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Ameridrives Custom Ameriflex® Couplings for Polymer Resin Pumps
A major global petrochemical company experienced a coupling failure on a polymer pump
in one of its larger resin processing facilities. The coupling problem caused expensive,
time-consuming production line shutdowns.
Ameridrives was contacted to provide a solution. Gear couplings were initially installed
on all the polymer pumps between the pumps and gearboxes for this high-torque, low-speed
(50 RPM) application. However, while plant maintenance crews did their best, keeping all the
expensive gear couplings properly lubricated throughout their plants around the world proved
to be a tough challenge.
After careful review of the situation, Ameridrives engineers recommended replacing the
gear couplings with Ameriflex diaphragm couplings, which can run continuously and require
no lubrication or maintenance (unlike gear couplings which require maintenance at
six-month intervals).
Ameriflex couplings are typically used on high-performance, high-speed applications. However,
the Ameridrives team collaborated with industry-leading experts to provide custom-designed
diaphragm couplings to meet the resin pump requirements. Many custom Ameriflex couplings
were delivered in a variety of sizes and configurations with torque ranges up to 1,100,000 Nm
(10,000,000 in.lbs.). One example is a 10' long, 23" diameter coupling (shown in upper left)
that features specific split retaining rings on both the pump and gearbox end hubs, multiple
convoluted diaphragm pack flex elements at each end, and a special spacer configuration for
added stiffness in this dual output application. An integral indexing/timing device aligns the
coupling with the mixing blades of the polymer pump.
Highlights
- Unique separated
multi-convoluted
diaphragm configuration
- No wearing parts,
no lubrication and no
required maintenance
- Low windage and
horsepower loss
- High torque-to-weight and
torque-to-diameter ratios
- API-671 compliant
- Stainless steel diaphragms
designed for infinite life
- Black oxided, heat
treated, alloy steel torque
transmitting components
are standard