Udaan: Quality Circle Welcomes You All
Udaan: Quality Circle Welcomes You All
Udaan: Quality Circle Welcomes You All
Udaan
Quality Circle
Welcomes You All
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UNCHAHAR
CASE STUDY
FREQUENT TRIPPING OF VACCUM PUMPS
IN ASH HANDLING STAGE-IV
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UNCHAHAR
Thermal - 5*210 + 1*500 = 1550 MW
Solar - 10 MW
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UNCHAHAR
Registration No. 45
Attendance 90 %
INTRODUCTION OF TEAM
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UNCHAHAR
IDENTIFICATION OF PROBLEMS
Through Brain Storming
S. N. PROBLEMS CATG.
1 Drain line choking below settling tank and surge tank in Ash handling Stage-III. A
3 No auto running problem of drain sump pump in Stage – III slurry pump house. A
7 Frequent problem of low APH header vacuum and shutoff vacuum in Stage– III. A
9 Frequent valve limit disturbance problem of suction and discharge of series pump in Stage – III. B
11 Limit disturbance problem of upper and lower dump valve of buffer hopper in Stage-III B
12 Drinking water problem in bottom and APH hopper area Stage-III. A/K
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UNCHAHAR
IDENTIFICATION OF PROBLEMS
Through Brain Storming
S. N. PROBLEMS CATG.
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UNCHAHAR
IDENTIFICATION OF PROBLEMS
Categorization of problems
A/K- Type 02 08 10
B- Type 01 00 06
Total 03 08 16
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UNCHAHAR
SELECTION OF PROBLEM
P-1 Frequent gland leakage problem of slurry series pumps in Stage – III.
P-3 Limit disturbance problem of upper and lower dump valve of buffer hopper in Stage-III
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UNCHAHAR
SELECTION OF PROBLEM
Urgency
Environment
Frequency
Generation
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UNCHAHAR
SELECTION OF PROBLEM
Urgency Environment
Members
P1 P2 P3 P1 P2 P3
M. K. Gupta 6 8 4 5 8 7
Rajesh Kumar
5 7 6 6 6 7
A. K. Singh 7 6 6 7 8 6
Total 18 21 16 18 22 20
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UNCHAHAR
SELECTION OF PROBLEM
Frequency Generation
Members
P1 P2 P3 P1 P2 P3
M. K. Gupta 7 7 6 6 7 6
Rajesh Kumar 6 6 6 7 6 6
A. K. Singh 5 7 7 5 6 7
Total 18 20 19 18 19 19
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UNCHAHAR
SELECTION OF PROBLEM
P1 18 18 18 18 72 III
P2 21 22 20 19 82 I
P3 16 20 19 19 74 II
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UNCHAHAR
SELECTION OF PROBLEM
Selected Problem
Frequent tripping
of Vacuum pumps in AshHandling Stage-IV
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UNCHAHAR
SELECTION OF PROBLEM
Planning milestone chart
Utthan Quality Circle Dept -Operation (C) Facilitator-Sh. Nitin Pal
Dy. Facilitator – Sh. Siddharth Sonker
Problem: Frequent tripping of Selection Basis – Priority / Plan M K Gupta - Leader
Vacuum pumps in Ash Handling Rating Method Rajesh Kumar - Dy. Leader
Stage-IV
A K Singh - Member
Identification of causes
Data analysis
Developing Solution
Trial implement/Check
performance
Regular implementation
Follow up/Review
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UNCHAHAR
DEFINE THE PROBLEM
Problem Area
Problem Area
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UNCHAHAR
DEFINE THE PROBLEM
Flow Diagram
ESP Collecting
Plate Problem area
Hoppers
Truck Ash
Loading Dyke
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UNCHAHAR
DEFINE THE PROBLEM
OFF
TAKE PIT
ASH FAHP
PROBLEM AREA
WATER
TANK
WETTING
UNIT
VACUU
WET- M
PUMP
MODE ESP
DEASHING HOPPER
S
SYSTEM ASHSLURR
Y PIT
ASH
DYK
E
ASH SLURRY
SERIES
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UNCHAHAR
DEFINE THE PROBLEM
Impact of Problem
Hopper poking
manually due to Deashingtime
deashing disturbance increasing
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UNCHAHAR
DEFINE THE PROBLEM
Availability of AHP
System
Healthy Environment
Decrease
Maintenance System
Reliability
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UNCHAHAR
DEFINE THE PROBLEM
Set Goal
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UNCHAHAR
ANALYSIS OF THE PROBLEM
Data Collection
Vacuum Pump tripping frequency in ESP :---
Source: Permit book , Shift O&M log Time Duration: 16 Nov 2018 To 15 Feb 2019
book.
IV 15 17 18 17 67
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UNCHAHAR
ANALYSIS OF THE PROBLEM
Data Collection – Loss Calculation
Total
No. Of
Description Quantity/day Rate Calculation Amou
days
nt (Rs.)
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UNCHAHAR
IDENTIFICATION OF CAUSES
Through Brain Storming
Over current
Bearing temperature high
High Vibration
Inadequate seal water pressure
Carryover
Open to air
Pump belt is loose
Under greasing
Poor maintenance
Over running
Vacuum line choking
Vacuum line gasket damage
Pump developing inadequate vacuum
Foreign material stuck-up
High header vacuum
Manual mistake in selection
Valve limit malfunction
MCC disturbance
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UNCHAHAR
IDENTIFICATION OF CAUSES
Fishbone Diagram
MAN MACHINE
Foreign mat. stuck up
No proper training Manpower shortage Pressure more than
Excess workload Carryover design Seal water line damage
Lack of knowledge Tiredness
Inadequate seal water pressure Seal water pressure dropped
Lack of experience
Lack awareness Over greasing Pressure from source dropped
Lack of Bearing temperature high
dedication Misalignment
Lack of concentration Lack of process information Under greasing
Bearing jamming High Vibration
Frequent change
No availability
of senior of staff
Over current
Frequent
persons Bearing clearance
MATERIAL METHOD
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UNCHAHAR
FINDING OUT THE ROOT CAUSES
Identification by Validation
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UNCHAHAR
FINDING OUT THE ROOT CAUSES
Identification by Validation
15 Scheduled changeover not followed Found Wear & Tear In pump Rare
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UNCHAHAR
DATA ANALYSIS
Duration:- 16 January 2019 To 15 Feb 2019
Various Root
S.N. Causes Frequency Cumulative No. Total % Cumulative %
Poor Maintenance
3. 04 24 15.38 92.4
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UNCHAHAR
DATA ANALYSIS
Pareto Diagram
30 120
20 76.92 80
Frequency
Cumulative %
57.69
15 60
10 40
5 20
0 0
Inadequate seal Foreign mat. Poor Poor quality of
water pressure Stuck up Maintenance belt
Root Causes
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UNCHAHAR
DEVELOPING SOLUTION
Suggestion No. 1 : Replace the service water pump with high discharge.
pump.
Reason :This suggestion was rejected by the group because this
pump was already as per design pressure.
te d
ec
Rej
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UNCHAHAR
DEVELOPING SOLUTION
Suggestion No.2 : Reduce the diameter of seal water pipe for increasing
pressure.
Reason : This suggestion was rejected by the group because it is
too costly & time taking.
te d
ec
Rej
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UNCHAHAR
DEVELOPING SOLUTION
Suggestion no.3 : Installation of orifice in seal water line before vacuum pump.
Reason
: This suggestion was accepted by the group as It was easy to install in
the seal water line & not too costly.
40 NB
pted
Ac ce
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UNCHAHAR
DEVELOPING SOLUTION
Selected Solution
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UNCHAHAR
FORESEEING PROBABLE
RESISTANCE
1 Whether new changes would be permitted or not ? We will convince the Head of the
Department of Maintenance with the help
of site engineer.
2 How could we make it ? We will take the help of our Ash Handling
Maintenance group.
3 Could it be done in running of the vacuum pump ? No. It could be done only when the vacuum
pump will be off and under PTW.
4 Would there be any resistance from our No. Standby vacuum pumps will be taken
Operation group? in service.
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TRIAL IMPLEMENTATION & CHECK UNCHAHAR
PERFORMANCE
ACT
PLAN
• Taken permit for
Planned to install the orifice first
regular in vacuum pump – A1
Implementation. After permission following things
collected -
•Plan is to be done for
• Ms flange joints
other vacuum pumps.
• Nuts and bolts.
•Collection of • Orifice of ID – 12 mm
data and performance • Welding rods & machine
• Presentation
CHECK DO
• Cut the pipe into 2 parts
• Checked the leakages in seal water
• Welding of flange joints at
line.
both ends.
• Checked the seal water pressure
• Place the orifice between
in pressure gauge.
flange.
• Checked the seal water permissive
• Fastening of nuts & bolts in
in OWS.
flange joints.
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TRIAL IMPLEMENTATION & CHECK UNCHAHAR
PERFORMANCE
Installed
Orifice &
Flange
joints
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UNCHAHAR
TRIAL IMPLEMENTATION & CHECK PERFORMANCE
Data Comparison
Data Source : Log Book and PTW Register
Data Collected By — Sri M. K. Gupta
Description
Duration Duration:
: 16 Jan.
26
2018 to 15
Feb. 2019 16 Feb.
2019 to 18
Mar. 2019
3. Poor Maintenance 04 01
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UNCHAHAR
REGULAR IMPLEMENTATION
Project Cost
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REGULAR IMPLEMENTATION
Total Loss Before Project
Total
No. Of
Description Quantity/day Rate Calculation Amou
days
nt (Rs.)
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UNCHAHAR
REGULAR IMPLEMENTATION
Total Loss After Project
Total
No. Of
Description Quantity/day Rate Calculation Amou
days
nt (Rs.)
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UNCHAHAR
REGULAR IMPLEMENTATION
Tangible Benefits
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UNCHAHAR
REGULAR IMPLEMENTATION
Intangible Benefits
Increased safety of
working person .
Increased System
continuity & reliability
Reduced MCC
disturbance
Increased self
confidence & moral
of QC members.
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UNCHAHAR
FOLLOW UP & REVIEW
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UNCHAHAR
TOOLS & TECHNIQUES USED
• Flow Diagram
• Brain Storming
• PDCA Cycle
• Data Collection &
Stratification
• Pareto Diagram
• Fishbone Diagram
• Milestone Chart
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UNCHAHAR
OUR PROJECT
Drain line choking below settling tank and surge tank in Ash handling Stage-III
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UNCHAHAR
ANY SUGGETION PLEASE
THANKS.
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