Standard No.:	HG/T 21520-2005
English Name:	Hubbed Slip-on-welding Flange Manholes with Davit to Vertical Cover
Chinese Name:	垂直吊盖带颈平焊法兰人孔
Professional Classification:	HG    Professional Standard - Chemistry
Issued on:	2005-7-10
Implemented on:	2006-1-1
Status:	superseded
Superseded by:	HG/T 21520-2014 Hubbed Slip-on-welding Flange Manholes with Davit to Vertical Cover
Superseded on:	2014-11-1
Language:	English
File Format:	PDF
Word Count:	4000 words
Price(USD):	100.0
Delivery:	via email in 1 business day

1 Scope This standard specifies the types, basic parameters, dimensions, technical requirements and relevant service requirements of hubbed slip-on-welding flange manholes with davit to vertical cover made of carbon steel, low alloy steel and stainless steel. This standard is applicable to hubbed slip-on-welding flange manholes with davit to vertical cover, of which the nominal pressure PN is 1.0~1.6MPa, the working temperature and the corresponding maximum non-impact working pressure are limited within the range specified in Table 3-2 according to the material category. 2 Normative References GB/T 41-2000 Hexagon Nuts - Product Grade C GB/T 95-2002 Plain Washers - Product Grade C HG 20594-1997 Hubbed Slip-on-welding Steel Pipe 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 Gaskets for Steel Pipe Flanges (European System) HG 20608-1997 Flexible Graphite Compound 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

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