Instrumentation Tube Fittings
Double Ferrule Union Fitting
Double ferrule union fitting for connecting two tubes of the same size in a straight run. Available in fractional and metric tube sizes for instrumentation and industrial fluid systems.
Specifications
- Series
- TU Series
- Connection
- Double Ferrule Tube × Tube
- Tube Sizes
- Fractional & Metric
- Configuration
- Straight Equal Union
- Standard Material
- 316 Stainless Steel
- Special Materials
- Monel 400, Inconel 625, Super Duplex 2507 & Other Special Alloys
Overview
The TU Series Double Ferrule Union Fitting provides a straight connection between two tubes of the same outside diameter. Double ferrule connections at both ends provide mechanical gripping and sealing without requiring a threaded intermediate connection.
Fractional and metric tube sizes are available for instrumentation, process control, sampling, testing and other industrial fluid systems.
Key Features
- Double ferrule tube connections at both ends
- Straight equal-tube union configuration
- Fractional and metric tube-size options
- No pipe-thread connection required between the two tube ends
- 316 stainless steel as the standard material
- Special-alloy options for project requirements
- Multiple size options for instrumentation and industrial fluid systems
Engineering Specifications
Item | Specification |
|---|---|
Product Type | Double Ferrule Union Fitting |
Series | TU Series |
Connection | Double Ferrule Tube × Double Ferrule Tube |
Configuration | Straight Equal Union |
Tube Sizes | Fractional and Metric |
Standard Material | 316 Stainless Steel |
Special Materials | Monel 400, Inconel 625, Super Duplex 2507 and other special alloys |
Pressure Rating | Based on tubing, material and operating temperature |
Dimensions | Configuration-specific |
Tube Size Options
TU Series Union Fittings are available for fractional and metric tubing. Each standard TU configuration connects two tubes of the same outside diameter in a straight line.
Select the required tube O.D. in fractional or metric sizing.
Size & Configuration Information
Dimensions and ordering numbers vary by tube O.D. Configuration-specific dimensional information can be provided for quotation and technical review.
Materials
316 stainless steel is the standard material for this series.
For corrosive or special-service requirements, Monel 400, Inconel 625, Super Duplex 2507 and other special alloys are available for applicable project configurations.
Specify the required material grade together with the tube size and quantity when requesting a quotation.
Pressure & Temperature Considerations
Allowable working pressure depends on the complete tube-fitting system rather than the Union Fitting body alone. Relevant factors include tubing material, tube O.D., wall thickness and operating temperature.
The pressure capability of the lowest-rated component in the assembled system should be considered when determining allowable working pressure.
For pressure- or temperature-sensitive applications, provide the tubing specification, material, operating pressure and operating temperature for review.
Typical Applications
Double Ferrule Union Fittings are commonly used for:
- Process-control lines
- Sampling and test systems
- Measurement and monitoring systems
- Hydraulic and industrial fluid systems
- Straight tube-to-tube connections in equipment and piping assemblies
Selection & Ordering Information
To specify the required Union Fitting, provide:
- Tube O.D. — fractional or metric
- Material
- Operating pressure and temperature
- Quantity
Existing part numbers, drawings, specifications or product references can also be used for product matching and quotation review.
