Brochure

The Phase II-A Expansion of the Valley
Creek Waster Water Treatment Plant in
Bessemer, Alabama was completed in
1998. As the largest wastewater facility
in the state, the facility has two (2) 600
HP hot water boilers and is permitted
to treat 85 million gallons per day, but
currently is capable of treating up to
600 million gallons per day. The plant
operates around the clock and cannot
be shut-down for repairs, therefore,
the reliability of all the equipment
is crucial. Bell & Gossett’s Rolairtrol
proves to fill the bill. The Rolairtrol is
part of boiler loop in the process that
maintains a specific water temperature
and helps the chemical breakdown
of the waste. In a “not too hot, but
not too cold’ scenario, the anaerobic
digestor operates optimally at 95°F
to 98.6°F. At this temperature range
the mesophilic bacteria break down
dissolved organic material, releasing
methane, carbon dioxide and water,
along with the remaining organic
and inorganic material residue that is
stabilized into biosolids. The methane
by-product can be used as the fuel
to fire the boilers. The Rolairtrol
separates the air out of water in the
boiler loop to keep the heat transfer
at its highest efficiency.
A Tangential Flow-Through Design Patented B&G Design – The Rolairtrol provides maximum air
separation efficiency due to a combination of centrifugal force and
velocity reduction. The Rolairtrol’s tangential design creates a
whirlpool inside the vessel. The tangential design had the greatest
air separation efficiency when compared to less effective, straight
flow separators or coalescing designs.
B Designed for Typical Commercial B&G sized the Rolairtrol for typical flow rates found in U.S.
HVAC Flow Rates commercial HVAC applications. You won’t need an 8” size unit for
6” piping.
C Low Pressure Drops Compared to coalescing air separators, the Rolairtrol has much less
pressure loss at the flow rates recommended with the popular
coalescing designs. Extra pressure drop costs money in monthly
electric bills to operate the pump. The Rolairtrol costs less to
operate, and has superior first pass air removal efficiency.
D Baffle The baffle assures that air-free water is transferred to the outlet
connection while separated air is directed to the air collector.
E Vertical Strainer with Bottom Access Unlike the upper, horizontal strainer location in competitive air
separators, the Rolairtrol’s lower, vertical strainer does not
interfere with the vortex action, maximizing efficiency. In addition,
the strainer is accessible from the bottom of the unit, reducing
floor space while simplifying maintenance.
F NPT, Grooved and Flanged Connections Three connection options offer installation flexibility.
G Up to 36" Pipe Size Connections Models up to 36" in pipe diameter meet the air separation
requirements in the largest HVAC systems.
H Optional B&G Manual Blowdown Valve Simplifies installation, general maintenance and removal of
start-up debris.
Valley Creek W.W.T.P.,
Jefferson County, AL
5
Rolairtrol Features Rolairtrol Bene ts