Standard No.:	HG/T 21521-2005
Chinese Name:	垂直吊盖带颈对焊法兰人孔
English Name:
Professional Classification:	G91 Chemical machinery and equipment parts
Professional Classification:	HG Professional Standard - Chemistry
ICS Classification:	11.120.99 Other standards related to pharmaceutics
Issued by:
Issued on:	2005-07-10
Implemented on:	2006-01-01
Status:	ABOLISHED
Replace By:	HG/T21521-2014 Welding Neck Flange Manholes with Davit to Vertical Cover
Replace By Date:	2014-11-01
Language:	English
File Format:	PDF
Word Count:	18500 words
Price(USD):	555 (USD)
Delivery:	via email in 1-5 business day

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