Bsi bs en 14420 6 2013

NORME EUROPÉENNE 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

Hose fittings with TW couplings

A hose fitting with TW coupling for female coupling (type MKS) is shown in Figure 1

A hose fitting with TW coupling for male coupling (type VKS) is shown in Figure 2

A parts list for Figure 1 and Figure 2 is given in Table 1

Figure 1 — Hose fitting with TW coupling for female coupling (type MKS)

Figure 2 — Hose fitting with TW coupling for male coupling (type VKS)

1 Tension ring with levers according to 5.3.4.2 and 5.3.4.3

3 Hose tail type MKST according to 5.1.2

4 Clamp unit according to EN 14420-3

5 Hose tail type VKST according to 5.1.3

Designation of a complete hose fitting shall be according to EN 14420-1

5.1.2 Hose tail with female TW coupling

Dimensions for a hose tail with female TW coupling (type MKST) are shown in Figure 3; values are given in Table 2

Key a Coupling side part of the tail; other dimensions and specifications according to 5.3. b Hose side part of the tail; dimensions according to EN 14420-2.

Figure 3 — Hose tail type MKST

Table 2 — Hose tail type MKST

DN For hose internal diameter l 1 l

This article provides an example of ordering a complete hose tail featuring a female TW coupling (type MKST) The coupling connection side has a nominal size of DN 50, while the hose connecting side is sized at DN 40 The hose tail is constructed from a copper-zinc alloy (CW614N).

Hose tail EN 14420-6 — MKST — 50 — 40 — CW614N

5.1.3 Hose tail with male TW coupling

Dimensions for a hose tail with male TW coupling (type VKST) are shown in Figure 4; values are given in Table 3

Key a Coupling side part of the tail; other dimensions and specifications according to 5.2 b Hose side part of the tail; dimensions shall be according to EN 14420-2.

Figure 4 — Hose tail type VKST

Table 3 — Hose tail type VKST

DN For hose internal diameter d 1 l

Hose connection Tolerances min ± 0,5 min max

This article provides an example of a complete hose tail ordering designation featuring a male TW coupling (type VKST) with a nominal size of DN 80 on both the coupling and hose connection sides, constructed from stainless steel (1.4571).

For a hose tail with a nominal size of DN 50 on the male coupling connection side and DN 40 on the hose connection side, an ordering designation for a protective ring made of polyamide (PA) is required.

Male coupling (type VK)

A male coupling (type VK) is shown in Figure 6 A parts list for Figure 6 is given in Table 5

Figure 6 — Male coupling (type VK)

Pos No Number of pieces Designation

8 1 Thread gasket a a Dimensions according to EN 14420-5

Example for an ordering designation of a complete male coupling (type VK) with nominal size DN 80 and maximum working pressure 16 bar, made of copper-zinc alloy (CW614N):

For connection with hoses, hose tails according to EN 14420-5 can be screwed into the male coupling (type VK) or one-piece hose fittings in accordance with 5.1 can be used

5.2.2.1 Body DN 50 and DN 80 (item No 1)

Dimensions for bodies with nominal size DN 50 and DN 80 are shown in Figure 7; values are given in Table 6

The spatial arrangement may differ from the drawing specifications It is essential to mark the straight knurled portion and ensure that the thread complies with EN 14420-5 standards Additionally, the angle between the cams, which should be 90°, must be verified using a gauge as outlined in Annex A.

Figure 7 — Body DN 50 and DN 80

Table 6 — Dimensions for body DN 50 and DN 80

Gradient of the curve element

For DN 50 and DN 80, h 3 should be checked with a gauge according to Annex A

Dimensions for bodies with nominal size DN 100 are shown in Figure 8

The spatial arrangement of the components does not need to match the drawing Thread specifications should adhere to EN 14420-5 standards It is essential to verify the gauge dimensions of all three curved elements using a gauge as outlined in Annex A Additionally, a gradient of 14 mm must be maintained.

Example for an ordering designation of a body item No 1 (type VK) with nominal size DN 80 for a maximum working pressure of 16 bar, made of copper-zinc alloy (CW614N):

Table 7 — General tolerances for body dimensions

Range of nominal sizes (DN)

3 to 6 > 6 to 18 > 18 to 30 > 30 to 50 > 50 to 80 > 80 to 120 > 120 to 200 ± 0,2 ± 0,3 ± 0,4 ± 0,5 ± 0,65 ± 0,8 ± 0,9

Female coupling (type MK)

5.3.1 Female coupling (type MK) DN 50 and DN 80

A female coupling (type MK) is shown in Figure 9 A parts list for Figure 9 is given in Table 8

Table 8 — Parts list Item No Number of pieces Designation

9 1 Fastening component a Dimensions according to EN 14420-5:2013, 5.5.

5.3.2 Female coupling (type MK) DN 100

A female coupling (type MK) with nominal size DN 100 is shown in Figure 10

Key a Gauge dimension shall be checked with a gauge according to Annex A. b Thread according to EN 14420-5

Example for an ordering designation of a complete female coupling (type MK) with nominal size DN 80, for a maximum working pressure of 16 bar, made of copper-zinc alloy (CW614N):

5.3.4.1 Gasket fixture DN 50 and DN 80 (item No 2)

Dimensions for gasket fixtures for nominal size DN 50 and DN 80 are shown in Figure 11; values are given in Table 9

Key a Straight knurled portion b Thread according to EN 14420-5 c Magnified

Table 9 — Dimensions of gasket fixture a

2 shall be checked according to Annex A b Optional

5.3.4.2 Tension ring DN 50 and DN 80 (item No 3)

Dimensions for tension rings for nominal size DN 50 and DN 80 are shown in Figure 12; values are given in Table 10

Gradient of the curve- element

9 and h 11 shall be checked with gauge according to Annex A

Example for an ordering designation of a tension ring item No 3 with nominal size DN 80, for a maximum working pressure of 16 bar, made of copper-zinc alloy (CW614N):

5.3.4.3 Lever DN 50 and DN 80 (item No 4)

Dimensions for the lever for nominal sizes DN 50 and DN 80 are illustrated in Figure 13, with corresponding values listed in Table 11 Additionally, general tolerances for the dimensions of the lever and dust cap are provided in Table 12.

4 and other dimensions shall match with the dimensions of the tension ring item No 3

Table 12 — General tolerances for lever and dust cap dimensions

Range of nominal sizes (DN)

3 to 6 > 6 to 18 > 18 to 30 > 30 to 50 > 50 to 80 > 80 to 120 > 120 to 200

5.3.4.4.1 Main gasket DN 50 and DN 80

Dimensions for main gaskets for nominal size DN 50 and DN 80 are shown in Figure 14; values are given in Table 13

Figure 14 — Main gasket DN 50 and DN 80

Designation of a main gasket (item No 5) with nominal size DN 80, for a maximum working pressure of 16 bar, made of rubber/plastics (E):

Table 13 — Main gasket dimensions Nominal size

Dimensions for main gaskets for nominal size DN 100 are shown in Figure 15

Designation of a main gasket (item No 5) with nominal size DN 100, for a maximum working pressure of

16 bar, made of rubber/plastics (E):

Thread gaskets shall be in accordance with EN 14420-5:2013, 5.5

At the discretion of the manufacturer.

Dust cap (type MB)

The article features a dust cap (type MB) for nominal sizes DN 50 and DN 80, illustrated in Figure 16, and for nominal size DN 100, shown in Figure 17 Additionally, a comprehensive parts list corresponding to both figures is provided in Table 14.

Figure 16 — Dust cap DN 50 and DN 80 Figure 17 — Dust cap DN 100

Example for an ordering designation of a complete dust cap (type MB) with nominal size DN 80 for a maximum working pressure of 16 bar, made of copper-zinc alloy (CW614N):

Dust cap EN 14420-6 — MB80 — 16 —CW614N

Item No Number of pieces Designation

5.4.2.1 Dust cap DN 50 and DN 80 (item No 6)

Dimensions of caps for nominal size DN 50 and DN 80 are shown in Figure 18; values are given in Table 15

Key a Marking b Eyes for S-shaped hooks and arrangement of eyes at the discretion of the manufacturer.

Figure 18 — Dust cap DN 50 and DN 80

− 0 min min ± 0,6 ± 0,5 ± 0,2 max min min

2 Gradient of the curve element

1 0 ± 0,2 max + ± 0,2 min min min min min

80 3,5 6,5 9 12,5 35,9 1 145 38 8 3,5 14 a Dimension h 6 shall be checked with gauge according to Annex A.

5.4.2.2 Dust cap DN 100 (item No 6)

Dimensions of dust caps for nominal size DN 100 are shown in Figure 19

Key a The spatial arrangement at the periphery do not have to correspond to the drawing. b Gradient 14 mm c Gauge dimension 7 shall be checked with gauge according to Annex A

Designation of a dust cap (item No 6), type MB, with nominal size DN 80, for a maximum working pressure of

16 bar, made of copper-zinc alloy (CW614N):

Dust cap EN 14420-6 — 6 — MB — 80 — 16 — CW614N Dust caps made of aluminium shall be anodised with a minimum oxide thickness of 20 àm

For general tolerances see Table 12

At the discretion of the manufacturer.

Dust plug (type VB)

Figures 20 and 21 illustrate dust plugs (type VB) for nominal sizes DN 50, DN 80, and DN 100, respectively Additionally, Table 16 provides a comprehensive parts list corresponding to these figures.

Figure 20 — Dust plug DN 50 and DN 80 Figure 21 — Dust plug DN 100

Example for an ordering designation of a complete dust plug (type VB) with nominal size DN 80, for a maximum working pressure of 16 bar, made of copper-zinc alloy (CW614N):

Dust plug EN 14420-6 — VB — 80 — 16 — CW614N

Item No Number of pieces Designation

5.5.2.1 Dust plug DN 50 and DN 80 (item No 7)

Dimensions of dust plugs for nominal size DN 50 and DN 80 are shown in Figure 22; values are given in Ta- ble 17

Key a Marking b Stop cam at the end of the curve

Figure 22 — Dust plug DN 50 and DN 80

0 0 + g 3 min h 1 min h 2 ± 0,5 h 3 a ± 0,2 r Gradient of the curve element

80 8 5 7 3,5 35 20 30,5 4,25 14 a Dimension h 3 shall be checked with gauge according to Annex A b Angle between cams shall be checked with gauge according to Annex A

5.5.2.2 Dust plug DN 100 (item No 7)

Dimensions of dust plugs for nominal size DN 100 are shown in Figure 23

The key marking and gauge dimensions must be verified, ensuring that the spatial arrangement at the periphery does not necessarily align with the drawing Additionally, a gradient of 14 mm is specified, and the gauge dimensions for all three curve elements should be checked in accordance with Annex A.

Example for an ordering designation of a dust plug (item No 7), type VB, with nominal size DN 80 for a maximum working pressure of 16 bar, made of copper-zinc alloy (CW614N):

Dust plug EN 14420-6 — 7 —VB — 80 — 16 — CW614N For general tolerances see Table 12

General

All manufacturing processes must ensure that the minimum mechanical properties meet or exceed those of forgings for aluminum and brass, and investment casting for stainless steel, as outlined in this document.

Hose tail types MKST and VKST

The materials specified are suitable for the body of male coupling type VK, as well as for the gasket fixture, tension ring, and lever of female coupling type MK, along with female dust coupling type MB and male dust coupling type VB Additionally, hose tail types MKST and VKST must be constructed from copper-zinc alloys.

Parts forged from extruded materials:

CuZn39Pb3-H080 material number CW614N according to EN 12420

CuZn40Pb2-H080 material number CW617N according to EN 12420 b) wrought aluminium alloys

EN AW-AL Si1MgMn material number EN AW-6082 according to EN 586-2 c) stainless steels

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

Protection rings shall be made from non-asbestos materials

6.4 Thread gasket of male coupling type VK

Materials shall be selected to be resistant to the fluid/product/liquid being conveyed

The materials shall preferably be selected from the following: a) Polyurethane (PUR); b) Polytetrafluoroethylene (PTFE); c) Nitrile butadiene rubber (NBR); d) Fluoro rubber (FPM); e) Ethylene propylene diene monomer (EPDM)

Thread gaskets shall be made from non-asbestos materials

6.5 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/mm 2 , at the discretion of the manufacturer

6.6 Main gasket of female coupling type MK

Main gaskets shall be made from rubber/plastics (E), resistant to abrasion, fuel and oil

For the transport of different fluids, a suitable material shall be agreed by manufacturer and purchaser

When using profiled gaskets, the exchangeability of gaskets and the procedure of coupling shall not be affected adversely by deformation of the gaskets

Main gaskets shall be made from non-asbestos materials

MB type female dust couplings and VB type male dust couplings are designed solely as sealing elements They should not be subjected to continuous pressure unless they are additionally secured, such as with a padlock.

Couplings with levers (MK type female couplings) shall generally be designed with a tension 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

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

When selecting hose couplings, it is crucial to ensure that the inner diameter (ID), outer diameter (OD), and maximum working pressure (WP) of the hose align with the specified limits and tolerances Additionally, it is important to verify that the materials used have been tested for compatibility with the products and mediums being conveyed.

NOTE Any mismatch could lead to a safety issue

TW couplings must be clearly and durably marked on the exterior when sufficient surface area is available, in accordance with EN 14420-6 The required markings include the manufacturer's name or trademark, the type and nominal size of the coupling, and the material number, which is essential for stainless steels.

10 Type testing and quality control

Type testing and quality control shall be done according to EN 14420-1:2013, Clause 7

Gauges for TW tank truck couplings

This document specifies the use of gauges for measuring the dimensions of gasket fixtures, curved pieces, tension rings, and dust caps Additionally, it outlines the importance of checking the angles between the cams of a curved piece and the angles between the gaps of a gasket fixture.

A.2 Design; designation, dimensions and materials

The manufacturer retains discretion over any unspecified details regarding intended use, and compliance is required solely with the dimensions outlined in Tables 1 to 6.

Tolerances shall be according to EN 22768-1 and EN 22768-2

For position No 1 to 4 see Table 2 a Marking

Example for an ordering of designation of a gauge A1 for a gasket fixture with a nominal size DN 80:

Table A.1 — Gauge A1 for gasket fixture with nominal size DN 50 and DN 80

80 79 87 95,3 103 98 3,7 25 7,5 85 a For gasket fixture with connected hose tail.

• • • Refinish a Marking b Gradient of the curve element 14 mm

Figure A.2 — Gauge A1 with DN 100 for a gasket fixture with a tension ring

Table A.2 — Material and design of gauge A1 with the nominal size DN 50 and DN 80

1.0601 heat treated gauge surface protected

Table A.3 — Material and design of gauge A1 with the nominal size DN 100

At the discretion of the manufacturer

Table A.4 — Dimensions of gauge B1 for gasket fixtures

Table A.5 — Material and design of gauge B1 for gasket fixtures with the nominal size DN 50 and DN 80

EN 10083-2 heat treated, surface protected

For position No 1 to 3 see Table A.7 a Marking b Gradient of the curve element c GO d NOT GO e Refinish

For position No 2 to 4 see Table A.7

Figure A.5 — Gauge B for tension rings with DN 100

Table A.7 — Material and design for gauge B for tension rings with DN 50, DN 80 and DN 100

1.0601 heat treated gauge surface protected

A.2.4 Gauge for curved pieces and dust plugs

Figure A.6 — Gauge A1 for DN 50 and DN 80

Example for an ordering designation of gauge A1 for a curved piece with nominal size DN 80:

Table A.8 — Dimensions for gauge A1 for curved pieces and dust plugs

2 l Gradient of the curve element

Key a Handle at the discretion of the manufacturers b Marking c Gradient of the curve element 14 mm d GO e NOT GO

Figure A.7 — Gauge A1 for curved pieces and dust plugs with DN 100

Table A.9 — Material and design of gauge A1 for curved pieces and dust plugs

EN 10083-2 1.0601 heat treated gauge surface protected

3 1 handle At the discretion of the manufacturer

For position No 1 to 4 see Table A.11 a Marking

Figure A.8 — Gauge B1 for a curved piece and dust plug with DN 50, DN 80 and DN 100

Example for an ordering designation of a gauge B1 for a curved piece with nominal size DN 80:

Table A.10 — Dimensions of gauge B1 for curved pieces and dust plugs

Table A.11 — Material and design of gauge B1 for curved pieces and dust plugs

For position No 1 to 3 see Table A.11 a Gradient of the curve element b GO c NOT GO

Key a Marking b Handle at the discretion of the manufacturers c Gradient of the curve element 14 mm d GO e NOT GO f Refinish

Figure A.10 — Gauge A for dust caps with DN 100

Table A.13 — Gauges for DN 50, DN 80 and DN 100

EN 10083-2 1.0601 heat treated gauge surface protected

Gauges in accordance with this document shall be marked with the date of producing (quarter/year) For example for gauge A1:

[1] 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)

[2] EN ISO 6708:1995, Pipework components — Definition and selection of DN (nominal size) (ISO 6708:1995)

Thread gasket of male coupling type VK

Materials shall be selected to be resistant to the fluid/product/liquid being conveyed

The materials shall preferably be selected from the following: a) Polyurethane (PUR); b) Polytetrafluoroethylene (PTFE); c) Nitrile butadiene rubber (NBR); d) Fluoro rubber (FPM); e) Ethylene propylene diene monomer (EPDM)

Thread gaskets shall be made from non-asbestos materials.

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/mm 2 , at the discretion of the manufacturer.

Main gasket of female coupling type MK