` Metaglas® Threaded Sight Glass - Alpha Controls & Instrumentation Inc.

L.J. Star

Metaglas® Threaded Sight Glass

The strongest, most secure sight glass elements, available in a threaded design for process applications

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$256.00 CAD
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The strongest, most secure sight glass elements available, Metaglas® mechanically prestressed windows, are available in a threaded design for process applications. Metaglas threaded sight glasses are compliant with the recently revised ASME (founded as the American Society of Mechanical Engineers) standard for electric boilers, Section I PEB-13, Water Gages. The revised ASME standard now allows manufacturers of boilers with a diameter of 16 in or smaller to use a bull’s-eye-type fused sight glass window instead of the traditional tubular sight glass for observation of the water level in the boiler.

These sightglass are available in variety of thread type including NPT and metric straight threads. Described as offering the optics of glass and the strength of steel, these glass elements provide a level of safety, and a useful service life, well beyond that provided by conventional tempered glass or plastic in sanitary service. Even at the most extreme temperatures (as high as 536°F) or in overpressure situations, sudden, total failure – that involving leakage or explosive shattering of the glass – essentially never occurs.
 

• Mounting: Male NPT Connection
• Glass: Borosilicate to DIN7080
• Metal: Stainless steel, Carbon steel, or Hastelloy
• Up to 572°F
• 1/4 in– 2 in; 100 Bar, 1450 PSI
• 3 in; 50 Bar, 725 PSI
• Sizes: 1/4 in – 3 in

d2 Thread

SW

d1

d4

I

I1

1/4 in NPT

21 mm

9 mm

9 mm

17 mm

11 mm

3/8 in NPT

24 mm

10 mm

12 mm

20 mm

13 mm

1/2 in NPT

27 mm

14 mm

16 mm

25 mm

15 mm

3/4 in NPT

36 mm

18 mm

20 mm

26 mm

16 mm

1 in NPT

41 mm

21 mm

23 mm

34 mm

19 mm

1-1/4 in NPT

50 mm

25 mm

30 mm

30 mm

20 mm

1-1/2 in NPT

55 mm

30 mm

36 mm

36 mm

24 mm

2 in NPT

70 mm

35 mm

44 mm

40 mm

25 mm

3 in NPT

100 mm

50 mm

60 mm

50 mm

30 mm