×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• 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.

# Thickness of longitudinal baffles with lamiflex seals

## Thickness of longitudinal baffles with lamiflex seals

(OP)
As per TEMA R- 4.421 : "Longitudinal baffles with leaf seals shall not be less than 1/4" (6.4 mm) nominal metal thickness".

Does the above thickness apply to all pressure drop conditions?? How do we calculate the thickness of longitudinal baffle (with lamiflex seals) if the pressure drop is higher than recommended (i.e. 1.1 kg/cm2)?

Regards

### RE: Thickness of longitudinal baffles with lamiflex seals

adilpervaiz, if you do not think 1/4" is sufficient, why not use the rules for welded long baffles, R-4.422?

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

### RE: Thickness of longitudinal baffles with lamiflex seals

(OP)

We are not using welded long baffle due to maintenance requirements(ease of bundle pulling for cleaning).

To be more specific, i want to know how we can calculate the thickness of a longitudinal baffle (with lamiflex seal) for a shell side pressure drop of 1.1 kg/cm2?
Is there any formula to calculate the thickness of long baffle with leaf seals like the one given in TEMA R-4.422 for welded baffle.

Regards

### RE: Thickness of longitudinal baffles with lamiflex seals

adilpervaiz, there are no specific TEMA rules for leaf-seal long baffles other than R-4.421. You could perform the calculation of R-4.422, but likely the assumed edge conditions will not apply in the case of a non-welded long baffle. A "more accurate" calculation may be a calculation assuming all edges simply supported, such as Roark Table 26, Case 1 (6th Ed.) using appropriate characteristic dimensions. Another case may more accurately represent your exact configuration.

A couple of observations on my part:
1) You need to assure yourself that the lamiflex will hold a seal at your pressure drop, else the exchanger performance will suffer.
2) It is possible to have a removable bundle with a welded long baffle. It is messy.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

### RE: Thickness of longitudinal baffles with lamiflex seals

Mike,
do you have an example of removable bundle with a welded longitudinal baffle?
I'm curious to see what it looks like.
Thanks!

### RE: Thickness of longitudinal baffles with lamiflex seals

CuMo, I don't have any drawings, sketches, etc, but can briefly describe the main features.

First, of course the cross baffles must be split to straddle the long baffle. Cross baffle cuts perpendicular to the long baffle are preferred, but not strictly necessary.

For floating head units, the floating head is split as well. TEMA has what appears to be a sketch of this arrangement, see Table A.131, sketch (k).

For U-tubes, the plane of the bends must be parallel to the long baffle. For more than, say, four tubeside passes this can become troublesome.

In any case, it is a messy business and a great deal of early attention must be paid to tube layouts, long baffle thickness, cross baffle arrangement, tie rods, seal bars, various clearances, etc.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

#### 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.

#### Resources

White Paper - Addressing Tooling and Casting Requirements at the Design Stage
Several of the tooling and casting requirements of a part can be addressed at the design stage. If these requirements are not addressed at the design stage, lot of time is spent in design iteration when the design reaches the die caster. These design issues lead to increase in time and cost of production leading to delay in time to market and reduced profits for the organization. Download Now
White Paper - The Other Side of Design for Assembly
Assembly level constraints need to be satisfied before the design can move downstream. This white paper will go through the various assembly level issues, which need to be tackled by various organizations on a regular basis. Know more about DFMPro, a design for assembly software. Download Now

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:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!