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Amendments issued since publication
Amd. No.: 17153 / Date: 29 June 2007 / Comments: Implementation of CEN amendment A1:2007
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English version
Hose fittings with clamp units
Part 6: TW tank truck couplings
Raccords pour flexibles avec demi-coquille - Partie 6: Raccords TW pour camion-citerne
Schlaucharmaturen mit Klemmfassungen - Teil 6: TW Tankwagen-Kupplungen
This European Standard was approved by CEN on 30 September 2004 and includes Amendment 1 approved by CEN on 13 December 2006.
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 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 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 2007 / ISBN 0 580 46627 2 / Ref. No. EN 14420-6:2004+A1:2007 E / January 2007 / ICS 23.040.70 / Supersedes EN 14420-6:2004
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Contents
Foreword
1 Scope
2 Normative references
3 Survey
4 Dimensions, designations
4.1 Hose fittings with TW couplings
4.1.1 General
4.1.2 Hose tail with female TW coupling
4.1.3 Hose tail with male TW coupling
4.1.4 Protecting ring
4.2 Male coupling (type VK)
4.2.1 General
4.2.2 Components
4.3 Female coupling (type MK)
4.3.1 Female coupling (type MK) DN 50 and DN 80
4.3.2 Female coupling (type MK) DN 100
4.3.3 Designation
4.3.4 Components
4.4 Dust cap (type MB)
4.4.1 General
4.4.2 Components
4.5 Dust plug (type VB)
4.5.1 General
4.5.2 Components
5 Materials
5.1 General
5.2 Hose tail types MKST and VKST
5.3 Protecting rings of hose tail type MKST and VKST
5.4 Thread sealing ring of male coupling type VK
5.5 Fastening component of female coupling type MK
5.6 Sealing ring of female coupling type MK
6 Design
7 Type approval testing and quality control
7.1 General
7.2 Testing for trueness to gauge size
8 Marking
9 Fitting of hose couplings
Annex A (normative) Gauges for TW tank truck couplings
A.1 General
A.2 Design; designation, dimensions and materials
A.2.1 General
A.2.2 Gauge for sealing ring
A.2.3 Gauge for tension rings
A.2.4 Gauge for curved pieces and plugs
A.2.5 Calliper for caps
A.3 Marking
Bibliography
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Foreword
This document (EN 14420-6:2004+A1:2007) 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 July 2007, and conflicting national standards shall be withdrawn at the latest by July 2007.
This document includes Amendment 1, approved by CEN on 2006-12-13.
The start and finish of text introduced or altered by amendment is indicated in the text by tags.
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 couplings (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 the design, materials and dimensions for hose fittings with couplings for tank trucks (TW couplings).
Couplings for tank trucks in accordance to this document are intended to link hoses with connections for the transport of liquids, solid matters and gases with the exception of liquid gas and steam. They can be employed in a working pressure range of − 0,8 bar up to 16 bar at working temperatures of − 20 °C up to + 65 °C. Couplings for tank trucks for other operating conditions are subject to agreement.
WARNING Male and female dust couplings are pressure resistant plugs. They do not work as locking device, so, if pipelines remain under pressure, a locking device shall be superposed.
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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 10083-2, Quenched and tempered steels — Part 2: Technical delivery conditions for unalloyed quality steels
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 alloy — 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 14420-3, Hose fittings with clamp units — Part 3: Clamp units, bolted or pinned
EN 14420-5, Hose fittings with clamp units — Part 5: Threaded connections
EN 22768-1, General tolerances — Part 1: Tolerances for linear and angular dimensions without individual tolerance indications (ISO 2768:1989)
EN 22768-2, General tolerances — Part 2: Geometrical tolerances for features without individual tolerance indication (ISO 2768:1989)
EN ISO 4042, Fasteners — Electroplated coatings (ISO 4042:1999)
ISO 48, Rubber, vulcanized or thermoplastic — Determination of hardness (Hardness between 10 IRHD and 100 IRHD)
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3 Survey
Hose fittings with TW coupling: Female coupling (Type MKS) and male coupling (Type VKS).
Usual fitting combination for the filling of the storage tank: Female coupling (Type MK) and male coupling (Type VK).
Usual fitting combination for closing off the outlet end of the TW: Female coupling (Type MK) and male dust coupling (Type VB).
Usual fitting combination for closing off the filling nozzle or the storage tank: Female dust coupling (Type MB) and male coupling (Type VK).
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5 Materials
5.1 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.
5.2 Hose tail types MKST and VKST
These materials are also applicable for the body of male coupling type VK, for the seal fixture, tension ring and lever of female coupling type MK, the female dust coupling type MB and male dust coupling type VB.
Hose tail types MKST and VKST shall be made of the following materials:
— Copper-zinc alloys 1)
Parts forged from extruded materials:
CuZn39Pb3-H080 material number CW614N according to EN 12420
CuZn40Pb2-H080 material number CW617N according to EN 12420
— Wrought aluminium alloys 1)
EN AW-AL Si1MgMn material number EN AW-6082 according to EN 586-2
— Stainless steels 1)
X5CrNi18-10 material number 1.4301 according to EN 10088-1
X5CrNiMo17-12-2 material number 1.4401 according to EN 10088-1
X2CrNiMo17-12-2 material number 1.4404 according to EN 10088-1
X6CrNiTi18-10 material number 1.4541 according to EN 10088-1
X6CrNiMoTi17-12-2 material number 1.4571 according to EN 10088-1
GX5CrNiMo19-11-2 material number 1.4408 according to EN 10213-4
GX5CrNiMoNb19-11-2 material number 1.4581 according to EN 10213-4
5.3 Protecting rings of hose tail type MKST and VKST
Plastics, resistant to abrasion and insensitive to fracture, e.g. polyamide (PA).
5.4 Thread sealing ring of male coupling type VK
Cross-linked polyurethane (PU) or another suitable, equivalent material which is resistant to abrasion, fuel and oil.
For the transport of different fluids a suitable material shall be agreed by manufacturer and purchaser.
Hardness: shall be IRHD 90 ± 5 according to ISO 48
5.5 Fastening component of female coupling type MK
Steel, shall be rust protected B 3 C according to EN ISO 4042 or non rusting material, with minimum tensile of strength 360 N/mm2, at the discretion of the manufacturer.
5.6 Sealing ring of female coupling type MK
Rubber/plastics (E), resistant to abrasion, fuel and oil.
Hardness: shall be IRHD 70 ± 5 according to ISO 48
For the transport of different fluids a suitable material shall be agreed by manufacturer and purchaser. When using profiled sealing rings, the exchangeability of sealing rings and the procedure of coupling shall not be affected adversely by deformation of the sealing rings. Hardness for profiled sealing rings can also be IRHD 80 ± 5.
Use non-asbestos materials for gaskets.
1) Other suitable materials may be agreed. If nothing else is agreed in the order, the choice of the above mentioned materials is at the option of the manufacturer.
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6 Design
MB type female dust couplings or VB type male dust couplings shall only be used as sealing elements, they shall not be pressurized continuously without being secured additionally (e.g. by a padlock).
Couplings with levers (MK type female couplings) shall generally be designed with a clamping ring. The connection is only established if the lever is completely turned.
Type VK male couplings shall be designed so that a sealing cap (MB type) — lead-sealed and with a padlock — can be attached.
All coupling components shall form a functional unit which, when in service, permits reduction of axial movement (tightening possible) if components are worn.
Any residue resulting upon exposure to frost shall not influence the connection of the couplings (they shall be self-cleaning).
Twisting of the hose or vibration during service shall have no adverse effect on the coupling connection.
Couplings shall be secured against unintentional disengagement.
Proper engagement of the coupling claws shall be visible from the outside.
It shall be possible for a single person to handle couplings, without the need for tools.
Couplings shall be designed so that the hose need not be turned more than 15° for connection.
Axial misalignment up to 5° shall not impair the performance of the couplings. |
7 Type approval testing and quality control
7.1 General
When tested for resistance to bursting, the correctly coupled components shall withstand hydrostatic pressure up to a test pressure of 60 bar for 1 minute. This test shall verify that the coupling will withstand the mechanical forces occurring during operation.
The correctly coupled components of nominal size 100 shall remain tight when a bending moment of 140 Nm is applied.
7.2 Testing for trueness to gauge size
To ensure full interchangeability of couplings for tank trucks, all components as specified in 4.2.2, 4.3.2, 4.3.4, 4.4.2 and 4.5.2 shall be tested for their trueness to gauge size with appropriate measuring devices before being assembled. Gauges shall be according to Annex A. |
8 Marking
TW couplings in accordance with this document shall be durably marked on the outside as follows:
— EN 14420-6;
— sign of the manufacturer or trademark;
— type and nominal size DN;
— material number.
NOTE Markings which deviate from this specification are permissible for a transition period of 3 years after publication of this document. |
9 Fitting of hose couplings.
Careful selection of the hose couplings should be made to ensure that the ID, OD, and maximum WP of the hose are within the limits and tolerances of the couplings detailed in this document. Also that the materials have been tested for the products and medium being conveyed.
NOTE Any mismatch could lead to a safety issue. |
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Annex A
(normative)
Gauges for TW tank truck couplings
A.1 General
Gauges in accordance to this document shall be used for checking the dimension of a sealing ring, a curved piece, a tension ring and a cap and for checking the angle between cams of a curved piece as well as the angle between two gaps of a sealing ring.
A.2 Design; designation, dimensions and materials
A.2.1 General
Details not specified in this ducument are at the discretion of the manufacturer with respect to the intended use. Only the dimensions given in Table 1 to Table 6 shall be complied with.
For tolerances shall be according to EN 22768-1 and EN 22768-2.
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Bibliography
[1] EN ISO 8330, Rubber and plastics hoses and hose assemblies – Vocabulary (ISO 8330:1998)
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