2.22.5.2
Gauge Glass
Gauge glass shall include top and bottom isolation valves fitted with
automatic checks, and packing followers; red-line or green-line gauge
glass; elastomer or polymer packing to suit the service; and gauge glass
guard.
2.22.5.3
Bulls-Eye and Inline Sight Glass Reflex Lens
Bulls-eye and inline sight glass reflex lens shall be provided for dead-end
liquid service. For pipe line mounting, two plain lenses in one body
suitable for backlighted viewing shall be provided.
2.22.5.4
Moisture Indicator
Indicator shall be a self-reversible action, moisture reactive, color
changing media. Indicator shall be furnished with full-color-printing tag
containing color, moisture and temperature criteria. Unless otherwise
indicated, the moisture indicator shall be an integral part of each
corresponding sight glass.
2.22.6
Flexible Pipe Connectors
Connector shall be pressure and temperature rated for the service in
accordance with ASHRAE 15 and ASME B31.5. Connector shall be a composite
of interior corrugated phosphor bronze or Type 300 series stainless steel,
as required for fluid service, with exterior reinforcement of bronze,
stainless steel or monel wire braid. Assembly shall be constructed with a
safety factor of not less than 4 at 150 degrees C 300 degrees F. Unless
otherwise indicated, the length of a flexible connector shall be as
recommended by the manufacturer for the service intended.
2.22.7
Strainers
Strainers used in refrigerant service shall have brass or cast iron body, Y
or angle pattern, cleanable, not less than 60-mesh noncorroding screen of
an area to provide net free area not less than 10 times the pipe diameter
with pressure rating compatible with the refrigerant service. Screens
shall be stainless steel or monel and reinforced spring-loaded where
necessary for bypass-proof construction.
2.22.8
Brazing Materials
Brazing materials for refrigerant piping shall be in accordance with AWS
A5.8, Classification BCuP-5.
2.22.9
Liquid and Suction Headers
Liquid and suction headers shall be provided on each multi-compressor
system. Headers shall be sized according to manufacturer's
recommendations. Each header shall be provided with service valves to
permit servicing each unit cooler and forced circulation air coil. Each
service valve shall have a gauge port which can be closed by back-seating
the valve and a front seat which can close off the line connected to the
manifold. Each service valve shall be provided with a removable,
protective valve stem cap or cover.
SECTION 15652A
Page 38
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