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Sight Glass Tube Component – Machinery and Equipment Manufacturing

Component Specifications

Definition

A sight glass tube is a transparent cylindrical component installed on industrial vessels, tanks, or pipelines to provide direct visual observation of liquid levels, fluid color, clarity, and flow conditions. It serves as a simple, reliable monitoring device without requiring electrical power or complex instrumentation.

Working Principle

Operates on the principle of communicating vessels - the liquid level inside the tube matches the level in the connected vessel due to hydrostatic pressure equilibrium. The transparent material allows light transmission for visual inspection.

Materials

Borosilicate glass (temperature resistant), tempered glass, acrylic/polycarbonate (for lower pressure/temperature applications), with stainless steel (304/316) or brass end fittings.

Technical Parameters

Length 100-2000 mm
Diameter 10-100 mm
Connection Type Flanged, threaded, or clamped ends
Pressure Rating Up to 10 bar
Temperature Range -20°C to 200°C

Standards

ISO 3585, DIN 7080, DIN 7081

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Sight Glass Tube.

Parent Products

This component is used in the following industrial products

Level Indicators

Devices that visually or electronically display the liquid level inside a steam drum.

View Product Details

Engineering Analysis

Risks & Mitigation

Glass breakage from thermal shock
Chemical corrosion
Mechanical impact damage
Fogging/condensation obstructing view

FMEA Triads

Trigger: Thermal stress from rapid temperature changes
Failure: Cracking or shattering of glass tube
Mitigation: Use borosilicate glass, install thermal shields, implement gradual temperature changes

Trigger: Chemical incompatibility
Failure: Corrosion or etching of glass surface
Mitigation: Select appropriate glass grade, use protective coatings, regular inspection

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

±1 mm for diameter, ±2 mm for length

Test Method

Hydrostatic pressure testing, visual inspection for defects, dimensional verification

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation

4/5

Manufacturing capability

4/5

Inspection readiness

5/5

Supplier transparency

3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What are the main applications of sight glass tubes?

Used in chemical processing, pharmaceutical manufacturing, food and beverage production, water treatment, and HVAC systems for monitoring liquid levels in tanks, reactors, and pipelines.

How do you maintain a sight glass tube?

Regular cleaning to prevent fouling, inspection for cracks or scratches, checking gaskets and seals for leaks, and ensuring proper alignment during installation.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Sight Glass Tube