Using push-fit heat-free connections is a prevention-through-design (PtD) process that addresses the risk of hot work (e.g., welding, joining, etc.) during the construction phase. This solution eliminates hot-work risks by using heat-free pipe joining. These innovative push-fit connections are ideal for use in confined spaces, reduce the need for flammable products storage, and eliminate fire risks. Compared to conventional practices of solvent-gluing PVC pipes or soldering copper pipes with a torch, the push-fit connections are considerably easier to use and do not require dangerous torches and solvents.

Push-fit connections offer the advantages of heat-free installation, improvement in on-site safety, enhancement of joint performance, shortened project time, and greater productivity and efficiency of labor. Use of push-fit connections does not require hot work permits at the job site, which means there is no need to carry oxy and acetylene bottles. These jointing systems offer a high-quality solution to health and safety regulations at job sites and are ideal for fast-track building systems. This jointing method relies on compressive strength and compression to provide an ideal connection. Selecting the correct specification and installation methods for push-fit jointing will offer proven benefits. 

These connections are available for gas and water application and in various tube sizes. They can be used in heating systems and chilled water applications within permitted temperatures and pressure. The versatility of these connections is useful when alteration, repair, or maintenance are required.

A mechanical mechanism is used to join the tube and fittings in push-fit connections, which can provide permanent or demountable joints. Push fitting requires tubes and fittings of the correct size that are clean and free from damage and imperfections. The tube can be cut with a tube cutter. In assembling the joint, one must ensure that the tube meets the tube stop and is fully inserted. The sealing ring inside the fitting creates a tight and permanent seal as it is compressed, making these connections appropriate for use inside finished walls and ceilings.

Push-fit connections are manufactured under various design and brand names, but they all follow the same principle for internal structure. Push-fit connections are designed for almost all pipe types.

The speed of making connections and ease of maintenance are perhaps the most important advantages of push-fit connections. Moreover, push-fit connections are heat-free connections, which eliminate the risk of fire incidents. Thus, the advantages of push-fit connections – improved on-site safety, enhanced joint performance, and shortened project time – offer greater productivity.

Sogand Hasanzadeh - SARMAD Research Group, University of Nebraska- Lincoln

Behzad Esmaeili, Ph.D. - SARMAD Research Group, University of Nebraska- Lincoln

Pouya Gholizadeh - SARMAD Research Group, University of Nebraska- Lincoln