PD Blower Manufacturers?
PD Blower Manufacturers?
(OP)
Anyone have any expirence with blower manufacturers?
I'm looking to put a couple PD's in a clients wastewater plant. The packages from Aerzen, Kaeser, and Roots "looked" like well built stuff at their WefTech displays.
Does anybody have any expirences with these or any other manufacturers they would be willing to share?
Thanks
Mike
I'm looking to put a couple PD's in a clients wastewater plant. The packages from Aerzen, Kaeser, and Roots "looked" like well built stuff at their WefTech displays.
Does anybody have any expirences with these or any other manufacturers they would be willing to share?
Thanks
Mike





RE: PD Blower Manufacturers?
RE: PD Blower Manufacturers?
Thanks,
Mike
RE: PD Blower Manufacturers?
RE: PD Blower Manufacturers?
RE: PD Blower Manufacturers?
Steve
RE: PD Blower Manufacturers?
Curious - what are your concerns with the DO probes & VFD's?
The PD guys and turbo-compressor guys have gotten prety ugly, to the extend of each calling the other flat out liars.
I'm heading towards bidding both, using the turbo-compressor efficiency numbers, assessing a 20-year cost of power per HP for every factored HP over what is in the specs, and requiring either a ASME PTC-10 or ASME PTC-9 certified test during submittals to verify efficiencies. If everyone is telling me the truth the power factor penalty for the PD guys should bring their bid cost to equal with the TC guys.
Anyone care to play devil's advocate and critique my logic?
Thanks,
Mike
RE: PD Blower Manufacturers?
1. Centrifugal blowers are not a good application for flow throttling. As you throttle the centrifugal blower back, you also change the blower discharge pressure.
2. If you throttle back the centrifugal too much, the blower will go into "surge" and you have to shut down. Surge is internal recycling within the blower. Centrifugals have a limited operating range in which the blowers can be operated.
3. If you have multiple blowers, then the complications of throttling the blowers increase. How do propose to throttle multiple centrifugal blowers at the same time? What you end up doing is taking individual blowers off line. Then you have to readjust all the other blowers.
4. DO probes foul over time giving maintenance headaches. You have to plan for a probe cleaning program. The new models of probes from Endress + Hausers are much better in this regard.
5. You also can not throttle the low pressure aeration flows using valves. Valves will not work. Trying to control the flow of a low pressure compressible fluid is very difficult.
6. PD blowers will work for your application simply because they are positive displacement.