Instrumentation Tube Fittings
Double Ferrule Bulkhead Union
Double ferrule bulkhead union for connecting tubing through panels or equipment walls. Available in fractional and metric tube sizes for instrumentation and industrial fluid systems.
Specifications
- Series
- BU series
- Connection
- Double Ferrule Tube × Tube
- Tube Sizes
- Fractional & Metric
- Configuration
- Straight Bulkhead Union
- Standard Material
- 316 Stainless Steel
- Special Materials
- Monel 400, Inconel 625, Super Duplex 2507 & Other Special Alloys
Overview
The BU Series Double Ferrule Bulkhead Union provides a straight tube-to-tube connection through a panel, enclosure or equipment wall. Double ferrule tube connections on both ends provide mechanical gripping and sealing, while the bulkhead body and mounting hardware secure the fitting through the mounting surface.
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 bulkhead tube-to-tube configuration
- Designed for through-panel and equipment-wall installation
- Fractional and metric tube-size options
- Bulkhead mounting hardware for panel installation
- 316 stainless steel as the standard material
- Special-alloy options for project requirements
Engineering Specifications
Item | Specification |
|---|---|
Product Type | Double Ferrule Bulkhead Union |
Series | BU Series |
Connection | Double Ferrule Tube × Double Ferrule Tube |
Configuration | Straight Bulkhead Union |
Tube Sizes | Fractional and Metric |
Mounting | Through-Panel / Bulkhead |
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 & Mounting Options
BU Series Bulkhead Unions are available for fractional and metric tubing. Each standard BU configuration connects equal-size tubing across a panel or equipment wall in a straight-line arrangement.
Panel hole size and maximum panel thickness vary by tube O.D. and configuration. Select the required tube O.D. and confirm the installation requirements when specifying the fitting.
Size & Configuration Information
Dimensions, ordering numbers, panel hole size and maximum panel thickness vary by tube O.D. Configuration-specific dimensional and mounting 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 Bulkhead Union 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 Bulkhead Unions are commonly used for:
- Control cabinets and enclosures
- Process-control tubing
- Sampling and test systems
- Equipment-wall tube penetrations
- Hydraulic and industrial fluid systems
Selection & Ordering Information
To specify the required Bulkhead Union, provide:
- Tube O.D. — fractional or metric
- Panel hole / installation requirements, where applicable
- Material
- Operating pressure and temperature
- Quantity
Existing part numbers, drawings, specifications or product references can also be used for product matching and quotation review.
