Which type of mechanical joint does the MJ type refer to in water service contexts?

The term "MJ type" refers to a Mechanical Joint, which is commonly used in water service contexts. Specifically, MJ joints utilize a specially designed gasket that is compressed to create a seal when the joint is bolted together. This type of joint is particularly beneficial for providing a flexible connection that can accommodate some movement or misalignment in the pipeline, minimizing stress on the pipes.

In water service applications, MJ joints are typically used for ductile iron or PVC pipes and are favored for their ease of installation and maintenance. They can be easily disassembled in the field, allowing for repairs without cutting pipe segments, which contributes to their popularity in the industry.

Through their design, MJ joints enhance the integrity of water systems by preventing leaks while allowing for slight adjustments in alignment during installation. This functionality makes them a practical choice for various water service environments.