IEC 61518 pdf download

IEC 61518 pdf download

IEC 61518 pdf download Mating dimensions between differential pressure (type) measuring instruments and flanged-on shut-off devices up to 413 bar (41,3 MPa)
This International Standard is applicable to differential pressure (type) measuring instruments(instrument) with a shut-off device (manifold) directly bolted on to them.
This standard specifies mating dimensions and tolerances,threads, bolts,and gaskets for amaximum allowable working pressure of 41,3 MPa (413 bar) at 38 °C.
This standard does not apply to assemblies that provide additional sealing elements (adapters)between the instrument and the manifold.
Where the possibility exists, shut-off devices shall be mounted on either side of the instrument,and all connections shall then meet this standard.
Elements, such as flanged coupling joints, may apply this standard or parts thereof to increasestandardization at the discretion of the supplier and the end-user.
This standard is only valid for instrument and manifold flanges manufactured from a metallicmaterial with yield strength equal to, or larger than,190 N/mm2.
2 Normative references
The following normative documents contain provisions which,through reference in this text,constitute provisions of this International ‘Standard. For dated references,subsequentamendments to,or revisions of,any of these publications do not apply. However,parties toagreements based on this International Standard are encouraged to investigate the possibilityof applying the most recent editions of the normative documents indicated below.For undatedreferences,the latest edition of the normative document referred to applies. Members of lECand lso maintain registers of currently valid International Standards.
Iso 48:1994,Rubber,vulcanized or thermoplastic – Determination of hardness (hardnessbetween 10 IRHD and 100 IRHD)
ISo 898-1:1999,Mechanical properties of fasteners made of carbon steel and alloy steel -Part 1: Bolts,screws and studs
ISO 1629:1995,Rubber and latices – Nomenclature
ISO 3506 (ll parts), Mechanical properties of corrosion-resistant stainless-steel fasteners
ISO 3601 -1 :1 988, Fluid systems – Sealing devices – O-rings – Part 1: Inside diameters, crosssections, tolerances and size identification code
ISO 3601 -3:1 987, Fluid systems – Sealing devices – O-rings – Part 3: Quality acceptance criteria
ASME B1 8.3.1 M:1 986 (R1 993), Screws, socket head cap (metric series)
ASME B1 8.2.1 :1 996, Square and Hex Bolts and Screws Inch Series
ASTM A1 93:1 999, Specification for alloy steel and stainless steel bolting materials for hightemperature service
ASTM A449:1 993, Specification for quenched and tempered steel bolts and studs
3 Dimensions
Dimensions in figures and tables are in millimetres, except where stated otherwise.
Leak-tight connection between the differential (type) measuring instrument and the flanged instrument manifold depends upon the conformance to the dimensions and the tolerances.
3.1 Connection dimensions at the differential pressure (type) instrument
See figure 1 .
3.2 Connection dimensions at the shut-off device
Two designs for the manifold facings are recommended:
– Type A: design with an extended spigot (see figure 2);
– Type B: design without an extended spigot (see figure 3).

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