IEC 61518:2001 pdf download

IEC 61518:2001 pdf download.Mating dimensions between differential pressure
(type) measuring instruments and flanged-on shut-off devices up to 413 bar (41,3 MPa).
ISO 3601.1:1988, Fluid systems — Sealing devices – 0•nngs — Part I Inside diameters. cross• sections, tolerances and size identification code
ISO 3601-3:1987, Fluid systems — Sealing devices — 0-rings — Part 3: Quality acceptance criteria
ASME 818.3.1 M: 1986 (Ri 993), Screws, socket head cap (metric series) ASME 818.2.1:1996. Square and Hex Bolts and Screws Inch Series
ASTM Al 93:1999, Specification for alloy steel and stainless steel bolting materials for high- tempera ture 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 dilferential (type) measuring instrument and tile 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-oil device
Two designs br 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).
NOTE Typ. 0 d.sign may also b. suitabi. fog diff.r.nhial pr.asur. (typ.I transmitl.rs. wh.r. th. conn.ctin dimensions are not in accordance with ni. standard. The user 3 reaon.Ie for ensuring conipalibility log IrSflsmillers with ditterenl dimensions.
3.3 Seal rings
The specifications for the flat ring are those of tables 1 and 2.
The 0-rings are in accordance with the ISO standards quoted.
Materials and temperature limits for the flat rings and the 0-ring are for reference only. It is the responsibility of the user to ensure compatibility between the selected gasket ring material and the process requirements, such as pres5ure, temperature, and chemical compatibility.
3.3.2.2 0-Ring
No suitable ISO-standardized O•ring is available for the manifold without the spigot. It is the user’s responsibility to apply 0-rings according to a local standard.
3.4 Flange connection (see figures 4 and 5)
Flange connections, as described, shall only be used within the defined limits for pressure and temperature of the instrument and manifold assembly.
4 InstallatIon
Before mounting the instrument onto the manifold, it is necessary to check whether mating dimensions and alignment of the mating faces of the flanges of the instrument are within the requirements of this standard.
In an area of 28 mm around each process port, all surfaces shall be clean and without damage.
After the sealing rings have been installed between the manifold and the instrument, care should be taken to tighten all Screws at the connection evenly.
For PTFE or graphite seals, It is unavoidable that some of the gasket material creeps between the metallic surfaces. After tightening of the bolts, the gap between the metallic surfaces of the flanged manifold and the instruments shall be less than 0,2 mm, The thread engagement shall be at least 0,8 times the thread diameter.
The required bolt length L should be stated as shown below (flange thickness b):
a) For blind threaded transmitters:
— Lmin.=b÷9mm
— Lmax.=b+l4mm;
b) For through threaded transmitters:
— Lmin.-b+9mm,
5 MaterIal for the bolts
The material for the bolts shall be chosen from the following materials, which are minimum material requirements.
— Mediumcarbon steel, type 1. or low-carbon steel, type 2, accordIng to ASTM A449.
— Carbon steel, quenched and tempered, Class 8.8. according to ISO 898-1.
— Austenitic steel, carbide solution treated and strain-hardened, according to ASTM A193, Group B8, Class 2.
— Austenitic steel, extra strain-hardened, according to ISO 3506, Group A2 or A4, Class 70.
Marking on the top of the bolts shall indicate conformance with the applicable standard.
Flange thickness b:
一full flange design: minimum 10 mm
一split flange design with 2 kidney type flanges: minimum 14 mm
b Construction of insert to suplers standard. May also be integral with the flange body.
NOTE Not 10 scale.
Figure 2 – Connection of a shut-off device type A (with spigot) – Dimensions.