Pipeline ancillaries
Sight glasses
Dimensions / weights (approximate) in mm and kg
Single window
Size A
B
C
D
E
F
Weight
Spare parts
The spare parts available are shown in heavy outline. Parts drawn
in broken line are not supplied as spares.
3
/
8
"
89
16
32
64
50
4.8
64
50
4.8
64
50
4.8
64
50
4.8
0.6
0.6
0.7
0.9
Available spares
Set of windows and gaskets
Set of gaskets
Always order spares by using the description given in the
column headed 'Available spares' and state the size and type of
sight glass.
Example: 1 off Set of windows and gaskets for a 1" Spirax Sarco
double window sight glass.
1⁄2"
89
3⁄4"
89
1"
87.5
F
16
32
19
35
24
38
3, 4, 5
4, 5
How to order spares
C
B
Single window
2
A
Size A
B
C
D
E
F
Weight
4
3
5
Double window
1⁄2"
89
-
32
-
32
-
35
-
51
-
51
-
57
64
50
4.8
64
50
4.8
64
50
4.8
73
50
4.8
73
50
4.8
76
50
4.8
0.9
0.9
1.2
1.9
1.8
2.5
3⁄4"
89
1"
89
11⁄4" 108
11⁄2" 108
2"
114
F
Double window
Ensure access is available for maintenance purposes.
Disposal
Recommended tightening torque
D
E
A
D
The product is recyclable. No ecological hazard is anticipated with
disposal of this product providing due care is taken.
How to order
Example: 1 off Spirax Sarco 1" BSP double window sight glass with
brass body and removable toughened soda lime glass.
Item No.
2
Part
Bezel
C
2
C
4
3
5
E
Safety information, installation and maintenance
For full details see the Installation and Maintenance Instructions
(IM-S32-04) supplied with the product.
Warning:
Under certain conditions corrosive elements in condensate can
affect the inside face of the window(s), particularly where caustic
alkali and hydrofluoric acid are present. It is recommended that the
sight glass is periodically checked for thinning of the window(s). If
there is evidence of thinning or erosion damage then the window(s)
should be replaced immediately. Always wear eye protection when
viewing the contents of the sight glass.
Sight glasses should have stop valves fitted on both the inlet and
outlet. It is imperative that the upstream stop valve is closed first in
order to prevent overpressurisation.
Sight glasses can be fitted in either a horizontal or vertical line on
the outlet side of a steam trap. Where the trap is a blast discharge
type e.g. thermodynamic, the sight glass must be fitted at least
1 m from the trap. This is to ensure that the glass is not subjected
to thermal shock or pressure. Reasonable steps should be taken
to protect personnel from injury in the unlikely event that the glass
breaks.
Installation and maintenance note:
5
3
4
N m
60 - 65
TI-P022-05 ST Issue 4
or
mm
Single Window and Double Window Sight Glasses
7.9.2
