BS EN 13731:2008 pdf free download – Lifting bag systems for fire and rescue service use一Safety and performance requirements.
5.3.6 Couplings on the inlet side of a control device, except those connected directly to the energising source, shall be quick-action couplings in accordance with 5.3.5 or shall be automatically self-sealing.
5.3.7 It shall be possible to connect and disconnect hose assemblies whilst wearing protective gloves for firefighters according to EN 659 and without the use of separate tools.
5.4 Regulators
5.4.1 Regulators shall be included in the lifting bag system as close as possible to the air supply. NOTE A manual pump can fulfil the function of a regulator as defined in 3.16.
5.4.2 Regulators shall conform to EN ISO 2503.
5.4.3 Regulators supplied without gauges shall be pre-set and not readily adjustable to prevent unauthorised adjustment (i.e. by design making the use of a tool necessary, by a recessed adjustment device or by a sealed cover). The maximum inlet and outlet pressures shall be clearly indicated on such regulators.
5.4.4 Regulators shall be able to control the flow rate over the complete range they are intended for.
5.5 Control devices
5.5.1 Control devices shall conform to the relevant parts of EN 894.
5.5.2 To enable the operator to set the regulator the inlet to a control device(s) shall be unambiguously marked with the allowable pressure at the inlet.
5.5.3 The control device shall permit the speed of inflation and deflation of the lifting bag to be gradually and progressively varied under the operator’s control.
5.5.4 The control device shall be legibly and indelibly marked or labelled to indicate all directions of operation.
NOTE Where two or more control devices are connected to the same inlet(s), hose assemblies on the outlet side should preferably be colour coded.
5.5.5 When a manual actuator on a control device is actuated in a direction of operation, the lifting bag shall operate only in the direction selected.
5.5.6 When a manual actuator is moved from any position of actuation to a neutral position, the flow of compressed air shall cease within 0,5 s.
5.5.7 When a manual actuator is released, it shall automatically return to the neutral position within 0,55.
5.5.8 Where a system includes two or more control devices connected to the same inlet(s), the operation of one manual actuator shall only inflate or deflate the lifting bag to which it is connected, regardless of the position of other manual actuators.
5.5.9 Operation of one or more control devices in the direction of inflation shall not lead to the deflation of any bag when:
a) supply connection to the control device is disconnected, or
b) supply of compressed air is exhausted or is at pressures less than the pressure in a lifting bag, or
c) there is a sudden line break of the supply hose to the control device.
5.5.10 Where a control device is provided with more than one inlet connection for energising sources, it shall not be possible for the compressed air from one connection to pass out of another inlet with and without hose connected.
5.5.11 Control devices shall withstand a pressure of 2 times allowable pressure without leakage.
5.5.12 It shall be possible to operate the control device while wearing protective gloves for firefighters
according to EN 659.
5.6 Pressure indicators
5.6.1 A pressure indicator displaying the pressure in the lifting bag shall be provided in a position at which it can be read unambiguously by the operator while operating the control device.
5.6.2 Pressure gauges shall conform to EN 837-1, EN 837-2 or EN 837-3. NOTE The markings and/or the pointer can be luminescent or illuminated.
5.7 Safety valves
5.7.1 Safety valves shall comply with EN ISO 4126-1 and shall be provided with means to lock and/or to seal all external adjustments in such a manner so as to prevent unauthorised adjustments of the safety valve (i.e. by design making the use of a tool necessary, by a recessed adjustment device or by a sealed cover).