×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

How to do Insulation for Stack (chimney)?

How to do Insulation for Stack (chimney)?

How to do Insulation for Stack (chimney)?

(OP)


Dear Sir,

I would like to know a normal practice for Insulation of a Stack (Chimney)!

As you see an above picture, Insulation is applied to inside of a Stack!
I think this way seems to have many benefits!

Anyone who know it well informs whether this application of Insulation for a Stack is normal or not!

I am highly appreciating!

Best Regards,

Replies continue below

Recommended for you

RE: How to do Insulation for Stack (chimney)?

(OP)
With the above way, I am concerned about Radial Thermal Stress due to Temperature Difference between Stack Shell and Air!
If Insulation is applied to Outside of Stack, Temperature Difference between Inside & Outside of Stack can be minimized!
But, Design Temperature of Stack will be increased!

I hope good comments from a engineer who has a good practice.

Regards,

RE: How to do Insulation for Stack (chimney)?

Love to know what you think the benefits are?

You will need solid insulation. What are you thinking of?

How big? / long?

Flue velocity and temperature?

Unless you have personnel protection issues I would say most flues are not insulated but made our of something which can withstand the flue temperature (unknown).

Much more information needed.

How to deal with joints?

Installation and QA is a bitch for internal linings of any type. Repairs are next to impossible. What's the difference in thermal expansion?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: How to do Insulation for Stack (chimney)?

Normal only if you've got really really hot gas, prob more than 500C.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: How to do Insulation for Stack (chimney)?

(OP)
Dear LittleInch,

We can think about Two Thermal Stresses for Stack!

1. Thermal Stress due to Longitudinal Thermal Expansion.
(I don't know exactly! maybe, The load due to Longi. Thermal Expansion increases stress in Stack shell.
Mostly Weight of Stack will be increase thermal stress.)
2. Temperature Difference Stress between inside and outside of Steel Stack in Radial Direction.
( Hot inside of shell is thermally expanded large, but, Outside of shell is done small.)

Without Insulation, Temperature Difference of Stack in Radial Direction will be large.

In Stack Design Code, ASME STS-1–2011
Stress Equations of Thermal Stresses are NOT specified in detail.
But. In code, Thermal stress needs to be considered!

Due to this reason, I am concerned about it!




RE: How to do Insulation for Stack (chimney)?

(OP)
Dear MintJulep

I saw an application of Refractory inside of Stack for High Temperature Operation such like a Fired Heater Stack!
(I remember they kept Stack steel temperature being under 80C with Refractory!)

And, I saw application of Insulation inside of stack.
They said "with insulation inside of stack, stack Temperature will keep cold!"
But, I don't know if it is normal practice or not.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login



News


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close