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Is It Time to Replace Your Sight Glass? A Complete Guide to Inspection Criteria
Sight glass is a small but essential component in industrial equipment, offering direct visual access to internal processes. Whether in chemical tanks, pipelines, boilers, or pharmaceutical vessels, a clear and functional sight glass is critical for safe and efficient operation. But how do you know when it’s time to replace it?
1. Visible Damage or Cracks
Any crack, chip, or scratch, no matter how small, can weaken the structural integrity of the sight glass. In high-pressure or high-temperature environments, this can lead to sudden failure or even hazardous leaks.
2. Cloudiness or Discoloration
If the sight glass appears foggy, stained, or yellowed, it may be due to long-term exposure to chemicals or thermal cycling. Reduced clarity can impair visibility and may indicate material fatigue or corrosion.
3. Leaks Around Seals
Leaks at the gasket or flange area can signal aging seals or misalignment. Even if the glass itself appears fine, compromised sealing can lead to pressure loss or contamination.
4. Thermal or Pressure Stress
If your equipment experiences frequent temperature changes or high operating pressure, regular inspection is critical. Replace sight glass if there’s any sign of warping, bowing, or looseness.
5. Exceeded Service Life
Manufacturers often specify a recommended service life for sight glass. If yours has been in service for several years under harsh conditions, proactive replacement is wise—even if no obvious damage is present.
Conclusion
Timely replacement of worn or compromised sight glass is vital for maintaining process visibility and equipment safety. Regular inspections and understanding wear indicators can help prevent costly downtime and protect personnel.
