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HG/T 20635-2009

Chinese Standard: 'HG/T 20635-2009'
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HG/T 20635-2009English95 Add to Cart 0--15 minutes. Auto immediate delivery. Specification for ion of steel pipe flanges, gaskets and bolting (Class designated) Valid HG/T 20635-2009
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Detail Information of HG/T 20635-2009; HG/T20635-2009
Description (Translated English): Specification for ion of steel pipe flanges, gaskets and bolting (Class designated)
Sector / Industry: Chemical Industry Industry Standard (Recommended)
Classification of Chinese Standard: J15
Classification of International Standard: 23.040.60
Word Count Estimation: 37,387
Date of Issue: 2009-02-05
Date of Implementation: 2009-07-01
Older Standard (superseded by this standard): HG 20635-1997
Quoted Standard: HG/T 20615; HG/T 20623; HG/T 20627; HG/T 20628; HG/T 20630; HG/T 20631; HG/T 20632; HG/T 20633; HG/T 20634
Administrative Organization: ?PRC MIIT
Regulation (derived from): Engineering [ 2009 ] No. 27
Summary: This standard specifies the steel pipe flanges, gaskets and fasteners (Class Series) when used in conjunction with the general rules. This standard applies to HG/T 20615 ~ HG/T 20634 steel pipe flanges specified, gaskets and fasteners.

HG/T 20635-2009
Chemical Industry Standard
of the People's Republic of China
HG
Replacing HG 20635-1997
Specification for Selection of Steel Pipe Flanges,
Gaskets and Bolting
(Class designated)
钢制管法兰, 垫片, 紧固件选配规定
(Class 系列)
ISSUED ON. FEBRUARY 5, 2009
IMPLEMENTED ON. JULY 1, 2009
Issued by. Ministry of Industry and Information Technology of the People's
Republic of China
[Including Corrigendum/Modification confirmed in May 2012. Text in RED]
Contents
1. Scope ... 3 
2. Normative references ... 3 
3. Selection rules ... 3 
3.1 Pipe flanges ... 3 
3.2 Gaskets ... 5 
3.3 Bolting ... 9 
3.4 Flange joints ... 11 
Appendix A (Informative Appendix) Use Direction of the Gaskets for Pipe Flanges . 13 
1. Scope
This standard specifies the general rules for the selection of steel pipe flanges, gaskets
and bolting (C1ass designated).
This standard is applicable to the steel pipe flanges, gaskets and bolting specified in
HG/T 20615- HG/T 20634.
2. Normative references
The following standards contain provisions which, through reference in this text,
constitute provisions of this national standard. For dated reference, subsequent amendments
(excluding amending error in the text) to, or revisions of, any of these publications do not
apply. However, parties to agreement based on this standard are encouraged to research
whether the latest editions of these references are applied or not. For undated references, the
latest edition of the normative document is applicable to this national standard.
"Steel Pipe Flanges (Class Designated)" HG/T 20615
"Steel Pipe Flanges in Large Diameter (C1ass designated)" HG/T 20623
"Non-metallic Flat Gaskets for use with Steel Pipe Flanges (C1ass designated)" HG/T
"PTFE Envelope Gaskets for use with Steel Pipe Flanges (C1ass designated)" HG/T
"Metal Jacketed Gaskets for use with Steel Pipe Flanges (C1ass designated)" HG/T
"Spiral Wound Gaskets for use with Steel Pipe Flanges (C1ass designated)" HG/T 20631
"Covered Serrated Metal Gaskets for use with Steel Pipe Flanges (C1ass designated)"
HG/T 20632
"Metallic Ring Joint Gaskets for use with Steel Pipe Flanges (C1ass designated)" HG/T
"Bolting for use with Steel Pipe Flanges (C1ass designated)" HG/T 20634
3. Selection rules
3.1 Pipe flanges
3.1.1 The type and application scope of flanges shall meet the provisions of Table 3.1.4 of
HG/T 20615 and Table 3.1 of HG/T 20623. For its common scope, refer to Table 3.1.1.
temperature shall not exceed 450℃.
3.2.7 The asbestos and non-asbestos gaskets shall not be used in dangerous media or high
vacuum seal occasions.
3.2.8 As for the PTFE flat gaskets which have cold flow inclination, their sealing surface type
should be flat face type or their maximum service temperature should be no bigger than
100℃.
3.2.9 As for the standard pipe flanges whose nominal pressure is Class150, when semimetal
gaskets such as spiral wound gaskets, metallic envelope gaskets or metallic ring gaskets are
adopted, flanges (e.g.. weld neck flange) that have good rigidity shall be selected.
3.2.10 The inside diameter of the nonmetallic flat gaskets and wound gaskets listed in HG/T
20627 and HG/T 20631 may be larger than that of the corresponding flanges, if the inside
diameter of required gaskets (or inner rings) is equal to that of the flanges, the users may put
forward the following requirements.
1 Adopting integral type flanges, weld neck flanges or socket welding flanges.
2 Provide corresponding flange inside diameter to the gasket manufacturer as the inside
diameter of gaskets.
3.2.11 Table 3.2.11 is the selection table of gasket types.
Socket
welding
flange
Butt
welding
ring loose
flange
Blind flange
Semimetallic
Serrated
compound gaskets 150~2500
15~1500
(A, B) e
Raised face
Female
face/male face
Tongue
face/groove
face
3.2~6.3
Slip on neck
flange
Weld neck
flange
Long
hubbed
flanges
Integral
type flange
Socket
welding
flange
Blind flange
Metallic envelope
gaskets 300~900
f Raised face
1.6~3.2
(Carbon steel,
non-ferrous
metal)
0.8~1.6
(Stainless steel,
nickel-base
alloy)
Weld neck
flange
Long
hubbed
flange
Integral
type flange
Blind flange
Metallic Metallic ring gaskets 150~2500 700 Ring joint face
0.8~1.6
(Carbon steel,
chrome steel)
0.4~0.8
(Stainless steel)
Weld neck
flange
Long
hubbed
flange
Integral
type flange
Blind flange
a The service temperature scope of different natural rubber and synthetic rubber varies, refer to Appendix A of this standard
and HG/T 20627.
b The main raw materials for non-asbestos fiber rubber plate are different and their service temperature scope are also
different, you may refer to Appendix A of this standard and consult to the producer.
c When the reinforced flexible graphite plates are used for oxidizing media, the maximum service temperature shall be
450℃.
d The wound gaskets shall be combined according to the metallic tapes and filling materials, their service temperature scope
HG/T 20634 as well as Table 3.2.11 of this standard.
3.3.3 The commercial-grade bolting and special-grade bolting shall be used in accordance
with the provisions of Chapter 5 of HG/T 20634 and Table 3.2.11 of this standard.
3.3.4 As for the bolting used under low temperature, provisions shall be made on its
low-temperature impact tenacity.
3.3.5 When the bolting is used within the range of creep temperature, the loss of bolt load
caused by loose bolts shall be considered as this may influence the sealability of the flange
joints.
3.3.6 The bolting material used at high temperature shall have similar thermal expansion
coefficient as the flange material.
3.3.7 The low intensity bolting can only be used when the nominal pressure is less than or
equal to Class300; the flange joints that adopt nonmetallic flat gaskets shall not be used at
severe cyclic working condition. The applicable working temperature of Grade 5.6 low
intensity carbon steel bolting should not be greater than 200℃.
3.3.8 The hexagon head bolts are only applicable to occasions when the nominal pressure is
less than or equal to class150.
3.3.9 The bolting and screw nuts shall be combined according to the provisions of Table 5.0.4
of HG/T 20634 while the selection match between screw bolts and nuts shall meet the
provisions of Table 3.3.1.
3.3.10 The selection match of flanges, bolting and gaskets shall meet the provisions of Table
3.3.10.
Table 3.3.10 Selection Match of Bolting and Gaskets for Standard Flanges
Nominal pressure
Class Gasket type Strength level of screw bolt
·Nonmetallic flat gaskets
·PTFE envelope gaskets
Low strength, medium strength a, high
strength a
·Spiral wound gaskets
·Cladding with serrated gaskets Medium strength, high strength
·Metallic ring gaskets (not adopted generally) High strength
·Nonmetallic flat gaskets
·PTFE envelope gaskets Medium strength, high strength
·Spiral wound gaskets
·Cladding-with serrated gaskets or metallic flat gaskets Medium strength, high strength
·Metallic envelope gaskets
·Metallic ring gaskets High strength
·Reinforced flexible graphite plates
·High temperature vermiculite composite reinforcement
plates
Medium strength, high strength b
·Spiral wound gaskets
·Cladding-with serrated gaskets or metallic flat gaskets Medium strength, high strength
·Metallic envelope gaskets
·Metallic ring gaskets High strength
≥900
·Spiral wound gaskets
·Cladding-with serrated gaskets or metallic flat gaskets High strength
·Metallic envelope gaskets (not adopted generally)
·Metallic ring gaskets High strength
a Flat face gaskets shall be adopted or controlled tightening torque shall be controlled.
b Tightening torque shall be controlled.
3.4 Flange joints
3.4.1 The flange joint is consisted of a pair of flanges, bolting and gaskets. The flange
connection shall be selected according to the design conditions, fluid properties and sealing
requirements, and at the same time, the selection match of flanges, gaskets and bolting shall
Related standard:   HG/T 20627-2009  HG/T 20628-2009
   
 
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