Sight Glass: Purpose and Maintenance Guide
Le but d'un sverre clair est de permettre aux directeurs d'usine et aux ingénieurs d'examiner l'intérieur de leurs systèmes sans perturber l'environnement qui s'y trouve. Souvent appelés lunettes de visualisation, elles vous offrent un moyen de voir les niveaux de liquides ou de gaz qui traversent un point critique de votre conception, de surveiller les changements de pression et pratiquement tout ce que les fenêtres de visualisation pourraient vous permettre de faire. Avec leur utilisation généralisée, les voyants sont devenus essentiels aux opérations telles que les pipelines de vapeur, le traitement chimique, le traitement pharmaceutique et la transformation alimentaire.
Le pipeline lunette de vue est l'un des principaux accessoires du dispositif de pipeline industriel. Il peut observer à tout moment la réaction d'écoulement du gaz, du liquide, de la vapeur et d'autres médias dans le tuyau, surveiller la production et éviter les accidents dans le processus de production. Souvent utilisé dans les pipelines de production de produits chimiques, de fibres chimiques, de pétrole, de produits pharmaceutiques et autres.
Réparation et entretien de miroir de tuyau
- Le voyant est utilisé pour observer le flux de gaz, de liquides, de vapeur et d'autres équipements de réaction, sa vitre doit être maintenue propre sans poussière ;
- Le voyant du miroir appartient à la pièce endommagée appropriée, qui doit être manipulée avec soin lors de l'installation du miroir ;
- There are some limitations in the temperature and pressure resistance of Sight Glass.
china stainless steel sight glass manufacture
Introduction
UN lunette de vue is a transparent window installed in tanks, pipelines, and industrial equipment to allow visual monitoring of fluid levels, flow, and process conditions. Commonly used in chemical plants, oil refineries, power generation, and food processing, sight glasses ensure safe and efficient operations.
In this blog, we’ll cover:
✔ Key Purposes of a Sight Glass
✔ Types of Sight Glasses
✔ Maintenance Best Practices
Purpose of a Sight Glass
1. Visual Process Monitoring
Allows operators to check liquid levels, flow rates, and fluid clarity without opening the system.
Essential for boilers, reactors, and storage tanks.
2. Safety & Leak Detection
Helps detect contamination, phase separation, or gas bubbles in pipelines.
Prevents overfilling or dry-running of pumps.
3. Quality Control in Sanitary Industries
Used in pharmaceutical, food, and beverage industries to ensure hygienic conditions.
Complies with FDA, EHEDG, and 3-A standards.
4. Pressure & Temperature Indication
Some sight glasses include pressure-resistant glass (borosilicate) for high-P/T applications.
Types of Sight Glasses
| Taper | Application |
|---|---|
| Flanged Sight Glass | High-pressure systems (steam, chemicals) |
| Tubular Sight Glass | Liquid level indication in tanks |
| Reflex Sight Glass | Distinguishes liquid/gas phases (e.g., fuel tanks) |
| Illuminated Sight Glass | Low-light environments (pharma, labs) |
| Circular Window Sight Glass | Small inspection points (pumps, filters) |
Sight Glass Maintenance Instructions
Proper maintenance ensures longevity, safety, and accuracy. Follow these steps:
1. Regular Inspection
Check for cracks, cloudiness, or leaks around the seal.
Replace damaged glass immediately to prevent ruptures.
2. Cleaning Procedures
Use non-abrasive cleaners (isopropyl alcohol for grease, mild detergent for general cleaning).
Avoid scratching the glass—use soft cloths or sponges.
Pour sanitary industries, follow CIP (Clean-in-Place) protocols.
3. Seal & Gasket Maintenance
Inspect O-rings, gaskets, and sealing surfaces for wear.
Replace if hardened, cracked, or deformed.
Use compatible materials (EPDM, Viton, PTFE) for chemical resistance.
4. Pressure & Temperature Checks
Ensure the sight glass is rated for the system’s max P/T.
Avoid thermal shock—gradually heat/cool the system.
5. Preventing Condensation & Fogging
Use heated sight glasses or anti-fog coatings in humid environments.
6. Safe Handling During Replacement
Isolate the system and depressurize before removal.
Use protective gloves and goggles when handling broken glass.
When to Replace a Sight Glass?
Visible cracks or chips
Persistent leaks (even after seal replacement)
Discoloration or cloudiness obstructing visibility
Failed pressure tests
Conclusion
UN lunette de vue is a simple yet vital component for process monitoring, safety, and efficiency. Proper inspection, cleaning, and seal maintenance can extend its lifespan and prevent failures.
Need help selecting or maintaining a sight glass? Consult an expert to ensure optimal performance in your application!
