HG/T 20614-2009 English PDF (HGT20614-2009)

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HG/T 20614-2009: Specification for ion of steel pipe flanges, gaskets and bolting (PN designated)
HG/T 20614-2009
Chemical Industry Standard
of the People's Republic of China
HG
Replacing HG 20614-1997
Specification for Selection of Steel Pipe Flanges,
Gaskets and Bolting
(PN designated)
(PN 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
2. Normative References ... 3 
3. Selection Specification ... 3 
Appendix A (Informative) Operating Instructions of the Pipe Flange for Gaskets ... 13 
1. Scope
This standard specifies the general rules for selection of the steel pipe flange, gaskets and
bolting (PN designated).
This standard is applicable to the steel pipe flange, gaskets and bolting which are
specified in the HG/T 20592 - HG/T 20613.
2. Normative References
The following provisions contained in the following standards are turned into the
provisions of this national standard by being referred in this national standard. For date
reference, the subsequent amendments to (excluding amending error in the text) or revisions
of, any of these publications do not apply. And parties to agreements based on this standard
are encouraged to investigate the possibility of applying the most recent editions of the
standards indicated below. For undated references, its latest edition referred to applies.
HG/T 20592 "Steel Pipe Flanges (PN Designated)"
HG/T 20606 "Non-metallic Flat Gaskets for use with Steel Pipe Flanges (PN
designated)"
HG/T 20607 "PTFE Envelope Gaskets for use with Steel Pipe Flanges (PN designated)"
HG/T 20609 "Metal Jacketed Gaskets for use with Steel Pipe Flanges (PN designated)"
HG/T 20610 "Spiral Wound Gaskets for use with Steel Pipe Flanges (PN designated"
HG/T 20611 "Covered Serrated Metal Gaskets for use with Steel Pipe Flanges (PN
designated)"
HG/T 20612 "Metallic Ring Joint Gaskets for use with Steel Pipe Flanges (PN
designated)"
HG/T 20613 "Bolting for use with Steel Pipe Flanges (PN designated)"
3. Selection Specification
3.0.1 Pipe Flange
1 Type and application range of the flange shall meet the requirements of the Table 3.1.4
in HG/T 20592.
2 Type and application range of the sealing surface of the flange shall meet the
requirements of Table 3.2.2 in HG/T 20592.
3 Materials for flange shall meet the requirements of Chapter 4 in HG/T 20592. As for
the forging, casting or plates for other pressure-bearing equipments, if its composition and
performance are not lower than those of the materials which are listed in Table 4.0.1 of HG/T
20592, the aforesaid ones may be used for the preparation of the flange. The maximum
allowable working pressure of the flange shall meet the requirements of the corresponding
materials which are listed in the table.
4 The maximum allowable working pressure (gauge pressure) of the flange under the
working temperature shall meet the requirements of Table 7.0.1-1 - Table 7.0.1-9 in HG/T
20592.
5 When the two flanges of the flanged joint are of different pressure-temperature rating,
the rated value of the flanged joint shall not exceed the lower one of the two.
6 Under the severe cyclic working condition, weld neck flange or integral type flange
3.0.2 Gasket
1 Type and application range of the gasket shall meet the requirements of HG/T 20606 -
HG/T 20612.
2 Type and material of gasket shall be selected according to such requirements as fluid,
working condition (pressure and temperature) as well as sealing condition of the flanged joint.
The type of the sealing surface of the flange and the surface roughness shall be correspondent
with the type and material of the gasket.
3 Seal load of the gasket shall be correspondent with such requirements as rated value of
the flange, sealing surface type, service temperature and sealing requirements of the joint.
And the material, strength as well as tightening of the bolting shall be correspondent with
such requirements as type and material of the gasket as well as sealing condition of the
flanged joint.
4 PTFE envelope gaskets shall not be used in such places that it is vacuum or the
materials for its embedding layer is easy to be corrosive. Generally, PMF type is used for it is
useful to reduce the hold-up liquid in the pipe. PFT type is used for that the nominal
dimension is larger than or equal to DN350.
5 When asbestos or flexible graphite gasket are used for the stainless steel flange and
nickel base alloy flange, content of chloride ion of the gasket material shall not
exceed50×10-6.
6 When expanded graphite material is used for the oxidative medium, maximum service
temperature shall not exceed 450 . ℃
7 Asbestos and non asbestos gasket shall not be used for the utmost or high hazardous
medium and high vacuum seal condition.
8 As PTFE flat gasket which is of the tendency to cold flow, flat face, male-female face
or tongue and groove face should be adopted for its sealing surface type.
9 As for the flange that its nominal pressure is less than or equal to PN16, such rigid
flange structural type as weld neck flange shall be adopted when such semimetal gasket or
metal ring gasket as spiral-wound gasket and metal cladding gasket are adopted.
10 The internal diameter of the nonmetallic flat gaskets and internal ring of the wound
gasket may be possibly larger than the internal diameter of the corresponding flange. If the
aforesaid internal diameter of the gasket (or internal ring) shall be flush with the internal
diameter of the flange, the following requirements shall be proposed by the user.
1) Integral type flange, welding neck flange or socket welding flange shall be
adopted;
2) The corresponding internal diameter of the flange shall be supplied as the internal
diameter of the gasket to the gasket manufactory.
11 Selection of the gasket type is listed in Table 3.0.2.
(Continued)
Gasket type
Nominal
pressure
PN
Nominal
dimension
DN
(A, B)
Maximum
service
temperature,
( )℃
Sealing
surface
typeg
Surface roughness of
the sealing surface
Ra (μm)
Flange type
Semimetal
Wound
gasket 16-160
10-2000
Raised face
Male-female
face
Tongue and
groove face
3.2-6.3
Slip on neck flange
Weld neck flange
Integral type flange
Socket welding flange
Blind flange
Serrated
combined
gasket
16-160 f
Raised face
Male-female
face
Tongue and
groove face
3.2-6.3
Slip on neck flange
Weld neck flange
Integral type flange
Socket welding flange
Blind flange
Semimetal/metal
Metal
envelope
gasket
25-100 10-900 d Raised face
1.6-3.2
(carbon steel and
non-ferrous metal))
0.8-1.6
(stainless steel and
nickel base alloy)
Weld neck flange
Integral type flange
Blind flange
Metal Metal ring gasket 63-160 15-400 700
Ring joint
face
0.8-1.6
(Carbon steel and
chrome steel)
0.4-0.8
(Stainless steel)
Weld neck flange
Integral type flange
Blind flange
Note. a The service temperature scope of all kinds of India rubber and synthetic rubber are different. It is shown in
Appendix A and HG/T 20606.
b Compositions and service temperature scope of the main raw materials of the non asbestos fiber rubber plate are
different. It is shown in Appendix A and can be known from the manufactur...