BCST double window sight glass is designed to provide the means of visual inspection for process operations and plant protection. This allows the operator to view the immediate flow and monitor the color and condition of pipeline applications. It is a simple assembly of two glasses on a single cast on two opposite sides. These flow indicators are used for spot inspections and in the visualization of process parameters. It is available with various thicknesses and diameters of glass to suit multiple applications concerning fluid pressure and temperature. It is effortless to replace glass in a double window without dismantling the whole sight glass assembly from the process line. In addition, it gives better performance in applications with higher pressure and temperature. With their widespread use, sight glasses have become critical to steam pipelines, chemical processing, pharmaceutical processing, and food processing. Beyond these applications, sight glasses can be helpful anywhere that you wish to see inside your equipment.

What are the types of double window sight glass?

Double window sight glass is to be had in many types; you may select one in line with your requirement. Here are a few styles of the double window sight glass.

• Plain kind double window sight glass
• Drip tube kind double window sight glass  
• Flapper kind double window sight glass
• Rotor kind double window sight glass
• Ball-kind double window sight glass
• Circular-flange double window sight glass.

Plane double window sight glass: 

You can use this double window sight glass while you want to manipulate the fluids and gases in pipelines. This kind of double window sight glass may contain an internal flap, and you should take care of the flow direction when installing this double window sight glass. This kind of double window sight glass will allow you to check the colour and clarity of fluid inside the valve with the help of the window. It contains a body with two windows, which you can use to view the process inside the valve. Drip tube kind double window sight glass: Drip tube type double window sight glass is a device composed of two glasses fitted on opposite sides. Its body looks like a cross, and it has two sides flanges. You can inspect the fluid flowing through the valve with the help of a glass window. This double window sight glass can carry out higher vibration, pressure, and temperature conditions. You can use it in power plants, chemical, textile, and pharmaceutical industries. The best thing about this double window sight glass is its low cost and medium weight.

Flapper kind double window sight glass:

This kind of double window sight glass is a mechanical device placed in the fluid when the process in the system is working and the liquid is flowing. Then this device will start to move and show the movement and speed of fluid inside the system.

Rotor type double window sight glass:

You can use This kind of double window sight glass to control the flow. It is composed of rotors, which move in a circular position because of the flow. The speed of the rotors will tell you about the flow rate in the pipe.

Ball-kind of double window sight glass:

This type of in this kind of double window sight glass is composed of a ball. The ball moves from the bottom to the top of the double window sight glass when the flow progresses. You can see the ball from the window and observe the flow very quickly because of the window. The movement of the ball because of fluid will tell you about the presence of flow. Usually, the different industries use this kind of double window sight glass in slow-moving liquids and gases.

Circular flange type double window sight glass:

  Many use tanks and reactors which need a round-shaped flange connection. And if you want to inspect the process in the tank or the boiler, then you need flanged type double window sight glass for this purpose, and you will fit this flanged double window sight glass on the flanged connection. It is straightforward to install and has a gasket cut to an inner flange bolt circle for easy centring.

What is the design and testing international standard of double window sight glass?

Level of Design	ASME B 16.34
Checking and testing standard	BS EN ISO 12266-I(BS 6755-I)/API 598/ISO5208
Distance of one Flange to other flanges	As per DIN EN 558-1
End of  connection	Flanged End to ANSI B 16.5, class 150 BS 10 Table D/E/F PN6/PN 10/PN 16/PN 25 DIN standard /JIS standard/IS standard
production size range	1”(DN25) to12”(DN300)
The pressure rating of the valve	150# PN10/PN16

What is the material that is used in the double window sight glass?

You should be aware of the material used in your double window sight glass device so that you will know that your double window sight glass is compatible with your system. Generally, a double window sight glass is composed of a metal gas kit and glass.

Metallic material:

Usually, a double window sight glass is composed of carbon steel and stainless steel materials. You can consider Stainless steel can as the best in the case of pharmaceutical industries, as it gives better resistance to corrosion.

Gaskets material:

You must ensure that the material used in your gasket is compatible with the system. Typically, gaskets are made up of enhanced PF material or Teflon. So the main thing essential for the excellent performance of double window sight glass is the gasket.

Glass material:

If you work with a temperature less than 300-degree F, you will use soda glass. And if you are working with a temperature of 300-degree F to 500-degree F, then you will use borosilicate type glass; this kind of glass can also be used when the temperature is below 300-degree F. And if you are working with a temperature of more than 500-degree F, then you can use quartz or sapphire glass. The glass of double window sight glass can be available with a metal ring which will make it resistant to bending stress, and it can crack if you don’t have a metal ring and your double window sight glass. You can use them in high pressures or temperatures, so they need resistance against high forces, and you need safety margins in this regard. You can Fused double window sight glass in pharmaceutical industries. And if you are working with an acidic material, you should use borosilicate glass. In your application, if you have soda-lime glass in your system, then you should not reuse it after maintenances of the double window sight glass.

What is the view through double window sight glass for flow applications?

This type of double window sight glass contains two windows on opposite sides. It will allow you to see the process which is going on inside the system. If you don’t have enough light to view the process correctly, you can get a light on the opposite side, allowing you to see the flowing material. This kind of double window sight glass can handle the ASME pressure rating.

What is the implementation of double window sight glass?

A double window sight glass is essential for many industries and applications. These are particular kinds of valves that you can use in your applications; here are some of the typical applications of double window sight glass:

• You can use double window sight glass if you are working with pharmaceuticals.
• It would be best to have a double window sight glass handling a chemical plant.
• It is essential for the petrochemical industry.
• Double window sight glass is trendy in the food and dairy industries.
• It is a necessary part of the marine industry.
• You can use it in the water treatment plant.
• Double window sight glassis an integral part of oil and gas units.
• You can use double window sight glassin metallic industries.
• You can use double window sight glass when you have a fertilizer unit.
• You can use double window sight glass inside the dye and pigment industries.
• You can use double window sight glass inside the meals and dairy industries.
• You can use Double window sight glass in petroleum and refinerie

What factors to consider when selecting a double window sight glass for your industry?

When you have decided to get a double window sight glass for your industry, then you should consider the appropriate material for your double window sight glass. So let’s look at these factors, which are essential for your system. The thickness of glass: A double sight glass should always be compatible with your system, so it’s imperative to check and observe the actual conditions and keep an eye on the situation to notice if you think double window sight glass is under effect to any special needs. As many internal and external elements can be dangerous to the system conditions. And some factors can even damage the glass of double window sight glass. So you must pick out a thick glass on your double window glass.  If you don’t take this seriously, increased pressure and temperature can harm your system and even be dangerous for you and your surroundings.

The temperature inside the system:

If you want to get a double window sight glass in, then you should keep in mind the temperature extremes in your double window sight glass. If the temperature fluctuates, the double-window sight glass will perform differently, At the highest and lowest temperatures. I.e., if the temperature is less than 300-degree F, you should use soda-lime glass. And if the temperature is more than 500-degree F, you should use quartz or sapphire glass.

The pressure inside the system:

The pressure can fluctuate when your system works, but it’s imperative to remember that pressure is divided into many kinds. Working pressure is the maximum pressure that the system has to hold. And user will specify test pressure so that you should ensure that the flow elements will not outstrip the safety needs. If the pressure exceeds the required, the pipeline system may burst. So it would be best if you took care of the pressure level. You can decide on different pressure capacities with the help of material, thickness, and diameter, which is not supported. And it would be best to consider the average and highest upset pressure when you create double window sight glass thickness.

Thermal shock:

When you get a double window sight glass for your system, remember that the glass you use should have the proper thermal expansion, low conductivity, and durability. It will not work correctly in your system and can create problems like such conditions can cause temperature fluctuations.

Corrosion:

If you are working with corrosive material, you can face some problems in your system as corrosive cloth could make your double window sight glass cloudy, growing trouble for your work. So in such a system, you should use glass that can resist high corrosion.

Abrasion:

Abrasive particles can erode the double window sight glass. And it will create a situation because of which you will not be able to view the process going on inside the system. So you should always consider the thick and long-lasting material of your double window sight glass. Always maintain your double window site glass. Impact on double window sight glass: In Some industries, the material flowing through the system can create an impact against double window sight glass. i.e., food industries. It would be best to use fused glass to lessen the chance of double window sight glass failure.

Who is producing double window sight?

BCST is a double window sight glass manufacturing company that has gained an excellent reputation and high position due to its high quality and superior products in a short span of 20 years. The company supplies not only double window sight glass to China but also high-quality double window sight glass to foreign countries, which has proved it is unique and the best quality in more than 100 countries of the world. A sight glass is a tool to view method vessels or tanks from the inside, and it is also called a sight window. On the other hand, a double window sight glass is composed of a kind of toughened sight glass that is settled in a position opposite each other. You can use a double window sight glass to check different stages of the process, and a sight glass is a particular instrument used in many processing industries. You can use a double window sight glass in many applications, and you can use them in pharmaceutical industries, oil, and gas, water treatment, etc. you can get high-quality double window sight glass from BCST.

What is the working principle of double window sight glass?

Double window sight glass is joined to the pipeline in a horizontal or vertical role with the assistance of flanges. When the flow moves inside the pipeline, you can examine the system’s colour, turbidity, and many other important things because of the double glass window sight glass.