i.
Hypochlorites:
AWWA B300.
j.
Liquid Chlorine:
AWWA B301.
k.
Polyethylene Encasement for Ductile Iron Piping:
AWWA C105.
l.
Gauges - Pressure and Vacuum Indicating Dial Type-Elastic Element:
ASME B40.100.
m.
Thermometers:
ASTM E 1.
Mercury shall not be used in thermometers
2.1.3
Pipe Insulation Material
Insulation shall be as specified in Section 15080A THERMAL INSULATION FOR
MECHANICAL SYSTEMS.
2.2
PIPE HANGERS, INSERTS, AND SUPPORTS
Pipe hangers, inserts, and supports shall conform to MSS SP-58 and MSS SP-69.
2.3
VALVES
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NOTE: Drawings will indicate equipment isolation,
branch, and sectionalizing valves for water systems.
Valves will be provided so that system maintenance
can be performed without complete system shutdown.
In general, valves should be provided in the
following locations:
a.
Each branch serving a group of fixtures.
b.
Each riser serving a group of fixtures.
c. Isolation valves will be provided on the supply
and discharge of booster and circulating pumps and
on all water heaters.
d. In nonfreezing climates, wall faucets will be
installed on outside walls and lawn faucets in
parking, garden, and lawn areas. In freezing
climates, freezeproof wall hydrants will be
installed on outside walls and yard hydrants in
parking, garden, and lawn areas. Indicate on the
drawings height of hydrants and faucets above
finished grade.
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Valves shall be provided on supplies to equipment and fixtures. Valves
shall be gate valves, unless otherwise specified or indicated. Valves 65
mm 2-1/2 inches and smaller shall be bronze, with threaded bodies for pipe
and solder-type connections for tubing. Valves 80 mm 3 inches and larger
shall have flanged iron bodies and bronze trim. Pressure ratings shall be
based upon the application. Grooved end valves may be provided if the
manufacturer certifies that the valves meet the performance requirements of
applicable MSS standard. Valves shall conform to the following standards:
SECTION 15405A
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