Sight Glass Window Flange-To-Tank Connection
Flanged sight glasses for tanks allow for a total view of the inside of a process. Depending on the fluid temperature and pressure to work with, a recommendation can be made on the best material of manufacture, types of crystals and types of gaskets.
OUR WARRANTY
100% Satisfaction Guarantee
Douglass warrants merchandise against defective workmanship and materials that become apparent within a period of 12 months from the date of receipt of invoice by the purchaser (hereinafter referred to as the warranty period). All liabilities under the warranty provisions shall expire when the warranty period has expired. Please feel free to contact us if you have any questions or comments.
SHIPPING AND PACKAGING
At Douglass, we use a unique and patented packaging method that minimizes the risk of glass damage during shipping. This system ensures your products arrive in perfect condition, just as we would like to receive them ourselves.
We understand that not all glass is the same, so we tailor our packaging techniques based on the type and quantity of products you order. This ensures maximum protection for every shipment.
Douglass flanged sight windows consist of three parts: the flange on the tank, the bottom flange, and the cover flange. The bottom flange, which is not welded, is designed with the same dimensions as a standard flange but adapted to accommodate bolts and glass. The cover flange maximizes the viewing area. Installation is simple, as the bottom flange is bolted directly to the tank’s flange, creating a “sandwich” assembly, hence the name "sandwich sight glasses."
Flange-To-Tank Connection - Key Features
Non-Welded Assembly for Easy Installation
This sight glass window eliminates the need for welding, making installation straightforward. The bottom flange bolts directly to the tank’s existing flange, creating a secure “sandwich” assembly. This feature greatly simplifies maintenance and replacement, as it avoids the complexities and safety concerns associated with welding on-site, reducing installation time and labor costs.
Customization Flexibility in Size and Material
The sight glass can be manufactured to fit any flange size and is adaptable to a wide range of materials, including stainless steel, carbon steel, or special alloys that match the existing tank flange. This adaptability ensures that the sight glass can be tailored to specific operational needs, including corrosive environments or sanitary applications, making it a versatile solution for various industries.
Virtually Unlimited Pressure Resistance
The pressure resistance of the sight glass assembly is largely dictated by the selected flange and glass specifications. By choosing a higher pressure-rated flange and increasing the glass thickness, the assembly can be configured to withstand extremely high pressures. This modular approach allows the sight glass to be used in demanding applications where pressure limitations would typically pose a constraint, ensuring safety and durability in harsh operating conditions.
Parts and Materials
| Item | Part name | Material options |
|---|---|---|
| 1 | Allen Bolts |
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| 2 | Flanges |
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| 3 | Gasket |
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| 4 | Sight Glass |
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TECHNICAL INFORMATION
| ID | 3" | 7.5" | 2" | 4" | 9" | 2" | 5" |
|---|---|---|---|---|---|---|---|
| A (Visible Diameter) | 3" (76.20 mm) | 7.5" (190.50 mm) | 2" (50.80 mm) | 4" (101.6 mm) | 9" (230.00 mm) | 2" (50.80 mm) | 5" (127.00 mm) |
| B (Total Diameter) | 10" (255.00 mm) | 2.5" (63.50 mm) | 6" (152.40 mm) | 11" (280.00 mm) | 3" (76.20 mm) | 8" (203.20 mm) | 13.5" (345.00 mm) |
| C (Minimum Thickness) | 3.5" (88.90 mm) | 10" (254.00 mm) | 16" (405.00 mm) | 3.5" (88.90 mm) | 12" (304.80 mm) | 19" (485.00 mm) | 3.5" (88.90 mm) |