SIST EN ISO 228-2:2003

Pipe threads where pressure-tight joints are not made on the threads - Part 2: Verification by means of limit gauges (ISO 228-2:1987)

This part of EN ISO 228 specifies the verification, by means of limit gauges, of cylindrical threads, the dimensions and tolerances of which are given in part 1.

Rohrgewinde für nicht im Gewinde dichtende Verbindungen - Teil 2: Prüfung mit Grenzlehren (ISO 228-2:1987)

Filetages de tuyauterie pour raccordement sans étanchéité dans le filet - Partie 2: Vérification par calibres a limites (ISO 228-2:1987)

Classification. Systèmes de l'indice de classe. Erreurs admissibles pour chaque classe. Conditions de mesure. Conditions d'utilisation. Méthodes d'essai. Marquage. Documentation d'accompagnement.

Cevni navoji za zveze, ki ne tesnijo z navoji – 2. del: Kontrola s kalibri (ISO 228-2:1987)

General Information

• Status: Published
• Publication Date: 31-Oct-2003
• ICS: 21.040.30 - Special screw threads
• Technical Committee: IFEK - Ferrous metals
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Nov-2003
• Due Date: 01-Nov-2003
• Completion Date: 01-Nov-2003
• Directive: 89/106/EEC - Construction products
• Directive: 97/23/EC - Directive 97/23/EC of the European Parliament and of the Council of 29 May 1997 on the approximation of the laws of the Member States concerning pressure equipment
• Mandate: M/071 - Mandate to CEN for standardization in the field of Pressure equipment
• Mandate: M/131 - Mandate to CEN/CENELEC concerning the execution of standardization work for harmonized standards on pipes, tanks and ancillaries, not in contact with water intended for human consumption
• Ref Project: EN ISO 228-2:2003 - Pipe threads where pressure-tight joints are not made on the threads - Part 2: Verification by means of limit gauges (ISO 228-2:1987)

Relations

• Replaces: SIST ISO 228-2:2001 - Pipe threads where pressure-tight joints are not made on the threads -- Part 2: Verification by means of limit gauges
• Effective Date: 01-May-2012

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 228-2:2003
01-november-2003
Cevni navoji za zveze, ki ne tesnijo z navoji – 2. del: Kontrola s kalibri (ISO 228-
2:1987)
Pipe threads where pressure-tight joints are not made on the threads - Part 2:
Verification by means of limit gauges (ISO 228-2:1987)
Rohrgewinde für nicht im Gewinde dichtende Verbindungen - Teil 2: Prüfung mit
Grenzlehren (ISO 228-2:1987)
Filetages de tuyauterie pour raccordement sans étanchéité dans le filet - Partie 2:
Vérification par calibres a limites (ISO 228-2:1987)
Ta slovenski standard je istoveten z: EN ISO 228-2:2003
ICS:
21.040.30 Posebni navoji Special screw threads
SIST EN ISO 228-2:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 228-2:2003

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SIST EN ISO 228-2:2003
EUROPEAN STANDARD
EN ISO 228-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2003
ICS 21.040.30
English version
Pipe threads where pressure-tight joints are not made on the
threads - Part 2: Verification by means of limit gauges (ISO 228-
2:1987)
Filetages de tuyauterie pour raccordement sans étanchéité Rohrgewinde für nicht im Gewinde dichtende Verbindungen
dans le filet - Partie 2: Vérification par calibres à limites - Teil 2: Prüfung mit Grenzlehren (ISO 228-2:1987)
(ISO 228-2:1987)
This European Standard was approved by CEN on 27 December 2002.
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, Slovak Republic, 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 ISO 228-2:2003 E
worldwide for CEN national Members.

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SIST EN ISO 228-2:2003
EN ISO 228-2:2003 (E)
Foreword
The text of ISO 228-2:1987 has been prepared by Technical Committee ISO/TC 5 "Ferrous
metal pipes and metallic fittings" of the International Organization for Standardization (ISO) and
has been taken over as EN ISO 228-2:2003 by Technical Committee ECISS/TC 29 "Steel tubes
and fittings for steel tubes", the secretariat of which is held by UNI.
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 August 2003, and conflicting national
standards shall be withdrawn at the latest by August 2003.
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.
Endorsement notice
The text of ISO 228-2:1987 has been approved by CEN as EN ISO 228-2:2003 without any
modifications.
2

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SIST EN ISO 228-2:2003
IS0
INTERNATIONAL STANDARD
228-2
Second edition
1987-08-H
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION
ORGANISATION INTERNATIONALE DE NORMALISATION
MEXflYHAPOflHAR OPrAHM3A~Mfl l-l0 CTAHflAPTM3A~MM
Pipe threads where pressure-tight joints are not made
on the threads -
Part 2 :
Verification by means of limit gauges
Filetages de tu yauterie pour raccordemen t sans &ancMit& dans le filet -
Partie 2 : Wrification par calibres 5 limites
Reference number
IS0 228-2 : 1987 (E)

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SIST EN ISO 228-2:2003
Foreword
IS0 (the International Organization for Standardization) is a worldwide federation of
national standards bodies (IS0 member bodies). The work of preparing International
Standards is normally carried out through IS0 technical committees. Each member
body interested in a subject for which a technical committee has been established has
the right to be represented on that committee. International organizations, govern-
mental and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the IS0 Council. They are approved in accordance with IS0 procedures requiring at
least 75 % approval by the member bodies voting.
International Standard IS0 228-2 was prepared by Technical Committee ISO/TC 5,
Ferrous metal pipes and metallic fittings.
This second edition cancels and replaces the first edition (IS0 228-2 : 19801, of which it
constitutes a minor revision.
Users should note that all International Standards undergo revision from time to time
and that any reference made herein to any other International Standard implies its
latest edition, unless otherwise stated.
0 International Organization for Standardization, 1987
Printed in Switzerland

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SIST EN ISO 228-2:2003
IS0 228-2 : 1987 (E)
INTERNATIONAL STANDARD
Pipe threads where pressure-tight joints are not made on
the threads -
Part 2 I
Verification by means of limit gauges
Table 1
1 Scope and field of application
Symbol Explanation
This part of IS0 228 specifies the verification, by means of limit
gauges, of cylindrical threads, the dimensions and tolerances
Width of clearance groove at the major and minor
b3
of which are given in IS0 228-l. diameter respectively of the thread profile with trun-
cated flanks
For industrial applications (see for example IS0 1179), it may be
d= D 1 Basic major diameter of the thread
I
I
necessary to carry out additional checks.
- 1,280 654 P : Basic minor diameter of the
1 d’ = D1 1 iredad
Since this 55O profile has different elements to be verified, it is
- d - 0,646 327 P : Basic pitch diameter of the
necessary to provide for several GO and several NOT GO
1 d2 = D2 1 thread
gauges :
m Distance between the middle of the tolerance zones
TR of the threaded ring gauge and TcP of the GO
a) the threaded GO gauges (see clauses 6 and 7) shall en-
check plug
sure that the profile of the machined piece does not exceed
Nominal value of b3
n
the maximum of material provided for by the tolerances ap- I I
I
plied to the dimensions of the profile defined by IS0 228-l;
P Pitch
I I I
Displacement of the clearance groove with trun-
b) the threaded NOT GO gauges for the threads of the
1 ’ ( cated flanks
I
pieces (see clauses 6 and 7) fix the minimum material limit
S Tolerance on b3
on the flanks of the thread. I I I
Tolerance on the pitch diameter of GO and NOT GO
threaded check plugs and wear check plugs
Reference checks may be carried out in specialized
NOTE -
laboratories.
Tolerance on the pitch diameter of the external
I Td2 I thread
I
Tolerance on the pitch diameter of the internal
1 TD2 1 thread
2 References
Tolerance on the pitch diameter of GO and NOT GO
threaded plug gauges
I TpL I
IS0 228-1, Pipe threads where pressure- tight joints are not
Tolerance on the pitch diameter of GO and NOT GO
made on the threads - Part I : Designation, dimensions and
threaded ring gauges
I TR I I
tolerances.
= 0,147 84 P : Twice the radial height of rounding
at crest and root of thread
I u I I
IS0 1179, Pipe connections, threaded to IS0 228- 7, for plain
Average amount available for the permissible wear
end steel and other metal tubes in industrial applications.
wGO
of GO threaded plug gauge and GO threaded ring
WJW
IS0 1502, IS0 general purpose metric screw threads -
Gauging. Average amount available for the permissible wear
WNG
of NOT GO threaded plug gauge and NOT GO
threaded ring gauge
Distance between the middle of the tolerance zone
ZPL
TPL of the GO threaded plug gauge and the lower
3 Symbols and explanations
limit of the thread
Distance between the middle of the tolerance zone
The symbols used in this part of IS0 228 are the same as those
TR of the GO threaded ring gauge and the upper
used in IS0 1502 for the IS0 thread gauges, plus some addi-
limit of the thread
tional symbols (n, S, u), as shown in table 1.
1

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SIST EN ISO 228-2:2003
IS0 228-2 : 1987 (E)
4.1.2.2 Use
4 Function, control and use of gauges
The threaded GO check plug screwed by hand, without ex-
4.1 Gauges for external threads and their check
cessive force, shall pass through the new solid threaded GO
ring gauge.
plugs
The threaded NOT GO check plug screwed by hand, without
4.1.1 Solid GO threaded ring gauge
excessive force, may enter into both ends of the new solid
threaded GO ring gauge, but not more than one turn of
thread. l)
4.1.1.1 Function
Wear check plug for solid threaded GO ring gauge
The threaded GO ring gauge checks the virtual size of the exter- 4.1.3
nal thread on the GO side (gauging the virtual pitch diameter),
i.e. it checks the maximum material limit of the pitch diameter,
4.1.3.1 Function
taking into account deviations of form (departures from round-
ness and lack of straightness of the thread axis over the gauge
The wear check plug is used to ascertain that the pitch diameter
length) and pitch errors, helix variations and errors in the flank
of the threaded GO ring gauge has not exceeded the wear limit.
angles, which produce an apparent enlargement of the pitch
It embodies the pitch diameter of the threaded GO ring gauge
diameter (virtual pitch diameter). In addition, this gauge checks
at the prescribed limit of wear.
whether the length of the straight flank is adequate, i.e. that
the rounding at the root of the profile does not encroach too far
4.1.3.2 Use
upon the flank of the thread.
The wear check plug screwed by hand, without excessive
This gauge shows the maximum material limit.
force, may enter into both ends of the threaded GO ring gauge,
but not more than one turn of thread?
Checking with the threaded GO ring gauge is essentially in ac-
cordance with the Taylor principle (see IS0 1502 : 1978, sub-
If it can be screwed in more than one turn of thread, the thread-
clause 7.1.1).
ed GO ring gauge no longer meets the specifications.
4.1.4 Solid threaded NOT GO ring gauge
4.1.1.2 Control
The solid threaded GO ring gauge manufactured according to
4.1.4.1 Function
the prescribed sizes shall be checked using the threaded GO
and NOT GO check plugs and should be controlled regularly
The threaded NOT GO ring gauge is intended to check whether
with the wear check plug.
the actual pitch diameter exceeds the specified minimum size.
The checking with the threaded NOT GO ring gauge does not
correspond to the Taylor principle when checking rigid machin-
If the NOT GO check plug is not used, other provisions shall be
ed pieces. In cases of non-rigid machined pieces, the departure
made so as to ensure that the maximum size of the pitch
from the Taylor principle is of less importance because of the
diameter of the threaded GO ring gauge is not exceeded.
flexibility of the pieces.
4.1.1.3 Use
4.1.4.2 Control
The threaded GO ring gauge screwed by hand, without ex-
The solid threaded NOT GO ring gauge manufactured accord-
cessive force, shall pass over the whole length of the thread. If
ing to the prescribed sizes shall be checked using the threaded
this is not possible, the thread does not comply with the
GO and NOT GO check plugs and should be controlled regular-
specifications.
ly with the wear check plug.
If the NOT GO check plug is not used, other provisions shall be
4.1.2 Threaded check plugs for new solid threaded GO
made to ensure that the
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