prEN 10344

SLOVENSKI oSIST prEN 10344:2006

PREDSTANDARD
september 2006
Fitingi iz temprane železove litine s prižemnimi priključki za železne cevi
Malleable cast iron fittings with compression ends for steel pipes
ICS 23.040.40 Referenčna številka
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

EUROPEAN STANDARD
DRAFT
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2006
ICS
English Version
Malleable cast iron fittings with compression ends for steel pipes
Raccords à compression en fonte malléable pour tubes Tempergussfittings mit Klemmanschlüssen für Stahlrohre
d'acier
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ECISS/TC 29.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,
Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 10344:2006: E
worldwide for CEN national Members.

Contents Page
Foreword.4
1 Scope .5
2 Normative references .5
3 Terms and definitions .6
4 Types of fittings .8
5 Materials .8
5.1 Material of the fitting .8
5.1.1 Malleable cast iron.8
5.1.2 Other ferrous materials .9
5.2 Elastomers.9
6 Corrosion protection .9
6.1 General.9
6.2 Hot dip galvanizing.9
6.2.1 Chemical composition of the hot dip galvanized coating .9
6.2.2 Coating mass per surface unit .10
6.2.3 Surface conditions of the zinc coating.10
6.3 Non-metallic coating .10
6.4 Dispatch conditions of finished fittings .10
7 Design .11
7.1 General.11
7.2 Geometrical characteristics.11
7.3 Minimum bore .12
7.4 Pipe threads .12
7.5 Sealing surfaces .12
7.6 Transition fittings.13
7.6.1 Transition with jointing thread .13
7.6.2 Transition for polyethylene pipe .13
7.6.3 Transition for other pipes .13
7.7 Load transmission.13
8 Performance requirements .13
8.1 Crushing strength.13
8.2 Internal pressure strength .13
8.3 Pressure and temperature limits.13
8.4 Maximum load for deformation .14
8.5 Dimensional tolerances .14
8.6 Leaktightness.14
8.7 Reaction to fire.14
8.8 Durability .14
8.8.1 Durability fittings .14
8.8.2 Durability of elastomeric sealing joints.14
9 Test requirements and methods .14
9.1 Material tests.16
9.1.1 Testing of malleable cast iron .16
9.1.2 Testing of plastic components.16
9.1.3 Testing of sealing materials .16
9.1.4 Hot dip zinc galvanization.16
9.1.5 Analysis of polycyclic aromatic hydrocarbons .16
9.2 Component tests .16
9.2.1 Visual inspection .16
9.2.2 Geometrical characteristics .16
9.2.3 Verification of threads.17
9.2.4 Leaktightness of fitting body .17
9.3 Assembly tests .17
9.3.1 Leaktightness under internal pressure .17
9.3.2 Leaktightness under vacuum.17
9.3.3 Leaktightness under pressure cycling.18
9.3.4 Leaktightness under temperature cycling .18
9.3.5 Leaktightness after repeated movements.20
9.3.6 Resistance to pull-out .21
9.3.7 Resistance to vibrations .21
9.3.8 Leaktightness after temperature changes .22
9.3.9 Leaktightness at low temperature after temperature changes.22
10 Evaluation of conformity.23
10.1 General.23
10.2 Type testing.23
10.3 Factory production control by the manufacturer.23
11 Assessment of conformity.23
12 Designation of fittings.24
12.1 Elements of the designation.24
12.2 Additional notes on designation of size.24
12.3 Examples of designation .24
13 Marking .25
Annex A (informative) Quality management system .26
Annex ZA (informative) Clauses of this European Standard addressing the provisions of EU
Construction Products Directive .27
ZA.1 General.27
ZA.2 Procedure for attestation of conformity.28
ZA.2.1 System of attestation of conformity .28
ZA.2.2 EC Declaration of conformity .29
ZA.3 CE marking and labelling.29
Bibliography.31

Foreword
This document (prEN 10344:2006) has been prepared by Technical Committee ECISS/TC 29 “Steel tubes and
fittings for steel tubes”, the secretariat of which is held by UNI.
This document is currently submitted to the CEN Enquiry.
This document has been prepared under a mandate given to CEN by the European Commission and the European
Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see informative Annex ZA, B, C or D, which is an integral part of this document.
This standard includes the following annexes :
Annex A (informative) : Quality management system.
Annex ZA (informative) : Clauses of this European Standard addressing the provisions of the EU Construction
Products Directive.
1 Scope
This standard specifies the requirements for the design, performance and testing of malleable cast iron fittings with
compression ends for steel pipes. It applies to steel piping systems for different application fields, such as gas supply,
distribution of water for general purposes and for human consumption, irrigation, fire fighting, aqueous liquids,
compressed air and gaseous fuel systems.
It also applies to oil piping systems, provided the elastomeric sealing material is compatible with the oil and the
operating conditions.
It contains requirements and tests relating to compression fittings which can be disconnected from smooth walled
steel pipes or other cylindrical metal structural elements, which are applicable for dismantleable joints. The fittings
can also incorporate other types of connection, such as threaded, flanged, compression ends for connection of
polyethylene pipes, etc., and can also take on various structural shapes, such as, straight piece, elbow or T-piece,
etc. Their range of sizes covers nominal sizes DN 6 to DN 100 (size 1/8 to 4).
2 Normative references
The following referenced documents are indispensable for the application 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 – Material requirements for pipe joint seals used in water and drainage applications –
Part 1 : Vulcanized rubber.
EN 682, Elastomeric seals – Material requirements for joint seals used in pipes and fittings carrying gas and
hydrocarbon fluids.
EN 751-1, Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water –
Part 1 : Anaerobic jointing compounds.
EN 751-2, Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water –
Part 2 : Non-hardening jointing compounds.
EN 751-3, Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water –
Part 3 : Unsintered PTFE tapes.
EN 1562, Founding – Malleable cast irons.
EN 10204, Metallic products – Types of inspection documents.
EN 10208-1, Steel pipes for pipelines for combustible fluids – Technical delivery conditions – Part 1 : Pipes of
requirement class A.
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 : 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 10226-2, Pipe threads where pressure-tight joints are made on the threads – Part 2 : Taper external threads and
taper internal threads – Dimensions, tolerances and designation.
EN 10226-3, Pipe threads where pressure-tight joints 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 piping systems.
EN 10305-1, Precision steel tubes – Part 1 : Seamless cold drawn tubes.
EN 10305-2, Precision steel tubes – Part 3 : Welded cold drawn tubes.
EN 10305-3, Precision steel tubes – Part 2 : Welded cold sized tubes.
EN 12294, Plastic piping systems – Systems for hot and cold water – Test method for leaktightness under vacuum.
EN 12295, Plastics piping systems – Thermoplastics pipes and associated fittings for hot and cold water – Test
method for resistance of joints to pressure cycling.
EN 13501-1, Fire classification of construction products and building elements – Part 1 : Classification using test
data from reaction to fire tests.
EN ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads – Part 1 : Designation,
dimensions and tolerances.
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 1460, Metallic coatings – Hot dip galvanized coatings on ferrous materials – Gravimetric determination of the
mass per unit area.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
generals
3.1.1
fitting
connecting piece for pipes
3.1.2
transition fitting
a fitting jointing different types of pipe and/or comprising different types of outlet
3.1.3
end-load bearing joint
a joint which can resist axial loads without additional external mechanical support
3.1.4
non-load bearing joint
a joint which cannot resist axial loads without additional external mechanical support
3.1.5
fitting size
the nominal size of the connecting steel pipe
NOTE For transition fittings the designation follows the type of the outlet.
3.1.6
fitting body
the main pressure-bearing part a fitting
3.1.7
outlet
end of a fitting which connects with a pipe
3.1.8
run
two principal axially aligned outlets of a tee
3.1.9
branch
side outlet of a tee.
3.1.10
compression end
an end of a fitting in which the joint is made by the compression of components onto the smooth wall pipe to provide
pressure integrity and leaktightness
3.1.11
grip ring
ring that holds the pipes in place and prevents pull out from the joint
3.1.12
minimum bore
smallest internal diameter measured at any cross-section of the assembled fitting
3.1.13
smooth walls
smooth pipe surfaces in the seal and clamping area which are unshaped, undamaged and untreated
NOTE Cleaning and deburring is not regarded as treatment.
3.1.14
dismountibility
ability 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 compression rings
3.1.15
jointing thread
thread complying with EN 10226-1
3.1.16
fastening thread
thread complying with EN ISO 228-1
3.1.17
component test
test to verify the performance of a fitting carried out on the fitting with or without the internal parts
3.1.18
assembly test
test to verify the fitness for purpose of an assembled fitting with the connecting pipes
3.2
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 2 full deflections by ± α in relation to the starting position (α according to manufacturer's
specifications)
3.2.2
axial movability
axial path within which the fitting remains leak-tight following 2 full path changes by ± a in relation to the starting
position (a = according to manufacturer's specifications)
3.2.3
torsional angle
the maximum angle β within the piece can twist around its axis, when the assembly still remains leak-tight following 2
full twists by ± β in relation to the starting position (β is according to manufacturer's specifications)
3.3
resistance to pull-out
the ability of the joint to withstand axial mechanical forces or applied through internal pressure, while remaining leak-
tight
3.4
pressure and temperature
3.4.1
allowable operating pressure (PFA
the maximum operating pressure of the connected pipe joint(s) in continuous function
3.4.2
allowable operating temperature (TFA)
the maximum operating temperature of the connected pipe joint(s) in continuous function
4 Types of fittings
All types of fittings subject to this standard, provide dismountable joints
5 Materials
5.1 Material of the fitting
5.1.1 Malleable cast iron
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 or EN-GJMB-350-10 for fittings in white heart malleable iron ;
 grade EN-GJMW-350-4 or EN-GJMB-300-6 for fittings in black heart malleable iron.
Fittings shall be identified by material symbols according to the selected material mentioned above and as given in
Table 1.
Table 1 — Material symbols
Material symbol Material grade
EN-GJMW-400-5 or
A
EN-GJMB-350-10
EN-GJMW-350-4 or
B
EN-GJMB-300-6
5.1.2 Other ferrous materials
Notwithstanding this requirement, any other ferrous materials which give mechanical properties at least equivalent to
those malleable cast irons specified above will be allowed.
5.2 Elastomers
The material of elastomeric sealing rings used in fittings shall be chosen for drinking water application from EN 681-
1 and for gas supply EN 682, respectively EN 549, depending on the specific application and shall conform to the
appropriate class respectively type. For applications in cold geographic areas the minimum design temperature is –
20 °C (see Table 3) and the test requirements specified in 9.3.5 and 9.3.6 are to be considered.
6 Corrosion protection
6.1 General
In applications where materials are susceptible to corrosion, the components shall be adequately protected.
6.2 Hot dip galvanizing
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.
NOTE For fittings supplied in other ferrous materials (see 5.1.2) alternative zinc coating may be provided by agreement with
the purchaser.
6.2.1 Chemical composition of the hot dip galvanized 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) 1,6 % in individual cases 1,8 %.
For drinking water applications the lead content shall be less than stated above, in order not to exceed the limit
specified in the Drinking Water Directive 98/83/EC.
6.2.2 Coating mass per surface unit
The areic mass of the zinc coating shall be not less than 500 g/m , as an average of 5 fittings. This corresponds to a
medium layer thickness of 70 µm.
It shall be not less than 450 g/m (63 µm) when it is measured on an individual sample.
The medium layer thickness s of the zinc coating in µm may be calculated by using the approximation formula :
m
A
s=
7.2
where
m is the surface related mass of the zinc coating in g/m .
A
6.2.3 Surface conditions of the 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 external and internal conditions of use, also non-metallic coatings may be used, for example plastic
coatings, if they are accepted by the purchaser.
6.4 Dispatch conditions of finished fittings
The surface of the fitting shall be free of polycyclic aromatic hydrocarbons.
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 minimum one of the following standards.
 EN 10255 ;
 EN 10208-1 ;
 EN 10216-1 outside diameters series 1 ;
 EN 10217-1 outside diameters series 1 ;
 EN 10305-1 ;
 EN 10305-2 ;
 EN 10305-3.
If special mechanical assembly tools are required, they shall be made available and they shall have sufficiently large
bearing surfaces to avoid causing visible deformation during assembly.
7.2 Geometrical characteristics
Fittings according to this standard shall be designed for steel pipe diameters and jointing threads as specified in
Table 2
Table 2 — Pipe diameters, corresponding thread sizes and nominal diameters
Specified outside Nominal Diameter Size of jointing thread
diameter of pipe
mm DN
10,2 6 1/8
13,5 8 1/4
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
88,9 80 3
114,3 100 4
The dimensions and tolerances of the fitting and its possible components shall be designed for the connecting pipe in
such a way that the joint remains permanently tight when stresses arise under service load.
7.3 Minimum bore
The minimum bore is given by the manufacturer.
7.4 Pipe threads
Jointing threads on transition fittings shall be in accordance EN 10226-1 or EN 10226-2.
Fastening threads of outlets shall be in accordance with EN ISO 228-1.
NOTE Mating threads on pre-assembled components are left to the discretion of the manufacturers.
7.5 Sealing surfaces
The sealing surfaces shall be free of all scratches, blisters or cracks that might affect the leaktightness of the
assembled joint.
Those contact surfaces that are rendered tight by means of an elastomeric seal shall be smooth.
No component of the fitting shall show any signs of damage, scratches, pitting, bubbles, blisters, inclusions or cracks
to an extent that would prevent compliance with this standard. They shall not be impregnated to cover such defects.
7.6 Transition fittings
7.6.1 Transition with jointing thread
Jointing threads on transition fittings shall be in accordance with EN 10226-1 or EN 10226-2.
7.6.2 Transition for polyethylene pipe
Compression ends for the connection of polyethylene pipes shall be in conformance with EN 10284.
7.6.3 Transition for other pipes
Compression ends for the connection of pipes in other materials shall be in conformance with the relevant standard.
7.7 Load transmission
Compression ends fittings need to be end-load-bearing, however they can be also of non-end-load-bearing type for
certain applications. In this case they need additional mechanical fixations to transmit axial forces.
8 Performance requirements
8.1 Crushing strength
The crushing strength of the fittings is deemed to be satisfied if the malleable iron of the fitting body fulfil the test
requirements of 9.1.1.
8.2 Internal pressure strength
The internal pressure strength of the fittings shall be declared by the manufacturer as allowable operating pressure
PFA in bar following 8.3. The fittings shall be designed for the declared PFA and tested according to 9.3.
8.3 Pressure and temperature limits
The fittings shall be designed for the pressure and temperature limits in continuous service as specified in Table 3
and shall be tight under these operating conditions when they are joint to pipes.
Table 3 — Performance requirements
Application field Gas Pressurised Aqueous
Air liquids
Allowable operating
pressure PFA
5, 10 or 16 6 or 10 6, 10 or 16
bar
Allowable operating
temperature TFA
- 5* - 70 - 5* - 70 5 - 80
Min./max. °C
* -20 °C for application in
...