Scope This specification specifies the requirements, quality assurance provisions and delivery standards for cast steel flanges with working pressure P3.0 MPa (hereinafter referred to as flanges). This specification applies to the design, manufacture and acceptance of pipe fittings and mechanical equipment interface flanges for water products. 2 Normative references The clauses in the following documents become the clauses of this specification through reference in this specification. For all dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this specification. However, the parties who reach an agreement based on this specification are encouraged to study whether to use the latest versions of these documents. For all undated references, the latest versions apply to this specification. GB/T 569-1965 Marine flange connection dimensions and sealing surfaces GB/T 1184-1996 Shape and position tolerances without tolerance values GB/T 1804-2000 General tolerances Tolerances of linear and angular dimensions without tolerances GB/T 11352-1989 General engineering cast carbon steel parts
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