Do ductile iron pipes have inner enamel?
For fire water and living water supply, low requirement is lined with cement mortar, some high can be lined with epoxy resin, epoxy ceramic lining, as well as cement mortar lining epoxy sealing layer (compromise is the price of blame).
If the market supply is indeed difficult, can be done by the owners, Design Institute of supplier relationship; if the design institute requires it to provide products can persist in wilfully and arbitrarily, the available information (if the market can not supply, design a hair ah).
Internal enamel ductile iron pipe is yes, but now there is almost no market (except for special process requirements), in the civil construction market, new materials, new technologies, new technologies can be replaced, there are many.
