Circular Sight Glass Fitting Type 391 - PN16 - PN 4
with pipe adapter for welding onto pipelines
Sight Glass Fitting Type 391
The ACI Type 391 is a round tank sight glass with a pipe adapter intended for welded installation on an existing pipe or small pressure vessels.
As with our other sightglasses, a sightglass made of chemically highly resistant borosilicate glass to DIN 7080 or similar is clamped between two high-quality stainless steel flanges and proven quality gaskets.
Our type 391 sight glasses are made of the high-quality stainless steel 1.4571 (316Ti) that our customers have appreciated for years. The glass material used is borosilicate glass 3.3 according to DIN 7080 (or similar), which has proven itself in the industry.
The fitting is sealed with flat gaskets adapted to your requirements from an extensive range of materials. In addition to the widely used fiber gaskets (e.g. KLINGERSIL® C-4400), PTFE (Garlock GYLON®, Frenzelit novaflon®), NBR, graphite (e.g. Frenzelit novaphit®) and many other branded gaskets are available for special applications.
You can find more information about gasket materials in our Help Center.
If the maximum operating temperature of 280°C does not meet your requirements, or if process conditions pose a problem even for the highly resistant borosilicate glass, an FEP or mica protection screen specially adapted to the fitting offers additional protection against steam and aggressive chemicals, such as alkalis up to a pH value of 14.
As with other of our sightglass fittings, our Type 391 can be optionally equipped with SGW type wipers or lights.
More technical details about our sightglass fitting type 391 can be found further down this page!
² depending on environmental variables
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)
L = acc. to order (Standard: L = 70 mm)
D = Nominal size of the medium-carrying pipeline / vessel
|PN||DN||Da [mm]||Di [mm]||A [mm]||s [mm]||Weight [kg] *|
|200 (PS max. 10 bar(g))||340||207||219,1||6,3||28,2|
|300 (PS max. 6 bar(g))||460||310||232,9||7,1||55,7|
|350 (PS max. 6 bar(g))||520||340||355,6||8||78|
|25 / 40||100||235||107||114,3||3,6||14,8 (PN 40)|
|125||270||132||139,7||4||21,1 (PN 40)|
|150||300||160||168,3||4,5||27,5 (PN 40)|
|200||375||207||219,1||6,3||52,6 (PN 40)|
* Weight depending on size of D