Redline Tubular Gauge Glass | Borosilicate Red Line Gauge Tube
Product Overview
Redline tubular gauge glass is a standard choice for industrial buyers who need a clear level gauge tube with stronger visual contrast than a plain transparent tube. The Red Line variant as a product that offers convenient viewing from a distance because the red stripe creates an optical effect that makes the liquid level easier to determine.
Typical Applications
Redline tubular gauge glass is commonly used where operators need direct liquid-level visibility in service environments such as tanks, reservoirs, boilers, and flowmeters. The tubular gage glass family is used to observe chemical processes inside tanks, pipes, and reactors.
Product Alias: redline tubular gauge glass for steam boiler, red line gauge glass for liquid tank, and redline sight glass tube for reservoir level monitoring.
Material and Performance
Material Properties
| Property | Value | Source |
|---|---|---|
| Material family | Borosilicate glass | |
| Thermal expansion coefficient | 3.3 × 10⁻⁶ at 20°C | |
| Chemical resistance | High chemical durability / improved corrosion resistance | |
| Thermal shock resistance | High thermal shock resistance | |
| Optical function | Red stripe improves visibility of colorless liquid | |
| Typical material designation | 8330 |
Why Buyers Choose This Product
The main advantages are simple: the red line improves readability, the borosilicate body offers corrosion and thermal shock resistance, and the product is available in a wide range of sizes and finishes for industrial use. Red Line variant is popular for tanks and reservoirs and low-pressure boilers, and that a fire-polished finish improves safety and consistency.
End finishes may be cut, ground, or fire polished, and the working pressure depends on the final design combination of end finish, diameter, and length.
Technical Specifications
Product Reference Data
| Parameter | Value | Source |
|---|---|---|
| Product type | Redline tubular gauge glass | |
| Common aliases | Red line gauge glass / redline gage glass / redline gauge glass tube | |
| Material | Borosilicate glass | |
| Material number / family | 8330 | |
| OD range | 1/2″ OD to 1 1/2″ OD | |
| Red Line variant length range | 8–24 inches | |
| End finishes | Cut / ground / fire polished | |
| Pressure ratings | 90–600 psi depending on end finish, diameter, and length | |
| Main application range | Tanks, reservoirs, boilers, flowmeters | |
| Visibility feature | Red stripe between two white lines |
Common Size / Pressure Reference
| OD | Typical Lengths | Pressure Reference | Notes |
|---|---|---|---|
| 1/2″ OD | 8–72 in in one published supplier table | 90–390 psi depending on length and finish | Redline gauges are widely used in tanks, reservoirs, and low-pressure boiler service. |
| 5/8″ OD | 8–72 in in one published supplier table | 90–370 psi depending on length and finish | Available in redline form with improved level visibility. |
| 3/4″ OD | 8–36 in in one published supplier table | 200–360 psi depending on length and finish | Suitable for larger-diameter tubular gauge applications. |
Quality Proof and Evidence
A published product-variant page states that the red stripe produces an optical effect that makes the liquid level easy to determine from a distance. A supplier product page also shows comparison images of ordinary tubular gauge glass versus redline tubular gauge glass to demonstrate the visibility advantage.
For your own website, this is the best place to add your real documents:
- inspection report
- dimensional check record
- pressure or thermal test data
- customer case photo
- certificate or conformity document
Do not publish a certificate number, test result, or customer name unless it is real and verifiable.
FAQ
What is redline tubular gauge glass?
It is a borosilicate tubular gauge glass with a red stripe between two white lines, designed to make liquid levels easier to read.
Where is it usually used?
It is commonly used in tanks, reservoirs, low-pressure boilers, and other industrial level-indication systems.
What material is usually used?
The standard material is borosilicate glass.
What sizes are available?
Published product literature shows diameters from 1/2″ OD to 1 1/2″ OD, and the Red Line variant can be produced in lengths from 8 to 24 inches.
What pressure range can it handle?
90 psi to 600 psi, depending on end finish, diameter, and length required.
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