structural engineer - need some help 1

[ARS97]

I'm designing a bypass gate for some fan ductwork. During operation, this gate forms the "roof" within the ductwork while air flows through. My question is this - how do I determine the negative pressure (suction) on this gate when air is flowing past it? Here's some info:
- ductwork is feeding a baghouse for a dust collector
- ductwork is roughly 65" square
- the gate is roughly 65" wide x 10' long
- 118,000 CFM
- 3,500 fpm

Any help? It's been awhile since I had to deal with fluid flow......thanks!

 

[willard3]

From "Forum Policies":

>>>These fora should not be used to bypass your own in-depth research on the issues that affect you, nor is it intended to be a substitute for appropriate professional assistance within your field or geographical region.>>>

You may have to consult an Engineer who designs air systems.

 

[trashcanman]

Yes, you do need help - from an HVAC Engineer. With an air system of that capacity, it is not a simple residential system.

 

[ARS97]

Upon closer inspection, the baghouse designer has stated on the drawings that the system is designed for 10" of water, or about 52 psf. This is what I was looking for.....

 

[willard3]

You mean that you didn't even read the drawings before you posted here?
Doesn't seem the best approach.

 

[ARS97]

Just received additional ones........way to assume pal.....been real helpful

 

[msquared48]

andysines:

Your use of the phrase "Upon closer inspection" implies you initially had some information to inspect from which you eventually gained the information you needed. There is no indication from your first post that you obtained additional drawings. Hence willard3's comment.

Frankly, I assumed that you looked closer at the drawings you already had examined and found what you needed. Happens to me all the time.

No worries though.

Mike McCann
MMC Engineering

http://mmcengineering.tripod.com

 

[ARS97]

Well, I suppose I could've worded it differently.....but the truth is that additional drawings DID become available that had more information on them. The "closer inspection" involved tracking down additional information from the baghouse designer that was not initially available. I just didn't appreciate the tone that willard3 had established in both of his posts. Moving on though.......