What are the typical advantage for Ductile iron Grooved fittings?

Here are some typical advantages of ductile iron grooved fittings for piping systems:

Strength

Ductile iron is strong while still being less brittle than cast iron. It stands up well to mechanical and thermal stresses.

Ductile iron has damping qualities that make it better able to absorb mechanical vibrations in the piping.

The ductile iron and optional linings/coatings protect against corrosion from water and some other chemicals.

The grooved connection creates a positive mechanical seal that is pressure-tight and will not leak or Come loose over time.

Grooved joints are quicker and simpler to install than threaded, welded or flanged fittings. No special tools or skills required.

Wide selection of tees, elbows, couplings etc. to meet any configuration need in a piping system.

Due to quicker installation and jointing, grooved systems have lower installation and lifetime costs than some alternatives.

Grooved fittings maintain full pipe ID and generate less headloss/friction than threaded or welding elbows/tees.

So ease-of-use, strength and economy make ductile iron grooved fittings a practical choice for water, gas and other piping applications.