标准编号:	HG/T 21521-2005
中文名称:	垂直吊盖带颈对焊法兰人孔
英文名称:	Welding Neck Flange Manholes with Davit to Vertical Cover
行业分类:	HG    化工行业标准
发布机构:	工业和信息化部
发布日期:	2005-7-10
实施日期:	2006-1-1
标准状态:	被替代
被新标准替代:	HG/T 21521-2014 垂直吊盖带颈对焊法兰人孔
被替代日期:	2014-11-1
翻译语言:	英文
文件格式:	PDF
中文字符数:	10000 字
翻译价格(元):	700.00 元
交付时间:	付款后 1 个工作日

1 Scope



This standard specifies the types, basic parameters, dimensions, technical requirements and relevant service requirements of welding neck flange manholes with davit to vertical cover made of carbon steel and low-alloy steel.

This standard is applicable to welding neck flange manholes with davit to vertical cover, of which the nominal pressure PN is 2.5~6.3MPa, the working temperature and the corresponding maximum non-impact working pressure are limited within the range specified in Table 3-2 according to material category.



2 Normative References



GB/T 41-2000 Hexagon Nuts - Product Grade C

GB/T 95-2002 Plain Washers - Product Grade C

HG 20595-1997 Steel Pipe Welding Neck Flanges (European System)

HG 20601-1997 Steel Pipe Blank Flanges (European System)

HG 20606-1997 Nonmetallic Flat Gaskets for Steel Pipe Flanges (European System)

HG 20607-1997 PTFE Envelope Gasket for Steel Pipe Flanges (European System)

HG 20608-1997 Flexible Graphite Compound Gaskets for Steel Pipe Flanges (European System)

HG 20609-1997 Metal Envelope Gaskets for Steel Pipe Flanges (European System)

HG 20610-1997 Spiral Wound Gaskets for Steel Pipe Flanges (European System)

HG 20613-1997 Fasteners for Steel Pipe Flanges (European System)

HG/T 21514-2005 Type and Technical Specifications of Steel Manhole and Handhole



3 Types, Basic Parameters and Dimensions



The types, basic parameters and dimensions of manhole are detailed in Figure 3 and Tables 3-1~3-3.



Figure 3 Manhole Type



Table 3-1 Detail List

1 Scope
2 Normative References
3 Types, Basic Parameters and Dimensions
4 Technical Requirements
5 Marking Examples