It is considered ideal to fix a calorised lance pipe to a lifting hook or stand or an automatic manipulator and insert it through the sight hole on the door at an angel of 25oC to 30oC to the surface of molten steel and hold the end of pipe at a depth of 150 mm below the slag.
TECHNO-ECONOMC FEASIBILITY OF USING CALORISED LANCING PIPES
BASIS OF THIS REPORT
1. The life of calorised pipes is 6 times more than of M.S. Black pipes.
2. Base price of calorised pipes (1” x 5.5m) per piece is approx.
Rs.890/-.
base price of 1”x5.5m M.S. Black per piece
is approx. Rs. 198/-.
3. Prices are as ruling in the year 2002-2003.
4. Use of an average 5-8 minute per heat for changing 2/3 pipes.
5. An average 18 taps per day ( of 24 hrs.).
COST ANALYSIS OF CONUMMPTION OF LANCING PIPES (FOR 24 Hrs./ 18 Taps)
(I) Saving on account of Pipe consumption only.
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Therefore
Average Saving per day = Rs. 2235.00
A – Charge Containing higher quality scrap
B – Charge Containing lower quality scrap and higher DRI
Therefore Saving per
month = Rs. 2235 x 25 Rs.
55875.00
(For 25 working days)
Therefore Saving per year = Rs. 55875 x 12 Rs.
6,70,500.00(I)
(II). Earnings on account
of saved time calorised pipes:
On an average 5 minutes will be saved per heat, which
means you will save time for extra heat
i.e., 1 extra heat for every 16 heats.
Therefore
additional heats available per month =
(18 x 26)/16 = 29.25 Nos.
and additional heats available per year =
(29.25 x 12 = 351 Nos.
Conservatively lets us consider total additional heats =
100 Nos.
available per year
= 100
Profit
on finished steel from 100 heats = 0.X x H x T x R x F
Where X = Percentage profit on finished steel (considered 15
%)
H
= No. of Heats = 100
T
= Yield in Tons of Liquid Steel per heat = 40
R
= av. Sale price of finished steel in Rupees = Rs. 11,000/-
F
= Utilization Factor of liquid steel = 0.95
=
0.15 x 100 x 40 x 11,000 x 0.95 =
Rs. 62,70,000.00 – (ll)
Therefore
Total Earnings (l + ll)
= Rs. 69,40,500.00
