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Circular Sight Glass Fittings Series to DIN28120 or similar

with METAGLAS® sight glass

Sight glass fitting DIN 28120 with METAGLAS® sight glass Type 73

Applications

  • Weld-on Sight glass fittings for the observation of the internals of pressure, silos, gear trains, separators, pipelines, etc.

Operating conditions

  • Pressure: 10 bar or 16 bar, depending on size, higher pressure rating on request). For temperature rating (depending on material selection)
  • Vacuum

Operating temperature

  • max. 280°C – Borosilicate glass DIN7080
  • max. 150°C – Sodalime glass DIN8902
  • max. 500°C – fused quartz glass

Assembly

  • After welding base flange onto or into vessel wall, seals, glass disc and flange are placed together in the order shown. Then the nuts (in case of studded base flange) and washers are progressively tightened, always working on diametrically opposted pairs of nuts at time. Tightening torque values are given in table on overleaf. Other information can be taken from DIN28120.

Note

  • The operating safety of sight glass plates depends very much on their installation (e.g. no scratches) (instructions according to DIN7080). For metal fused sight glasses, this is not entirely true, because the force of the bolts is transmitted via the metal ring of the mating flange.

Material certificate

  • Stainless Steel: 1.4571 (316TI), 1.4541,
    Carbon Steel ST37.2
    other Materials on request
 

parts

materials

base flange

steel Rst 37-2,
stainless steel 1.4571 or s.

seals

Klingersil C-4400 on demand
(on both sides of the sight glass)

sight glass disc

   Borosilicate glass DIN 7080

   Sodalime glass DIN 8902

   METAGLAS® DIN 7079
   Hoest-Werknorm 70-0099 Teil 2
   (see note)

cover flange

steel Rst 37-2,
stainless steel 1.4571 or s.

securing bolts

steel 5.6 or A2-70
respectively A4-70

 Nominal size

 

Sight glass

Flange

 

Securing bolts

Seals

Locked torque

DN

PN

d1

d2

s

d

k

h1

h2

No.

 Size

 d3

 d1

d7

  Nm

50

10/16

 80

100

15/15

165

125

16/16

30

4

M16

18

80

102

28/32

80

10/16

100

125

15/20

200

160

20/20

30

8

M16

18

10

127

20/23

100

10/16

125

150

20/20/25

220

180

18/22/22

30

8

M16

18

125

152

() 26/30

125

10/16

150

175

20/20/25

250

210

18/25/5

30

8

M16

18

150

177

() 32/34

150

10/16

175

200

20/25/30

285

240

18/30/30

36

8

M20

22

175

202

() 47/54

200

10

225

250

25/30

340

295

20/35

36

8

M20

22

225

252

() 63