Four Quality Alternatives to Welded Pipe Joining Methods

Piping systems are no longer installed the way they were 50 years ago. Strict quality requirements can be achieved and labor costs reduced by using non-welded pipe joining methods.

The main arguments in favor of using them are:

• reducing the cost of work on the connection;
• easier and faster to execute;
• higher response speed - to eliminate a gust on such a pipe, there is no need to wait for a specialist with a welding machine.

The first and most common method is to use fittings. These are special parts designed to connect two pipes to each other.

Fittings can also be installed in several ways.

The first option. Application of inner cones

The union consists of two flare flanges, one O-ring end cone, and one flat face cone. Both inner cones have back-up o-rings. Before expanding, flanges are put on the pipe, then the inner cones are placed in the pipe. The bolted connection brings the expanding tube and cone into contact with each other, providing an elastomeric seal at the flare and at the surface.

The second option. Using compression fittings

This connector is cold-installed in seconds by crimping the fitting onto the pipe using a hand-held hydraulic tool. Actual crimp cycle time varies by size but is typically 10 to 30 seconds.

Dignity:

• reliability;
• long-term resistance to vibration loads;
• the tightness is not inferior to the weld.

This method is in demand in areas where neither welding nor threading is possible. Suitable for pipes used to transport oils, grease, steam, gases.

The third option. Cold bending

Another alternative to a weld that is often used in the energy and industrial sectors is cold bending. Cold taps provide a cleaner solution for reversing flow in piping systems without restricting the design to using "off-the-shelf" 90°, 45° and 22½° fittings.

The benefits of this method:

• attractive appearance;
• tightness;
• fewer welds;
• pass parameters above;
• no negative impact on the metal.

Modern CNC machines are used for cold bending.

The fourth option. Carving

This is one of the most common and oldest non-welded pipe joining methods. It is good because it does not require expensive equipment and special skill. The disadvantages include:

• difficulties with threading in its absence;
• restrictions apply when used under pressure;
• quick wear with constant disassembly and reassembly of the connection.

Alternatives to welding are usually more efficient and require less preparation. The choice of method depends on your final needs and the initial data of the materials.