Odor Control Pipe Velocities

[glapfk11]

Hello All:
I am trying to size some piping for an odor control system to be installed at a wastewater treatent plant. In trying to size the odor collection pipes (i.e.duct work) I turned to Metcalf and Eddy for some guidance on pipe sizing and velocity constraints. Although M&E provides some guidance in regards to air pipe sizing and max/min allowable velocities, the discussion in the book seems to be specifically geared towards aeration systems so I'm not sure if it really applies to what I'm doing.

Does any one know of any standards pertaining to odor control system design?

 

[bimr]

Duct air velocity in the exhaust should be no less than 7.5 to 9 m/s (1,500 to 1,800 FPM) to hold particulates in suspension.

The ACGIH Industrial Ventilation handbook (22nd edition) recommends a velocity of
1000-2000 fpm.

If heavy particle loading is present, it would be a consideration for higher duct velocities. Otherwise, the maximum velocity of 2000 fpm. Higher velocity will also increase the noise.

http://ateam.lbl.gov/Design-Guide/DGHtm/existingductsizingmethods.htm

 

[JimCasey]

Bimr has a good point: Most ASHRAE-type duct sizing is weighted heavily toward keeping the velocity down for noise control. You are just moving air through a pipe and a few extra dB will never be heard over the pumps and blowers around a WWTP anyway.

 

[glapfk11]

Thanks "guys"..I appreciate the feedback....The link was helpful and so were the comments in relation to noise (I hadnt even thought about noise issues). FYI: I talked to some HVAC guys who gave me velocity ranges similar to Bimr's.