391 Sight Glass Flange With Pipe Adapter For welding on existing pipes PN16, PN40
The ACI Type 391 is a round tank sight glass with a pipe adapter designed for welded installation on an existing pipe or small pressure vessels.
Our Type 391 sight glasses are crafted from the high-quality stainless steel 1.4571 (316Ti) that our customers have valued for years. The glass material used is borosilicate glass 3.3 according to DIN 7080 (or similar), a material proven in the industry.
The fitting is sealed with flat gaskets customized to your requirements from an extensive range of materials. In addition to 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.
If the maximum operating temperature of 280°C does not meet your requirements or if process conditions pose challenges for the highly resistant borosilicate glass, an FEP or mica protection screen specially adapted to the fitting provides additional defense against steam and aggressive chemicals, including alkalis up to a pH value of 14.
Similar to other of our sight glass fittings, our Type 391 can be optionally equipped with SGW type wipers or lights.
