... .TypeManufacturerSize1/2"-12",DN15-DN500MaterialDuctile iron,ash ironFinishPaint, Epoxy or Galvanization ApprovalFM/ULUsage1) Automatic sprinkler system for ... water supplying, gas supplying, heat supplying, etc.2) Industrial pipeline system on shipping, mine, oil field, textile, ... powder plant, etc.3) Pipeline system on subway station, railway station, airport, seaport, bridge, ...