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CAPITAL REPAIR AND

MODIFICATION

-HANDS ON TRAINING

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ABOUT CRM

CRM is a ------

1. central agency

2. catering to capital maintenance requirements of blast

furnaces and mills, rmp1 and ccd. There are three deaprtments mech 1, mech 2 and

plannning.1. Mech1 looks after blast furnaces

2. Mech2 looks after mills area

3. Planning coordinates activities of CRM with all the

other departments.

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TYPES OF REPAIRS

1. CATEGORY III 3-5days charging system change

2. CATEGORY II 90 days top + lining + coolers ofentire furnace till hearth

3. CATEGORY II(EXTENDED)

All furnace above ground

4. CATEGORY I 120 DAYS Entire furnace includinghearth and base of furnace.

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LEARNING POINTS

The winch arrangement for raising loads.

2 T,3T,5Tand 10T types of winches.

The auxillary winch arrangements for cross movements.

Welding machines and rectifiers.

No of falls increased for raising capacity of load to be taken by the

winches

The variation of load carrying capacity with the change of angles of

wire sling.

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LIVE CAPITAL REPAIR WE SAWAND SOME SALIENT POINTS

BLOOMING AND BILLET MILL

1. The m 42 not that were changed in 1000t shear machine andwelded to the adjacent nut for for withstanding cyclical loads of

shearing machine.

2. The rolling line that was cooled before the operation could takeplace

3. Coordination of various departments for activities like gettingelectrical licence to do welding work and various aspects of safety

4. The pin changed in the chain drive.

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CAPITAL REPAIR contd..

BLAST FURNACE 1

1. The capital repair was category iii

2. The winches arrangement for lifting the heavy equipments likecharge distributor big bell and small bell.

3. The woods that are burnt to keep the furnace at sametemperature so that when resumed extra fuel would not be usedagain for attaining same temp.

4. The preparation phase in which the work area is cleaned and allthe materials are made preapared for the maitainence work to beheld as scheduled.

5. The load testing of the winches after its installation at twicethe

rated load to avoid failure due to impact loads