Back Ferrule

Back Ferrule

What is a Back Ferrule?

Two-ferrule fittings get preferred by industries for a reliable, leak-free seal. A back ferrule is usually metallic and used to fasten or reinforce the fitting. It plays a salient role in preventing leakage. The front edge of the ferrule is stronger than the pipe to guarantee a tight grip. It pushes axially onto the front ferrule to create an effective seal during installation.

Multiple industries and applications, like petrochemicals and power, employ these ferrules. You can find back ferrule tube fittings in sensing lines and hook-up systems for instrumentation. These get built with different materials based on the application, like a Hastelloy C276 back ferrule.

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Stainless steel back ferrule compression fittings suppliers in UAE

Function of stainless steel back ferrule

Twin-ferrule fittings are manufactured in various materials to suit industrial requirements. Harsh environments demand a stainless steel back ferrule to tolerate high pressure or temperature. It can withstand corrosion and severe conditions without producing a leak. It also has a reasonable tolerance for vibration.

The material you choose for your ferrule will depend on the specific requirement and the budget. Wide application and time-tested reliability make stainless steel fittings a preferred choice for analytical installations, chemical processing, and the transportation sector. A Stainless Steel 304 back Ferrule is a durable choice that resists scaling and damage for long service life.

Pursue a relationship with domestic manufacturers & suppliers in Middle East countries for back ferrule tube fittings

Alloy 600 vs. Alloy 825 back ferrule

Inconel alloys are a popular choice for ferrules. An Inconel 600 back ferrule 600 comprises nickel (72%), chromium (14%), iron (6%), and some trace compounds. It is excellent for resisting high temperatures, corrosion, and stress. The high chromium content increases the oxidation resistance and makes it perfect for hearths, chemical industries, furnaces, etc.

On the other hand, Incoloy Alloy 825 back ferrule comprises nickel, iron, and chromium but also includes molybdenum, copper, and titanium. It can handle high temperatures and resist rupture. The unique composition helps this alloy handle oxidation, carburization, etc., as needed in chemical and petrochemical industries.

Hastelloy, Incoloy and brass back ferrule are directly interchangeable with Swagelok, Ermeto, HY-LOK, Legris, Parker

Application of 2507 Super Duplex back ferrule

Leak-proof twin-ferrule systems get used in several critical industries. A 2507 Super Duplex back ferrule contains chromium (25%), nickel (7%), and molybdenum (4%). Chemical processing plants and seawater equipment rely on this material for its superior corrosion resistance. The properties of this material include resistance to pitting, high thermal conductivity, and low thermal expansion.

These ferrules operate excellently in chloride-based environments. The power sector and oil and gas plants for offshore control panels use them too. The production of these ferrules must ensure that metallurgical specifications get met and that defects do not arise.

Inconel 600 and 6-moly Back Ferrule for fluid transportation in Oil and Gas

Features & Advantages

The prime advantage of a twin-ferrule design is its ability to generate a leak-proof seal amid high pressure and cyclical temperature changes. A back ring works with different materials, such as a Monel 400 back ferrule and tube sizes. These ferrules get specially manufactured to resist stress, vibration, and fatigue.

One more benefit of back ferrule compression fittings is their fitment for low torque operations. You can use them for a long time while avoiding galling on the threads. They are not difficult to install or operate and fit right into different installations like process and instrumentation lines without glitches. They can even work smoothly in a vacuum.

2507 Super Duplex back ferrule in NPT (ANSI B1.20.1), BSPT, NPTF, BSPP, Metric Straight Thread

Can you reuse compression back ferrule?

Whether you can reuse these fittings depends on the situation. If you are conducting system repair or maintenance, you can probably reuse a fitting, like a 6-moly Back Ferrule. In this case, you reassemble without significant changes and check that the ferrule has not been damaged or eroded. However, if the system design has changed, it is not recommended to reuse a ferrule. For example, the fitting body can get used again but not a Brass back ferrule.

The decision to reuse a ferrule is cost-effective and sensible. But one must ascertain that no damage has transpired, or a potential leak may arise.

Hardness and corrosion resistance of the back ferrule

It is imperative that a two-ferrule system builds a durable seal and also withstands corrosion. Since a 316 Stainless Steel back ferrule gets frequently employed in chemical processing and semiconductor industries, there is no scope for leakage or abrasion. The standard approach is to ensure that the front portion of the ferrule is adequately hard. Materials like AISI 316 Stainless Steel enhance the surface hardness.

A highly effective solution to boost corrosion resistance is plasma treatment. It involves carburizing the back ferrule with low-temperature plasma. The coating should be free of chromium nitride (Cr2N). This duplex layer protects the surface from corrosion.