C-122 sould be C-120 . The V Belt enigma.

While analysing increasing V belt failures, a shocking fact was revealed.V belts are oversized !! We achieve not less than 30 mm deflection upon application of 4 kg with 295 mm long new BTM on new belts !!
Another make tried, same results. That means drawing no SKEL 3940 is wrong. Or belt length of 3150 mm is more than required !So, we cant give prescribed tension even with everything proper. And inadequate tension means belt slippling and consequent failures.
16 mm defection comes on 4 kg when the spring is only 230 mm . Thats as good as no spring.

New LHB Shatabdi Rake Inaugurated.

On 15t August, new rake of LHB shatabdi was flagged off from BCT. While commissioning, it was found that in two coaches thermal isulation was missing.Many issues- some sorted out, some still pending. The rake is , many times better than the previous Non -LHB shatabdi.

Scroll Compressor Inside Out.

Why does scroll compressor fail in LHB coaches so much ? We did a tear down analysis of the same.

Please dont abuse pantry equipments

Howsoever hard electrical department tries to maintain all pantry and mini-pantry equipments in order, we can't have a 100% effeciency unless users of these equipments stop abusing them. This is an appeal.

Measuring and Monitoring Relay (MMR)

The MMR is very critical protection device in view of no overcurrent protection of the RMPU motors which get burnt on single phase faults. The ideal test bench should have:-
1.Facility to apply varying voltage to test the relay.
2.Indications onpanel to show status of NO NC contacts.
3.User friendly features.

Required- Design modification in LHB coaches 750 V junction box

Electrical Staff Maintaining Shatabdi Express

Electrical Safety Week-2009

Scroll Compressor failures

Some obseravtions regarding Scroll compressors:-

1.They were provided to replace the reciprocating Bristol compressors which had high failure rates.
2.Even scroll compressors in 2003-04 LHB coaches are having FRPCPY of over 20.
3.Howrah division has pretty less FRPCPY since their coaches are new.
4.Coaches of 07 and 08 series have had less failures in Mumbai Divsion.
5.Scroll compressors when fitted in SGAC coaches are found to work well.
6.None of the scroll lasts the life of 8 years. They fail in first three years of years.
7.Failures are comparitevy less reported in NR and ER.

Now the question is why they fail so much :-
Some contributing factors are:-
1.Bypassing of LP switches in order to "push" cooling.
2.Choking in the 'solenoid' which is redundant in the system.
3.Bypassing of sensors after failing of sensors.
4.Choking of Dryer.
5.Leakage of oil from capillary, and no provision of top up.
6.Overcharging of gas (it requires not > 3kg for LEEL and 3.5 kg for Sidwal RMPUs)

Pre Summer Drive launched and completed .

How we can live upto the expectations of our customers

A tired pasenger enters a train after all the tiresome road journey he took to reach the station. He sighs with relief as he enters the pre-cooled coach from the ambient 40 degrees. He is further pleased to find a clean coach with all the bright illumination and silent but effective fans inside the coach. The coach attendent greets him to his delight and offers fresh linen. The passenger is assured by the coach attendant that he will be woken up at the desired station by him. The passenger is snoring now into a sound sleep. The sleep that he needs, the sleep he might remeber his best ever.
Are we doing this? Where we need to fine tune ? Lets think, and make the coaches of Mumbai division of Western Railway a the most pleasant ones.