From: David Randolph
Sent: Tuesday, September 25, 2007
3:32 PM
To: James Kelly; Chris Kelsey
Cc: Randy Norman; Tom
Giese
Subject: Neuros Blowers
Good
day,
Randy
and myself took a tour of the Renton WWTP today to look at the Neuros
Blower. It is Randy's and my opinion that we should look into the
feasibility of using the system. The following are some of the pro and
cons that we saw.
Pros
- Size. The size of the blower, 100 Hp motor,
VFD, HMI, and other electrical items is half the size of our existing
blowers.
- Noise. The system is so quiet you can stand
next to it and talk in a normal voice. This does not include start up
and shut down when the system is bypassing air to atmosphere.
- Estimated O&M. Randy reviewed the O&M
manual and we spoke with one of the operators. It appears that the
operations requirements and maintenance is minimal. Bearings are air so
no oil buy, change or clean up and dispose of. There are five micron filters
to change and if the environment was prescreened they should last for at least
one quarter.
- VFD
operation. The operation of the blower is from 40% to 100% and
efficiency do not drop at any point. I only herd this in statement and
needs verified.
- Weight. The total weight of the system was 1500
pounds. This is the weight of our 100 Hp motor alone.
- The
system does not need any footing or foundation to be customized for
it. Do to the low vibration and enclosure design the system can be
brought in and using adjusting pads provided leveled then discharge pipes
installed.
- Twenty % reduction in energy. This was not
verified by us and should be looked in to.
Cons
- Cost. The 100 HP blower system costs about
$100,000.00. This is the entire cost to include MCC and VFD.
Treatment Equipment rep stated that Alderwood had credits from PUD that made
up for the extra capital costs.
- O&M. Although there is not much cost for
maintenance we did note that you can not work on the system and if a part
fails you will just replace it. The motor for instance would need
replaced if a bearing fails.
- Noise. During start up and shut down the blower
is very noisy! A jet airplane.
- Electronics. At this time the system does not
use Allen Bradley or seimen plc, and IO cards. The company is working on
that portion however and it is expected that they will be providing the PLC,
HMI and other parts with Allen Bradley in the near
future.
If you
have any questions let Randy or myself know.
Thank
you
David B.
Randolph
Wastewater Utility
Supervisor
City of
Arlington
(360)
403-3515