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There are two types of vessel sight glass: a conventional glass disc sandwiched between two gasketed metal rings, and glass fused to a metal ring during manufacturing. In addition, the metal ring takes the stress of mounting, which allows the sight glass window to be returned to service after removal for cleaning&#;a practice not advised for glass discs. A conventional sight glass assembly is fine for low-pressure non-critical applications.Fused sight glass windows are recommended in critical and high performance applications. Glass typically fails under tension. With fused sight glass windows, the compressive force of the metal ring exceeds the tensional force (i.e., pressure) and, as a result, the sight glass is extremely resistant to failure. Fused sight glass windows offer high pressure ratings and high safety margins.
The glass materials selected, the unsupported diameter, and the glass thickness all play a role in determining the pressure capabilities of a sight glass. The pressure ratings are indicated on the product datasheet.
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Most of our sight glasses are available with either common soda lime glass (for temperatures below 300&#; F) or borosilicate glass (for temperatures up to 600&#; F.) Borosilicate glass is more resistant to thermal shock than soda lime glass, and should be specified in areas where hot equipment may experience washdowns with cool water. Quartz or sapphire glass is recommended for temperatures greater than 600&#; F, such as in high temperature steam applications. Mica shields are available for extreme applications.
Stainless steel offers corrosion resistance and is standard in pharmaceutical applications. 316 stainless steel is most common, with other steel grades often available by special order. Our popular METAGLAS® brand sight windows are made of duplex stainless steel, a formula that is particularly corrosion resistant.
Corrosive and abrasive process media can cause glass to become hazy. In such cases a borosilicate glass will perform better than soda lime glass.
This doesn&#;t really affect selection, as all sight glasses are available with a wide variety of gaskets. Just be sure that the gasket material selected is compatible with your process media and temperature.
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