Sight Glass Flow Indicators

Sight glass flow indicators are the simplest way to monitor the flow of fluids or gases in pipelines. With a glance, you can see the movement, presence, colour, and clarity of fluids or gases in real-time. These simple devices can enhance your operations with a wide range of applications.

Industrial applications of sight glass flow indicators

A sight flow indicator can be utilised in any industry where a quick check of the flow of fluids or gases in the pipeline is beneficial. You can use them for:

  • Process Control: Use them to monitor and control processes in multiple industries, from chemical manufacturing to power generation.
  • Troubleshooting: Operators can use sight glass flow indicators to identify issues such as blockages, air bubbles, or irregular flow patterns within the system.
  • Safety Checks: By visually inspecting the flow, you can detect any abnormalities indicating potential problems or unsafe conditions.

Additionally, sight glass flow indicators do not require penetration into the system, thereby minimising the risk of leaks or contamination. You can also install them into existing pipelines without significantly modifying the system. 

Our range of sight glasses

At Hawleys, we stock two kinds of sight glass materials: bronze and ductile iron. Built for durability and performance, these materials are ideal for high-pressure and high-temperature applications across industrial, plumbing, and process control settings. But what’s the difference?

Bronze sight glasses 

Bronze sight glass flow indicators offer a diverse range of applications. The alloy's corrosion resistance ensures longevity, maintaining the indicator's integrity over time, even in environments with moisture or aggressive substances. 

Bronze's inherent strength and durability suit applications exposed to physical stress or pressure. The material's high-temperature resistance allows for reliable performance in elevated temperature settings. These sight glasses provide a versatile solution compatible with various fluids, and their machinability enables intricate designs.

Ductile iron sight glasses 

Ductile iron sight glasses are another robust solution for a variety of industrial applications. Crafted from a ductile iron alloy, they boast enhanced strength and toughness, ensuring resistance to mechanical stresses and impacts. 

The sight glasses are corrosion-resistant, and the material's ductility allows for significant deformation without breakage. Ductile iron's ability to withstand various temperatures makes these sight glasses versatile for applications encountering varying thermal conditions.

Note: As with any sight glass flow indicator, properly considering the material's compatibility with the fluid and environmental conditions is essential.

Buy sight glass flow indicators online

At Hawleys, you can order your preferred sight glass flow indicator online, and we will dispatch it the same day. The flow indicator comes with the full manufacturer’s warranty, and if you can’t apply it to your system, you can return it within 30 days. Take a look at our returns policy to see how it works. Feel free to contact us if you have any additional questions about our products.

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FAQs

  • How do I choose the right sight glass for my system?

    Consider your system’s operating pressure, temperature, fluid type being monitored, and pipe size. You’ll also need to decide between threaded or flanged connections and whether you need a simple flow indicator or one with moving parts (e.g., a rotor or flapper) for better visual feedback. Contact us for more information and advice—we can help you find the right sight glasses for your requirements.

  • Do sight glasses require maintenance?

    Yes, regular inspection is important. Check the glass for cloudiness, cracks, or residue buildup. If visibility is reduced, clean or replace the glass. Also, ensure seals and gaskets remain intact to avoid leaks.

  • Can I use a brass sight glass in steam applications?

    Brass is generally not recommended for high-temperature steam due to its lower strength at elevated temperatures. Bronze or ductile iron sight glasses are a better choice for steam applications, especially when paired with a pigtail syphon to protect the glass from direct heat.

  • Where can I find replacement parts or accessories?

    We stock a range of replacement glasses, gaskets, and mounting components. If you need help sourcing a specific part or confirming compatibility, contact our team, and we’ll help you find the right match from our supply.

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