SIST EN 10344:2025

SLOVENSKI STANDARD
01-februar-2025
Fitingi iz temprane železove litine s prižemnimi priključki za železne cevi
Malleable cast iron fittings with compression ends for steel pipes
Tempergussfittings mit Klemmanschlüssen für Stahlrohre
Raccords à compression en fonte malléable pour tubes d'acier
Ta slovenski standard je istoveten z: EN 10344:2024
ICS:
23.040.40 Kovinski fitingi Metal fittings
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 10344
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2024
EUROPÄISCHE NORM
ICS 23.040.40
English Version
Malleable cast iron fittings with compression ends for steel
pipes
Raccords à compression en fonte malléable pour tubes Tempergussfittings mit Klemmanschlüssen für
en acier Stahlrohre
This European Standard was approved by CEN on 15 November 2024.

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 CEN-CENELEC 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 CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 10344:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Types of fittings . 9
5 Materials . 9
5.1 General . 9
5.2 Material of the fitting body . 9
5.3 Elastomers . 9
6 Corrosion protection. 9
6.1 General . 9
6.2 Hot dip galvanizing .10
6.2.1 General .10
6.2.2 Chemical composition of the hot dip zinc coating .10
6.2.3 Coating mass per surface unit and layer thickness.10
6.2.4 Surface conditions of the hot dip zinc coating .10
6.3 Non-metallic coating .10
6.4 Dangerous substances .11
6.4.1 General .11
6.4.2 Hot dip zinc coating .11
6.4.3 Dispatch conditions of finished fittings .11
6.4.4 Non-metallic coating .11
7 Design .11
7.1 General .11
7.2 Geometrical characteristics .11
7.3 Minimum bore .12
7.4 Pipe threads .12
7.5 Surfaces .12
7.6 Transition fittings .12
7.6.1 Transition with jointing thread .12
7.6.2 Transition for polyethylene pipe .12
7.6.3 Transition for other pipes .12
7.7 Load transmission .12
8 Performance requirements .13
8.1 Yield strength .13
8.2 Tightness .13
8.2.1 Internal pressure strength .13
8.2.2 Leak tightness .13
8.3 Pressure and temperature limits .13
8.4 Dimensional tolerances .14
8.5 Reaction to fire .14
8.6 Durability .14
8.6.1 Durability of fittings .14
8.6.2 Durability of elastomeric seals .14
8.7 Dangerous substances .14
9 Test requirements . 14
9.1 General . 14
9.2 Component test . 16
9.2.1 Testing of malleable cast iron . 16
9.2.2 Testing of plastic components . 16
9.2.3 Testing of sealing materials . 17
9.2.4 Testing of hot dip zinc coating . 17
9.2.5 Analysis of polycyclic aromatic hydrocarbons . 17
9.2.6 Testing of non-metallic coating . 17
9.2.7 Material tests . 17
9.2.8 Visual inspection . 17
9.2.9 Geometrical characteristics . 18
9.2.10 Leak tightness of fitting body . 18
9.3 Assembly tests . 18
9.3.1 General . 18
9.3.2 Leak tightness under internal pressure . 18
9.3.3 Leak tightness under pressure cycling . 19
9.3.4 Leak tightness after repeated movements . 19
9.3.5 Resistance to pull-out. 22
9.3.6 Resistance to vibrations . 23
9.3.7 Leak tightness after temperature changes . 23
9.3.8 Behaviour in case of negative pressure (vacuum) . 23
9.3.9 Leak tightness under high temperature for gas installation inside of buildings . 24
9.3.10 Surface protection – Testing by salt spray test . 24
10 Assessment of conformity . 24
11 Designation of fittings . 25
11.1 Elements of the designation for ordering . 25
11.2 Additional notes on designation of size . 25
11.3 Examples of designation . 25
12 Marking . 26
Annex A (normative) Surface protection - Salt spray test . 27
Bibliography . 28
European foreword
This document (EN 10344:2024) has been prepared by Technical Committee CEN/TC 459 “ECISS -
European Committee for Iron and Steel Standardization” , the secretariat of which is held by AFNOR.
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 June 2025, and conflicting national standards shall be
withdrawn at the latest by June 2025.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United
Kingdom.
Through its sub-committee CEN/TC 459/SC 10 “Steel tubes, and iron and steel fittings” (secretariat: UNI).
1 Scope
This document specifies the requirements for the design, performance and testing of fittings made of
malleable cast iron (see also Clause 5, Materials) with compression ends for steel pipes.
This document applies to steel piping systems for different application fields, such as supply and
distribution of gas, water for general purposes (e.g. irrigation) as well as for human consumption,
aqueous liquids and pressurized air.
This document contains requirements and tests relating to compression fittings which can be connected
to smooth walled steel pipes. The fittings can also incorporate other types of connection, such as threaded
ends in conformance with EN 10226-1, flanged ends, compression ends for connection for pipes other
than steel, and can also take on various structural shapes, such as straight adaptor piece, elbow or
T-piece. Their range of sizes covers nominal sizes DN 10 to DN 100 (fitting size 3/8 to 4).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 549, Rubber materials for seals and diaphragms for gas appliances and gas equipment
EN 681-1, Elastomeric seals — Materials requirements for pipe joint seals used in water and drainage
applications — Part 1: Vulcanized rubber
EN 682, Elastomeric Seals — Materials requirements for seals used in pipes and fittings carrying gas and
hydrocarbon fluids
EN 806-2, Specification for installations inside buildings conveying water for human consumption — Part 2:
Design
EN 1562, Founding — Malleable cast irons
EN 1775:2007, Gas supply — Gas pipework for buildings — Maximum operating pressure less than or equal
to 5 bar — Functional recommendations
EN 10204, Metallic products — Types of inspection documents
EN 10216-1, Seamless steel tubes for pressure purposes — Technical delivery conditions — Part 1: Non-
alloy steel tubes with specified room temperature properties
EN 10217-1, Welded steel tubes for pressure purposes — Technical delivery conditions — Part 1: Electric
welded and submerged arc welded non-alloy steel tubes with specified room temperature properties
EN 10226-1, Pipe threads where pressure tight joints are made on the threads — Part 1: Taper external
threads and parallel internal threads — Dimensions, tolerances and designation
EN 10226-3, Pipes threads where pressure tight joint are made on the threads — Part 3: Verification by
means of limit gauges
EN 10255, Non-alloy steel tubes suitable for welding and threading — Technical delivery conditions
EN 10284, Malleable cast iron fittings with compression ends for polyethylene (PE) piping systems
EN 13501-1, Fire classification of construction products and building elements — Part 1: Classification
using data from reaction to fire tests
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)
EN ISO 228-2, Pipe threads where pressure-tight joints are not made on the threads — Part 2: Verification
by means of limit gauges (ISO 228-2)
EN ISO 1460, Metallic coatings — Hot dip galvanized coatings on ferrous materials — Gravimetric
determination of the mass per unit area (ISO 1460)
EN ISO 2178, Non-magnetic coatings on magnetic substrates — Measurement of coating thickness —
Magnetic method (ISO 2178)
EN ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
(ISO 6892-1)
EN ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests (ISO 9227)
EN ISO 19892, Plastics piping systems — Thermoplastics pipes and fittings for hot and cold water — Test
method for the resistance of joints to pressure cycling (ISO 19892)
ISO 2859-1, Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by
acceptance quality limit (AQL) for lot-by-lot inspection
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1 General terms
3.1.1
fitting
connecting piece for pipes and other piping accessories, consisting of one or more parts
3.1.2
compression fitting
connecting piece for pipes and other piping accessories, equipped with minimum one compression end,
sealing by elastomeric gaskets on smooth walled pipe ends
3.1.3
transition fitting
fitting jointing different types of pipe and/or comprising different types of outlet
3.1.4
end-load-resistant joint
joint which can resist axial loads without additional external mechanical pipe support
3.1.5
non-end-load-resistant joint
joint which cannot resist axial loads without additional external mechanical pipe support
3.1.6
fitting size
nominal size of the connecting (steel) pipe(s)
Note 1 to entry: For transition fittings, the size designation follows the type of the outlet.
3.1.7
fitting body
main pressure-bearing part of a fitting
3.1.8
outlet
end of a fitting for the purpose of connection with a pipe by a compression end or other threaded piping
accessories
3.1.9
run
two principal axially aligned outlets of a tee
3.1.10
branch
side outlet of a tee
3.1.11
compression end
end in which a mechanical joint is formed by the tightening of a nut or fastening of a flange to compress
a grip or locking ring onto the outside wall of the tube to create a pressure tight connection
Note 1 to entry: The assembled joint should be understood as being demountable.
Note 2 to entry: The purpose of a compression end is to connect pipe and fitting body using a compression
system, consisting of a body and a nut or flange, by using common tools.
3.1.12
grip
locking ring
ring that holds the pipes in place and prevents pull out from the joint
3.1.13
minimum bore
smallest internal diameter of a fitting measured at any cross-section
3.1.14
smooth wall
smooth pipe surface in the seal and clamping area which is unshaped, undamaged and untreated
Note 1 to entry: Cleaning and deburring is not regarded as treatment.
3.1.15
demountability
characteristic of a fitting to disconnect and re-assemble the joint without destroying the fitting body and
the pipe, except the components of the jointing system, such as the sealing and grip or locking rings
3.1.16
jointing thread
pipe threads according to EN 10226-1 where pressure-tight joints are made on threads
3.1.17
fastening thread
pipe threads according to EN ISO 228-1 where pressure-tight joints are not made on threads
Note 1 to entry: For fastening threads, the pressure-tight joint is made by compressing two sealing surfaces
outside the threads, optionally by using an appropriate seal.
3.1.18
component test
test to verify the performance of a fitting carried out on the non-assembled fitting or fitting parts
3.1.19
assembly test
test to verify the fitness for purpose of an assembled fitting connected with the pipe(s)
3.2 Terms relating to movability
3.2.1
angular deflection
maximum angle α subtended between the axes of the fitting and the connected pipe when the assembly
still remains leak-tight following two full deflections by ±α in relation to the starting position
Note 1 to entry: α is according to manufacturer's specifications.
3.2.2
axial movability
axial path within which the fitting remains leak-tight following two full path changes by ±a in relation to
the starting position
Note 1 to entry: a is according to manufacturer's specifications.
3.2.3
torsional angle
maximum angle β within the joint can twist around its axis, when the assembly still remains leak-tight
following two full twists by ±β in relation to the starting position
Note 1 to entry: β is according to manufacturer's specifications.
3.2.4
resistance to pull-out
characteristic of the joint to withstand axial forces, applied mechanically or through internal pressure,
while remaining leak-tight
3.3 Terms relating to pressure and temperature
3.3.1
allowable operating pressure
PFA
maximum operating pressure of the connected pipe joint(s) in continuous function
3.3.2
allowable operating temperature
TFA
maximum operating temperature of the connected pipe joint(s) in continuous function
4 Types of fittings
Types and shapes of fittings are to the discretion of the manufacturer and therefore not standardized or
limited regarding measurements.
5 Materials
5.1 General
All materials of fitting body and components shall be resistant against the medium of the respective
application.
NOTE In case of potable water, national hygienic requirements can apply.
5.2 Material of the fitting body
The material used for the fitting body shall be malleable cast iron conforming to EN 1562. The grade of
material used shall be selected from the following grades:
Grade EN-GJMW-400-5 for fittings in white heart malleable cast iron;
Grade EN-GJMB-350-10 for fittings in black heart malleable cast iron.
5.3 Elastomers
The material of elastomeric sealing rings used in fittings shall be chosen depending on the specific
application. For potable water application, it shall be chosen according to EN 681-1 and for gas supply
according to EN 682, and/or EN 549 and shall conform to the appropriate class and type. For applications
in cold geographic areas or for cooling circuits the minimum design temperature is –20 °C (see Table 2)
and the test requirements specified in 9.3.7 shall be considered. For elevated temperatures above 70 °C,
see Table 2, the test temperature in 9.3.7 shall be raised to the maximum operating temperature in the
relevant application.
NOTE For the choice of elastomeric materials, local regulations and requirements can apply.
6 Corrosion protection
6.1 General
In applications where corrosion protection is required, the components shall be adequately protected as
follows.
NOTE For the choice of corrosion protection, local regulations and requirements can apply.
6.2 Hot dip galvanizing
6.2.1 General
Where a protection by zinc coating is required, the zinc coating shall be applied by the hot dip galvanizing
process and shall meet the following requirements.
Additional permanent coatings on top of the hot dip zinc coating do not fall under the category of hot dip
galvanizing in terms of use in the potable water application. The suitability of additional permanent
coatings for potable water applications shall be demonstrated by testing.
6.2.2 Chemical composition of the hot dip zinc coating
The content by mass of the accompanying elements in the finished zinc coating shall not exceed the
following maximum values:
— antimony (Sb) 0,01 %
— arsenic (As) 0,02 %
— bismuth (Bi) 0,01 %
— cadmium (Cd) 0,01 %
— lead (Pb) 0,1 %
NOTE The chemical composition is restricted with regard to the limitation of dangerous substances also in
respect to potable water applications. When fittings are used in potable water applications, local regulations and
requirements can apply.
6.2.3 Coating mass per surface unit and layer thickness
The surface related mass of the zinc coating shall not be less than 500 g/m , which equals to a layer
thickness of 70 μm. These limits refer to the average of 5 fittings with 10 measurements each, statistically
distributed across the fitting. The layer mass/thickness measured on an individual sample shall not be
less than 450 g/m (63 μm).
The medium layer thickness s of the zinc coating in µm shall be calculated by using the approximation
formula:
m
A
s= (1)
72,
where
m is the surface related mass of the zinc coating in g/m
A
6.2.4 Surface conditions of the hot dip zinc coating
The zinc coating on the internal surface of the fitting shall be continuous with the exception of machined
black surfaces. In the special case of larger material cross-sections, the iron-zinc alloy phases may grow
through. The internal zinc coating shall be free from zinc blisters, zinc burrs, non-metallic remainders.
6.3 Non-metallic coating
Depending on the specific application, appropriate non-metallic coatings may be used for both internal
and external corrosion protection, if they are requested by the purchaser.
NOTE If the non-metallic coating is used in potable water applications, local regulations and requirements can
apply.
6.4 Dangerous substances
6.4.1 General
NOTE Regarding the use of fittings produced in accordance with this document and the release of dangerous
substances, local regulations and requirements can apply.
6.4.2 Hot dip zinc coating
The chemical composition of the hot dip zinc coating shall not exceed the limits given in 6.2.2.
6.4.3 Dispatch conditions of finished fittings
The surface of the fitting shall be free of polycyclic aromatic hydrocarbons.
6.4.4 Non-metallic coating
For the choice of non-metallic coating, it is advisable to comply with national regulations with regard to
the presence of dangerous substances.
7 Design
7.1 General
The steel pipes to which the fitting is connectable, shall be defined by the manufacturer, but shall be in
accordance with at least one of the following standards:
— EN 10255;
— EN 10216-1 outside diameters series 1;
— EN 10217-1 outside diameters series 1.
7.2 Geometrical characteristics
Fittings according to this document shall be designed at least for steel pipe diameters and jointing threads
as specified in Table 1.
Table 1 — Pipe diameters, corresponding thread sizes and nominal diameters
Specified outside diameter of pipe Nominal diameter Fittings size
(Size of jointing thread)
mm DN
17,2 10 3/8
21,3 15 1/2
26,9 20 3/4
33,7 25 1
42,4 32 1 1/4
48,3 40 1 1/2
60,3 50 2
76,1 65 2 1/2
Specified outside diameter of pipe Nom
...