Color-Port gages provide
continuous indication of
boiler water levels as
required by the 1986 ASME*
Boiler and Pressure Code.
Under PG-60,
the Code states: 60.1 Water Level
Indicators
60.1.1 Each boiler, except
forced-flow steam generators with no fixed steam and water line, and high-temperature
water boilers of the forced circulation type that have no steam and water line, shall have
at least one water gage glass. Boilers operated at pressures over 400 psi, shall be
provided with two water gage glasses which may be connected to a single water column or
connected directly to the drum.
Two independent remote level indicators may be used instead of
one of the two required gage glasses for boiler drum water level indication in the case of
power boilers with all drum safety valves set at or above 900 psi. When both remote level
indicators are in reliable operation, the gage glass may be shut off but shall be
maintained in serviceable condition.
When the direct reading of gage glass water level is not readily
visible to the operator in his working area, two dependable indirect indications shall be
provided, either by transmission of the gage glass image or by remote level indicators.
* The American Society of Mechanical Engineers,
boiler and Pressure Vessel Committee, establishes rules of safety governing the design,
fabrication and inspection of boilers and unfired pressure vessels. |
Features and Benefits • Long Service Life — The
combination of design and long lasting materials assures longer life.
• Low Maintenance — Individual port assemblies can be replaced in
minutes with the gage in place. Spring loading maintains proper pressure on glasses and
gaskets at all times.
• Two-Color Readings — Contrasting red and green
readings show water level by means of illuminator spot-lights. Water space is shown
through green colored glass, steam space through red.
• Choice of direct, mirror, TV or fiber optic viewing systems.
• Two Basic Designs — For boiler systems to 1100 psi — (76
bar) low pressure gages have nipple ends for use with stuffing box valves or flanged ends
for use with Welbloc valves. For boiler systems to 3000 psi — (207 bar) high pressure
gages have flanged ends for use with Welbloc valves.
• Glasses are accurately molded and tempered to Yarway specifications.
The assembly of glass, mica and gasket is registered precisely in the gasket groove in the
body.
• Micas — High quality; for protecting the inner surface of each
glass from the erosive action of steam and water.
• Gaskets — Gages use a specially
molded flexible graphite sealing gasket between mica and gage body ensuring a tight seal.
|
