... . 3. Standard: ANSI,ASME,DIN,API,ASTM grooved pipe fittings 90 degree elbow Ductile Iron Grooved Fittings With ASTM A536 standard, Including Coupling, Adaptor ... composite pipe, coated steel pipe, ductile iron pipe.6. Fire piping system Usage1) Automatic sprinkler system for protection on commercial,civil ...