These are design questions, you should seek assistance from your supervisor or an experienced engineer.

I will make GENERAL comments

Dust vel. is typ in order of 18 to 20m/sec.

Duct wall thickness is 5mm MIN, depends on pressure and temp and yield strenghtr of material at max operating temperature.

Pressure vary...needs to be calulated, for cement plants..can get to -10kpA easily

Design ducts on slopes..avoid buildsups...horizontal ducts are sometimes design with 30% filling/loading

Suggest that U seek expert advice NOW to avoid serious and costly mistakes.

Cheers

James ■

I think what r.j.morrish is saying is that you need to employ a consultant to do this design work for you. ■

You should be able to work it all out from the equipment supplier data e.g. for a baghouse the air/cloth ratio is stated, the connecting flange sizes are on the drawings & cloth area is also mentioned. From that and the manufacurer's pressure relief value you get the velocity in the duct. For an engineer it should be quite straightforward. I note you have just thrown in an ESP that was not mentioned in the original post.

One of Parkinson's laws defines a consultant as "someone who borrows your watch to tell you the time and then walks off with your watch". Your consultant will be able to start a jewellery business unless you do your homework! ■

.... a consultant as "someone who borrows your watch to tell you the time and then walks off with your watch", you forgot the other bit "he charges you for the privilege" :-)) ■

You'll also forget thing when you get to my age. ■

Dear Sir.

We offer professional ducting system design services and can be contacted through our website DuctMonkey.net

http://www.DuctMonkey.net

Good luck with your project.

Best regards

James. ■

agree

for flue gas duct of boiler, you consider velocity about 8 to 10 m/s ., to find out the area of duct.

You must have total flue gas quantity. If you dont have it then take from your boiler supplier or contact me.

R u working anywere in Gujarat?

be in touch on harshadtmx@yahoo.co.in ■

Dear sir,

please guide me to determine the size calculation of vent ductiing for bagfilter.

how can we determine the size of ducting? and how can we design the duct size?

regards,

sandeep soni ■

Sir,

how can we determine the pressure drop of any bagfilter and its ducting?

and how can we calculate and design of inlet and outlet opening of bagfilter?

regards,

sandeep soni[/QUOTE] ■

Originally Posted by soni.indian87

Dear sir,

please guide me to determine the size calculation of vent ductiing for bagfilter.

how can we determine the size of ducting? and how can we design the duct size?

regards,

sandeep soni

Hello,

For vent duct calculation, you need following parameters :

1) Flow "Q" m^3/sec

2) Velocity "V" m/sec

3) Area "A" m^2

Q=V*A , From this formula u can find the area of ducting.

1) Normally in Cement plants, velocity range will be 14-18 m/s. (depend upon material)

2) You can find vent volume requirement from equipment drawing.

Plz see below example and try it

Point No.Vent LocQ=M^/minPipe SizeActual sizeSeriesAct VelCheck

1.0WF121157.3158.7150NB17.7OK

2.0BC1. 136.5207.4207.9200NB17.9 OK

3.0WF221157.3158.7150NB17.7OK

4.0BC1.2 36.5207.4207.9200NB17.9 OK

5.0AF121157.3158.7150NB17.7OK

6.0BC1.336.5207.4207.9200NB17.9 OK

Regards,

KB Asawa ■