Cone and Thread Fittings

What are Cone and Thread Fittings?

Cone and thread (C&T) connectors are often used for “middle pressures” of up to 15,000 psi but have been utilized successfully in very high-pressure situations (up to 150,000 psi).

The tube is chamfered (or “coned”) and countersunk into the fitting, creating a secure and tight connection. Assembling the tubing tightly against the joint necessitates precision-formed tube ends with good surface polish and threading to achieve a tight seal. All these steps must be completed on-site, which adds considerable time and money to installing C&T fittings. Nonetheless, C&T fittings, like compression fittings, can be disassembled and reassembled for servicing.

It’s not always possible to replicate or maintain the same results with these procedures. They can also cause the ID of the tube to become contaminated with metal shavings and cutting oil, requiring additional cleaning steps. C&T fittings require specialized equipment, and their application necessitates specialized training. Furthermore, since the threading of the joints occurs under unregulated settings, vibration might cause the fittings to loosen.

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What is the purpose of a groove in the collar?

A slotted male thread gland nut is required to relieve connections under medium pressure. Over-pressure can be alleviated, and a blown seal can be seen in Male High-Pressure Coned and Threaded Connection before the tubing is at risk of being blown out. As a result, the weep holes must be left unblocked at all times, and any evidence of leakage from a weep hole must be thoroughly probed.

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Is Cone and Thread Instrumentation Adapters suitable for medium-pressure applications?

Cone and thread fittings have been used for years in a wide range of oil and gas operations due to their reliability. These fittings provide dependable performance in medium-pressure applications when fitted with special antivibration glands and installed by skilled personnel.

Moreover, Female Medium-Pressure Coned and Threaded Connections can be utilized in various applications where cone and thread fittings are typically selected.

Male High-Pressure Coned and Threaded Connection for medium and high-pressure applications

What are the types of Cone and Thread Fittings?

A second common form of fitting is the cone and thread combination. In addition to being able to be ordered in several different alloys, they also offer several design elements that make them particularly well-suited for use in medium and high-pressure settings. For years, cone and thread fittings have been the go-to for high-pressure, demanding applications.

The gland, collar, female port, and weep hole on a cone and thread fitting allow service technicians to check for leaks and ensure the fitting was installed correctly. High-pressure uses often necessitate using a tube with a thicker wall.

Female Medium-Pressure Coned and Threaded Connection for Up to 60 000 (4134 bar) working pressure and suitable for ISO 15156/ NACE applications

Medium-pressure vs. high-pressure cone and thread Instrumentation fittings

Although medium and high-pressure fittings may look identical at first glance, their construction is distinct and best used for various purposes.

To withstand temperatures of up to 100 degrees Celsius and pressures of up to 20,000 pascals, the bore sizes of a “medium-pressure” connector are relatively big. Instead, the bore sizes of “high-pressure” fittings are much smaller. The increased strength of the fitting because of incorporating more material within it allows it to function at pressures of up to 60,000 psi.

While medium and high-pressure tube fittings are incompatible without an adaptor, there are several exceptions. Never exceed the recommended operating pressure of any particular component, regardless of an adapter or fitting type, as doing so might cause system failure and equipment damage.

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Advantages of Cone and thread (C&T) connections

Dependable medium- and high-pressure performance can be expected from the cone and threaded connections. Components with a pressure that needs more than 8000 psi are recommended to use this type of fitting due to its strong pressure resistance (550 bar). These cone and thread couplings are sealed with an interference fit between metal parts. A sealant or o-ring is unnecessary. A tube is crammed into a conical shape in this layout. The tube is collared by threading a collar onto it, and the gland nut presses the tube within the sleeve such that the coned surface is flush with the sleeve.