The hydraulic calculative of canal of nodular cast iron is discussed
From;    Author:Stand originally
One, preface is in 20 centuries before 90 time, great majority feed pipe material is iron pipe of grey mouth casting, ** of basis our country big in the investigation data of service pipe material of the city, the proportion that place of iron pipe of grey mouth casting holds is ** . **% . In long-term use course, iron pipe of grey mouth casting is having atlas of standard of very mature design standard, design and construction standard. These produced unit of business, design, construction unit to bring very big advantage to conduit. Canal of nodular cast iron is to be in...