BS EN 15220-1:2009 pdf download – Railway applications — Brake indicators Part 1: Pneumatically operated brake indicators
The brake indicator shall be able to function:
4.2.1 When the upper pressure limit of the compressed air used is 10 bar. It shall be able to withstand a hydraulic test with a pressure of 15 bar in accordance with 5.3.3.
4.2.2 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 carried out in accordance with 220.127.116.11.
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 18.104.22.168 and 22.214.171.124.
4.2.4 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 can be necessary to use protection class IP 65 for indicators fitted with electrical components.
4.2.5 To withstand the external corrosion due to normal atmospheric pollutants as specified in EN 50125-1, the brake indicator shall be tested in accordance with the test shown in 5.3.12. 4.2.6 The brake indicator shall be able to function in the vibration environment, 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 Braking/release status The operating conditions of the braking/release 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 possible to operate the brake indicator 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 126.96.36.199
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.
4.4.2 Fire/smoke behaviour Non-metallic housings and components shall be made of self-extinguishing materials and shall comply with the requirements as defined in 5.3.13. Where any specific requirements for the brake indicator for particular lines or train services have been agreed between supplier and purchaser, they shall be tested in accordance with 5.3.13.
4.4.3 Connections The body of the brake indicator shall have an internal G ¼” thread for connection(s) according to EN ISO 228-2 to the brake cylinder pipe(s). If required by the purchaser, the body can have an electric connector(s). This requirement shall be checked while testing the other constructional features in accordance with 5.3.2.
4.4.4 Electric contacts The contacts shall have “snap action operation” and be capable of operating within voltage limits of 0,7 U n and 1,25 U n. NOTE Contact characteristics (voltage, current, protection etc.) and cabling will be declared by the supplier.
4.4.5 Space envelope The brake indicator shall be contained in the space envelope of Figure A.1, A.2, A.3, A.4 and A.5. Sizes shall be checked in accordance with 5.3.2.
4.4.6 Indicator window The brake indicator shall have a window not less than 2 400 mm 2 for viewing:
red flag: in the middle this flag shall have a black line 10 mm wide or a black dot 15 mm diameter;
green flag. NOTE White flag with black cross may be used to indicate uncertain braking status of a parking brake by physically operating in front of the red/green indicator window.