Pressure vessel sight glasses

US4877668A · kind A · utility

Assignee

• Schott Glaswerke · DE

Inventors

• Paul Hinz · Ingelheim am Rhein, DE
• Helmut Dislich · Budenheim, DE
• Gerhard Weber · Landsberg am Lech, DE

Key dates

• Filing date: Jan 20, 1987
• Grant date: Oct 31, 1989
• Expiry date: Jan 20, 2007

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/239
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A pressure vessel sight glass, especially a tempered glass, is protected against the corrosive attack of normally alkaline, boiler feed water heated up to 300.degree. C., by providing the sight glass with a metallic oxide coating consisting essentially of SnO.sub.2, optionally combined with Cr.sub.2 O.sub.3. The coating is preferably applied as a sprayed solution of soluble salt convertible to the oxide.