Application:
For viewing the internals of vessels, silos, reactors etc.,
mainly used as fluid level indicator.
General:
The base frame of rectangular Sight Glass fittings is welded
onto or into the vessel wall. Then the Sight Glass plate together
with two seals is firmly bolted down by the cover frame and
a set of fastening bolts.
Operating Conditions
It is strongly recommended to check the strength of reinforcement
around the cutout in combination with the vessel wall according
to current regulations.
Pressure: 235 psi, vacuum
Temperature: 243 °C with borosilicate glass DIN 7081
100 °C with soda lime glass DIN 8903
Those temperatures refer to
unprotected glass plates, i.e. without mica protective sheet.
Certificates / Testing:
Depending on customer's requirements certification and
testing can be provided to DIN 50 049 3.1 A/3.1 B (extra charge).
Parts and available materials:
(in explosion drawing on the right)
| Items |
Parts name |
Material options |
| 1 |
base
frame |
carbon steel RSt 37-2,
stainless steel
316L, 316 Ti or alternative |
| 2.1 |
seal |
KLINGERsil C-4400, Neoprene,
PTFE or alternative |
| 3 |
Sight Glass plate |
soda lime glass, tempered
max. temp 100 °C; or
borosilicate glass tempered,
max. 243 °C |
| 4 |
cover frame |
carbon steel RSt 37-2,
stainless steel
316L, 316 Ti or alternative |
| 5 |
securing
bolts |
carbon steel 5.6 or stainless
steel |
Assembly
Before inserting the glass
plate, the base frame should be checked to ensure that the
seating is flat and free of distortion. Any uneven spot or
distortion (possibly caused by the welding into the vessel
wall) might lead to leakage or even break the glass plate
when the cover frame is tightened.
After the base frame was welded
into or onto the vessel wall, fit the Sight Glass 3 with the
two seals 2 and cover frame 4. Insert the se-curing bolts
5 to fasten the cover frame. Always ensure that the tight-ening
follows progressively from one end along the length of the
cover frame alternating between each pair of opposing bolts.
Tighten each bolt only a little at a time, and then repeat
the process.
|
Complete assembly
of a rectangular Sight Glass unit
Exploded view
of a rectangular Sight Glass assembly
|
| Alternative versions
in shape, size and material are available on request. External
radiusing of the flanges (2 x R) is available at extra cost.
Lumiglas rectangular Sight
Glasses are also available with closed base frame (see sketch
on the right) for use as external liquid level indicator.
In that case the unit is fed via pipes through holes in the
base frame plate. The unit comes with such holes suitably
drilled or tapped.
Ordering Information:
Please specify the selected item as follows:
Rectangular Sight Glass fitting
Length
Material: Base frame; open or closed (plate)
- Cover frame;
- Glass plate
- Seals
Test certificate type: 3.1A
(TÜV) or 3.1B (optional)
|
|
