As per the corrosivity of delivered water, anti-corrosion linings of the ductile iron pipes and fittings can be divided into three categories:
* Standard lining: Applicable for most raw water and portable water;
* Reinforced anti-corrosion lining: Applicable for water which can attack ordinary cement (soft water, slightly acidic water or highly abrosive water);
* Special lining: Applicable for very special cases or corrosive water (e.g. industrial discharged water).
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