BS EN ISO 8849 pdf free download
BS EN ISO 8849-2021 pdf free download.Small craft – Electrically operated bilge pumps.
4 General requirements
4.1 Bilge pumps shall be designed to operate for a continuous 24-hour period at 87,5 % of nominal voltage, up to their design voltage at the point within the range of performance recommended for the pump that results in the highest power consumption.
4.2 Bilge pumps and devices used to convert bilge pumps to automatic operation (automatic pumps) installed in compartments where explosive vapour and gasses may accumulate shall meet the ignition protection requirements specified in ISO 8846:1990.
4.3 Bilge pumps and devices used to convert bilge pumps to automatic operation (automatic pumps) shall meet the electrical requirements of ISO 13297:2020.
4.4 Bilge pumps shall be rated in litres of water flow per minute or per hour at nominal voltage, at static pressures ofO kPa, 10 kPa and 20 kPa, i.e. heads ofO m, 1 m and 2 m, discharging through a smooth- bore hose fixed to the pump-outlet ofan inside diameter equal to the pump outlet outside diameter and ofa length equal to 1,5 times the lift.
The pump rating and capacities shall be stated in the installation and operating instructions provided with the pump.
The pump rating shall include the maximum output pressure and lift at which the pump ceases operation, i.e. the discharge of water.
4.5 Bilge pumps shall be provided with means ofsecurely fastening them to the craft.
4.6 Materials used in the construction of bilge pumps, which can be expected to come in contact with 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 from entering the pump inlet. Inlet strainers and screens shall be designed such that they can be cleaned.
4.8 Installation and operating instructions shall be available for each bilge pump. An electrical diagram shall be 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 a fire hazard. Alternatively, a means integral with the pumps shall be provided to shut the pump off automatically to prevent a fire hazard.
4.10 Positive or semi-positive displacement pumps, i.e. those in which the impeller can be in continuous contact with the housing when operating dry, shall be capable of operating dry at their design voltage for at least 5 mm without damage to the impeller or housing and for at least 1 h without creating a fire hazard. Alternatively, a means integral with the pumps shall be provided to shut the pump off automatically to prevent a fire hazard. Information shall be provided in the owner’s manual cautioning against operating the pump dry for more than 1 mm.
5 Electrical requirements
5.1 Submersible pumps shall have watertight electrical connections, IP 67, in accordance with
IEC 60529:2013.
The use of a length of watertight electrical cable sealed at the pump connection is recommended, so that connections to the power supply can be made above the critical bilge-water level.
5.2 Metallic parts of a DC pump housing that can be exposed to contact with bilge water and can become a source of stray current leakage shall have provisions for equipotential bonding conductor connections.
Pumps designed with a double-insulated electrical system, requiring a break in two distinct insulation systems before electrical leakage can reach exposed metallic parts, do not require a bonding connection.
5.3 Bilge pumps shall be protected against continuously locked rotor conditions by
— integral overcurrent protection, or
— overcurrent protection in the circuit of a size to protect the bilge-pump motor,
— being capable of sustaining operation with a locked rotor for 7 h without generating surface temperatures in excess of 150 °C, at an ambient temperature of 60 °C, and without evidence of charring, burning or melting,
— temperatures not exceeding 150 °C when the pump operates at 120 % of nominal voltage in an ambient temperature of 60 °C for 7 h.
5.4 DC bilge pumps shall be capable of withstanding a DC voltage of 500 V for 1 mm without leakage in excess of 1 mA. The test voltage shall be applied between the current-carrying parts and the noncurrent-carrying metal parts. If the pump is internally earthed, the earth connection shall be broken in order to carry out this test.
AC bilge pumps shall be fitted with or supplied by a circuit protected by a residual current device (RCD).
5.5 Bilge pumps designed for automatic operation (automatic pumps) shall be provided with an override switch to permit manual operation if the automatic operation fails.BS EN ISO 8849 pdf download.
