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Sizing of Steel Chimney / Stack (Self Supported) : SR - No. Particular Uom Value # 1 Calculate Inside Diameter

This document provides details on sizing a steel chimney or stack for a 4000 kg/h boiler burning light diesel oil (LDO). It includes calculations to determine the inside diameter and height of the chimney. The inside diameter is calculated based on the flue gas flow rate and velocity. The minimum required height is calculated based on the sulfur content of the fuel. The selected chimney has an inside diameter of 600 mm and total height of 27 meters, constructed of steel in three sections.

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Suresh Damu Bhad
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555 views4 pages

Sizing of Steel Chimney / Stack (Self Supported) : SR - No. Particular Uom Value # 1 Calculate Inside Diameter

This document provides details on sizing a steel chimney or stack for a 4000 kg/h boiler burning light diesel oil (LDO). It includes calculations to determine the inside diameter and height of the chimney. The inside diameter is calculated based on the flue gas flow rate and velocity. The minimum required height is calculated based on the sulfur content of the fuel. The selected chimney has an inside diameter of 600 mm and total height of 27 meters, constructed of steel in three sections.

Uploaded by

Suresh Damu Bhad
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLS, PDF, TXT or read online on Scribd
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Sizing of Steel Chimney / stack (Self supported)

Sr.NO. Particular UoM Value

#1 Calculate Inside Diameter:


1 Boiler Capacity kg/h 4000
2 Fuel - LDO
3 Fuel calorific value kCal/h 10200
4 Boiler thermal efficiency % 88
5 Fuel consumption kg/h 240.64
5 Theoritical Combustion Air Required kg Air / kg Fuel 14.14
6 Excess Air % 20 OIL:10-20%, GAS: 5-10%
7 Actual Air requied kg Air / kg Fuel 16.97
8 Flue gas produced kg gas / kg Fuel 17.97
9 Total flue gas Flow at ambient-30 deg C kg/h 4323.85
9 m3/h 4323.85
10 Flue gas flow at exit temp. 250 deg C m3/h 7463.28
11 m3/s 2.073
12 Flue gas velocity assumed m/s 8
13 Cross section area of flow m2 0.259
14 ID of chimney at top m 0.57
mm 574.37
15 Selcted Diameter of chimney, OD mm 600
16 Bottom ID mm 1080
17 Base Plate OD mm 1380
18 Base Plate ID mm 930
19 Top Chair plate OD mm 1380
#2 Calculate Height of the Chimney:
1 Sulfur content in the Fuel % 1.8 LDO/HSD=1.8%, HFO=4%, W
2 Calculated minimum Height of the chimney m 26.76
3 Selected Chimney Height m 27
4 Length of Circular part m 9
5 Bottom stack Part m 10
6 Middle stack part m 8

Note- Enter values into white cells only.


L:10-20%, GAS: 5-10%

26.67834

DO/HSD=1.8%, HFO=4%, WOOD=0.07%


Chimney costing: Dia 600 mm x 27 m self supported

Length, width, Unit weight,


Sr.NO. Particular MOC thk
mm mm kg

Part-1

1 Cricular part Shell, (1900 x 6000 x 5thk) IS 2062, Gr. B 1900 9000 5 671.18

2 Stack Shell, P-2, (2353 x 4000 x 6thk) IS 2062, Gr. B 2353 8000 6 886.61

3 Stack Shell, P-3, (3419 x 10000 x 8thk) IS 2062, Gr. B 3419 10000 8 2147.13
4 Base plate(OD1380 xID 780 x 16 thk) IS 2062, Gr. B 1380 1380 16 239.19

5 Top chair plate (OD 1380 x ID 1084 x 12 t IS 2062, Gr. B 1380 1380 12 179.39

5 Gusset plate (300 x 150 x 12thk) IS 2062, Gr. B 300 150 8 2.83

6 Cage + ladder IS 2062, Gr. B 75.00

7 Monkey ladder IS 2062, Gr. B 50.00

8 Sampling platform IS 2062, Gr. B 125.00

9 Lightening arrestor+earthling strip

9 Warning lamps

10 Assembly

11 Painting

Total Cost

markup

Price after markup

Negotiation margin

Price after negotiation margin, (Selling Price), INR


Packing & Forwarding (1.5%)
Sub total
Excuse Duty@ 12.5%
Sub total
VAT @ 13.5%
Grand Total, INR

Chimney segments:
Chimney circular shell, part-1 Dia 600 x 9000 x 5 thk
Stack shell, part-2 Top id 600 x bot ID 840 x 6 tk x 8,000 LG
Stack shell, part-3 Top id 840 x bot ID 1080 x 8 tk x 10,000 LG
Tot. Unit Total cost,
Qty Remark
wt.kg Rate INR

1 671.18 86 57721.1

1 886.61 86 76248.5

1 2147.13 86 184653.4
1 239.19 86 20570.6

1 179.39 86 15427.9

8 22.61 86 1944.3

1 75.00 86 6450.0

1 50.00 86 4300.0

1 125.00 86 10750.0

1 6000 6000.0

2 3000 6000.0

1 10000.0

1 5000 5000.0

4396.11 405,065.68

0.60

675,109.46

0.80

843,886.83
12658.30
856545.13
107068.14
963613.27
130087.79
1093701.06

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