BS EN 15625 pdf free download

BS EN 15625-2021 pdf free download.Railway applications – Braking – Automatic variable load sensing devices.
5.2.3 Mechanical requirements
The automatic variable load sensing device shall be designed for a static force F of at least 60 kN. The maximum force shall not cause any damage or change of its characteristic. This shall be tested in accordance with 6.2.6.1.
5.2.4 Tightness
Leakage of the automatic variable load sensing device shall be such that technical performance as specified by this document is met without restrictions.
The sealing arrangement within the automatic variable load sensing device shall prevent any unacceptable loss of air.
At an environmental temperature of (20 ± 5) °C, the automatic variable load sensing device shall not have a leakage rate greater than 0,005 NI/mm when tested at a pressure of (7,0 ± 0,1) bar. This requirement shall be tested in accordance with 6.2.5.
At an environmental temperature of —25 °C, also at +70 °C, the automatic variable load sensing device shall not have a leakage rate greater than 0,01 NI/mm when tested at a pressure of (7,0 ± 0,1) bar. This requirement shall be tested in accordance with 6.2.7.
At —40 °C < environmental temperature < —25 °C an automatic variable load sensing device shall have a leakage rate not greater than 0,1 Nl/min when tested at a pressure of (7,0 ± 0,1) bar in accordance with
6.2.7.
5.3 Fire behaviour
The fire behaviour of the automatic variable load sensing device shall correspond to the requirements of
EN 45545-2:2020.
BS EN 15625:202 1
EN 15625:202 1 (E)
5.4 Shock and vibration
The design of the automatic variable load sensing device shall consider outside influences, e.g. impacts and vibrations, and protect the device appropriately.
The automatic variable load sensing device shall be able to operate without restriction under shock and vibration conditions as specified in EN 61373:2010. The class and category of test severity shall be declared by design documentation.
These requirements shaLl be tested in accordance with 6.2.8.
5.5 Service life
No specific requirements for the automatic variable load sensing device to attain a particular service life are contained in this document.
Any testing to estimate the service life of an automatic variable load sensing device should be conducted as part of the product development.
NOTE The service life of the automatic variable load sensing device is a function of the environment/operating conditions in which the automatic variable load sensing device will function, and the requirements for the automatic variable load sensing device to achieve a serviceable life in accordance with the maintenance requirements of the vehicle to which it is fitted.
5.6 Compressed air quality
It shall be possible to operate the automatic variable load sensing device without restrictions with at least the compressed air quality in accordance with the following classes defined in ISO 8573-1:20 10:
— class 3 — for the maximum particle size and the maximum concentration of solid contaminants;
— class 4 — for the water dew point;
— class 4 — for the maximum total (droplets, aerosols and vapours) oil concentration.
The automatic variable load sensing device shall be capable of operating in an air supply system that is not fitted with an air dryer, or when the air dryer is out of order. The air system should therefore include some means of preventing water collecting within the automatic variable load sensing device and hence freezing of the water in conditions below 0 °C.
5.7 Environmental conditions
5.7.1 General
All the environmental requirements listed shall be taken into account within the design concept of the components. However only the assessment tests listed in Clause 6 shall be performed. The remaining proofs shall he presented in the declarations of conformity.
5.7.2 Ambient temperature
The automatic variable load sensing device covered by this document shall be able to operate from —40 °C to +70 °C in accordance with the requirements of this document.
5.7.3 Altitude
The automatic variable load sensing device shall be able to operate without restrictions up to an altitude of 2 000 m above sea level.BS EN 15625 pdf download.