Type 318 - PN 2,5 | Circular sight glass | ACI Industriearmaturen GmbH

Circular Sight Glass Fittings Type 318 - PN 2,5

Lightweight design

Tank Sight Glass Type 318

Our round tank sight glasses type 318 (PN 2.5) are welded onto or into a vessel wall to allow observation or illumination of the inside of the vessel. ACI tank sight glasses type 318 are designed for an operating pressure of 2.5 bar(g), based on DIN 28120. A sight glass made of chemically highly resistant borosilicate glass DIN 7080 (or similar) is clamped between two high-quality stainless steel flanges and proven quality seals.

Exploded_view_type_318_with_labelling_of_the_individual_parts

Compared to the design provided for in DIN 28120, our type 318 is significantly flatter and lighter. The type 318 is a cost-efficient alternative for low operating pressures and therefore perfectly fills the application range between our type 317 for unpressurised operation and the more solid type 320 variant.

Despite the lower requirements, compared to DIN 28120, our tank sight glasses of type 318 are made of the same high-quality stainless steel 1.4571 (316Ti) that our customers have appreciated for years. The glass material used is borosilicate glass 3.3 to DIN 7080 (or similar), which has proven itself in the industry. The sealing of the fitting is done with flat gaskets adapted to your needs from an extensive range of materials, which, in addition to the common fibre gaskets, also offers more demanding materials such as PTFE (Teflon®), NBR, graphite and many branded gaskets.

If the maximum operating temperature of 280°C does not meet your requirements, or if the process conditions pose a problem even for the highly resistant borosilicate glass, an FEP or mica protective screen specially adapted for the fitting offers additional protection against steam and aggressive chemicals, such as alkalis up to a pH value of 14.

Like other of our sightglass fittings, the type 318 can be equipped with wiper type SGW, spray devices or lights on request.

More technical details about our tank sight glass type 318 - PN 2.5 can be found further down this page!

Technical details

Flange material:

  • Base flange:
    1.4571 (factory standard)
  • Cover flange:
    1.4541 (factory standard)
  • Other materials on request ¹

Shape:

  • similar to DIN 28120 but as lighweight design
    up to 2,5 bar(g)

Temperature:

  • up to 280 °C with borosilicate glass
    according or similar to DIN 7080
  • up to 150 °C with soda-lime glass
    according or similar to DIN 8902
  • up to 400 °C with untempered borosilcate glass

Sight glass:

  • Boroslicate glass DIN 7080 or similar
  • Borosilcate glass untempered 

Nominal size:

  • DN 50 up to DN 400

Options:

  • Wiper SGW with PTFE or silicone wiper blade
  • LED lights for EX- and Non-EX-areas
  • Spray device SVI
  • FEP protective screen (for higher pH-values)
  • special desgins are possible 

Gaskets:

  • KlingerSil® C4400
  • PTFE, FKM, NBR, Silikon, EPDM
  • Graphit 
  • or according to customer requirements

Nominal pressure:

  • PN 2,5

Screws:

  • A4-70

¹ Optional materials:

1.0460 / 1.4301 / 1.4307 (F304L) / 1.4404 (F316L) / 1.4410 (Super Duplex) / 1.4435 (F316L) / 1.4462 (F 51) / 1.4529 (Alloy 926) / 1.4539 (Alloy 904L) / 1.4541 (F321) / 1.4547 (F44) / 1.4550 (F347) / 1.4571 (316Ti) / 1.4828 / 1.4841 / 1.4876 ( Alloy 800H) / 1.4878 / 1.7335 / 2.4068 (Alloy 201) / 2.4360 (Alloy 400) / 2.4375 (Alloy K500) / 2.4602 (Alloy C-22) / 2.4605 (Alloy 59) / 2.4610 (Alloy C-4) / 2.4816 (Alloy 600) / 2.4819 (Alloy C-276) / 2.4856 (Alloy 625) / 2.4858 (Alloy 825) / 3.7035 (Titan)

Section_view_type_318
DN 50 80 100 125 150 200 300 400
Da [mm] 150 175 200 220 250 300 400 500
Di [mm] 80 100 125 150 175 225 305 390
h1 [mm] 12 14 14 16 16 16 20 22
h2 [mm] 24 24 24 24 24 24 24 24
Weight [kg] 3,6 5 5,9 7,1 8,8 11,3 21,7 35
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Type 318 - PN 2,5 | Circular sight glass
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