BS/EN 14043-2014 pdf download.High rise aerial appliances for fire and rescue service use Turntable ladders with combined movements Safety and performance requirements and test methods.
5.1.2.2.2 DynamIc stability
The minimum residual force FRmn shall be greater than 0 in the least favourable position of the turntable ladder when standing on a hard flat horizontal surface (0 * 0,5)°.
Verification
Verification methods 1 and 2 shall be carried out as part of the type test. Verification method I is also relevant to fitness for purpose testing/use (reception test) — see Table Dl.
Verification methoI 1:
Demonstrate the dynamic stability with the following test load:
The supporting wheels and vertical jacks of the vehicle located on the side of the longitudinal central axis of the vehicle where the residual vertical force will be reduced during the application of the test load and dynamic forces shall be supported by the load weighing device, as indicated at Figure 8 A and Figure 88 as appropriate. The minimum residual force applied by the wheels and jacks to the supporting surface shall be the load indicated by the weighing device. The test shall be carried out on a hard flat horizontal surface (0± Q,5)0
During the course of the dynamic tests, carry out the movements at maximum permissible ladder speed under normal operating conditions, the movements being stopped using the emergency stop or the dead man’s device.
For the purposes of the dynamic tests, position the ladder in such a way that the slewing angle 0, the jacking width and the load correspond to the least favourable position identified during the course of the test described in 5.1.2.2.1. The slewing angle shall be within ± 10 of the required value.
For the purpose of the dynamic test for lowering, position the ladder to the maximum possible elevation angle a, and then operate the lowering control device. Check the minimum residual force during movement and for 10 s after movement is ceased.
For the purposes of the dynamic test for raising, set the ladder in such a way that the projection and height correspond to the maximum permissible projection and height for slewing angle 8, jacking width and load corresponding to the least favourable position identified during the course of the test described in 5.1.2.2.1. The slewing angle shall be within ± 1 of the required value. Then operate the raising control device. Record the minimum residual force for 10 s before the movement commenced and during the movement.
An example of table to report the result of the stability test is given in Annex A (see Table A. 1).
Verification method 2:
For the purpose of the tests – if necessary – secure the turntable ladder vehicle against overturning at two anchoring points without affecting the validity of the tests, position the ladder in such a way that the slewing angle 0, the jacking width and the load correspond to the least favourable position identified during the course of the test described in 5.1.2.2.1. The slewing angle shall be within ± 10 of the required value.
Measure the minimum residual force FR,, according to 5.1.2.2.1.
The supporting wheels and vertical jacks of the vehicle located on the side of the longitudinal central axis of the vehicle, where the residual vertical force will be reduced during the application of the test load, shall be supported by the load weighing device, as indicated at Figure 8 A and Figure 8 B, as appropriate. The minimum residual force applied by the wheels and jacks to the supporting surface shall be the load indicated by the weighing device. The test shall be carried out on a hard flat horizontal surface
(0± Q5)0
Position blocks 180mm in height under the wheels on the weighing device and – if necessary – under the baseplates of the jacks.
Test procedure:
— load the ladder set with the test load P = 1,1 x + Pz.
— raise the ladder set up to en angle 01+150 from the horizontal:
— slew the ladder set to a position at 90° to the longitudinal axis of the vehicle as indicated at Figure 8:
— extend the ladder set to a position I m before the maximum permitted extension;
— lower the ladder set by an angle of 10° at maximum speed and conduct an immediate and sudden stop of the movement using the emergency stop or the dead meWs device;
— check whether the residual force is greater than 0 during the 10 s immediately following the cessation of movement.BS/EN 14043-2014 pdf download.