BS EN ISO 8849:2021 pdf download.Small craft – Electrically operated bilge pumps. 4 General requirements 4.1 Bilge pumps shall be designed to operate (or a continuous 24-hour peflod at 87.5 % of nommal voltage. up to their design voltage at the point within the range ol perfonnance recommended for the pump that results in the highest power consumption 42 Bilge pumps and devices used to convert bilge pumps to automatic operation (automatic pumps) installed in compartments where explosive vapour and gasses may acnimulate shall meet the ignition protection requirements specified in 150884h.1990 4.3 BIlge pumps and dr’icvs used to convert bilge pumps to automatic operation (automatic pumps) shall meet the electrical reqwrements of 1St) 13297:2020. 4.4 BIlge pumps shell be rated In litres of water flow per minute or per hour at nominal voltage, at static pressures 0(0 kPa. 10 kPa and 20 kPa. i.e. heads of 0 m, I m and 2 in. discharging through a smoothbore hose fixed to the pump-outlet of an Inside diameter equal to the pump outlet outside diameter and ola length equal to L,S times the lift The pump rating and apacitieu shall be stated in the Installation and opt-rating instructions provided with the pump, The pump rating shall Include the maxlnlunl output pressure and liii at which the pump ceases operation. I.e. the discharge of water, 4.S Bilge pumps shall he provided with means of securely fastening them to the craft. 4.6 Materials used in the construction of bilge pumps, which can be expected to come in contact sith sea water. shall be — selected or coated to be resistant to corrosion; — galvanically compatible: and — resistant to deterioration by bilge-cleaning agents and intermittent exposure to petrol (gasoline). oil and diesel fuel. 4.7 Submersible pumps shall be provided with a strainer or other means of preventing debris 1mm entering the pump udet Inlet strainers and iuieena shall be designed such that they can be cleaned. 4.8 Installation and operateng instructions shall be available for each bilge pump An electrical diagram shall he provided. It shall identify each conductor and shall include the proper location of the control switch(es) in the circuit and the bonding connection, if applicable. The recommended overcurrent protection for non-integrally protected bilge pumps shall be stated. 4.9 Centrifugal and axial flow pumps shall be capable of operating dry at their design voltage for at least 7 h without creating...
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