EN ISO 9093-2021 pdf free download – Small craft ‑ Seacocks and through‑hull fittings (ISO 9093:2020).
4Material requirements4.1General
Materials used for through-hull fittings,seacocks, hose connections and fittings located below themaximum load waterline shall be corrosion-resistant.
Materials used above the waterline shall be corrosion resistant or shall have protection againstcorrosion,taking into account the various and changing media that pass through the fitting (for examplefresh, 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 ISO6509-1:2014and assessed in accordance with ISO 6509-2:2017.
4.2Material combinations
The combination of different materials including fastening elements shall take into consideration thepossibility of galvanic action.
Materialsthatactgalvanically with others usedin thesystem may be usedifthey aregalvanically isolated.The combination or choice of non-metallic materials shall be made taking into account the possibility ofswelling 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 incorporatedin the system.
4.3Resistance to deterioration/corrosion tests
All metallic components shall be corrosion resistant. The requirement for corrosion resistance shall bemet through testing as per Annex B.
All non-metallic parts shall be stabilized against oxidation and UV.The requirement for UV stabilisationshall be met through testing as per Annex C.
4.4Strength requirements
Seacocks, through-hull fittings and hose fittings shall fulfil the requirements of the strength testaccording to Annex A.
4.5 Range of operating temperatures4.5.1 General operating requirements
Seacocks and through-hull fittings shall be operable through the full temperature range of 0 °℃ to +60 C and shall show no defect that will impair their function.
4.5.2Storage temperature requirement
Seacocks and through-hull fittings shall withstand a storage temperature without operation of -40 Cto +60 °C when kept dry.
4.5.3 High temperature operating test
Seacocks shall be filled with water and, after preconditioning for 24 h at 60 C, shall be operable.
4.5.4 Low temperature operating test
Seacocks shall be filled with salt water and, after preconditioning for 24 h at 0 °C, shall be operable.NOTE
Salt water test liquid is defined in ISo 14993;2018,Clause 4,
5 Through-hull fittings
5.1Thread identification
lf the fitting is threaded, the manufacturer shall identify the size and type of thread by permanentlymarking the fitting or the packaging.
Some examples of through-hull fittings are given in Table 1.Other types are acceptable if equivalentstrength and tightness are demonstrated.
5.2General design requirements
The through-hull fitting shall present a secure and watertight connection that cannot be dislodged byoutside forces due to operation of the fitting and components attached to it, e.g. a seacock.
5.3 Detailed design requirements
5.3.1Stem
The stem length shall be sized considering the varying hull thicknesses, depending on the hull materialand construction.
After installation, the minimum remaining thread length shall be at least 1,5 times the minimum threadlength specified in Table 2.
The wall thickness of the stem shall ensure that the remaining strength after machining is adequate forthe torque applied during installation and the use of the fitting.
5.3.2 Flange diameter
The diameter of the plate shall not be less than that of the flanged nut or counterplate.5.3.3 Finish
The surface of the plate, nut or counterplate shall not present a sharp edge towards the hull.Edges shallbe rounded or chamfered.
6 Seacocks — Design requirements6.1 General
The seacock shall be designed to permit:
– operation under any condition likely to be encountered under normal service conditions;- a visual check of the open and closed position.
The length of the handle and the clear distance between handle and intake and discharge line shall besufficient to allow for easy operation.
The design of the seacock shall ensure that no part can come loose under normal service conditions.EN ISO 9093 pdf download.