FIBAFAILURE INDICATION CUM BRAKE APPLICATION
Need of FIBA
There may be possibilities that during the normal running of the coach at high
speed that one of the bellows may rupture due to various reasons such as a track
side ballast hit or a cattle or animal run over leading to extensive damage to
under-frame mounted equipment including the bellows.
When a bellow ruptures suddenly, the coach may tilt to the side of ruptured
bellow leading to an imbalance in the coach itself.
However, travelling at high speed say at High Speed with a coach tilted towards
one side is a dangerous condition considering the passenger safety and should be
brought to the notice of Loco pilot for him to take appropriate precaution during
the remaining journey.
Since entire air suspension system is purely pneumatic there is no means to send
a signal to the driver who sits in the locomotive other than heavy leakage in Feed
pipe.
Safety device is provided in the system over-come such dangerous tilt to one
corner.3
17
Hence a need is felt to actuate an automatic service brake application in the train
so that the driver will get down to investigate the cause of such service braking
which has not been initiated by him.
There should also be a system to identify the defective coach carrying the
defective bellows by means of an audio and visual indication to facilitate easy
location of the defective equipment.
Once the defect is located the Loco Pilot will have the facility to isolate the
defective equipment by closing the supply of compressed air to AIR
SPRING/defective equipment and also to manually reset the service brake so
that the train journey can be resumed preferably at a CAUTIOUS SPEED.
WORKING PRINCIPLE
PRESSSURE DIFFERENTIAL SYSTEM
System consist of a valve to sense the pressure of compressed air in each bellow
of the bogie constantly and initiate normal brake application. When the
difference in pressure between the bellows in that bogie becomes more than
2.8+/-0.1 kg/sq.cm. FIBA should drop the BP pressure to apply brake in
complete train and should provide whistling sound as well as red indication
through indicator with FIBA device.
ABSOLUTE PRESSURE SYSTEM
System consist of a valve to sense the pressure of compressed air in each bellow
of the bogie constantly and initiate normal brake application when the pressure
of any or both air spring bellows of concerned bogie dropped to
1±0.1 kg/sq
cm
. FIBA should drop the BP pressure to apply brake in complete train and
should provide whistling sound as well as red indication through indicator with
FIBA device.
DUAL PRESSURE SYSTEM
System follow both Pressure Differential system as well as Absolute pressure
system. In loaded condition it follows Pressure Differential System whereas in
tare condition it follow Absolute Pressure System. The system consist of valve to
sense the pressure of compressed air in each bellow of the bogie constantly as
well as differential pressure between both bellows of concerned bogie.
Normal brake application is initiated whenever pressure in any or both air
spring bellows of concerned bogie dropped to 1(±0.1) kg/sq. cm whenever the
pressure difference between both air spring bellows becomes more than 2.8 ±0.1
kg/sq cm. due to bellow burst or spring failure, FIBA should drop the BP 3
18
pressure to apply brake in complete train and should provide whistling sound as
well as red indication through indicator with FIBA device.
Note: At Present all make FIBA is working on Absolute Pressure
system.
Salient Features of FIBA (Faively/Knorr/Escortmake)
Purely pneumatically operated.
Works well in graduated release air brake system.
Will Initiate light brake application in the train when a bellow in any coach
ruptures. (Brake Pipe is getting vented through the bore of Diameter 8 mm).
The equipment design to consist of sensor valves to sense the pressure of
compressed air in each bellow of the bogie on continuous basis and initiate
dropping of brake pipe pressure in case pressure in any or both air spring bellow
of the concern bogies drops below 1 ±0.1 Kg/cm2 it will result in application of
brake in the train and ultimate stopping of the train.
Provides hissing sound and visual signals at the defective bogie.
Manual Resetting of FIBA is possible to resume journey. Resetting
of audio and visual indications also is possible.
Weight of FIBA device with cover should not exceeded 16 kg approx.
Each pair of bellows in one bogie of the coach monitored by one Failure
Indication cum brake application device (FIBA) and audio/visual equipment.
The audio indication is through a hissing sound level not to panic the passengers
(90 ±5 Db).
Visual indication is through single brake indicators, one fixed on each side of the
bogie, which change colour from Green to Red when actuated.
Retrofit also possible with least modification in piping in any coach already fitted
with Air Spring system.
Equipment designed for a compact mounting facility with a pipe and mounting
bracket.
Warranty
- 60 Month from date of fitment or 72 month from date of
manufacturing whichever is earlier.3
Probable causes of FIBA operating
Busting of Rubber Bellow, Improper seating of rubber bellow.
Spring height not adjusted as per recommended value (294+0
-5
mm)
Busting of Rubber Hose pipe.
Leakage in Leveling Valve due to malfunction of valve or level of horizontal
lever not adjusted properly.
Leakage in Metal Air pipeline between air spring and FIBA unit.
FIBA Valve Malfunction.
Non charging of Air Springs. (single pipe working)
Trouble Shooting & Resetting of FIBA
•
Condition 1. Air spring rupture/air hose pipe/metal
pipe leakage.
•
After locating the ruptured bellow,
A. Isolate FP cock between 150 Ltr AR pipe & leveling Valve.
B. Isolate BP cock between BP pipe & FIBA.
C. Reset the FIBA indicator as below in case.
1. Knorr- Rotate the switch in anti-clock wise to reset.
2. Faively- After closing the isolating cock of BP pipe it will reset
automatically.
3. Escort – Pull the rings left and right or vice versa and then pull the
middle ring to reset.
• Indicator will turn from RED to GREEN.
After resetting the FIBA, train may be allowed with restricted speed @ 60
kmph
•
In case of Rubber hose pipe leakages, attend it by replacing the defective hose
(allow the train with max speed upto destination).
•
If it is not possible to attend, than follow the above procedure to isolate the air
spring and give message to next station for attention (after attention allow the
train with max speed upto destination).
•
Condition 2. Malfunctioning of FIBA
•
Confirm rubber bellows working,
A. Isolate BP cock between BP pipe & FIBA.
B. Isolate both cocks between Air spring & FIBA.
C. Reset the FIBA indicator as below in case.
1. Knorr- Rotate the switch in anti-clock wise to reset.
2. Faively- After closing the isolating cock of BP pipe it will reset
automatically.
3. Escort – Pull the rings left and right or vice versa and then pull the
middle ring to reset.
• Indicator will turn from RED to GREEN.
• After resetting the FIBA, train will be allowed3
23
•
Condition 3. Testing of FIBA working.
•
During Trip schedule maintenance C&W staff
should test the working of FIBA device.
A. Isolate any one or both cocks between Air spring & FIBA. FIBA should
operate and brake applied.
B. Open the isolated cock and reset the FIBA.
C. Reset the FIBA indicator as below in case.
1. Knorr- Rotate the switch in anti-clock wise to reset.
2. Faively- After closing the isolating cock of BP pipe it will reset
automatically.
3. Escort – Pull the rings left and right or vice versa and then pull the
middle ring to reset.
• Indicator will turn from RED to GREEN.
Instruction to be followed during the routine testing of
the coach fitted with FIBA device
Testing of FIBA device with SWTR RTR
Sr.
No Description of Test Specified Test Stand Setup -
Connect tine SCTR/RTR to the coach to be tested fitted with FIBA Device.
Charge the brakes system and Air spring suspension system.
1 Independent Brake Application
1.1
Apply service brake on the coach. Check the hissing sound, indication
at the side of the coach and the drop in BR pressure.
2 FIBA Device Actuation
2.1 Open the drain cock of any 60 liters reservoir of Air suspension con
trol equipment to create rapid venting of air from the bellow to which
the reservoir is connected. Check that the brake application take
place, indicators connected to that bogie turn from green to red &
hissing sound is heard.
Brake application take place.
Red Indication & hissing
sound occurs.
2.2 Check the brake indicators connected to the other bogie and observe
the hissing sound from the equipment on the other bogie.
Green Indication & no hissing
sound occurs.
2.3 Close the drain cock of the 60 liters reservoir and let the air suspen
sion control system to recharge fully. The brakes remained applied;
indicators remain RED and hissing sound is continued.
Brake are applied/hissing
sound/Red Indication
2.4 Close the isolating cock for reset to FIBA device.
Brake are released/No hissing
sound/Green Indication
2.5 Open the drain cock of any 60 liters reservoir of Air suspension con
trol equipment on the other bogie to create rapid venting of air from
the bellow to which the reservoir is connected. Check that the brake
application take place, indicators connected to that bogie turn from
green to red & hissing sound.
Brake application take place.
Red Indication & hissing
sound occurs.
2.6 Check the brake indicators connected to the first bogie and observe
the hissing sound from the equipment on that bogie.
Green Indication & no hissing
sound occurs.
2.7 Close the drain cock of the 60 liters reservoir and let the air suspen
sion control system to recharge fully. The brakes remained applied;
indicators remain RED and hissing sound is continued.
Brake are applied/hissing
sound / Red Indication
2.3 Close the isolating cock for reset to FIBA device.
Brake are released/no hissingsound/Green Indication
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Instructions for Speed restriction for breakage of coil spring or deflated air springin en-route in coaching train.
Sr.
No. Coach Type Spring Type and Suspension Observation Photos Action To be taken Speed Restriction Reference
1 Hybrid Coach & LHB Coach Air Spring/
Secondary
Heavy
leakage or
deflated
air spring
In case of heavy leakage or deflated air spring the
defective bogie is to be isolated with the help of
isolating valves and driver should observe a speed
restriction of 60kmph upto terminal point for
maintenance.
Max.
Permissible
Speed = 60
kmph
Pamphlet issued
by CAMTECH
DG/Carr./RDS
O’s letter no.
MC/CB/MN,
dated 09.09.2009
If there is any Hose pipe leakage the same should be attended and train to run at booked speed. If Air Spring and hose pipe and all other things are OK and only FIBA malfunctioning,
FIBA should be isolated and train to run at booked speed.
2
LHB
Coach
Secondary
outer Flexi
Coil
Spring/
Secondary
Breakage
of
secondary
outer flexi
coil
spring/
Secondary
Coach can be permitted to run with a restricted speed
of 90 kmph upto the destination with TXR staff to
escort the train and critically monitor the broken
spring the following should be ensured while
permitting such movement:
Only one spring is in broken condition
The spring is broken at one location which falls top
or bottom 2 coils
The spring is not displaced from its position
Bump stop gap should not be zero
Max.
Permissible
Speed = 90
kmph
With TXR
staff to
escort the
train.
ED (Stds) /
Carriage’s letter
no. SV.FIAT
Spring dated
05.02.2015
3
LHB
Coach
Primary
outer
Spring/
Primary
Breaking
of
Primary
Outer
Spring
LHB Coach can be permitted to run up to destination
with escorting TXR staff at restricted speed of 80kmph,
provided the following condition:
Only one primary outer spring is broken
The spring is broken at location which falls within 1.5
coil length from top/bottom end. No oil leakage or
physical damage to primary vertical damper. Control
arm lug should not have any marks of hitting with
the head bracket.
The broken spring is not displaced from its position.
Coach to be escorted up to destination with TXR
Staff.
Max.
Permissible
Speed = 80
kmph
With TXR
staff to
escort the
train.
ED (Stds) /
Carriage’s letter
no. SV.F
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