SIST EN 562:2003

SLOVENSKI STANDARD
01-december-2003
1DGRPHãþD
SIST EN 562:1995
Oprema za plamensko varjenje - Manometri za varjenje, rezanje in sorodne
postopke
Gas welding equipment - Pressure gauges used in welding, cutting and allied processes
Gasschweißgeräte - Manometer für Schweißen, Schneiden und verwandte Prozesse
Matériel de soudage aux gaz - Manometres utilisés pour le soudage, le coupage et les
techniques connexes
Ta slovenski standard je istoveten z: EN 562:2003
ICS:
17.100 Merjenje sile, teže in tlaka Measurement of force,
weight and pressure
25.160.30 Varilna oprema Welding equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 562
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2003
ICS 17.100; 25.160.30 Supersedes EN 562:1994
English version
Gas welding equipment - Pressure gauges used in welding,
cutting and allied processes
Matériel de soudage aux gaz - Manomètres utilisés pour le Gasschweißgeräte - Manometer für Schweißen, Schneiden
soudage, le coupage et les techniques connexes und verwandte Prozesse
This European Standard was approved by CEN on 17 March 2003.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2003 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 562:2003 E
worldwide for CEN national Members.

Contents
page
Foreword.3
1 Scope .3
2 Normative references .3
3 Terms and definitions.4
4 Pressure.4
4.1 Unit of pressure.4
4.2 Maximum scale reading .4
4.3 Maximum pressure mark.5
5 Manufacturing requirements .5
5.1 Materials.5
5.2 Design and dimensions.5
6 Safety .9
7 Marking .10
8 Tests.10
8.1 General.10
8.2 Design and manufacturing standard .10
8.3 Accuracy.10
8.4 Torsion test.11
8.5 Bend test.12
8.6 Case vent test.13
8.7 Strength .13
8.8 Flammability test.13
Bibliography .14
Foreword
This document (EN 562:2003) has been prepared by Technical Committee CEN/TC 121 "Welding", the secretariat
of which is held by DS.
This European Standard shall be given the status of a national standard, either by publication of an identical text or
by endorsement, at the latest by November 2003, and conflicting national standards shall be withdrawn at the latest
by November 2003.
This document supersedes EN 562: 1994.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal,
Slovakia, Spain, Sweden, Switzerland and the United Kingdom.
1 Scope
This European Standard specifies requirements for Bourdon-tube pressure gauges normally used with compressed
gases at pressures up to 300 bar in welding, cutting and allied processes. It also covers use for dissolved acetylene
and for liquefied gases under pressure.
It does not cover gauges for acetylene in acetylene manufacturing plants.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For
dated references, subsequent amendments to or revisions of any of these publications apply to this European
Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the
publication referred to applies (including amendments).
EN 472:1994, Pressure gauges — Vocabulary.
EN 29539, Materials for equipment used in gas welding, cutting and allied processes (ISO 9539:1988).
EN ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads - Part 1: Dimensions,
tolerances and designation (ISO 228-1:2000).
EN ISO 4589-2:1999, Plastics - Determination of burning behaviour by oxygen index - Part 2: Ambient-temperature
test (ISO 4589-2:1996).
ISO 7-1, Pipe threads where pressure-tight joints are made on the threads - Part 1: Dimensions, tolerances and
designation.
ISO 497, Guide to the choice of series of preferred numbers and of series containing more rounded values of
preferred numbers.
ISO 7000:1989, Graphical symbols for use on equipment—Index and synopsis.
ISO 10102, Assembly tools for screws and nuts—Double headed open-ended engineers' wrenches—Length of
wrenches and thickness of the heads.
)
ANSI/ASME B1.20.1, Pipe threads, general purpose (inch) .

) nd
Standard published and available at: ANSI – American National Standards Institute, 11 West 42 Street, New York, NY
10036.
3 Terms and definitions
For the purposes of this European Standard, the terms and definitions given in EN 472:1994 and the following
apply.
3.1
bourdon-tube pressure gauges
device incorporating flexible tubes with direct indication by pointer and graduated scale of the pressure being
measured
3.2
dial
plate or area on which the scale is marked
3.3
pointer stop
projection that stops the travel of the pointer
4 Pressure
4.1 Unit of pressure
All pressures given are gauge (effective) pressures in bar.
4.2 Maximum scale reading
Where practical the maximum scale reading for a particular gas and pressure level shall be selected from the
values given in Table 1. Where it is not practicable the maximum scale reading shall be selected from the R10
series of preferred numbers or more rounded values given in ISO 497.
Table 1 — Maximum scale reading
Values in bar
Pressure level Acetylene Oxygen and other gases
2,5
1 6
low-pressure (LP) 1,6 10
2,5 16
high-pressure (HP)
40 315
(see NOTES 1, 2 and 3)
NOTE 1 250 bar pressure gauge for use with CO and compressed gas cylinders filled to a maximum settled filling pressure of
185 bar at 15 °C.
NOTE 2 315 bar pressure gauge for use with compressed gas cylinders filled to a maximum settled filling pressure of 230 bar
at 15 °C.
NOTE 3 400 bar pressure gauge for use with compressed gas cylinders filled to a maximum settled filling pressure of 300 bar
at 15 °C.
4.3 Maximum pressure mark
2)
The maximum operating pressure shall be indicated on the dial by a symbol or coloured mark and shall not
exceed ¾ of the maximum scale reading.
5 Manufacturing requirements
5.1 Materials
5.1.1 General
The materials of the pressure gauge components liable to come into contact with the gas shall have adequate
resistance to the chemical action of the gas under operating conditions.
Bourdon tubes and other parts in contact with acetylene gas shall conform to EN 29539.
5.1.2 Oxygen pressure gauges
Bourdon tubes and other parts in contact with the gas shall be resistant to the chemical action of the oxygen and
shall not be flammable under operating conditions.
Thread sealants or sealing rings shall also be resistant to the chemical action of the oxygen and shall not be
flammable under operating conditions.
Components in contact with oxygen gas shall conform to EN 29539.
Only lubricants suitable for use in oxygen at the service pressure and temperature shall be used.
5.2 Design and dimensions
5.2.1 Operational requirements
5.2.1.1 Accuracy
The pressure gauge accuracy shall be at least that of class 2,5, i.e. with a maximum deviation within the tolerance
2,5 % (of full scale reading) over the entire scale.
5.2.1.2 Strength
Those parts of the pressure gauge that are in contact with the gas shall not burst or leak when tested to a pressure
corresponding to 2,5 times the maximum scale reading (see 8.7).
5.2.1.3 Torsion
After the application of the torque of 10 Nm according to 8.4.1 for a period of not less than 30 s, the pressure
gauge shall satisfy the conditions of accuracy specified in 5.2.1.1.
After the application of the torque of 25 Nm according to 8.4.2 for a period of not less than 30 s, the pressure
gauge shall be leak-tight at a pressure corresponding to the maximum scale reading.

2) For pressure gauges used with regulators to EN ISO 2503 the maximum pressure mark is normally p2 for low-pressure
gauges and p for high-pressure gauges, as defined in EN ISO 2503:1998, Table 4.
5.2.1.4 Bending
After the application of the load of 1 kN according to 8.5, the pressure gauge shall be leak-tight to atmosphere at a
pressure corresponding to the maximum scale reading.
5.2.2 Dimensions
The nominal size is based on the diameter of the casing (dimension A in Figure 1 and Figure 2). The values 40, 50
and 63 are standardized.
The dimensions shall be in accordance with Figure 1 and Table 2, or Figure 2 and Table 3 as appropriate. The
connecting dimensions are shown in Figure 3 and Table 4.
Figure 1 — Pressure gauge with bottom entry
Table 2 — Dimensions of threads pressure gauge with bottom radial entry
Nominal sizeAB
Parallel thread Tapered thread
[degree] [mm]
G1/8 B R1/8 or 1/8-27 NPT EXT
40 270 or or
G1/4 B R1/4 or 1/4-18 NPT EXT
G1/8 B R1/8 or 1/8-27 NPT EXT
50 270 or or
G1/4 B R1/4 or 1/4-18 NPT EXT
63 270 G1/4 B R1/4 or 1/4-18 NPT EXT
The thread connection (see Figure 3) according to the type shall conform to the following standards:
Parallel thread – EN ISO 228-1; Tapered thread (Symbol R) – ISO 7-1; Tapered thread (Symbol NPT) –
ANSI/ASME B1.20.1.
Type B Type E Type F
Key
1 Fixing holes F
Figure 2 — Pressure gauge with rear entry
Table 3 — Dimensions of threads pressure gauge with rear entry
Nominal sizeA B C D F
max max min
[degree] [mm] Parallel thread Tapered thread [mm] [mm] [mm]
G1/8 B R1/8 or 1/8-27 NPT EXT
40 270 42 or or 61 51 3,6
G1/4 B R1/4 or 1/4-18 NPT EXT
G1/8 B R1/8 or 1/8-27 NPT EXT
50 270 52 or or 68 60 3,6
G1/4 B R1/4 or 1/4-18 NPT EXT
63 270 67 G1/4 B R1/4 or 1/4-18 NPT EXT 81 75 3,6
The thread connection (see Figure 3) according to the type shall conform to the following standards:
Parallel thread – EN ISO 228-1; Tapered thread (Symbol R) – ISO 7-1; Tapered thre
...