Re: Pulse Pipes
I don't think there is a precise answer. On the one hand you are trying to lose the 100 psi pressure out of the jet to blow up the whole bag. On the other hand, if the jet is too far into the bag, you don't activate the top foot or so of the bag. The venturi is one attempt to induct air pressure also into that top section which normally does not respond well to the pulse of air.
In our applications we took the venturis out because they weren't worth the bother. It made only a marginal difference in the life of our bags.
A good way for a manufacturer is to try out on a real baghouse, and experiment with different heights. When you pull out a sample bag you will be able to see what is happening in the top section of the bag. ■
Pulse Pipes
A general rule is that the jet of compressed air from the pulse pipe hole forms a cone of 20 deg. included angle.
Position the pulse pipe at a height which allows the jet to expand to the filter bag diameter at the level of the top of the bag.
Select the pulse valve and pipe diameter in consultation with the pulse valve supplier.
Michael Reid. ■
Pulse Pipes
Hello ctomasinor
Normally this depends on your Venturi design & dimensions.
You can do it by mock up experiment as follows.
1> make small box with air header 100-120 psi with pulse solenoid
2> situation similar to jet pipe & venturi arrangement for one bag
3> As per Bernoulli’s equation the pressure gets converted to velocity, now here comes into play your venturi design
4>measure Max velocity pressure attainable, by experimenting the dist between jet pipe & venturi top, at the out let of venturi so that your 10' long bag will be effectively cleaned
5>see animation at http://www.sxcalibur.com/
Alternately you can use Cartridge Bag or Pleated bag Design that does not require venturi
& lot advantages as to pressure drop/reduced pressure pulsing/small sizing for given application
regards ■
Pulse pipes
Dear Srs.
i am designing a filter bags dust collector, and have a doubt, i have saw several dust collector and it has differents height between pulse pipe and tubesheet (2", 3" 7" for example). what do you believe is the better height to use when we do not use nozzles and use a venturi in the filterbag. compress. air 100 psi, diameter of filter bags 6" and 10' long
i have my company in central america ( El Salvador),
thanks for your time and i will waiting for your answer. ■