Emerson PENBERTHY H Series Kurulum, Çalıştırma ve Bakım Talimatları - Sayfa 8
Ölçüm Cihazları Emerson PENBERTHY H Series için çevrimiçi göz atın veya pdf Kurulum, Çalıştırma ve Bakım Talimatları indirin. Emerson PENBERTHY H Series 10 sayfaları. Flat glass gages
Sayfayı YazdırPENBERTHY SERIES H FLAT GLASS GAGES
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
8.2 Inspection of glass seating surfaces
Clean the glass seating surfaces on the liquid
chamber and cover with a soft metal scraper
(preferably brass) to remove all burrs, rust and
remnants of the previous gaskets and cushions.
Exercise extreme care to avoid gouging or
scarring gasket and cushion seating surfaces.
Use a known flat piece of metal the same
approximate length as the glass or a new
piece of glass and a thickness gage to check
flatness of each glass seating surface on liquid
chamber and under cover. Surface must be flat
within 0.002 inch (0.05 mm). If any one surface
is found to be beyond a tolerance of 0.002 inch
(0.05 mm), the entire gage must be disposed
of and replaced. Gasket seating surface must
have a final surface finish of 62 to 250 AARH.
WARNING
Flatness of glass seating surfaces outside
0.002 inch (0.05 mm) tolerance specified is an
indication of the gage having been overstressed
through repeated exposure to mechanical,
thermal or hydraulic shock during its previous
service. Operation of a liquid level gage which
has been overstressed will result in abnormal
stresses on the glass which may cause glass to
break. If surface finish is not in the 62-250 AARH
range, gasket may extrude under pressure with
resulting sudden release of pressure, leakage
of contained fluid, serious personal injury or
property damage.
Glass seating surfaces should NOT be
machined to achieve seating tolerance. The
chamber and cover are designed for a critical
thickness to achieve the pressure/temperature
ratings. Machining glass seating surfaces may
result in non-compliance to the necessary
critical thickness due to material removal.
8.3 Reassembly
If all glass seating surfaces are found to be
within the 0.002 inch (0.05 mm) tolerance
described in the previous section, proceed to
obtain new glass, gaskets, cushions and shields
(if used) and proceed to reassemble as follows
(refer to exploded parts view in Section 11
if needed):
1. Clean threads on bolts and nuts to remove
all paint, rust and scale. Apply a light coat of
oil to the threads.
2. For transparent gages, insert bolts through
half the cover and lay out covers on cut 1 x 4
pieces of wood along the bench, side by
side, with the liquid chamber. Use chamber
to space covers and line them up with vision
slots.
3. For reflex style and belleville reflex style
gages, lay out covers on cut 1 x 4 pieces of
wood along bench, side by side, with liquid
chamber. Use chamber to space covers and
line them up with vision slots.
4. For transparent belleville style gages,
thread nuts on stud, place three belleville
washers under nut with pointed end toward
the nut (see Figure 2), insert stud through
each cover and lay out covers on cut
1 x 4 pieces of wood along bench, side by
side, with liquid chamber. Use chamber to
space covers and line them up with vision
slots.
5. Install one cushion inside each cover.
WARNING
Separate installation instructions are supplied
with replacement glass. All instructions supplied
with the glass must be followed, as there are
precautions to be taken when handling gage
glass. Among the precautions is avoidance of
bumping or sliding glass against any surface and
inspection of individual pieces. Failure to follow
any of the replacement gage glass installation
instructions could result in glass breakage with
resulting sudden release of pressure, severe
personal injury or property damage.
6. Install rubber band around each piece of
glass, then place glass centered inside each
cover.
7. Install shields, if used, and gasket on glass
being careful to keep components centered.
8. Place liquid chamber on the gaskets making
sure all components are aligned with vision
slot.
9. For reflex gage, install U-bolts in place by
tapping as needed with rubber hammer,
being careful not to lose alignment with
vision slot.
10. For reflex gage, quickly turn over assembly
onto backside of U-bolts. Assemble
nameplate, washer and nuts to U-bolts.
Tighten nuts with fingers. Using a torque
wrench, tighten nuts in 5 ft·lb (7 Nm)
increments, following the sequence in
Figure 1 until the torque values shown in
Table 4 are reached.
Note: depending on gage size there may be
less bolting than shown in Figure 1. Start at
the center and follow 'Z' pattern outward to
the limit of bolting on a specific gage.
8