN 22768-1).
Dimensions are given in Figure 1, and Table 1.
Edges shall be rounded to min. R 1,5 mm.
Data which have not been specified shall be selected as appropriate.
4.2 Parts
4.2.1 General
Boarding stairs are not expected to conform to the designs illustrated here; however the dimensions and specifications given shall be followed. Maximum permissible masses are given in Table 1.
4.2.2 Strings
Strings shall be made of rectangular hollow profile.
4.2.3 Steps
Steps shall be made of rectangular hollow profile.
4.2.4 Handrails and beam
4.2.4.1 The handrails and the beam shall be made from tubular section.
4.2.4.2 The handrails shall be fitted on both sides. The handrail on the left hand side, as one ascends, shall only be extended to the top of the string.
4.2.4.3 The handrails shall run parallel to the string up to the third step from the bottom and attached to the string between the second and third step from the bottom.
4.2.4.4 It shall be possible to grip the handrail on the right hand side horizontally at its upper end.
4.2.4.5 The beam is placed on the upper end of the right string and connects both parts of the handrail with the string on the right hand side.
4.2.4.6 The upper end of the handrails shall lead back downwards so that it forms, at the right hand side together with the beam, a hook for attaching the outboard stairs to the vessel’s side, see Figure 1.
4.2.5 Spacer
4.2.5.1 The spacer shall be large enough to ensure an inclination angel of 75°+0°/-10°.
4.2.5.2 Where the spacer comes into contact with the vessel’s side, it shall be designed so that the contact surface is not less than 500 mm wide or the contact points are at least 500 mm apart.
4.2.5.3 The spacer shall be attached to the two strings. If it is of the folding type, it shall automaticly lock by bringing in its operating position.
4.4 Strength
4.4.1 The steps shall be designed for a rated load of 1,5 kN.
4.4.2 The boarding stair shall be designed for two rated loads of 1,5 kN each, applied simultaneously to the top and bottom steps.
4.4.3 Each handrail shall be able to withstand a force of 0,3 kN applied in any direction.
5 Construction
5.1 Welded construktion
Any connections, except the spacers, shall be welded. The welds on the hollow sections shall be watertight.
5.2 Buoyancy
Boarding stairs shall be buoyant.
5.3 Safe tread
The treads of the steps shall be non skid.
5.4 Edges
Boarding stairs shall not have burrs or other sharp points that can lead to injuries.
5.5 Mass
The mass of a boarding stair shall not exceed the values given in Table 1.
5.6 Materials
Boarding stairs shall be made of appropriate materials, e.g. aluminium or FRP (fibre reinforced polymers).
NOTE Examples for suitable semi-finished aluminium products are given in EN 485-1 or EN 754-1.
Exposed surfaces shall be resistant against impact of weather, UV-rays and oil/fuel or durably protected.BS EN 1502 pdf download.