Stainless Steel Trap Corrosion
Summary:
Based on the available data which visual analysis
of the corroded traps, the most likely cause of the trap
failures is pitting due to attack by chlorides. The source
of the chlorides appears to be the high incidence usage
of Ultra Clorox® Germical Bleach as a disinfectant.
A number of options are available to address this problem.
These options include changes to work practices and use
of alternative materials of construction.
However, no
single material of construction is suitable for any and
all types of chemical exposure. Any program to address
the problem with the traps should include specific guidelines
for laboratory drain disposal practices at each laboratory.
Eliminating the use of sodium hypochlorite should be considered.
This should greatly reduce the problem with the traps
and greatly decrease potential future or long term problems
with other parts of the 316L drainage system.
If sodium hypochlorite is used, effects on traps should
be reduced by work practices
including: minimizing the concentrations by using dilute
solutions; minimizing the
concentrations by diluting before the solutions are discharged;
running clean water through the drains at the same time
that any solution is discharged; flushing the drains with
clean water immediately after the discharge of any solution
containing sodium hypochlorite of sodium chloride; minimizing
the temperature of any solutions that are discharged;
and discharging solutions only at a high pH.
Format:
Pages :13
Size: 392 kb
Author :Farhad Memarzadeh, Ph.D., P.E.
Download:Stainless Steel Trap Corrosion
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