ISO 1609:2020 pdf download Vacuum technology — Dimensions of non-knife edge flanges
1 Scope
This document specifies the dimensions of non-knife-edge flanges and collars used in vacuumtechnology.
The dimensions ensure interchangeability between bolted, clamped and rotatable flanges:
a)whether the assembly be homogeneous (for example,bolted flanges or clamped flanges) or
heterogeneous (for example, bolted flanges assembled with clamped flanges either by means ofbolts or clamps or by means of bolts and rotatable flanges).
b) whether the sealing rings used with the flanges be elastomer O-rings or metal sealing rings,
provided that they are compatible with the linear sealing loads given in Annex A.
2Normative references
There are no normative references in this document.
3Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and lEC maintain terminological databases for use in standardization at the following addresses:-ISo online browsing platform: available at https://www.iso.org/obp
-IEC Electropedia: available at http://www.electropedia.org/
3.1
nominal bore
value intended to both identify the flange and specify the largest practical size of tubing that can beaccommodated by the flange
[SOURCE:ISO 3669:2017,3.2]
Note 1 to entry:The tables provide a series of nominal bores intended to identify the flanges or collars.
Note 2 to entry: These values follow the progression of the R10 series of preferred numbers (see lS0 3) fromwhich only the term 12,5 has been eliminated.
Note 3 to entry:The values of nominal bore belonging to the R5 series of preferred numbers (see lSO 3) are asfollows:10,16,25,40,63,100,160,250,400,630 and 1000.They correspond to values intended to permit, in thelong term,the adoption of a reduced series of nominal bores.
Note 4 to entry: The nominal bores 63 and 160 given in Tables 1, 2 and 3 correspond to practical diameters of70 mm (or 65 mm) and 153 mm respectively.
3.2
diameter of bolt holes
value for the diameter of bolt holes
Note 1 to entry : Cis derived from the bolt diameters, D, as given in ISO 273.
3.3
bolt diameterD
diameter of the bolts
Note 1 to entry:For a flange of given nominal bore, the bolt diameter, D, is the same for both bolted and rotatableflanges.
3.4
mating face
area in the form of a ring, the surface finish and the flatness of which make the sealing of the jointpossible.
Note 1 to entry:The minimum mating face is defined by diameter E in Table1 and S in Table 2, and by diameter Fin Tables 1 and 2.
Note 2 to entry:The flange sealing face shall be flat, and no part of the flange shall project in relation to this plane.3.5
collar widthG
value for the width of the collar onto which the clamp hooks
Note 1 to entry: The value for the width depends on the system of clamps used and should not be greaterthan 2,5 mm.
3.6
outside diameterH
value for the outside diameter of bolted and rotatable flanges
Note 1 to entry: The dimensions given for the outside diameter are compatible with the requirement that the boltwashers (ISO 887 – small series) shall not project beyond the outer circumference of the flange.
3.7
number of bolt holesn
value for the number of bolt holes
Note 1 to entry: The linear sealing loads tabulated in Annex A for a given bolt stress are derived from the valuesof the number of bolt holes n.
3.8
inner diameter for the contact area of clampsu
value for the inner diameter for the contact area of clamps
Note 1 to entry: So as to take into account the diversity of the clamping systems which may be used, for exampleon collars with welding necks, the maximum inner diameter of the annulus reserved for contact with the clampsis defined by diameter U.ISO 1609:2020 pdf download