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7 Cards in this Set
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- Back
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What is the procedure to test the No4 brake equipment? |
The loco handbrake must be on. Check the main reservoir is showing between 750-850 KPA indicating the air compressor Governor is operating and set correctly. The needles on the flowmeter are close together. The driver must: - Place to self lapping brake valve to the RELEASE position - Open the automatic brake valve isolating cock - place the automatic brake valve to the RUNNING position - Ensure that the equalising reservoir and brake pipe registers 500 KPA and the brake cylinder pressure is zero - Ensure the brake cylinder warning light extinguishes SERVICE POSITION Reduce the equalising reservoir pressure to 465KPA and return the brake handle to LAP. Take 35KPA out of brake pipe The driver must ensure: - Equalising reservoir pressure falls to approximately 465KPA - brake pipe pressure falls to approximately 465KPA - Brake cylinder pressure rises - The brake cylinder warning light illuminates The driver will then make a further application reducing equalising reservoir pressure to 350 KPA and return handle to LAP. Equalizing Application LAP POSITION over a period of one minute: - brake pipe pressure must not fall in excess of 35KPA or rise in excess of 18 KPA - brake cylinder pressure must not leak in excess of 35KPA EMERGENCY POSITION - brake pipe pressure will fall to zero CHARGING AND RELEASE POSITION -The driver now places the automatic brake valve handle into the CHARGING and RELEASE for one second-so it doesn’t over charge! It is then placed into the running position where: - brake cylinder pressure will fall to zero - Brake pipe pressure will rise to 500 KPA - Equalising reservoir pressure rises to 500 KPA indicating that the feed valve is functioning and set correctly - The brake cylinder warning light will extinguish HAND RELEASE VALVE (ind brake) To test the hand release valve the driver must make a 100 KPA reduction in the brake pipe using automatic brake handle. The driver will then depress the hand release valve and note that brake cylinder pressure falls to zero. Self Lapping Brake Valve Test Application Zone- brake cylinder rises to 150kPa-pause and check pressure is maintained Full Application - brake cylinder pressure rises to 310kPa Emergency- ensure brake cylinder pressure rises to 375KPA AND safety valve is heard venting off excess pressure Release-ensure brake cylinder pressure falls to zero |
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When are brake valve tests conducted? |
The automatic brake valve and related brake equipment must be tested every time the locomotive enters service and whenever a brake fault is detected or suspected. |
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What is the allowable leakage rate for the rotary valve? |
Over a period of one minute: - Brake pipe pressure must not fall in excess of 35KPA or rise in excess of 18KPA. - Brake cylinder pressure must not leak in excess of 35KPA. |
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What is the procedure if the rotary valve leaks at locomotive Depot? |
The driver must test the brake valve and any faults must be reported to maintenance staff via the train controller. |
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What is the procedure if the rotary valve leaks in running? |
The train may continue in running however the following procedure must be adopted to operate the brake: - Before applying the automatic brake close the brake valve isolating cock BVIC then make the required brake application. - Prior to releasing the automatic break open the brake valve isolating cock then place the handle in the CHARGING and RELEASE or RUNNING positions as required. |
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What is the method to test the double check valve? |
Automatic side Place the automatic brake into the RUNNING position then apply the self lapping brake valve. A leaking double check valve will result in a constant flow of air from the triple valve exhaust. This will cease when the self lapping brake is placed in the RELEASE position. If a blow of air persists, there is a defect in the triple valve. Self lapping side Leave the self lapping brake valve in the RELEASE position and apply the automatic brake. If there is a blow of air from the self lapping brake valve exhaust the brake cylinder pressure falls proportional to the leak, then the leak exists on the self lapping side of the double check valve. |
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How do you prepare the locomotive for brake testing? |
The locomotive handbrake must be ON. |
