Quantcast Design Factors

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In summary, the Navy's first attempt at metal recovery in a plating
shop, though unsuccessful, did pave the way for future installation of
alternate environmental systems.  The Navy is now installing alternate
systems in NARF Jacksonville, and is planning to install them in new
plating shops.
Design.  Often, as indicated earlier, the design of these
facilities has not been totally satisfactory. It appears that
this problem is often caused by the practice of hiring A/E firms
without relevant experience.  Therefore, we recommend that the
Engineer qualification-A/E selection process described in
attachment (1) be closely followed on IWT and EP projects.
Lessons Learned:
The following paragraphs summarize lessons learned from previous
projects that need to be considered for all future projects. These
lessons learned have been grouped into five categories: design factors,
operational factors, equipment selection, material selection, and
Design Factors.
The following points should be considered:
a.  Effluent discharge limits set by regulatory agencies should
be evaluated closely and renegotiated with the issuing agency (if
there is sufficient justification) prior to proceeding on
facility plant design.
b.  Treatment operational requirements should be kept as simple
as possible.  Use instrumentation and controls only to reduce
operating manpower requirements or hazard exposure.  Highly
automated control systems have not been successful at Navy
facilities.  The degree of automation should be optimized by
balancing specific project factors. For example, a highly
automated system which requires a few well-trained operators and
considerable instrument maintenance must be compared against a
system with less automation but greater operator attention.  The
degree of automation must reflect the specific Navy facilities
staffing capabilities.  In most instances, this will include
automatic feed system, motorized valves, and other systems which
minimize relatively simple treatment tasks.
c.  Operational considerations must be closely coordinated with
waste treatment plant design in order to achieve an efficient and
reliable facility.
d.  Collection sewers, pumping facilities, and all treatment
tanks for acids and cyanides should be located completely
separate from each other to avoid mixing and severe safety
hazards.  Facilities should be separate and designed so that
spills or leaks could not result in cross connection between the
acid and cyanide operations.


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