ISO 23055:2020 pdf download

ISO 23055:2020 pdf download.ISO 23055:2020 pdf download.Ships and marine technology — Design requirements for international ballast water transfer connection flange
1 Scope
This document specifies the material requirements and dimensions of an international flange for the transfer of ballast water between a ship and a shore reception facility, or between ships.
It does not address any reconfiguration of the ship’s ballast water piping system necessary to connect to the shore-side, e.g. construction of piping from the ship lower machinery levels to the main deck transfer area.
2 Normative references
There are no normative references in this document.
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:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1 international flange for ballast water transfer systems
pipe fitting installed on both the ship and shore side of a ballast water transfer system, having standardized dimensions to facilitate worldwide connectivity
3.2 maximum allowable working pressure
highest stress to which a piping system component can be subjected, based on materials, thickness and design calculations
4 Abbreviated terms
DN diameter nominal
PN pressure nominal
MAWP maximum allowable working pressure
5 Materials and equipment
5.1 General
International flanges for ballast water transfer systems shall be flat-faced and of steel or equivalent material construction. Flanges shall be galvanically compatible with the piping system to which they are installed. All other parts of the system shall be constructed of materials suitable for the service intended. Fasteners shall be of corrosion-resistant materials that are galvanically compatible with the material of the flange. Flanges shall be designed and manufactured in accordance with the dimensions specified in Clause 7. To meet the dimensional and pressure-rating requirements of this document, the flanges should meet the design and testing requirements of a recognized national or international flange standard, such as DIN 2632, DIN 2633, BS EN 1092, ASME B16.5, JIS B2220, GB/T 2501 or other equivalent design standard.
5.2 Pressure rating
The flange shall have a minimum pressure rating of not less than 1 MPa (145 psig).
NOTE Normally, a flange of at least a PN 10 rating satisfies this requirement.
5.3 Non-metallic materials
Gaskets and associated parts shall be of materials suitable for the MAWP and seawater service.
5.4 Accessories
The international flange for ballast water transfer systems shall be supplied with eight bolts and the corresponding nuts and washers.
6 Workmanship
Welding personnel shall be qualified in accordance with recognized standards, and welding materials in accordance with recognized standards shall be utilized.