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Summary of pages
This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 16, an inside back cover and a back cover.
Amendments issued since publication
no record
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English version
Hose fittings with clamp units
Part 3: Clamp units, bolted or pinned
Raccords pour flexibles avec demi-coquille - Partie 3: Colliers boulonnés ou goupillés
Schlaucharmaturen mit Klemmfassungen - Teil 3: Klemmfassungen, verschraubt oder verstiftet
This European Standard was approved by CEN on 30 September 2004.
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 Central Secretariat 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 Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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.
©BSI 3 October 2005 / ISBN 0 580 46624 8 / Ref. No. EN 14420-3:2004: E / November 2004 / ICS 23.040.70
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Contents
Foreword
1 Scope
2 Normative references
3 Fixing range of clamp units
4 Types of clamp units and designations
4.1 General
4.2 Clamp unit K, bolted
4.3 Clamp unit S, pinned
5 Dimensions and weights
5.1 Clamp units
5.1.1 Dimensions
5.2 Weights
5.3 Nuts, bolts and pins
6 Materials
6.1 General
6.2 Clamp shells
6.3 Bolts and nuts
6.4 Pins
7 Marking
8 Type approval testing and quality control
Bibliography
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Foreword
This document (EN 14420—3:2004) has been prepared by Technical Committee CEN/TC 218 “Rubber and plastics hoses and hose assemblies”, the secretariat of which is held by BSI.
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 May 2005, and conflicting national standards shall be withdrawn at the latest by May 2005.
EN 14420 consists at the time of publication of the following parts:
EN 14420-1, Hose fittings with clamp units — Part 1: Requirements, survey, designation and testing
EN 14420-2, Hose fittings with clamp units — Part 2: Hose side parts of hose tail
EN 14420-3, Hose fittings with clamp units — Part 3: Clamp units, bolted or pinned
EN 14420-4, Hose fittings with clamp units — Part 4: Flange connections
EN 14420-5, Hose fittings with clamp units — Part 5: Threaded connections
EN 14420-6, Hose fittings with clamp units — Part 6: TW tank truck couplings
EN 14420-7, Hose fittings with clamp units — Part 7: Cam locking couplings
EN 14420-8, Hose fittings with clamp units — Part 8: Symmetrical half coupling (Guillemin system)
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard : Austria, Belgium, Bulgaria, 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.
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1 Scope
This document specifies requirements for clamp units for hose couplings according to EN 14420-1 for use with hose tails according to EN 14420-2.
Maximum working pressure 25 bar, maximum working temperature 65 °C.
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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 586-2, Aluminium and aluminium alloys — Forgings — Part 2: Mechanical properties and additional property requirements.
EN 1706, Aluminium and aluminium alloys — Castings — Chemical composition and mechanical properties.
EN 10088-1, Stainless steels — Part 1: List of stainless steels.
EN 10213-4, Technical delivery conditions for steel castings for pressure purposes — Part 4: Austenitic and austenitic-ferritic steel grades.
EN 12420, Copper and copper alloys — Forgings.
EN 14420-1, Hose fittings with clamp units — Part 1: Requirements, survey, designation and testing.
EN 14420-2, Hose fittings with clamp units — Part 2: Hose side parts of hose tail.
EN 20898-2, Mechanical properties of fasteners — Part 2: Nuts with specified proof load values — Coarse thread (ISO 898-2:1992).
EN ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 1: Bolts, screws and studs (ISO 898-1:1999).
EN ISO 3506-1, Mechanical properties of corrosion-resistant stainless-steel fasteners — Part 1: Bolts, screws and studs (ISO 3506-1:1997).
EN ISO 3506-2, Mechanical properties of corrosion-resistant stainless-steel fasteners — Part 2: Nuts (ISO 3506-2:1997).
EN ISO 4032, Hexagon nuts, style 1 — Product grades A and B (ISO 4032:1999).
EN ISO 4042, Fasteners — Electroplated coatings (ISO 4042:1999).
EN ISO 4762, Hexagon socket head cap screws (ISO 4762:2004).
EN 22768-1, General tolerances — Part 1: Tolerances for linear and angular dimensions without individual tolerance indications (ISO 2768-1:1989)
EN 22768-2, General tolerances — Part 2: Geometrical tolerances for features without individual tolerance indications (ISO 2768-2:1989)
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3 Fixing range of clamp units
The pinching range of the clamp units shall be according to Table 1.
NOTE The same clamp units are used for DN and inch designated hoses. Care should be taken at the upper limit of the fixing range.
Table 1 — Pinching range of clamp units
| Nominal size |
Hose inside diameter |
Hose outside diameter range with shank insertedª (fixing range) |
| DN |
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Tolerance |
Clamp unit K, bolted |
Clamp unit S, pinned |
| 15 |
13 |
± 0,5 |
22 to 24 |
— |
| 20 |
19 |
± 0,5 |
22 to 24 |
— |
| 25 |
25 |
± 0,5 |
36 to 39 |
36 to 38 |
| 32 |
32 |
± 0,5 |
43 to 46 |
43 to 45 |
| 40 |
38 |
± 0,5 |
50 to 53 |
50 to 52 |
| 50 |
50 |
± 0,7 |
63 to 67 |
63 to 67 |
| 65 |
63 |
± 0,8 |
78 to 82 |
78 to 81 |
| 80 |
75 |
± 0,8 |
89 to 93 |
89 to 92 |
| 100 |
100 |
± 0,8 |
114 to 119 |
115 to 118 |
| 150 |
150 |
+ 1,5 / - 0,8 |
167 to 173 |
— |
| 200 |
200 |
+ 2 / - 0,8 |
222 to 229 |
— |
| ª Hose shank shall be according to EN 14420-2. |
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6 Materials
6.1 General
Whatever the kind of manufacturing procedure is, the minimum mechanical characteristics shall be equivalent to the mechanical characteristics of forgings (in case of aluminium and brass), investment casting (in case of stainless steel) using the materials specified in this document.
6.2 Clamp shells
Clamp shells shall be made of the following materials:
— stainless steels
X5CrNiMo17-12-2 material number 1.4401 according to EN 10088-1
X2CrNiMo17-12-2 material number 1.4404 according to EN 10088-1
GX5CrNiMo19-11-2 material number 1.4408 according to EN 10213-4
GX5CrNiMoNb19-11-12 material number 1.4581 according to EN 10213-4
— Aluminium alloys
EN AC Si7Mg0,3 material number EN AC-42100 according to EN 1706
EN AC Si7Mg0,6 material number EN AC-42200 according to EN 1706
Parts made by turning:
CuZn39Pb3 material number CW614N according to EN 12164
CuZn40Pb2 material number CW617N according to EN 12164
These grades shall be heat treated according to manufacturer’s specification.
EN AW-AlSi1MgMn material number EN AW-6082 according to EN 586-2
— copper-zinc-alloy
Parts forged from extruded materials:
CuZn39Pb3-H080 material number CW 614 N according to EN 12420
CuZn40Pb2-H080 material number CW 617 N according to EN 12420
6.3 Bolts and nuts
For clamp shells K made of aluminium alloys or copper-zinc-alloy, bolts and nuts shall be made from unalloyed steel.
Table 8 — Tensile strength class for bolts and nuts
| Nominal size |
Tensile strength class according to |
| DN |
EN ISO 898-1
Bolts |
EN 20898-2
Nuts |
| 15 to 40 |
10.9 |
10 |
| 50 to 150 |
8.8 |
8 |
| 200 |
10.9 |
10 |
Bolts and nuts shall have electroplated coating A2C or A3C according to EN ISO 4042.
For clamp unit K made of stainless steel:
Bolts shall be of steel group A4 with tensile strength class 70 and nuts shall be of steel group A4 with tensile strength class 50 according to EN ISO 3506-1 and EN ISO 3506-2.
6.4 Pins
Pins shall be made of the following materials:
— At clamp unit S:
X4CrNi18-12 material number 1.4303 according to EN 10088-1
X10CrNi18-8 material number 1.4310 according to EN 10088-1
Minimum tensile strength 600 N/mm2 for each material.
Other stainless steels meeting the same performance requirements are permitted.
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7 Marking
The clamp units shall be marked legibly and permanently on the clamp shells as a minimum with the following information:
outside
— EN 14420-3;
— manufacturers name or trademark;
— material number;
inside
— nominal size (DN);
— hose inside diameter and range of hose outside diameter (e.g. 50/63-67) or hose inside diameter and hose wall thickness or range of hose wall thickness respectively (e.g. 50 × 8 or 50 × 7-9 respectively).
NOTE Marking which deviates from this specification is permissible for a transition period of 3 years after publication of this document.
For clamp units with mounted hinge pin it is permitted to do the marking either on one clamp shell only or to split the marking on both shells. |
8 Type approval testing and quality control
Shall be accordingly to EN 14420-1. |
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Bibliography
[1] EN ISO 8330, Rubber and plastics hoses and hose assemblies – Vocabulary (ISO 8330:1998)
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