Four Key Factors to Consider When Selecting Instrumentation Tube Fittings

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While developing a leak-free instrumentation system, one of the first measures to ensuring safety and efficiency is to choose the correct tube for the required use. Without this vital component and its compatibility with the rest of the components, no system integrity is complete. In this article, we will discuss four main criteria to remember when choosing a standard instrument tube for use with tube fittings.

Duplex Steel Instrumentation Fittings have been developed to work in a broad range of uses that require the ultimate in product consistency. Their compatibility with the chosen tubing is crucial  for providing consistently high-level of reliability.

Tubing Material

In order to choose the right material of tube fittings, consider the operating conditions such as temperature, pressure and media. The expected life of such tubing’s, cost and suitability for the environment must also be kept in mind.

For most industries, you should choose a corrosion resistant material. Primarily, copper, carbon steel and stainless steel tubing’s are used. The latter is one of the choice materials as the tubing’s will be highly corrosion resistant.

Tubing hardness

The tubing itself should be softer than the fitting materials. Specific tubing hardness, however, must be achieved for leak-free connections.

When it comes to stainless steel tubing’s, a variety of tubing hardness specifications work well under different conditions. All our tubing’s are tested for high performance and offer maximum advantage in terms of installation costs.

Installers should perform a 1-1/4 turn to ensure proper joints. This is especially true for harder tubing’s which have higher torque. For example, Stainless Steel tubing should be specified as Rb 80 or less hardness value.

Tubing wall thickness

A wide range of wall thicknesses are available for these tubing’s. Suitability for a particular application is determined by their pressure ratings.

Usually, thickness varies from 0.028 inches to 0.109 inches. These wall thicknesses are preferred for tubes of up to 1 inch in size. Higher tube sizes may have increased wall thickness, ranging between 0.125 and 0.167 inches.

Tubing surface coating

A number of different surface coatings are available, depending on the requirements of application.

For instance, metal tubings are often coated with corrosion resistant coatings, particularly in an environment which is conducive to such reactions. Still, opting for Duplex Steel UNS S32205 Instrumentation Fittings is the best option.


The appropriate design, selection and installation of any instrumentation fitting is vital to the energy conservation, performance and maintenance of any fluid and gas production operation. Reducing leakage, reducing friction and ensuring corrosion resistance makes the device safer, more durable and longer service life. It is important that automated processes be optimized to be extremely efficient, and this can only be achieved through appropriate design and safety considerations.

When design pressures are met, less cycles are needed to reach production deadlines, increasing productivity and reduce operating costs. The consistency of the product and the precision of the initial installation of all parts often minimize potential repair problems and cost overruns.

Four Key Factors to Consider When Selecting Instrumentation Tube Fittings

by admin time to read: 2 min