Table 29 (Continued)
Check, clean, adjust or repair on same schedule
as individual components.
(1) W-Weekly; Q-Quarterly; SA-Semiannually; A-Annually;
V-Variable, as conditions may indicate.
(2) The frequencies shown are suggested frequencies that may be modified by
local command, as individual installation conditions warrant.
(3) Caution: Mercury fumes are poisonous. Use caution when handling mercury
and avoid spills.
Combination Totalizer Indicator-Recorder. There are various
combinations, designs, and styles of instruments in this classification. There are also
devices that sum totals from various individual totalizers, or show ratios of one flow to
another. In general, the maintenance procedures and schedules for this category are a
combination of the procedures for the individual units above. Develop a maintenance
schedule according to the manufacturer's instructions.
Water Meter Maintenance. Maintenance procedures for water meters
are summarized in Table 30.
Weir and Flume Maintenance. All types of head-area meters are used for
open-flow measurement, and their proper operation depends on the absence of any
kind of interference at the discharge opening. Maintenance procedures for weirs and
flumes are summarized in Table 31.
Safety. General hazards connected with servicing I&C systems include
use of hand tools, working in confined spaces, and electric shocks. Special attention
should be given to prevent electrical shock that may be caused by improper grounding
of building electrical systems onto the plumbing system. If residential water meters are
not mounted on a yoke, or if a permanent jumper wire is not provided across the meter
connections, use a separate wire with large alligator clips as a temporary bridge
between the pipes when meters are removed or installed. Additional safety information
is provided in the references cited in par. 9.2.