WMI CRAES LTD., one of the leading manufacturers of Cranes in India, has been pioneers in the manufacture of Material Handling Equipment in the Country. Today WMI`s name is synonymous with heavy lifting. WMI’s equipment can be found in all parts of the Country, helping others get their jobs done faster and easier. An array of WMI cranes have been developed, each crane a creative solution to special handling problem. These cranes are extensively used for handling materials in machine shops, structural shops, chemical plants, fertilizer plants, cement factories, paper plants, stock yards, Dams, and construction sites. All WMI cranes are engineered and built to meet the requirements of all the users. Thus tailor-made for the job, these units handle the loads with utmost ease of maintenance efficiency and economy.
4.2.1.5.1 E. O. T. CRAES
These cranes move on the gantry rail fixed to gantry girder. In this crane 3 common motions are incorporated - hoist, cross travel and long travel. In addition to these common motions some time depending on duty, Aux. Hoist is incorporated. Hoist and C. T. Machineries are fitted on common frame called crab which moves on crane girders.
In refinery, there are two EOT cranes. These cranes play major role in the overall functioning of the refinery whether it be cellhouse, CSM, APM, or ASWM. Even in regular activities other than processes the crane plays a significant role in the refinery. Any delay caused by the crane causes a major delay in all the machineries and the processes.
Some of the major delays occurred in CRANE-1 in NOV-09 TO MARCH-10 are given below:
DELAY AREAS TOTAL
LT 1292
MH 1105
DSL 730
DRIP TRAY 311
HOOK 145
COMPRESSOR 113
REMOTE PAEL 60
CT 40
AH 0
LIK 0
SPREADER BEAM 0
Table 4.7
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4.2.1.5.2 PARETO AALYSIS:
In crane-1 the area which has frequent problem delay is the long travel. Some of the common delays in long travel are as follows:
1. LT got tripped.
2. LT PLC problem.
3. LT slow movement.
4. LT brake problem.
5. LT 2 drives taking delay.
The second area which causes the major delay in crane problems are as follows:
1. MH got tripped.
2. MH not getting down (Due to drip tray 3. MH brake not good.
Third most delay prone area is the DSL. Some common problems occurring in DSL are:
1. Remote signal cut off problem.
2. Whole crane got tripped.
0
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4.2.1.5.2 PARETO AALYSIS:
Fig 4.9
1 the area which has frequent problem delay is the long travel. Some of the common delays in long travel are as follows:
LT 2 drives taking delay.
The second area which causes the major delay in crane-1 is main hoist. Some of the common
MH not getting down (Due to drip tray L/S activated).
Third most delay prone area is the DSL. Some common problems occurring in DSL are:
Remote signal cut off problem.
Whole crane got tripped.
DRIP TRAY HOOK COMPRESSOR REMOTE PANEL CT AH LINK SPREADER BEAM
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1 the area which has frequent problem delay is the long travel. Some of the common
1 is main hoist. Some of the common
Third most delay prone area is the DSL. Some common problems occurring in DSL are:
SPREADER BEAM
Series1 Series2
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The delay problems are also divided among the departments as mechanical, electrical, process, instrumentation and cranes. The consolidated delay distribution of the departments from NOV’09-MARCH’10 is provided below:
DELAY AREAS TOTAL
MECHAICAL 1368
ELECTRICAL 3196
ISTRUMETATIO 12
PROCESS 178
CRAES 0
Table 4.8 4.2.1.5.3 PARETO AALYSIS:
Fig 4.10
Electrical problems are the major delay causes in the crane-1. Some of the common mechanical problems faced by the crane-1 are as follows:
1. MH- M.H got tripped.
2. DSL- Remote signal cut off problem.
3. Drip tray- Drip tray got tripped.
4. CT- CT got tripped
Secondly, mechanical problems cause delay in large number for crane-1. Some of these problems are:
1. LT- abnormal sound in rails.
2. Link- Cathode hook link got broken.
3. Hook- Anode hook struck up problem.
0 20 40 60 80 100
ELECTRICAL MECHANICAL PROCESS INSTRUMENTATI ON CRANES
Series1 Series2
42 IMPROVIG THE OPERATIOAL EFFICIECY AD
As we see the Pareto chart, it is clear that in crane
main hoist. Some of the problems frequently occurring in the main hoist are as follows:
1. MH brake not good.
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the Pareto chart, it is clear that in crane -2 the major problem causing area is the main hoist. Some of the problems frequently occurring in the main hoist are as follows:
DSL CT LT HOOK LINK SPREADER BEAM DRIP TRAY REMOTE PANEL
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2 the major problem causing area is the main hoist. Some of the problems frequently occurring in the main hoist are as follows:
REMOTE PANEL
Series1 Series2
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The delay problems are also divided among the departments as mechanical, electrical, process, instrumentation and cranes. The consolidated delay distribution of the departments from NOV’09-MARCH’10 is provided below:
DELAY AREAS TOTAL
ELECTRICAL 1268
PROCESS 94
MECHAICAL 77
ISTRUMETATIO 0
CRAES 0
Table 4.10 4.2.1.5.5 PARETO AALYSIS:
Fig 4.12
Electrical problems are the major delay causes in the crane-1. Some of the common mechanical problems faced by the crane-1 are as follows:
1. MH- M.H got tripped.
2. DSL- Remote signal cut off problem.
3. Drip tray- Drip tray got tripped.
4. CT- CT got tripped
In crane-2 the second delay causing problem is process delays. Some of the common process delays is Hook- Cathode hook link got broken/bend.
0 10 20 30 40 50 60 70 80 90 100
ELECTRICAL PROCESS MECHANICAL INSTRUMENTATION CRANES
Series1 Series2
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4.2.1.6 OPERATOR SKILLS AD EXPERIECE: operators handling the various