Instrument Maintenance and Repair. The success of water instrument
maintenance procedures is based on knowledge of the construction, operation, and
adjustment of the equipment; availability of the necessary special tools; and stored
spare parts and special instructions from manufacturers. For the special knowledge
necessary, maintenance personnel are advised to consult the manufacturer's
instructions. Additional information on maintaining water meters can be found in
several publications (see pars. 2.1.4, 2.1.5, 2.2.1, 2.2.5, 2.2.24, and 2.2.41.
Maintenance Schedules. The design and intricacy of meters,
instrumentation, and automatic control systems depend on the function to be performed
and the manufacturer's particular equipment. Because there are many manufacturers
of meters, instruments, and automatic controls, listing specific maintenance procedures
that apply to all units is not possible. The procedures here are basic and the minimum
required for the most common types of units. When developing maintenance
schedules, personnel may adapt the procedures given here to specific directions
issued by the manufacturers.
Inspection and Maintenance Records. It is a good idea to keep a log of
all inspection and maintenance actions. A particularly useful record system is a card
file for each piece of equipment. This card shows the type of equipment, the
manufacturer's serial number, the date installed, the location, and the frequency of
scheduled maintenance. If these cards are arranged chronologically, each card will
come to the attention of maintenance personnel at the proper time for the inspection to
be made. Many water suppliers are now using computers in their operation.
Information commonly kept on a service or meter history card is entered into a
computer to establish a permanent record. A control number is associated with each
service or meter. Any future information concerning work on a customer service line or
meter testing and repairs can be entered for the appropriate control number. More
information management can be found in pars. 2.1.4 and 2.2.1.
Sensor Maintenance. Maintenance procedures for flow, pressure and
level-sensing devices are given in Table 27.