DESPITE THE advances in measuring flow and level electronically, a need for visual confirmation often exists in chemical processing. There is no simpler and more-reliable means to verify measurements, witness process steps or observe fluid characteristics than with a sight glass. That's why many process vessels are ordered with sight glasses and others are retrofitted with them. However, the potential failure of sight glass windows is a real concern. In many chemical processing applications, poorly specified or installed sight glasses may pose the greatest risk of leaks and accidents in the system.
展开▼
