... .pipe fitting FM/UL approved 2.Materail: ductile iron 3.Groove as Victaulic standard 4.EPDM gaskt 5.DN15-DN500 pipe ... for fire protection on commercial, civil and municipal constructions like water supplying, gas supplying, heat supplying, etc.2) Industrial pipeline ... , mine, oil field, textile, powder plant, etc.3) Pipeline system on subway station, railway station, airport, seaport, bridge, ...