Continental Trade Sp. z o. o.

Armature

Circular sight glasses

We offer frames made by domestic producers and imported frames, made by European producers,  designed to operate at pressures up to 4 MPa. 

Sight glass fittings are circular flanged ports for welding into and onto the vessel wall. The block and the cover flange are screwed together tightly, with the sight glass disk and an independent gasket to the upper and the lower flange respectively positioned between them.  

Accessories 

Can be combined with luminaires  when used in explosion hazardous as well as non explosion hazardous areas. The cover flange is then drilled and tapped to suit luminaire mounting bracket.

Note: After installation, but before putting the fitting into operation, it is necessary to check the weld (tightness, homogeneity), and adherence to the tank shell frame and the tightness of the apparatus according to the requirements of technical inspection.

Circular frames made by domestic producers

Type

Description

2D sketch
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3D
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WO_A

Circular frames for welding

  • Circular pad flange for welding into or onto vessel wall 
  • Complete with gaskets, glass disc and stud/bolts
  • Nominal sizes: DN 15 to DN 200
  • Viewing diameter: 30 to 220 mm
  • Materials: stainless, carbon steels and specials

 

Circular sight glass fitting type WO is available in two variants:
- type WO_A - with ends (tubes) for welding,
- type WO_B - without welding ends, welded is lower frame.

Type WO_A - with welding end (tube)
Circular frame with welding end type WO_A

Circular frame for welding with welding end - Type WO_A

WO circular - ver. A - 3D view

WO circular - ver. A - 3D section view

WO_B Type WO_B - without welding end
Circular frame with welding end type WO_B
Circular frame for welding - type WO_B

WO circular - ver. B - 3D animation

 

Note: for corrosive media or steam, as well as at high temperatures, it is recommended to use mica shields on the glass viewing window.

 

Circular frames made by European producers

Type

Description

2D sketch
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3D
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317

Round Sight Glass for welding, no pressure retaining, DIN 28120

  • Pressureless operation (ΔP ≤1 bar)
  • Temperature1): up to 243 °C
  • Nominal sizes: DN 50 to DN 200
  • Pressure: 0 bar
  • Similar to DIN 28 120

Round Sight Glass type 317 for welding

Sight Glass Fitting, circular DIN 28120 or similar Round Sight Glass type 317 for welding
318

Round Sight Glass for welding, PN 2.5, DIN 28120

  • Temperature1): up to 280 °C
  • Nominal sizes: DN 25 to DN 200
  • Pressure: up to 2.5 bar
  • Similar to DIN 28 120
  • Light construction
Round Sight Glass type 318 for welding Round Sight Glass type 318 for welding Round Sight Glass type 318 for welding
318V

Round Sight Glass for welding, PN 2.5, vacuum version, DIN 28120

  • Temperature1): up to 280 °C
  • Nominal sizes: DN 25 to DN 200
  • Pressure: from -1 up to 2,5 bar
  • Similar to DIN 28 120
  • An O-ring seal makes 318V perfectly capable of vacuum applications
 Round Sight Glass type 318V for welding  Round Sight Glass type 318V for welding  n.a.
319

Round Sight Glass for welding, PN 6, DIN 28120

  • Temperature1): up to 280 °C
  • Nominal sizes: DN 50 to DN 200
  • Pressure: up to 6 bar
  • Similar to DIN 28 120
Round Sight Glass type 319 for welding Round Sight Glass type 319 for welding Round Sight Glass type 319 for welding
320 Round Sight Glass for welding, PN 16, DIN 28120
  • Temperature1): up to 280 °C
  • Nominal sizes: DN 25 to DN 250
  • Pressure: up to 16 bar (for DN 200 & DN 250 up to 10 bar) 
  • Similar to DIN 28 120
Round Sight Glass type 320 for welding Round Sight Glass type 320 for welding Round Sight Glass type 320 for welding
321 Round Sight Glass for welding, metal to metal contact seal, DIN 28120
  • Temperature1): up to 200 °C
  • Nominal sizes: DN 40 to DN 200
  • Pressure: 10 bar or 25 bar
  • Similar to DIN 28 120
Round Sight Glass type 321 for welding Round Sight Glass type 321 for welding Round Sight Glass type 321 for welding
322

Round Sight Glass, High Pressure construction

  • Temperature1): up to 280 °C
  • Nominal sizes: DN 40 to DN 200
  • Pressure: 40, 63, 100 or 160 bar
 Round Sight Glass type 322, High Pressure construction Round Sight Glass type 322, High Pressure construction Round Sight Glass type 322, High Pressure construction
327

Screwed Sight Glass, pipe thread, DIN 11851

  • Temperature: up to 220 °C (depending on seal)
  • Nominal sizes: DN 25 to DN 150
  • Pressure: 6 bar
  • Vacuum: 1.3mbar
  • Similar to DIN 11 851
  • often used in food, brewery, pharmacy etc. application,
  • can be sterilized
Screwed Sight Glass type 327 DIN 11851 Screwed Sight Glass type 327 DIN 11851 n.a.
390

Sight Glass, flange type, for welding

  • Temperature1): up to 500 °C
  • Nominal sizes: DN 25 to DN 350
  • Pressure: 16, 25, or 40 bar
Sight glass type 390 Sight glass type 390 Sight glass type 390
390V

Vacuum Sight Glass, flange type, for welding

  • Temperature1): up to 280 °C
  • Nominal sizes: DN 25 to DN 350
  • Pressure: from -1 to 16 bar
Vacuum Sight glass type 390V Vacuum sight glass flange version for welding n.a.
391

Sight Glass Flange, with pipe adapter

  • Temperature1): up to 500 °C
  • Nominal sizes: DN 25 to DN 350
  • Pressure: depending on the version
  • For welding on existing pipes
Sight glass type 391 Sight glass flange with pipe adapter Sight glass type 391
392

Sight Glass with thread connection (BSP)

  • Temperature1): up to 500 °C
  • Nominal sizes: DN 25 to DN 100
  • Pressure: 16 bar
  • For gases and liquids, for special applications.
Sight glass type 392 Sight glass type 392 n.a.
393

Sight Glass flange, ANSI slip on flange version

  • Temperature1): up to 500 °C
  • All length acc. to ANSI standard
  • Suitable for T-junctions or pipe sockets.
  • For gases and liquids, for special applications.
Sight glass 393, ANSI standard Sight glass type 393, ANSI standard n.a.

1) depending on glass type (sodalime: 150°C, borosilicate 280°C, quartzglass 500°C)

Note: for corrosive media or steam, as well as at high temperatures, it is recommended to use mica shields on the glass viewing window.

Note: for corrosive media or steam, as well as at high temperatures, it is recommended to use mica shields on the glass viewing window.

Description

2D sketch
(click to expand)
PDF
info
Picture

Sight Glass Fitting, circular DIN 28120 or similar

  • Circular pad flange for welding into or onto vessel wall
  • Complete with gaskets, glass disc and stud/bolts
  • Nominal sizes: DN 50 to DN 200
  • Viewing diameter: 80 to 225 mm
  • Materials: stainless, carbon steels and specials
Sight Glass Fitting, circular DIN 28120 or similar Sight Glass Fitting, circular DIN 28120 or similar Sight Glass Fitting, circular DIN 28120 or similar

Sight Glass Fitting, circular, stainless steel, for non-pressurized vessels

  • Light weight low profile fitting for atmospheric vessels (over the standard DIN 28120 format) for welding into or onto vessel wall
  • Smaller outer diameter and cost effective alternative to DIN 28120
  • Complete with gaskets, glass disc and screws
  • Nominal sizes: DN 50 to DN 200
  • Viewing diameter: 80 to 225 mm, operating pressure 1 or 2 bar
  • Materials: stainless, carbon steels and specials
Sight Glass Fitting, circular, stainless steel, for non-pressurized vessels Sight Glass Fitting, circular, stainless steel, for non-pressurized vessels Sight Glass Fitting, circular, stainless steel, for non-pressurized vessels

Sight Glass Fitting, circular DIN 28121, PN10/25

  • Circular flange assembly for bolting straight onto weld pad/nozzle flange
  • Complete with fully gasketed glass disc
  • Nominal sizes: DN 40 to DN 200
  • Viewing diameter: 48 to 150 mm
  • Materials: stainless, carbon steels and specials
Sight Glass Fitting, circular DIN 28121, PN10/25 Sight Glass Fitting, circular DIN 28121, PN10/25 Sight Glass Fitting, circular DIN 28121, PN10/25

Double Glass Safety Sight Glass Fitting

  • Circular flange assembly ready for bolting straight onto weld pad/nozzle flange
  • Glass discs separated by spacer ring and independet seals
  • If damage occurs to one disc, the other maintains service under full operating conditions. Nominal sizes: DN 50 to DN 200
  • Viewing diameter: 50 to 175 mm
  • Materials: stainless, carbon steels and specials
  • Also available with inter glass heating
Double Glass Safety Sight Glass Fitting Double Glass Safety Sight Glass Fitting Double Glass Safety Sight Glass Fitting

Screwed Sight Glass Fitting MV
DIN 11851 for welding into or onto vessel wall

  • Complete with glass disc, gaskets and slotted cover nut
  • Nominal sizes: DN 50 to DN 150
  • Viewing diameter: 50 to 150 mm
  • Materials: stainless and special steels
Screwed Sight Glass Fitting MV Screwed Sight Glass Fitting MV Screwed Sight Glass Fitting MV

Aseptic Screwed Sight Glass Fitting MV-S

  • Similar to DIN 11864-1
  • Screwed sight glass fitting with metalfused sight glass for aseptic use
Aseptic Screwed Sight Glass Fitting MV-S Aseptic Screwed Sight Glass Fitting MV-S Aseptic Screwed Sight Glass Fitting MV-S

Additional information for circular frames

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