Repair Procedure for Roof Leakage in LHB AC coaches

Repair Procedure for Roof Leakage in LHB AC coaches. 

ANNEXURE - 1

Procedure for FRP trough Roof Leakage in LHB AC coaches-testing & repair 

1) Drain outlet of FRP trough to be cleaned from (outside) end wall side to clear any blockage due to dry leaves, dirt, garbage and sediments. 

2) Visual inspection of RMPU bellows of return air & conditioned air, RMPU bellow gaskets, tightness of bolts, if any defects observed it has to be attended. If the duct bellows are found to be damaged, replace the damaged duct bellows. 

DESIGN FEATURES & COACHES OF LHB COACH SHELL

 DESIGN FEATURES OF LHB COACH SHELL 

FIAT BOGIE IN LHB COACH

 3.4 FIAT BOGIE. 

The LHB coaches are provided with the FIAT bogies to run at a speed of 160 KMPH. 

Limitations of ICF all Coil Bogie 

• The longitudinal and lateral movements of the wheels cannot be controlled independently as generally required for Highspeed bogies. 
• Since there is vertical space constraint between the top and bottom bolster, it is not possible to provide softer secondary suspension springs which are required for the high speed trains to control the dynamic movements of the bogie bolster and coach body. 
• Headstocks increase the yaw inertia of the bogie frame and thereby, influence the tendency for hunting. The wheelbase of ICF all coil bogie is 2896 mm. This large wheelbase affects curve negotiations and thereby increases wheel flange wear. 131 
• Since the brake forces are offered on the wheel tread by clasp brake, it could not give sufficient retardation during brake application which in turn increases the emergency braking distances. The life of the wheel is also reduced due to tread wear. 

Wheel and Axles Of LHB Coach

 Wheel and Axles 

• Two brake disks (4), diameter 640 mm and width 110 mm. 
• Two wheel disc of tread dia 915 (New), 845 (worn) 

• Dynamic balancing 320rpm 
• Less that/equal to 50gm.m 

SAFETY RELATED PROVISIONS & ADVANTAGE OF LHB COACHES

 Safety Related Provisions

1. Four emergency exit windows for faster passenger evacuation during emergencies.

2. Wider vestibule designs for smooth inter coach movement with luggage.

3. Convenient to operate emergency alarm pull operation and Fire - retardant furnishing controls the spreading of fire and prevents higher damages.

Air Brake Testing Procedure for LHB Coaches

 Air Brake Testing Procedure for LHB Coaches: 

On arrival of the rake on pit line, completely drain the AR tank (125 litres & 75 litres) of all the coaches by opening the drain cock, to remove the water in air. 

Initially, couple the BP hose of the test rig with the BP hose of the rake & then charge the BP pressure to 5.0 kg/cm2 . Keep the FP angle cock of both end power cars in close position. Check the FP gauge fitted in the power car, if the gauge does not show any pressure, the NRV of all the coaches are ok. If, FP gauge shows any pressure, the NRV of some coach in the rake is defective. In this condition, check the rake for NRV defective by taking the coaches in parts. NRV found defective in particular coach should be replaced. 

Salient Features LHB – Coaches

Salient Features of LHB – Coaches

Important features of LHB coaches which make them superior to existing ICF design coaches are summarized below. 

i. Coach Body - LHB coach is light weight construction made from low corrosive stainless steel. The weight of the coach is about 10 percent less as compared to the conventional coach resulting into lower haulage cost. Each vehicle is equipped with complete pantry to store hot meals and cold beverages except LWLRRM, LWFAC, SCN, GS etc. The modular construction and the integration of lights into interior ceiling and luggage racks are characteristics features of modern interior design. Windows are specious and modern equipment have been provided which make the coach far superior esthetically. 

LHB – COACHES

LHB – COACHES 

Introduction to LHB Coaches 

(Linke Hoffmann Busch GMBH – German) 

Indian railways have been manufacturing passenger coaches of “Schlirien” design for more than 50 years. Although continuous efforts were being put to upgrade these coaches, due to constraints/limitations in the design, we could not cope up with quality and speed of the Railway transport in the developed countries.

It was felt to imbibe technology in-use, in the developed countries so as to affect a quantum jump in quality and speed of Railway coaches.

“M/s Alstom and Linke Holfmann Busch (LHB)” are one of the leading manufacturers in transport sector having presence in most of the European countries. Coaches manufactured by them are running in many countries across the world. 

LHB coach body is designed and manufactured by leading German company Linke Holfmann Busch GMBH and Bogies for these coaches is designed and made by M/s FIAT, Switzerland which is now a part of Alstom group. Indian Railways entered into a TOT agreement with M/s. Alstom Germany for manufacture of LHB type of Coaches. Accordingly, their inception and mass production in Railways started in 2002 and population is growing day by day. 

LHB COACHES - BENEFITS TO RAILWAYS & PASSENGER

Salient Features LHB – Coaches

SAFETY RELATED PROVISIONS & ADVANTAGE OF LHB COACHES

3.2 SALIENT FEATURES OF LHB COACHES 

These coaches are longer by 1.7 meters than the ICF coaches and hence more number of passengers can be accommodated in a given coach. As the length of the coach is longer the number of coaches required to form a formation is reduced and hence overall cost of maintenance becomes less. 

These coaches are fitted with Axle Mounted Disc brakes to have an effective brake power to stop the train within the short braking distance. As the brake forces are acting on the Discs which are mounted on the Axles, the wear on the wheel tread caused due to brake application on tread is eliminated and hence the life of the wheels are considerably increased. 

These coaches are fitted with Wheel slide protection device to prevent the wheel from getting skid. Due to various reasons it is possible for any one of the wheel to have lesser speed when compared to the other three wheels and in such a case it releases the air from the brake cylinder of the affected wheel automatically to prevent the wheels from getting skid. 

These coaches are fitted with Brake accelerator in the Brake pipe to bring BP pressure to zero during emergency brake application. The brake accelerator connects the Brake pipe with exhaust during emergency application to facilitate faster exhaust of air from the brake pipe. 

These coaches are provided with FIAT bogies, which are designed to run at a speed of 160 KMPH. The wheelbase of Bogie is 2560 mm. 

These coaches are fitted with earthing device to prevent damages to the Roller bearings. These coaches are fitted with roof mounted AC package units. 

These coaches are fitted with Controlled discharge Toilet system designed to discharge the human waste when the speed 125 reaches above 30 KMPH. The objective of this toilet system is to keep the station premises clean and hygienic. 

These are fitted with tight lock AAR centre buffer coupler with anti-climbing feature to prevent the climbing of one coach over another in case of accidents. 

The following equipments are operated by Microprocessor controlled system 

• Wheel slide protection device. 
• Controlled discharge toilet system. 
• Water pumping device. 
• Roof mounted AC package units 

The riding index of LHB coach is 2.75 when compared to 3.25 in case of ICF Coaches. 

Up-graded design for passenger safety/comfort like; Ergonomically designed seats as per Indian anthropometrics data, 126 Large windows with good visibility, Luggage racks with in-built reading lamps, Insulation against noise, No visible screws in the interior. Use of fire retardant materials, Hand – safe feature in all automatic sliding doors, Anti – skid PVC flooring, UIC vestibules and auto - closing vestibule door. 

Functionally designed pantry area is easily accessible AC unit controls. The passenger emergency alarms signal devices (emergency alarm pull box) are provided inside passenger compartment. This is to avoid operation of PEASD by unauthorized persons from outside. There is no mechanical linkage like a chain and this handle directly operates the PEA valve for venting the brake pipe pressure. 

DESIGN FEATURES & COACH SHOF LHB COACHESELL 

FIAT BOGIE IN LHB COACH

Wheel and Axles of LHB Coaches