Why Our Borosilicate Sight Glass Leads Pure Steam Boiler Factories Forward
In high‑pressure steam generation, visual monitoring must be reliable, safe, and never compromise purity. Our borosilicate sight glass for pure steam boiler factory delivers crystal‑clear observation while withstanding temperatures up to 300 °C and pressures exceeding 2 MPa. Engineered from low‑expansion borosilicate glass and reinforced with stainless‑steel or Inconel frames, the unit offers unmatched thermal shock resistance and chemical inertness—critical for power‑plant, petrochemical and food‑process boiler lines.
Competitive Advantages
- ✔ Zero‑contamination design – all metal‑glass interfaces are sealed with high‑temperature PTFE gaskets, eliminating leaching into steam.
- ✔ Extended service life – borosilicate’s coefficient of thermal expansion (3.3 × 10⁻⁶ /K) matches the frame, preventing stress‑fracture after thousands of thermal cycles.
- ✔ Compliance ready – conforms to ASME Section VIII, PED, and ISO 9001 manufacturing standards; documentation available for plant audits.
- ✔ Customizable dimensions – flange sizes from DN 25 to DN 500, multiple viewing angles (0°, 45°, 90°) and optional remote‑read optics.
- ✔ Rapid turnaround – typical lead time 15‑45 days, with in‑house glass tempering and CNC frame machining.
Product Overview
The sight glass is a standalone monitoring component that slots directly into the boiler’s steam header or drum. Its clear borosilicate pane provides uninterrupted visual access to water level, bubble formation, and potential fouling without requiring shutdown. The robust metal housing resists corrosion from high‑purity condensate and aggressive cleaning agents, while the double‑seal arrangement guarantees leak‑free operation under continuous duty.
Typical Specifications (customizable per order)
| Parameter | Standard Range | Notes |
|---|---|---|
| Glass Type | Borosilicate (e.g., 0.5 mm – 5 mm thickness) | Low thermal expansion, high clarity |
| Maximum Working Pressure | 0.5 MPa – 2.5 MPa | Depends on frame material and glass thickness |
| Maximum Operating Temperature | 150 °C – 300 °C | Verified by thermal‑shock testing |
| Frame Material | AISI 304/316 SS, Inconel 625 | Select based on corrosion environment |
| Connection Size | DN 25 – DN 500 (B16.5/ANSI) | Flanged or threaded options available |
| Seal Type | PTFE, Graphite, Metal‑Caged | Chosen per temperature/pressure regime |
FAQ
What is the minimum order quantity (MOQ) for a custom‑size sight glass?
Our production line is flexible; the MOQ is 1 unit for standard sizes and 5 units for fully custom dimensions or exotic frame alloys. Engineering drawings and material selection can be confirmed during the quotation stage.
Can the glass be inspected for defects before shipment?
Yes. Each pane undergoes 100 % visual inspection and a high‑energy ultrasonic test. A certification of conformity, including glass thickness and pressure rating, is included with every delivery.
What warranty do you provide?
We offer a 24‑month limited warranty covering manufacturing defects and glass breakage under rated operating conditions. Installation errors or misuse are excluded, but technical support is available throughout the warranty period.
Is the borosilicate sight glass for pure steam boiler factory compatible with existing ASME‑rated headers?
Absolutely. Our flange designs follow ASME B16.5 standards, and we provide CNC‑machined bolt‑hole patterns to match existing connections. If a non‑standard interface is required, our engineering team can produce a tailored adapter at no extra tooling cost for orders over 10 units.
Ready to secure a reliable visual monitoring solution for your steam system?
Contact Our Engineering Team Today