BS EN 15220-1:2009 pdf download
BS EN 15220-1:2009 pdf download.Railway applications – Brake indicators Part 1: Pneumatically operated brake indicators.
4.2 Operating conditions
The brake indicator shall be able to function:
4.2.1 When the upper pressure Irnilt of the compressed air used is 10 bar It shall be able to withstand a hydraulic test with a pressure of 15 bar ii accordance with 5.3.3.
42.2 Where the quality of the compressed air is at least class 4-4-4 according to ISO 8573-1. This requirement is verified when tests are can-led out m accordance with 5.3.7.1.
4.2.3 In the temperature range for the environmental conditions to which the railway vehicle is submitted during Its operation. The purchaser can specify a higher temperature value if operational constraints demand it. This requirement Is tested In accordance with 5.3.7.1 and 5.3.7.2.
42.4 To withstand the external ingress of dust and water as specified in EN 60529 (code IP 55). These requirements are tested in accordance with 5.3.4.
NOTE It i be necessary to use protection dass IP 65 for ,‘edlcamors fitted wlh eledrical mponents.
4.2.5 To withstand the external corrosion due to normal atmo5pheric pollutants as specified in EN 50125-1 the brake indicator shall be tested m accordance with the test shown in 5,3.12,
4.2.6 The brake indicator shall be able to function in the vibration envwonment. as described in EN 61373. of the railway vehicle on which it is mounted.
4.2.7 The brake indicator shall be able to withstand shocks and shall be tested in accordance with 5.3.10.
4.3 Functional characteristics
4.3.1 General
The following requirements are defined to ensure that no malfunction of the brake indicator occurs:
4.3.2 Brakinglrelease status
The operating conditions of the braklnglrelease flag and Its change in status is defined and shall be tested In
accordance with 5.3.8.
4.3.3 Lubrication
It shall be possdle to operate the brake mdicator at all pressures without additional lubrication
4.3.4 Leakage
The sealing arrangement within the brake indicator shall prevent any unacceptable loss of air, The allowable
loss of air shall be less than the leakage values when tested in accordance with 5.3.7.1
4.4 Constructional characteristics
4.4.1 External appearance
The external surfaces of the brake indicator shall be free of sharp edges which could be a danger to those persons handling the brake indicator or to other equipment in the proximity of the brake indicator. This requirement shall be checked while testing the other constructional features in accordance with 5,3.2.
The test is made using a dust chamber incorpoating the basic principles shown in Figure 2 of EN 60529:1991 whereby the powder circulation pump may be replaced by other means suitable to maintain the talcum powder in suspension ii a dosed chamber. The talcum powder used shall be able to pass through a square-meshed sieve the nominal wire diameter of which is 50 pm and the nominal width between wires 75 pm The amount of tatcum powder to be used is 2 kg per cubic metre of the test chamber vo4ume.
NOTE health and salety regulations should be observed In satecting the type of talcain powder and its use.
Category 2 enclosure: The enclosure under test is supported in its normal operating position inside the test chamber Any drain-hole normally open shall be left open for the duration of the test. The test shall be continued for a period of 8 h.
5.3,4,1.2 Passlfail criteria
The protection is Satisfactory if, on inspection, talcum powder has not accumulated in a quantity or location such that, as with any other kind of dust, It could interfere with the correct operation of the equipment or impair safely, when tested In accordance wIth 5.3.8 at 20 C. Except for special cases to be dearly specified in the re4evant product standard, no dust shall deposit where It could lead to tracking along the electncal creepage distances.
5.3.4.2 Water test
5.3.4.2.1 Procedure
The test is made by spraying the enclosure from all practicable directions with a stream of water from a stantlard test nozzle as shown in Figure 1
The conditions to be observed are as follows:
— internal diameter ol the nozzle: 6,3 mm:
— delivery rate: 12,5 1/mm ± 5%;
— water pressure: to be adjusted to achieve the specified dativery rate:
core of the substantial stream: circle of approximately 40 mm diameter at 2,5 m distance from nozzle:
— test duration per square metre of enclosure surface area likely to be sprayed: I mm;
— minimum test duration: 3 mm;
— distance from nozzle to enclosure surface: between 2,5 rn and 3 m.
