oSIST prEN 10242:2022

Threaded pipe fitting in malleable cast iron

This document specifies the requirements for the design and performance of threaded pipe fittings in malleable cast iron with black or hot dip galvanized surface.
These fittings are for general purposes for the transmission of fluids and gases up to the limits of pressure and temperature specified in this document. They are intended for the connection of elements threaded in accordance with EN 10226-1, sizes ⅛ to 6.
Fittings with alternative permanent coatings or permanent coatings on top of hot dip galvanizing do not fall under the scope of this document.
NOTE   One main use is for the connection of non-alloy steel tubes according to EN 10255 and with support of the thread joint by using sealing materials according to EN 751 (all parts).

Gewindefittings aus Temperguss

Dieses Dokument legt die Anforderungen an die Konstruktion und Gebrauchseigenschaften von Gewindefittings in Temperguss mit unverzinkten oder feuerverzinkten Oberflächen fest.
Diese Fittings dienen allgemein der Übertragung von Fluiden und Gasen bis zu den in diesem Dokument festgelegten Druck- und Temperaturgrenzen. Sie sind bestimmt für die Verbindung von Teilen mit Gewinden nach EN 10226 1, Größen ⅛ bis 6.
Fittings mit alternativen dauerhaften Beschichtungen oder dauerhaften Beschichtungen über der Feuerverzinkung fallen nicht in den Anwendungsbereich dieses Dokumentes.
ANMERKUNG   Eine wesentliche Anwendung ist die Verbindung unlegierter Stahlrohre nach EN 10255 und mit Unterstützung des Gewindeanschlusses durch Verwendung von Dichtungswerkstoffen nach EN 751 (alle Teile).

Raccords de tuyauterie filetés en fonte malléable

Le présent document spécifie les exigences de conception et de perfromance des raccords de tuyauterie filetés en fonte malléable avec une surface noire ou galvanisée à chaud.
Ces raccords, d'usage général, servent au transport de fluides et de gaz dans les limites de pression et de température spécifiées dans le présent document. Ils sont prévus pour le raccordement d'éléments filetés conformément à l'EN 10226-1, diamètres ⅛ à 6.
Les raccords présentant des revêtements permanents alternatifs ou des revêtements permanents appliqués sur la galvanisation à chaud ne relèvent pas du domaine d'application du présent document.
NOTE   Une des principales utilisations consiste à raccorder des tubes en acier non allié conformément à l'EN 10255 et avec le support de la jonction filetée en utilisant des matériaux d'étanchéité conformément à l'EN 751 (toutes les parties).

Fitingi z navojem iz temprane litine

General Information

• Status: Not Published
• Public Enquiry End Date: 12-Jul-2022
• ICS: 23.040.40 - Metal fittings
• Technical Committee: IFEK - Ferrous metals
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 28-Apr-2022
• Due Date: 15-Sep-2022
• Completion Date: 13-Jul-2022
• Ref Project: prEN 10242 - Threaded pipe fittings in malleable cast iron

Relations

• Revised: SIST EN 10242:1997 - Threaded pipe fitting in malleable cast iron
• Effective Date: 08-Sep-2021
• Revised: SIST EN 10242:1997 - Threaded pipe fitting in malleable cast iron
• Effective Date: 18-Jan-2023
• Revised: SIST EN 10242:1997 - Threaded pipe fitting in malleable cast iron
• Effective Date: 19-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN 10242:2022
01-junij-2022
Fitingi z navojem iz temprane litine
Threaded pipe fitting in malleable cast iron
Gewindefittings aus Temperguss
Raccords de tuyauterie filetés en fonte malléable
Ta slovenski standard je istoveten z: prEN 10242
ICS:
23.040.40 Kovinski fitingi Metal fittings
oSIST prEN 10242:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 10242:2022

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oSIST prEN 10242:2022


DRAFT
EUROPEAN STANDARD
prEN 10242
NORME EUROPÉENNE

EUROPÄISCHE NORM

April 2022
ICS 23.040.40 Will supersede EN 10242:1994
English Version

Threaded pipe fitting in malleable cast iron
Raccords de tuyauterie filetés en fonte malléable Gewindefittings aus Temperguss
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 459/SC 10.

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 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, Turkey 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

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 10242:2022 E
worldwide for CEN national Members.

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oSIST prEN 10242:2022
prEN 10242:2022 (E)
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Types of fittings . 8
5 Materials .10
5.1 General .10
5.2 Material of the fitting .10
5.2.1 Malleable cast iron .10
5.2.2 Other ferrous materials .10
6 Corrosion protection.11
6.1 General .11
6.2 Hot dip galvanizing .11
6.2.1 General .11
6.2.2 Chemical composition of the hot dip zinc coating .11
6.2.3 Coating mass per surface unit and layer thickness.11
6.2.4 Surface condition of the hot dip zinc coating .12
6.3 Dangerous substances .12
6.3.1 General .12
6.3.2 Hot dip zinc coating .12
6.3.3 Despatch conditions of finished fittings .12
7 Design .12
7.1 General .12
7.2 Design symbol .12
8 Dimensions and tolerances .13
8.1 Relationship between fitting size and nominal size (DN) .13
8.2 Tolerance of the dimensions .13
8.3 Lengths of engagement .14
8.4 Widths across flats .14
8.4.1 General .14
8.4.2 Design of flats .14
8.4.3 Minimum depth of spanner flats .15
8.5 Reaction to fire .15
9 Threads .15
9.1 Choice of thread .15
9.1.1 Jointing thread .15
9.1.2 Fastening threads .15
9.2 Alignment of threads .15
9.3 Chamfering .15
10 Manufacture .15
11 Required characteristics .16
11.1 Permissible working pressure and temperature .16
11.2 Design strength .16
11.3 Assembly .17
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oSIST prEN 10242:2022
prEN 10242:2022 (E)
12 Testing and inspection. 17
12.1 Malleable cast iron . 17
12.2 Hot dip zinc coating. 17
12.3 Threads . 17
12.3.1 Jointing threads . 17
12.3.2 Fastening threads . 17
12.3.3 Alignment . 17
12.4 Leak tightness test . 18
12.5 Final visual inspection . 18
12.6 Acceptance tests for higher performances . 18
12.6.1 General . 18
12.6.2 Hydrostatic pressure tests . 18
12.7 Analysis of polycyclic aromatic hydrocarbons . 18
12.8 Inspection documents . 18
13 Designation of fittings . 18
13.1 Elements of the designation for ordering . 18
13.2 Additional notes on designation of size . 19
13.3 Example of designation . 20
14 Marking . 20
15 Tables with dimensions . 21
Bibliography . 47

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oSIST prEN 10242:2022
prEN 10242:2022 (E)
European foreword
This document (prEN 10242:2022) has been prepared by Technical Committee CEN/TC 459 “ECISS -
1
European Committee for Iron and Steel Standardization” , the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 10242:1994.

1
Through its sub-committee CEN/TC 459/SC 10 “Steel tubes, and iron and steel fittings” (secretariat: UNI).
4

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oSIST prEN 10242:2022
prEN 10242:2022 (E)
1 Scope
This document specifies the requirements for the design and performance of threaded pipe fittings in
malleable cast iron with black or hot dip galvanized surface.
These fittings are for general purposes for the transmission of fluids and gases up to the limits of pressure
and temperature specified in this document. They are intended for the connection of elements threaded
in accordance with EN 10226-1, sizes ⅛ to 6.
Fittings with alternative permanent coatings or permanent coatings on top of hot dip galvanizing do not
fall under the scope of this document.
NOTE One main use is for the connection of non-alloy steel tubes according to EN 10255 and with support of
the thread joint by using sealing materials according to EN 751 (all parts).
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 1562, Founding - Malleable cast irons
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 10216-2, Seamless steel tubes for pressure purposes - Technical delivery conditions - Part 2: Non-alloy
and alloy steel tubes with specified elevated 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 10217-2, Welded steel tubes for pressure purposes - Technical delivery conditions - Part 2: Electric
welded non-alloy and alloy steel tubes with specified elevated 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 10255, Non-Alloy steel tubes suitable for welding and threading - Technical delivery conditions
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 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)
ISO 2859-1, Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by
acceptance quality limit (AQL) for lot-by-lot inspection
5

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oSIST prEN 10242:2022
prEN 10242:2022 (E)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological 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
fitting
connecting piece for pipes and other piping accessories, consisting of one or more parts
3.2
jointing thread
thread complying with EN 10226-1
3.3
fastening thread
thread complying with EN ISO 228-1
3.4
fitting size
nominal size of the connecting (steel) pipe(s)
Note 1 to entry: See also 8.1.
3.5
designation of thread size
size designation of the thread in inch according to EN 10226-1
3.6
nominal size
DN
alphanumeric designation of size for components of a pipework system, which is used for reference
purposes
Note 1 to entry: It comprises the letters DN followed by a dimensionless whole number which is indirectly related
to the physical size, in millimetres, of the bore or outside diameter of the end connections.
Note 2 to entry: Nominal size (DN) should not be used for the designation of fitting size.
Note 3 to entry: The relationship between fitting size and nominal size (DN) is given in Table 3 for information.
[SOURCE: EN ISO 6708:1995, 2.1, modified – formatted parts of the definition as notes to the entry.]
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oSIST prEN 10242:2022
prEN 10242:2022 (E)
3.7
reinforcement
additional material on the outside diameter of an internally threaded fitting in the form of a bead
EXAMPLE

Figure 1 — Reinforcement in form of a bead
3.8
rib
local and axially aligned additional material on the outside or inside of a fitting for assistance in assembly
or manufacturing
3.9
outlet
end of a fitting for the purpose of connection with a pipe or other piping accessories
3.10
run
two principal axially aligned outlets of a tee or cross
3.11
branch
side outlet(s) of a tee or cross
3.12
chamfer
removal of a conical portion at the entrance of a thread to assist assembly and prevent damage to the
start of the thread
3.13
face-to-face dimension
distance between the two parallel faces of axially aligned outlets of a fitting
3.14
face-to-centre dimension
distance between the face of an outlet and the central axis of an angularly disposed outlet
3.15
laying length
average distance from the assembled pipe end to the axis of the fitting, or between the ends of two
assembled pipes
Note 1 to entry: See also 8.3.
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oSIST prEN 10242:2022
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4 Types of fittings
Table 1 gives an index to the fitting types, patterns and symbols. The symbols allow the identification of
fittings and shall be used for designation (see 13.1).
Table 1 — Index of fitting types, symbols and index to tables and patterns
Types Patterns
Symbols A1 A1/45° A4 A4/45°
A
Elbows





Table 9 Table 10 Table 11 Table 9 Table 10 Table 11
Symbols B1
B
Tees



Table 9 Table 12 Table 12 Table 13 Table 13
Symbols C1
C
Crosses

Table 9 Table 14
Symbols D1 D4
D
Short
bends


Table 15 Table 15
Symbols E1 E2
E
Pitcher
tees

Twin


elbows

Table 15 Table 16 Table 16 Table 16 Table 15 Table 17
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oSIST prEN 10242:2022
prEN 10242:2022 (E)
Types Patterns
Symbols G1 G1/45° G4 G4/45° G8
G
Long

sweep


bends

Table 18 Table 19 Table 18 Table 19 Table 18
Symbols M2 M4
M
Sockets


Table 20 Table 20 Table 21 Table 21
Symbols N4 N8
N
Bushings


Hexagon

nipples
Table 22 Table 22 Table 22 Table 23 Table 23
Symbols P4
P
Backnuts

Table 24
Symbols T1 T8 T9 T11
T

Caps

Plugs


Table 25 Table 25 Table 25 Table 25
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oSIST prEN 10242:2022
prEN 10242:2022 (E)
Types Patterns
Symbols U1 U2 U11 U12
U
Union



Table 26 Table 26 Table 26 Table 26
Symbols UA1 UA2 UA11 UA12
UA
Union
elbows


Table 27 Table 27 Table 27 Table 27
Symbols Za1 Za2
Za
Side

outlet

elbows
Table 9 Table 9
and tees
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 apply.
5.2 Material of the fitting
5.2.1 Malleable cast iron
The material used shall be malleable cast iron conforming to EN 1562. The grade of material used shall
be selected from the following grades (see Clause 7):
— grade EN-GJMW-400-5 for fittings in whiteheart malleable cast iron;
— grade EN-GJMB-350-10 for fittings in blackheart malleable cast iron.
5.2.2 Other ferrous materials
Despite this requirement, any other ferrous materials which give mechanical properties at least
equivalent to those malleable cast irons specified in EN 1562, shall be considered in compliance with this
standard for straight fittings not larger than ⅜, but excluding unions.
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oSIST prEN 10242:2022
prEN 10242:2022 (E)
6 Corrosion protection
6.1 General
In applications where materials are susceptible to corrosion, the components shall be adequately
protected as specified in 6.2.
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.
Fittings with alternative permanent coatings or permanent coatings on top of hot dip galvanizing don't
fall under the scope of this document.
For fittings supplied in other ferrous materials (such as carbon steel, see 5.2.2) an alternative zinc coating
may be provided by agreement with the purchaser.
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 drinking water applications. When fittings are used in potable water applications relevant national
hygienic regulations apply.
6.2.3 Coating mass per surface unit and layer thickness
2
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
2
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=
72,
where
2
is the surface related mass of the zinc coating in g/m .
mA
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oSIST prEN 10242:2022
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6.2.4 Surface condition 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 Dangerous substances
6.3.1 General
For the use of fittings produced in accordance with this document, it is advisable to comply with national
regulations regarding the release of dangerous substances.
6.3.2 Hot dip zinc coating
The chemical composition of the hot dip zinc coating shall not exceed the limits given in 6.2.1.
6.3.3 Despatch conditions of finished fittings
The surfaces of the fittings shall be free of polycyclic aromatic hydrocarbons.
7 Design
7.1 General
The fittings are combatible with tubes according to EN 10255, EN 10216-1, EN 10216-2, EN 10217-1 and
EN 10217-2.
The user shall consider the minimum wall thickness required for thread cutting when following the
requirements in EN 10255.
7.2 Design symbol
Fittings shall be identified by the design symbol according to the selected material (see 5.2.1) and the
choice of thread (see 9.1.1) as given in Table 2.
Table 2 — Design symbol
Design symbol Thread type Material grade
external internal
EN-GJMW-400–5 or
A R Rp
EN-GJMB-350–10
The drawings in Table 9 to Table 27 are schematic, without prejudice to the manufactured form.
Dimensionally standardized types and sizes are shown in Table 9 to Table 27.
Fittings shall be reinforced at the internally threaded ends by a bead, except where they are polygonal in
shape to allow for spanner flats, or where fittings have side outlets (type Za1 and Za2). Fittings with
internal threads according to EN 10226-1 (Rp) should have a bead as reinforcement.
Manufacturers may incorporate ribs at their discretion. Ribs shall not project higher than the bead.
Backnuts may be plain or recessed and one face may be machined.
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oSIST prEN 10242:2022
prEN 10242:2022 (E)
Table 26 and Table 27 show two typical types of seats of unions and their designation. Other types of seat
design and seat material shall be considered as complying with this standard provided the dimensions in
Table 26 and Table 27 and the requirements of this standard can be demonstrated. Such unions do not
have a specific designation according to this standard.
8 Dimensions and tolerances
8.1 Relationship between fitting size and nominal size (DN)
The relationship between designation of thread size, which is the fitting size, and nominal size (DN) in
given in Table 3 for guidance only.
Table 3 — Thread designation and nominal size
Designation of
thread ⅛ ¼ ⅜ ½ ¾ 1 1¼ 1½ 2 2½ 3 4 5 6
size/fitting size
Nominal size, DN 6 8 10 15 20 25 32 40 50 65 80 100 125 150
8.2 Tolerance of the dimensions
Fittings shall have the appropriate dimensions given in Table 9 to Table 27. Where maximum or
minimum dimensions are not specified, the tolerances for the face-to-face and face-to-centre dimensions
shall be as given in Table 4.
NOTE 1 Fitting sizes shown in brackets are optional sizes.
NOTE 2 The face-to-face and face-to-centre dimensions of unions can exceed the tolerance given due to the
compound effect of piece tolerances upon the final assembly.
Table 4 — Tolerance on length
Dimensions in millimetres
a
Fitting measurement Tolerance
≤ 30 ±1,5
> 30 ≤ 50 ±2,0
> 50 ≤ 75 ±2,5
> 75 ≤ 100 ±3,0
> 100 ≤ 150 ±3,5
> 150 ≤ 200 ±4,0
> 200 ±5,0
a
Measurements according to Table 9 to Table 27.
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8.3 Lengths of engagement
Laying lengths are given for assistance and guidance during installation. Their accuracy is dependent
upon the tolerances given in 8.2 and on the tolerance of the threads specified in EN 10226-1. The
dimensions z given in Table 8 to Table 26 are the average distance from the pipe end to the axis of the
fitting (see Figure 2) or the distance from pipe end to pipe end (see Figure 3).
These laying lengths are calculated by deducting average lengths of engagement from the fact-to-face or
face-to-centre dimensions given in the tables. The average lengths of engagement are rounded from the
dimensions given in EN 10226-1 and are given in Table 5.
Table 5 — Lengths of engagement
Designation of
⅛ ¼ ⅜ ½ ¾ 1 1¼ 1½ 2 2½ 3 4 5 6
thread size
Length of
engagement, 7 10 10 13 15 17 19 19 24 27 30 36 40 40
mm



Figure 2 — Laying lengths z in the case of an Figure 3 — Laying length z in the case of
angularly disposed fitting an axially aligned fitting

8.4 Widths across flats
8.4.1 General
The dimensions of widths across flats depend on the design of the fittings and are at the discretion of the
manufacturer.
8.4.2 Design of flats
External flats on plugs shall be square. Flats on other fittings up to and including size ¾ should be
hexagonal. Flats on other fittings above size ¾ may be hexagonal or octagonal. Flats on union parts,
excluding the union nut, may be hexagonal, octagonal or decagonal.
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oSIST prEN 10242:2022
prEN 10242:2022 (E)
8.4.3 Minimum depth of spanner flats
The minimum depth of the flats measured at the corners shall be as given in Table 6. For backnuts any
chamfering shall not reduce the depth of flat below the minimum dimension given in Table 6.
Table 6 — Minimum depth of spanner flats
Designation of
⅛ ¼ ⅜ ½ ¾ 1 1¼ 1½ 2 2½ 3 4 5 6
thread size
Min. depth of
4 4 5 5 5,5 6 6,5 6,5 7 7 7,5 8 8 8
spanner flats, mm
8.5 Reaction to fire
Malleable cast iron is class A1 in accordance with the Commission Decision 96/603/EEC of
4 October 1996 amended by the Council Decision of 28 September 2000 and therefore does not require
to be tested for reaction to fire.
9 Threads
9.1 Choice of thread
9.1.1 Jointing thread
Fittings shall be threaded in accordance with EN 10226-1. External threads shall be taper (R), internal
threads shall be parallel (Rp).
9.1.2 Fastening threads
The threads of backnuts, union nuts and their mating threads shall be in acco
...