JUNE 2007 ISSUE
RHFS Helps Solve NaOH Vapor Attack Problems in Bleach Applications
Chlor-Alkali customers have long been challenged to find a reliable pump for their
bleach processing & loading systems. Periodic pump failures are commonplace.
After being told they "ran the pump dry again" by a pump supplier, a frustrated
customer installed preventative dry-run monitors. When another failure occurred
a few month later, they knew it must be something else. That's when they gave RHFS
a call. After careful inspection and some sleuthing, it was determined that the
internal-magnet materials of construction were incompatible with solution chemistry.
Sodium Hypochlorite vapors were penetrating the Teflon encapsulating the magnet
and causing severe swelling of the Neodymium magnet. The swelling shut-down fluid
recirculation paths and caused the pump to overheat (easily mistaken for dry-run
condition). Our RHFS sales rep recommended an Iwaki MDM-EKK pump. MDM utilizes a
Samarium Cobalt internal magnet, which is compatible with the Sodium Hypochlorite
vapors. These MDM pumps are now in service and running great. Our rep is now looking
to spec more Iwaki pumps for the customers' Brine, Caustic, HCL, and De-ionized
Water pump applications. Let the RHFS team help solve your pump challenges. Call
us at 1.800.848.1141.
Filtration Control
To remove suspended solids for many processes the pre-coat
or diatomaceous earth (DE) filters are used to remove any suspended solids. There
are many processes that require a physical separation of one of more on the components.
It is important to know when any separation process has failed or is not operating
efficiently. This results in the high concentrations of suspended. There need to
be some type of monitor to detect filter failure to minimize downstream contamination.
A continuous filter separates solids by entrapping the suspended material in the
filter medium while allowing the liquid portion to pass. The build-up the trapped
solids will increase the pressure drop across the filter. The Mettler Ingold Forward
Scatter Model 8300/8200 is designed to measure levels of turbidity before and after
the filter. If very low levels are expected or required (0-500 ppm) it is best to
measure the filter product with the Mettler Ingold Forward Scatter Model 8300FS/8400.
Forward scatter is best for extreme low levels of turbidity. Turbidimeters have
also been use to monitor and control the DE addition and dosing. By monitoring the
addition we can assure the proper amount of DE is applied to the filter. This optimizes
DE usage and filter performance. This is done by using the analyzer to detect when
the filtered product is below the required level. The dual benefit is maximum on-line
time and minimum DE usage. .
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