Welcome to the premier engineering authority for high-pressure fluid observation, real-time bidirectional stream evaluation, and critical process clarity tracking. Operating state-of-the-art metal casting lines, precision optical-honing yards, and certified pressure-integrity inspection blocks, FlowBiz Export Pvt Ltd manufactures, supplies, and exports industry-grade Double Window Sight Glasses.
Double Window Sight Glass is a product that FlowBiz Export Pvt Ltd manufactured to provide precise visual observation of fluid flow within a pipeline or tank. Featuring two transparent windows positioned opposite each other within a robust metal or stainless steel frame, these indicators are finished in an industrial Silver Finish to provide advanced external corrosion resistance and enhanced longevity in rugged industrial environments.
Every double window indicator block undergoes 100% rigorous hydro-pneumatic shell validation and optical thermal-shock safety audits to comply with global engineering standards before dispatch.
| Engineering Parameter | Certified Product Specifications & Compliance Codes |
| Design Standards | Engineered in full compliance with ASME B16.34 and EN 12516 standards |
| Flange Configuration | Conforms strictly to ASME B16.5 Class 150 / Class 300 face drillings |
| Size Portfolio Range | Tailored to fit standard pipeline sizes up to 24 inches (600mm) |
| Pressure Class Control | Precision-engineered for ASME Class 150, Class 300, and Class 600 lines |
| Body Construction MOC | High-Grade Mild Steel (MS), Carbon Steel, or Stainless Steel |
| Window Indicator Glass | Dual Opposing Toughened Borosilicate Glass or Durable Acrylic |
| Sealing System Matrix | Leakfree high-density PTFE, EPDM, Viton, or Graphite gaskets |
| External Visual Finish | Premium, high-visibility industrial Silver Protective Coating |
The engineering advantage of a double window sight glass centers on its dual-axis viewing ports, which eliminate the lighting limitations common to single-window indicators:
Comprehensive Dual-Window View: FlowBiz Export Pvt Ltd Double Window Sight Glass features two transparent windows typically made of tempered glass or durable acrylic positioned opposite each other within a robust metal or stainless steel frame. These windows allow operators to observe the contents of the pipeline or tank from both sides, offering a comprehensive view of the flow process.
Backlit Illumination Path: By positioning two viewports directly opposite each other, ambient plant light passes straight through the fluid stream. Operators can also place an industrial light source behind the rear window to illuminate opaque or dark liquids, making it easy to spot fine suspended impurities, entrained gas bubbles, or phase separations.
Leakfree Design Integrity: The sight glass assembly utilizes high-tensile compression bolting to clamp the dual glass discs firmly against precision-machined seats. Paired with chemical-resistant gaskets, this architecture maintains a leakfree barrier under intense system vibration, thermal cycling, and high operational pressures.
[ COMPressed REAR COVER FLANGE ] /==================/\==================\ \/ \/ +------------------------------------------------------------+ | Flange Face ==> [ Toughened Borosilicate Lens ] ==> Flange Face | ===> | (MS Silver) [ Backlit Process Flow Cavity ] (MS Silver) | ===> Raw Fluid Input [ Toughened Borosilicate Lens ] Clean Output Flow +------------------------------------------------------------+ /\ /\ \==================\/==================/ [ COMPRESSED FRONT COVER FLANGE ] Clear Observation & High-Quality Construction: Our double window sight glass guarantees a clear, uninterrupted view into pipelines, making it ideal for process observation in industrial plants. The heavy-duty MS construction provides strong resistance to corrosion and mechanical abrasion.
Pressure and Temperature Resistance: Built with robust, pressure-rated metal castings and thermal-shock resistant borosilicate glass, these units withstand abrupt system temperature shifts and high pressure surges without micro-cracking.
Safety Enhancement: It provides continuous visual confirmation of product flow and clarity without exposing plant operators to high-velocity, toxic, or hazardous processing fluids.
Compliance with Standards: Fabricated in strict compliance with international dimensions and pressure codes, these units seamlessly integrate into standard processing pipelines, ensuring consistent field performance.
This type of sight glass is commonly used in industrial applications, particularly in processes where monitoring and inspection of liquid or gas flow are crucial across multiple domains:
Chemical Processing & Petrochemicals: Real-time visibility of raw chemical reagents, organic solvents, bulk acids, and hydrocarbon streams.
Oil & Gas Infrastructure: Monitoring lubrication oil lines on high-speed compressors, pump suction pipelines, and condensate discharge grids.
Pharmaceutical & Clean Facilities: Tracking active pharmaceutical ingredient (API) synthesis loops, non-corrosive chemical transfers, and solvent distribution lines.
Water Treatment & Power Plants: Visual monitoring of filtration clarity, municipal wastewater treatment lines, and boiler blowdown circuits.
A: A double window sight glass is installed directly into pipelines or process routing lines to provide real-time visual inspection of the flow and clarity of liquids or gases. It allows operators to check flow rates and easily detect impurities, blockages, phase separations, or inconsistencies during industrial processes.
A: Our double window sight glass is crafted from high-quality Mild Steel (MS) or premium stainless steel alloys, giving it a solid, pressure-retaining structure. The viewing ports are fitted with toughened borosilicate glass, and the outer frame is finished in an attractive silver color for added durability and resistance to environmental factors.
A: Installation is ideal during the initial setup of industrial pipelines or when upgrading existing lines that require improved monitoring. It is particularly beneficial when visual confirmation of product flow, color changes, or fluid consistency is essential for positive process control and equipment protection.
A: We manufacture, quality test, and supply all of our pipeline indicators from our centralized engineering facility in Mumbai, India. Leveraging our experience as a prominent supplier and exporter, we efficiently serve both domestic and international markets, ensuring fast and reliable delivery.
A: Sourcing from our company is simple. Reach out to our technical sales team via our website or contact customer support with your specific requirements regarding line size, pressure rating, operating temperature, and chemical media. Our team will guide you through the selection, provide competitive quotations, and arrange prompt dispatch after order confirmation.
A: Our sight glass offers superior bidirectional visibility for clear process monitoring, robust mild steel construction for extended service life, and straightforward integration into standard-sized piping systems. This comprehensive visibility leads to improved quality control, faster troubleshooting of line blockages, and higher overall operational efficiency.
Are you updating a high-pressure utility circuit that requires an ASME Class 300 flanged double window sight glass, or upgrading a chemical process line with a heavy-duty, silver-finished dual-view indicator block? Contact our sales and engineering division in Mumbai today to secure a factory-direct quote on our Forged Steel and Mild Steel Double Window Sight Glasses, or ask a single relevant question regarding your specific process fluid properties or internal flow indicators below to guide the conversation forward.

Price:
Price 6000 INR / Unit
Minimum Order Quantity : 1 Number
Application : Visual monitoring of liquid flow in pipelines
Type : Full View Sight Glass
Disc : No disc (tube style design)
Temperature : 10C to +200C
Price 500 INR / Unit
Minimum Order Quantity : 1 Number
Application : Industrial, Chemical Processing, Pharmaceutical, Food & Beverage, Water treatment plants
Type : Single Window Sight Glass
Disc : Toughened Borosilicate Glass
Temperature : Up to 180C
Price 2400 INR / Unit
Minimum Order Quantity : 1 Number
Application : Process Industries likeChemical, Power, Refinery, Petrochemicals, Nuclear, Water
Type : Manual
Disc : SS 304
Temperature : Up to 200C Celsius (oC)