( )ThRoUgh SIZE 500

oRDER NUmBER PRoCEDURE: Example – ZF 300LSg BoileR model wATeR (w) low PRessURe sTeAm (ls) hiGh PRessURe sTeAm (hs) nAT. GAs, miXed oR lP (G) no. 2 oR liGhTeR oils (l) comB. GAs/liGhT oil (lG) 300 ls G ZW – Welded Boiler Tube ZF