BS EN 12560-2:2013 pdf download

BS EN 12560-2:2013 pdf download.Flanges and their joints —Dimensions of gaskets for Class-designated flanges Part 2: Spiral wound gaskets for use with steel flanges.
BS EN 12560-2 specifies the dimensions, design, types. designation, materials and marking of spiral wound gaskets for use with type A flat face or type B raised face flange facings complying with EN 1759-1 for the following Class designations:
Class 150, to Class 1 500 for nominal sizes DN lSto DN 600. and
Class designation 2 500 up to and including DN 300.
The centering rings for the spiral wound gaskets according to this standard are sized for use with anipenal bolting.
The dimensions of spiral wound gaskets for tongue and groove flange facing types and spigot and recess flange facing types to EN 1759-1 ace not induded ii this standard.
Such gaskets may be available, however, for these types of flange and the purchaser Is advised to consult the manulacturer as to their availability. Similarly, for slip-on a screwed flange types, the manufacturer should be consulted about availability.
NOTE Olnensions or other types of gasket for use with flanges complying with the requwements of EN 1759-1 are given liEN 12560-1, EN 12560-3. EN 12560-4 and EN 12560-5. EN 12560.6 and EN 12560-7.
2 Normative references
Not applicable.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
ON
alphanumeric designation of size for components of a pipework system, which Is used for reference purposes.
comprised of the letters ON followed by a dimensionless whole number which is indirectly related to the
physical size, in millimetres, of the bore or outside diameter of the end connections
Note I to entry The number following the letters ON does not represent a measurable value and should not be used for calculation purpoaes except where specified lithe relevant standard.
(SOURCE: EN 1S06708:1995,21, definition slightly modified)
3.2
NPS
alphanumeric designation of size for components of a pipework system, which is used for reference purposes, comprised of the letters NPS followed by a dimensionless number which is indirectly related to the physical size of the bore or outside diameter of the end connections
Note 1 to entry: The number folowing the letters NPS does not represent a measurable value and shodd not be used for calculation purposes except where specified io the relevant standard.
(SOURCE: EN 1759-1:2004, 3.3, definitIon slightly modified)
The inner windings shall have a minimum of three plies of preformed metal strip without filler The inner plies shall be spot-welded about thew circumference with a minimum o4 three welds, each no further than 75 mm apart.
The outer windings shall have a minimum of three plies of preformed metal without filler. The outer two plies shall be spot-welded about their circumference with a minemum 04 three terminal welds, with no more than 40 mm distance between the first and terminal welds.
Four additional loose preformed metal windings beyond the termmal weld may be used to retain the gasket into the centering ring.
7 Gasket compressbon
Gaskets for ON 15, DN 20 and DN 25 ii Class 150, Class 300 and Class 600 shal be constructed so that an applied uniform bolt stress of 172 MPa, based on the nominal bolt root diameter, will compress the gasket to a thickness of 3,2 mm to 3,4 mm Al other gasket sizes and classes shall be constructed so that a uniform bolt stress of 207 MPa will compress the gasket to a thickness of 3.2 mm to 3,4 mm.
8 Gasket types
Gaskets shall be either of the following types:
a) sealing element type with centering nrig and inner ring (designation: Type C/I); or
b) sealing element type with centering nng only (designation: Type C/O),
All gaskets shall have a centering ring. The centering ring thickness shall be from 2,97 mm to 3,33 mm and suitably grooved on the Niside diameter so as to retain the spiral wound sealing element, Inner rings shall be furnished with all spiral wound gaskets having PTFE (potytetraftuoroethylene) filler material.
Inner rings for flexible graphite filled spiral wound gaskets shall be furnished unless the purchaser specifies otherwise, All filler matenal inner rings shall be furnished in spiral wound gaskets for:
ON 600 in Class 900;
ON 300 and larger in Class 1 500;
ON 100 and larger In Class 2 500.
9 Dimensions
The diameters of spiral wound gaskets with centering ring, for use with types A and B flange facings, shall be as elven in Table 1. For gaskets with an inner ring, the sealing element outside diameter and centenng ring outside diameter shall be as given in Table 1 and the ‘iner ring inside diameter shall be as given ii Table 2.
NOTE Type A and B liange facings are shown in EN 1759-1.