MIL-HDBK-1005/9A
Section 4:
METERING, INSTRUMENTATION AND CONTROL, AND CHEMICAL
FEEDING
4.1
Scope. This chapter contains criteria on metering,
instrumentation, controls, and chemical feeding devices used in
wastewater disposal systems.
4.2
Related Criteria. Certain criteria related to the
subject matter of this Section appear elsewhere in this
handbook. Refer to Sections 2 and 3 for instrumentation,
control, and chemical feeding for selected wastewater treatment
unit processes and operations.
4.3
Use of Criteria. These criteria indicate simple
recommended practices applicable to plants with up to 5 Mgd
average flow.
4.3.1
Special Cases. Specific design problems may require
departures from these practices; therefore, use these criteria
with discretion. For example, use of computers and
microprocessors for data logging, indication, and process
control is considered an emerging technology. This technology
is presently primarily applicable to large wastewater treatment
plants with adequately trained staff to maintain the hardware
(greater than 10 Mgd size). However, improvements in
electronics, hardware, software, and sensing devices (primarily
sensing elements) will make this technology more desirable for
smaller plants. Detailed information is not included for such
emerging technology because of its state of rapid change and
because additional development and application experience need
to occur before application to the smaller naval facilities is
justified.
4.3.2
Letters in Tables. To further clarify terms in the
tables, the letters (E), (O), and (S) are used to mean:
(E) = Essential
Items described are required wherever
particular applications occur.
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