Bell & Gossett DN0130D Domestic Pump 250°F Condensate Units Series SA-PT - Manual (Page 5)

MAINTENANCE PROCEDURE FOR RED LINE GAGE GLASS
DO NOT’S
DO NOT work on any gage until you have carefully read these
warnings & instructions.
DO NOT reuse any tubular glass, packing, or seals.
DO NOT use glass that is scratched, chipped, or otherwise
damaged. Used glasses may contain damage and are poor
safety risks.
DO NOT exceed the glass or gage manufacturer’s recom-
mended working pressure or maximum recommended gage
glass length.
DO NOT bump, impact or scratch the glass.
DO NOT tighten gland nut and packing beyond gage manufac-
turer’s recommendations.
DO NOT operate gages unless gage valve sets are equipped
with drain vent and safety ball check.
DO NOT attempt to clean glass while the unit is in operation.
Cleaning should be done without removing the gage glass.
DO NOT attempt to inspect the glass, to adjust tie rods, pack-
ing nuts or glands, to inspect or tighten other fittings without
isolating the gage from the pressure vessel and opening the
drain vent.
DO NOT weld, impact, or sandblast in the gage glass area
without protecting the glass.
DO NOT have glass-to-metal contact.
DO NOT subject gage glass to bending or twisting stresses.
DO NOT allow the gage glass to contact the bottom of the
packing gland.
DO’s
DO inspect the gage glass daily, keep maintenance records,
and conduct routine replacements.
DO install protective guards where necessary to protect
personnel.
DO protect the outside of the gage glass from sudden temper-
ature changes, such as drafts, water spray, etc.
DO remove all deposits from the seal areas, the gland nuts,
glands (where used) and use new packing before installing a
tubular gage glass.
DO examine gage glass for damage and seals for hard deposits
and tears.
DO verify that the tubular gage glass, gland, nuts, packing, etc.
are the correct size and type before installing.
DO ensure that system is protected by safety shut-off system
(e.g. safety ball check).
MAINTENANCE
Examine the gage glass regularly for any signs of clouding,
scratching, erosion, or corrosion. In new processes, the glass
should be inspected daily until the need for replacement
becomes apparent. This will help establish the routine inspec-
tion and routine replacement cycles.
CLEANING
Keep gage glass clean using non-abrasive commercial glass
cleaners. Where regular cleaners do not seem to work, use
dilute acids such as Hydrochloric (muriatic) acid. Always
observe safety rules when handling hazardous cleaning solu-
tions. Never use wire brushes, metal scrapers, or harsh abra-
sives which could scratch the glass.
INSPECTION
Scratches, corrosion, chips, surface flaws, or nicks on the sur-
face or edges weaken the gage glass. To examine for these,
shine a very bright concentrated light (“Burton Lite” or power-
ful flashlight) at about 45° angle. Anything which glistens and
catches the fingernail or any star-shaped or crescent-shaped
mark which glistens, is cause for replacement. Any gage glass
which appears cloudy or roughened and will not respond to
cleaning procedures, should be replaced.
STORING
Keep gage glasses in original packaging until ready to install.
HANDLING
Avoid bumping, chipping, or scratching glass. Any glass-to-
glass contact can cause scratches and must be avoided.
5
WARNING: EXPLOSIBLE
Improper installation or maintenance of tubular glass
can cause immediate or delayed glass breakage resulting in
bodily injury. To avoid breakage observe the following Do’s
and Do Not’s and Use and Care Instructions, as well as
tubular gage manufacturer’s instructions. If a gage glass
breaks, contained substances can be released and glass
can be blown out of the unit with great force. Always wear
safety glasses when looking toward a gage or working on a
gage glass assembly. Guard against the possibility of fire
and explosion. Protect glass from impact, scratches, other
surface damage and sudden temperature changes. These
can weaken or stress the glass and lead to breakage.
Failure to observe the following Do’s and Do Not’s can result
in glass breakage and its explosive release of pressurized
system contents and flying glass particles.
INSTALLATION
Always follow tubular gage manufacturer’s recommended pro-
cedures for glass replacement.
Before installing a gage glass, remove all deposits from the seal
contact surfaces of the gland nut and the gland (where used).
Check sealing surfaces for cleanliness and smoothness. Once
a gage glass has been removed from its mounting, regardless
of the reason for its removal. Discard the glass and replace with
a new piece.
Always use new packing, seals, and/or O-rings (if required)
when replacing a tubular gage glass. Used packing seals and
O-rings will not properly support the gage glass or provide the
proper pressure seal without stressing the glass.
PYREX ® Tubular Glass
Nut
Insure Clearance Between
Glass Surface and the
Upper and Lower Fixtures
Tie Rod
Gland
Packing