Union Tube Fittings
Introduction
Union Tube is widely using as a connecting fitting for tubing, in many cases straight tubing instrumentation uses a maximum length of 6 meters or 20 feet.
Besides that, straight tubing is also available in the form of coil tubing with varying lengths as desire.
Coil Tubing
Straight Tubing
Tube union is use to connect seamless tubing and not use for pipes or other connections.
We need to provide a union tube if need to install an instrument or hydraulic system.
Union Tube
Type of Union Tube
Union Tube has various shapes and size variations, and the following is information on these shapes as follows:
Union Tube
It has been explain previously that this union tube is use to connect tubing with the same type and size. In the left and right sides the size is completely the same and the shape is also completely the same.
Conversion Union Tube
Conversion union because is use to connect two types of connections. The connections use are different types of measurement units, such as Fractional to Metric.
Bulkhead Union Tube
The bullhead union is use for panels, on one side of the union tube there is a nut which functions as reinforcement and as a fastener for the clamps in the panel holes. Below we provide a picture of using the bullhead panel.
Bulkhead Reducing Union
This Bulkhead Reducing Union tube is used to connect tubing of different sizes, namely large sizes to smaller sizes and is used on panels.
Bulkhead Conversion Union
Conversion union is used to connect two types of connections. The connections use are different types of measurement units, such as Fractional to Metric or vice versa and are use in panels.
Bulkhead Lock Nut
Bulkhead Lock Nut is a nut that is used as a lock on the panel.
Other Type Bulkhead Union
The following are several forms of bulkhead union images.
Intermix Fittings of Different Specifications of size
Mixing components of different specifications in union tube can also compromise the sealing performance of tube fitting. Due to size differences, the sealing performance can be significantly reduced after installation. Some metric and fractional sizes are quite similar, such as the 6mm and 1/4” ferrules, making them difficult to distinguish when mixed together. Therefore, fittings of different specifications should be stored separately. Additionally, during installation, it is essential to carefully check that the specifications are correct to avoid the issues mentioned above.
FITOK has designed steps on the body and nuts of metric straight tube fittings to visually distinguish them from fractional specifications. The forged components such as elbows, tees, and crosses do not have a step on the body but are marked with metric sizes on the ports.
Installation
The Union Tube Installation Method is the same as other tube fittings as explained in the following link.
Under-Tightening or Over-Tightening in Fitting Installation
Under-tightening installation of tube fittings can prevent proper sealing between the ferrule and the tube, potentially causing medium leaks during system operation. When initially installing the tube fitting, a gap gauge can be used to determine whether the fitting is tightened sufficiently, helping to avoid leaks caused by loose installation.
Over-tightening the nut can cause severe deformation of the ferrule and tube, increasing the risk of leaks. Deformed or damaged tube fittings and tubes will require repairs or replacements, resulting in additional costs. Moreover, excessive tightening can reduce the number of times a fitting can be reinstalled.
We offers a variety of Tube Fittings and Tube installation Tools specifically designed.
