1.0.1 This standard is formulated to standardize the design of welding neck flange manholes with hinged cover, reduce repetitive design work, ensure product quality and improve comprehensive benefits.
1.0.2 This standard is applicable to the design of steel welding neck flange manholes with hinged cover with a nominal pressure of PN16~PN63 in chemical, petrochemical plants and other similar plants.
1.0.3 In addition to this standard, the design of welding neck flange manholes with hinged cover shall also meet those specified in the relevant current national standards.
2 Structural type and size
2.0.1 The structural type of welding neck flange manholes with hinged cover shall meet the requirements of Figure 2.0.1.
1 General provisions 2 Structural type and size 3 Technical requirements 4 Mark and examples Normative standards
1 General provisions
1.0.1 This standard is formulated to standardize the design of welding neck flange manholes with hinged cover, reduce repetitive design work, ensure product quality and improve comprehensive benefits.
1.0.2 This standard is applicable to the design of steel welding neck flange manholes with hinged cover with a nominal pressure of PN16~PN63 in chemical, petrochemical plants and other similar plants.
1.0.3 In addition to this standard, the design of welding neck flange manholes with hinged cover shall also meet those specified in the relevant current national standards.
2 Structural type and size
2.0.1 The structural type of welding neck flange manholes with hinged cover shall meet the requirements of Figure 2.0.1.
Contents of HG/T 21518-2014
1 General provisions
2 Structural type and size
3 Technical requirements
4 Mark and examples
Normative standards
