Flush plan 31 - orifice location

[Vladimir99]

Reagarding the flush plan 31 with orifice plate

It is normal to have the orifice on the suction line of the pump. (under the cyclone)

My understanding :
1. outlet recirculate to the cyclone
2. clean part goes to the gland *mechanical seal
3. dirt go to the suction line, but through an orifice.

By doing it like this, do you think the orifice will always be plug. (my application are caustic centrifugal pump and water pump)

Thanks,

 

[JJPellin]

In my experience, all three lines connected to a cyclone are orificed. But, the orifices in the dirty and clean outlets are usually built in as part of the cyclone design. The orifice that is variable is normally the one on the inlet to the cyclone. I only ever recall seeing one cyclone with a separate orifice on the clean outlet. And I have never seen one with an orifice on the dirty outlet. The correct configuration depends on the design of the cyclone. The particular cyclone would have been designed for a range of inlet flows and this design should dictate the correct location and sizing of all orifices. You must consult with the cyclone manufacturer for their requirements

Johnny Pellin

 

[rzrbk]

I usually try to put the orifice where the largest leak could be expected if seal tubing breaks. In this case it would be on the cyclone inlet, close to the pump discharge.

Agree with JJPellin, flow split between clean and dirty should be built into the cyclone itself.