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Special Features for Sight Glasses0 pages
2 7/8˝
(73 mm)
2 3/8˝
(60 mm)
SPECIAL4˝
FEATURES FOR SIGHTGLASSES
MAX LEVEL
(102mm)
Series NW
EVEL
CURVED SIGHTGLASS
Size
The lower flange of the Series NW
sightglass can be provided with a
cylindrical or spherical curve to match the
vessel or pipe it is being welded to. This
eliminates the need for expensive saddles
or special nozzles.
E=R- R -(B/2)
1 1/16˝
(27mm)
A
D
MM
1 3/16
30
19
1 3/16
7 1/8˝
(181mm)
30
3/4
NW100-R
2
Inches
19
3/4
1/2
NW80-R
MM
3/4
1/4
NW50-R
L
2
B
MIN LEVEL C
Inches
MM
Inches
MM
Inches
3 3˝ CLASS 178
83
7
4
102
7
150 R.F. 191
5
127
9
FLANGE 229
6
152
10
254
6
175
111 13/16˝
279
8
224
13
343
(46mm)
MAX LEVEL
L
19
1 3/16
30
19
1
7/16
37
7/16
3/4
NW125-R
7/8
NW150-R
13/16
NW200-R
19
1
13/16
1/2
21
1 7/16
A
EVEL
7371/2˝
A
37
(191mm)
3/4
C
L
7 7/8˝
(200mm)
D
MIN LEVEL
ASS
.F.
-2PLS
E
B
R (CYLINDRICAL OR
SPHERICAL RADIUS)
2 7/8˝
(73 mm)
6˝
DOUBLE WINDOW SIGHTGLASS
A
(152mm)
B
The double window assembly offers the user
an extra layer of reliability by controlling the
factors which cause a lens to fail.
If a lens fails, the cause can, in most instances,
be traced to one or a combination of the following
factors: a stress concentration, thermal stress or
shock, erosion or corrosion, and mechanical damage.
The double window design provides
extra protection against these causes of failure.
All sizes except NW150-DW and NW200-DW are
rated standard for 150 PSIG (10.3 Barg) pressure and
full vacuum at 300°F (149°C) temperature. NW150DW and NW200-DW are rated for 125
PSIG (8.6 Barg) pressure at 300°F (149°C)
temperature. Higher pressure and temperature ratings
are available upon request.
D
C
Length of indication (L) Plus 9.625˝
Submerged float length
D
C
B
A
Size
Inches
MM
Inches
MM
Inches
MM
Inches
MM
NW50-DW
43/8
111
31/4
83
17/8
48
3/8
10
NW80-DW
1/16
10
5
129
4
NW100-DW
6
3/8
162
5
NW125-DW
73/8
187
6
NW150-DW
3/8
213
7/8
NW200-DW
8
107/16
265
6
813/16
48
3/8
127
15/16
1
49
7/16
11
152
115/16
49
7/16
11
13
13
102
7/8
1˝ (25mm)
Bottom o
tank
SIGHTGLASSES
6˝
m)
(27mm)
1
175
2
51
1/2
224
23/8
60
1/2
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