Scope of application and materials for human and hand standards

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HG/T21514~21535-2005: Steel manholes and handholes; HG/T21515-2005: Manholes for normal pressure conditions. Application scope: Carbon steel manholes for normal pressure conditions (tube section material Q235-A·F), designed for use in environments with no impact pressures of less than 0.07 MPa, and at working temperatures ranging from 0 to 250°C. HG/T21516-2005: Application range of rotary cover-type butt-weld flange manholes: Carbon steel and stainless steel (tube section materials: Q235-B, 20R, 00Cr19Ni10, 0Cr18Ni9, 0Cr18Ni10Ti, 00Cr17Ni14Mo2, 0Cr17Ni12Mo2). The nominal pressure is less than or equal to 0.6 MPa; the temperature depends on the material used. HG/T21517-2005 Rotary cover with neck, flat-welded flange manhole – Application range: carbon steel, low-alloy steel, stainless steel (tube section materials: Q235-B, 20R, 16MnR, 15CrMoR, 00Cr19Ni10, 0Cr18Ni9, 0Cr18Ni10Ti, 00Cr17Ni14Mo2, 0Cr17Ni12Mo2). Nominal pressure: 1.0~1.6 MPa; temperature depends on the material used. HG/T21518-2005 Rotating cover with neck, butt-welded flange manhole – Application range: carbon steel, low-alloy steel (section materials 20R, 16MnR, 15CrMoR, 16MnDR, 09MnNiDR). Nominal pressure: 2.5~6.3 MPa; temperature is determined by the material. HG/T21519-2005: Scope of application for vertically hanging cover-type butt-welded flange manholes: Carbon steel, stainless steel (Q235-B, 20R, 16MnR, 00Cr19Ni10, 0Cr18Ni9, 0Cr18Ni10Ti, 00Cr17Ni14Mo2, 0Cr17Ni12Mo2). The nominal pressure is less than or equal to 0.6 MPa; the temperature depends on the material used. HG/T21520-2005 Vertical cover with neck, flat-welded flange manhole – Application range: carbon steel, low-alloy steel, stainless steel (Q235-B, 20R, 16MnR, 15CrMoR, 00Cr19Ni10, 0Cr18Ni9, 0Cr18Ni10Ti, 00Cr17Ni14Mo2, 0Cr17Ni12Mo2). Nominal pressure: 1.0~1.6 MPa; temperature depends on the material used. HG/T21521-2005 Vertical cover with neck, butt-welded flange manhole – Application range: carbon steel, low-alloy steel (tube section materials 20R, 16MnR, 15CrMoR, 16MnDR, 09MnNiDR). Nominal pressure: 2.5~6.3 MPa; temperature is determined by the material. Application range of HG/T21522-2005 horizontal lifting cover-type butt-weld flange manholes: carbon steel, stainless steel (Q235-B, 20R, 00Cr19Ni10, 0Cr18Ni9, 0Cr18Ni10Ti, 00Cr17Ni14Mo2, 0Cr17Ni12Mo2); nominal pressure less than or equal to 0.6 MPa, with the temperature determined by the material. HG/T21523-2005 Horizontal cover flanges with necks and flat-welded manholes: Suitable for use with carbon steel, low-alloy steel, and stainless steel (Q235-B, 20R, 16MnR, 15CrMoR, 00Cr19Ni10, 0Cr18Ni9, 0Cr18Ni10Ti, 00Cr17Ni14Mo2, 0Cr17Ni12Mo2). The nominal pressure ranges from 1.0 to 1.6 MPa; the temperature range is determined by the material used. HG/T21524-2005 Horizontal cover with neck, butt-welded flange manhole – Application range: carbon steel, low-alloy steel (tube section materials 20R, 16MnR, 15CrMoR, 16MnDR, 09MnNiDR). Nominal pressure: 2.5~6.3 MPa; temperature is determined by the material. HG/T21525-2005: Application range for atmospheric pressure rotary handle quick-opening manholes – Carbon steel (shell section material Q235-A·F); operating pressure without impact less than 0.07 MPa; the lower limit of operating temperature is 0°C, while the upper limit ranges from 60 to 150°C. HG/T21526-2005: Application range for oval rotating cover quick-opening manholes – Carbon steel (shell section material Q235-B); nominal pressure less than or equal to 0.6 MPa; operating temperatures are specified in the table. HG/T21527-2005 Application scope of quick-opening manholes for rotary arch covers: carbon steel (shell section material Q235-B), with a nominal pressure of less than or equal to 0.6 MPa; the operating temperature is specified in the table. HG 21594~21604-1999: Stainless steel manholes and handholes. HG/T21595-1999: Applications for stainless steel manholes under normal pressure – operating pressure less than or equal to 0.07 MPa, operating temperature ranging from 0 to 100°C. HG/T21596-1999: Stainless steel manholes with rotating covers – nominal pressures of 0.6, 1.0, 1.6, 2.5, and 4.0 MPa; operating temperature ranging from -20 to 100°C. HG/T21597-1999: Stainless steel manholes with rotating arch covers and quick-opening mechanisms – nominal pressure of 0.6 MPa, operating temperature ranging from -20 to 200°C; it can also be used at operating temperatures of 300°C under conditions of increased temperature and reduced pressure. Application range of HG/T21598-1999 horizontal-lid stainless steel manholes: nominal pressures of 0.6, 1.0, 1.6, 2.5, and 4.0 MPa; operating temperature range of >-20 to 100°C, and with increased temperature and reduced pressure they can be used at an operating temperature of 300°C. HG/T21599-1999: Scope of application for vertical-lid stainless steel manholes – Nominal pressures of 0.6, 1.0, 1.6, 2.5, and 4.0 MPa; operating temperature range of >-20 to 100°C, and with increased temperature and reduced pressure it can be used at operating temperatures up to 300°C. Application range of HG/T21600-1999 elliptical quick-opening stainless steel manholes: nominal pressure of 0.6 MPa, operating temperature ranging from >-20 to 200°C; with temperature increases or decreases, they can be used at an operating temperature of 300°C as well.