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Taper in RCC Chimney

 
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rajkinchit
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Joined: 14 Aug 2015
Posts: 4

PostPosted: Mon Oct 08, 2018 6:33 am    Post subject: Taper in RCC Chimney Reply with quote

Dear all,

Can anyone provide me the reference/ guidelines for permissible taper values/ range in RCC Chimney. As per "Tall Chimney Design" by S. N. Manohar the taper range is 1:50 to 1:100. I have some reference drawings with taper much more than 1:50.

Regards,
Kinchit
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abhio
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Joined: 08 Mar 2010
Posts: 479

PostPosted: Wed Oct 10, 2018 2:08 pm    Post subject: Reply with quote

Dear Er Kinchit,

The maximum permissible taper would depend on the equipment of the contractor. Please consult with your contractor  to find out the maximum taper which their equipment can handle safely.
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rajkinchit
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Joined: 14 Aug 2015
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PostPosted: Fri Oct 12, 2018 9:57 am    Post subject: Reply with quote

Thanks a lot for your valuable inputs. Is there any restriction on maximum taper with respect to increased resistance for exhaust gas flow?

Thanking You!

With best regards
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spsvasan
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Joined: 18 Dec 2008
Posts: 317

PostPosted: Sun Oct 14, 2018 3:02 am    Post subject: Reply with quote

Dear Er.Kinchit

The top diameter of the chimney influences the escape velocity of the flue gas. The top diameter and the height of the chimney are dictated by the pollution control norms

The taper, in my opinion is governed by the structural and economic aspects. If the bottom diameter is larger the cost of rcc shell will reduce upto a certain diameter, but the cost of the insulating lining will increase. I think, the taper ratios mentioned by Er.S.N.Manohar are some time-tested values to get optimum cost of shell + insulation.

Variations do exist. For example, in the case of multiflue chimneys, the internal flues and also the external wind shield may have the same diameter throughout the height

Hope this helps

S.P.Srinivasan
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rajkinchit
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PostPosted: Wed Oct 17, 2018 5:40 am    Post subject: Reply with quote

Thank you for your helpful and valuable inputs.

With best regards
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