Circular Sight Glass Fittings Type 318 - PN 2,5
Lightweight design for max. 2,5 barg
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.
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:
| Shape:
| Temperature:
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Sight glass:
| Nominal size:
| Options:
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Gaskets:
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Screws:
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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) | ||
| 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 |
