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February 3, 2023

duplex tube fittings


Difference between 6Mo and duplex tube fittings

A 6MO grade is part of a super austenitic stainless steel grade. It has a superior chemical composition of chromium, nickel, molybdenum, carbon, copper, nitrogen, and other constituting alloys. They bolster superior corrosion resistance properties and bolster good tolerance to chloride pitting. Its crevice and stress cracking resistance are superb when compared to standard duplex tube specifications. Further, they have exceptional strength, formability, and weldability. The higher nitrogen content in the fittings offers higher tensile strength over standard austenitic grades. Its toughness and ductility provide ease of fabrication and are much more available when compared to standard super duplex tube fittings.

Duplex grade tube fittings are designed with an austenitic and ferritic microstructure. They have features of both characteristics that give them an edge in the industry. The nickel content in these fittings is lower than in the other grade. This gives them slightly lower corrosion resistance properties in the system. The duplex tube fittings have superior strength and performance than standard 6MO specifications. The tubes have higher resistance against chloride stress corrosion and tolerance to pitting and crevice resistance. Further, they have superior mechanical properties compared to the other grade.

duplex tube fittings

Advantages of super duplex tube fittings

Tube fittings of super duplex grade are used to influence the characteristics of the flow in the system. The dual-microstructure grade offers superior corrosion resistance properties and has good strength. They offer greater flexibility for connecting a system requiring fewer connections, which means fewer points of leakage. It can be easily installed compared to pipe fittings. Here, they are cut to length and deburred, followed by tightening with a nut. It is an important component in major plumbing systems. The items play a pivotal role to either combine, divert or reduce the supply in different applications.

The grade of tube fittings has good resistance to chloride stress cracking with enhanced tolerance to pitting in harsh environments. They work in a temperature range of up to 600 degrees F with a lower rate of thermal expansion. The combination of the structure gives them enhanced weldability and workability in the system. It has an ultimate tensile strength of 116ksi with a minimum yield strength of 80ksi and can be elongated by 15%. They also have a hardness of 310HRB max, making them a viable choice in an array of environments. The grade of fittings is available in an array of sizes and can also be customized to suit project requirements.

Reducing Union vs Union Tee

A reducing union is a threaded fitting that helps in the joining equipment. They can be easily connected and later separated without any horizontal movement. It primarily joins equipment of dissimilar sizes to create a leakproof sealing. The fastener is a standalone fitting that helps connect pieces of equipment to create an integral connection. A union tee is a fitting having a male and female union one or end to the main run. These tees are employed to distribute the flow across two outlets, and fluids come with an inlet section. They allow for an even flow of media in the system and can also be designed in reducing type specification.

Where are ferrule fittings used?

A ferrule fitting is a sealing component of a compression fitting assembly. The ferrules are designed using a variety of material that ranges from stainless steel to graphite. They are, however, manufactured using metals. The equipment is attractive as they are stable over a wide temperature range, and it bolsters compressive load carrying capacity. Typically, they are considered to leak prone and are engineered with an optimal seal with the fitting body.

It is a common feature in onshore oil and gas, shipbuilding, refinery unit instrumentation equipment, and power generator. They are also used in pharmaceutical equipment, semiconductors, vacuum applications, chemical processing, and petrochemical units. Apart from this, they are also seen in hardware, electronics, automotive, furniture, compressed gas, fire suppression, appliances, and lighting industries. Finally, they are also a feature in garden instruments, fiber optics, welding equipment, etc.

But how does it work? The nuts of the ferrule grade are screwed on the body and tightened against the tapered area of the body. Its edge is compressed tightly against the tube by curling inwards. The back ferrule is situated between the nut and the nut rolls up the front rolls and subsequently bites the tube. This helps in the creation of a leak proof sealing