EN ISO 9093:2021 pdf download.Small craft一Seacocks and through-hull fittings
1 Scope
This document specifies requirements for through-hull fittings, seacocks, hose connections, their fittings and their installation in small craft with a length of hull, LH, as defined in ISO 8666:2020,of up to 24m.
This document is not applicable to engine and heater exhaust fittings, and sail drive through-hull fttings.
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.
ISO 4892-3:2016, Plastics一Methods ofexposure to laboratory light sources一Part 3: Fluorescent UV lamps
ISO 6509-1:2014, Corrosion of metals and alloys一Determination of dezincification resistance of copper alloys with zinc一Part 1: Test method
ISO 6509-2:2017 Corrosion of metals and alloys一Determination of dezincification resistance of copper alloys with zinc一Part 2: Assessment criteria
ISO 14993:2018, Corrosion of metals and alloys一Accelerated testing involving cyclic exposure to salt mist, dry and wet conditions
4.1 General
Materials used for through-hull fittings, seacocks, hose connections and fittings located below the maximum load waterline shall be corrosion-resistant.
Materials used above the waterline shall be corrosion resistant or shall have protection against corrosion, taking into account the various and changing media that pass through the fitting (for example fresh, salt or brackish water with impurities; waste water from toilet systems or holding tanks).
Brass materials shall be dezincification resistant (DZR) when tested in accordance with ISO 6509-1:2014 and assessed in accordance with ISO 6509-2:2017.
4.2 Material combinations
The combination of different materials including fastening elements shall take into consideration the possibility of galvanic action.
Materials that act galvanically with others used in the system may be used ifthey are galvanically isolated.
The combination or choice of non-metallic materials shall be made taking into account the possibility of swelling and/or seizure.
Materials in contact with each other shall not prevent the device and/or system from acting as intended.
Non-ferrous metals other than aluminium alloys shall not be used when aluminium is incorporated in the system.
4.3 Resistance to deterioration/corrosion tests
All metallic components shall be corrosion resistant. The requirement for corrosion resistance shall be met through testing as per Annex B.
All non-metallic parts shall be stabilized against oxidation and UV. The requirement for UV stabilisation shall be met through testing as per Annex C.
4.4 Strength requirements
Seacocks, through-hull fittings and hose fittings shall fulfil the requirements of the strength test according to Annex A.EN ISO 9093 pdf download.