ISO 4642-2:2015
(Main)Rubber and plastics hoses, non-collapsible, for fire-fighting service — Part 2: Semi-rigid hoses (and hose assemblies) for pumps and vehicles
Rubber and plastics hoses, non-collapsible, for fire-fighting service — Part 2: Semi-rigid hoses (and hose assemblies) for pumps and vehicles
ISO 4642-2:2015 specifies the requirements and test methods for semi-rigid reel hoses for use on fire-fighting vehicles and trailer pumps. The hoses are intended for use at a maximum working pressure of 1,5 MPa for normal pressure hoses (category I) and 4,0 MPa for high pressure hoses (category II). The hoses are further subdivided into types and classes (see Clause 4). ISO 4642-2:2015 applies to delivery hoses for fire-fighting purposes intended for use at a minimum ambient temperature of −20 °C. Hoses conforming to this part of ISO 4642 are intended to be used with fire hose couplings conforming to the relevant national standards couplings. Requirements are also given for hose assemblies (see 6.12) where these are fitted by the hose manufacturer. NOTE 1 Hoses for use at temperatures lower than −20 °C can be supplied by agreement between the manufacturer and purchaser. NOTE 2 All pressures are expressed in megapascals where 1 MPa = 10 bar.
Tuyaux en caoutchouc et en plastique, non aplatissables, pour la lutte contre l'incendie — Partie 2: Tuyaux (et flexibles) semi-rigides pour pompes et véhicules
General Information
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 4642-2
Second edition
2015-12-01
Rubber and plastics hoses, non-
collapsible, for fire-fighting service —
Part 2:
Semi-rigid hoses (and hose
assemblies) for pumps and vehicles
Tuyaux en caoutchouc et en plastique, non aplatissables, pour la lutte
contre l’incendie —
Partie 2: Tuyaux (et flexibles) semi-rigides pour pompes et véhicules
Reference number
ISO 4642-2:2015(E)
©
ISO 2015
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ISO 4642-2:2015(E)
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ISO 4642-2:2015(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Classification . 2
4.1 General . 2
4.2 Classification by types (hose construction) . 2
4.3 Classification by class (materials for lining and cover) . 2
4.4 Classification by category . 3
5 Dimensions, tolerances and maximum mass . 3
5.1 Inside diameter and maximum mass. 3
5.2 Length and tolerances on length . 3
5.3 Concentricity. 4
6 Performance requirements of finished hose . 4
6.1 Hydrostatic requirements . 4
6.1.1 Deformation under maximum working pressure . 4
6.1.2 Deformation under proof pressure . 4
6.1.3 Minimum burst pressure . 4
6.1.4 Kink pressure . 4
6.2 Adhesion . 4
6.3 Accelerated ageing . 5
6.4 Abrasion resistance . 5
6.4.1 General. 5
6.4.2 Abrasion resistance of class 5 and class 6 hoses . 5
6.4.3 Abrasion resistance of classes 1, 2, 3 and 4 hoses . 5
6.5 Low temperature flexibility . 5
6.6 Hot surface resistance . 5
6.7 Ozone resistance. 6
6.8 Bending and crush resistance . 6
6.9 UV resistance (xenon arc lamp) . 6
6.10 Loss in mass on heating . 6
6.11 Deformation under crushing (type C only) . 6
6.12 Hose assemblies . 6
7 Frequency of testing . 6
8 Type tests . 7
9 Test report . 7
10 Recommendation for packaging and storage . 7
11 Marking . 7
Annex A (normative) Kink pressure test . 8
Annex B (normative) Accelerated ageing test . 9
Annex C (normative) Surface abrasion resistance test .10
Annex D (normative) Point abrasion resistance test .12
Annex E (normative) Hot surface resistance test .15
Annex F (normative) Bending and crush resistance test .20
Annex G (normative) Deformation under crushing test .22
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ISO 4642-2:2015(E)
Annex H (normative) Adhesion test (lay-flat fire-fighting hoses) .24
Annex I (normative) Test for fire-fighting hose assemblies .26
Annex J (normative) Type test and routine test .27
Annex K (informative) Production tests .28
Bibliography .29
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ISO 4642-2:2015(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 45, Rubber and rubber products, Subcommittee
SC 1, Rubber and plastics hoses and hose assemblies.
This second edition cancels and replaces the first edition (ISO 4642-2:2009), of which it constitutes a
minor revision.
ISO 4642 consists of the following parts, under the general title Rubber and plastics hoses, non-collapsible,
for fire-fighting service:
— Part 1: Semi-rigid hoses for fixed systems
— Part 2: Semi-rigid hoses (and hose assemblies) for pumps and vehicles
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ISO 4642-2:2015(E)
Introduction
This part of ISO 4642 is mainly concerned with fire service semi-rigid delivery hoses and incorporates
those hoses used manually to control and extinguish fires.
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INTERNATIONAL STANDARD ISO 4642-2:2015(E)
Rubber and plastics hoses, non-collapsible, for fire-
fighting service —
Part 2:
Semi-rigid hoses (and hose assemblies) for pumps and
vehicles
1 Scope
This part of ISO 4642 specifies the requirements and test methods for semi-rigid reel hoses for use on
fire-fighting vehicles and trailer pumps. The hoses are intended for use at a maximum working pressure
of 1,5 MPa for normal pressure hoses (category I) and 4,0 MPa for high pressure hoses (category II). The
hoses are further subdivided into types and classes (see Clause 4).
This part of ISO 4642 applies to delivery hoses for fire-fighting purposes intended for use at a minimum
ambient temperature of −20 °C.
Hoses conforming to this part of ISO 4642 are intended to be used with fire hose couplings conforming
to the relevant national standards couplings.
Requirements are also given for hose assemblies (see 6.12) where these are fitted by the hose
manufacturer.
NOTE 1 Hoses for use at temperatures lower than −20 °C can be supplied by agreement between the
manufacturer and purchaser.
NOTE 2 All pressures are expressed in megapascals where 1 MPa = 10 bar.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 176:2005, Plastics — Determination of loss of plasticizers — Activated carbon method
ISO 188, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests
ISO 1307, Rubber and plastics hoses — Hose sizes, minimum and maximum inside diameters, and tolerances
on cut-to-length hoses
ISO 1402, Rubber and plastics hoses and hose assemblies — Hydrostatic testing
ISO 4671:2007, Rubber and plastics hoses and hose assemblies — Methods of measurement of the
dimensions of hoses and the lengths of hose assemblies
ISO 7326:2006, Rubber and plastics hoses — Assessment of ozone resistance under static conditions
ISO 8033:2006, Rubber and plastics hoses — Determination of adhesion between components
ISO 8330, Rubber and plastics hoses and hose assemblies — Vocabulary
ISO 10619-2:2011, Rubber and plastics hoses and tubing — Measurement of flexibility and stiffness —
Part 2: Bending tests at sub-ambient temperatures
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ISO 4642-2:2015(E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8330 and the following apply.
3.1
semi-rigid hose
hose that maintains its round cross-section even when unpressurized
4 Classification
4.1 General
All types and classes of hose shall be so flexible that they can be rolled and kept on a drum of minimum
diameter 200 mm for 12 mm inside diameter, 19 mm inside diameter and 25 mm inside diameter hose
and of minimum diameter 280 mm for 33 mm inside diameter hose.
Hoses shall be one of two categories distinguished by the maximum working pressure. Each hose shall
be further divided into one of three types distinguished by its construction, and then into six classes
distinguished by the materials used for lining and cover.
NOTE The hose can be coloured by agreement between the purchaser and the manufacturer.
4.2 Classification by types (hose construction)
4.2.1 Type A hoses shall consist of:
a) a seamless rubber or plastics lining;
b) a textile spiral or braided reinforcement;
c) a rubber or plastics cover.
4.2.2 Type B hoses shall consist of:
a) a seamless rubber or plastics lining;
b) a circular woven textile reinforcement with a rigid spiral helix;
c) an uncovered or rubber or plastics cover.
4.2.3 Type C hoses shall consist of:
a) a seamless rubber or plastics lining;
b) any suitable reinforcement;
c) a rubber or plastics cover.
NOTE While the construction of type A and type C hoses can be similar or even identical, the performance
requirements differ for the following: burst and proof pressure, adhesion, hot surface resistance, crush resistance.
4.3 Classification by class (materials for lining and cover)
The hose types shall be further subdivided into six classes dependent on the materials used in their
construction, in accordance with Table 1.
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ISO 4642-2:2015(E)
Table 1 — Classes and materials
Class Lining material Cover material
1 rubber rubber
2 plastics plastics
3 rubber plastics
4 plastics rubber
5 rubber no cover
6 plastics no cover
4.4 Classification by category
All hoses shall be divided into two categories dependent on the maximum working pressure, in
accordance with Table 2.
Table 2 — Maximum working pressure, proof pressure and minimum burst pressure
Type of pressure Category I Category II
Types A and B Types A and B Type C
MPa
Classes 1 to 6 Classes 1 to 6 Classes 1 to 6
Maximum working pressure 1,5 4,0 4,0
Proof pressure 3,0 6,0 8,0
Minimum burst pressure 4,7 10,0 12,0
EXAMPLE A type C hose, constructed with a rubber lining and rubber cover and which has a maximum working
pressure of 4,0 MPa, a proof pressure of 8,0 MPa and a minimum burst pressure of 12,0 MPa is classified as II/C/1.
5 Dimensions, tolerances and maximum mass
5.1 Inside diameter and maximum mass
The inside diameter of the hose and tolerances, when measured in accordance with ISO 4671, using any
suitable method stated in ISO 4671:2007, Clause 4, shall conform to the requirements given in Table 3.
The mass per metre length of the hose shall be in accordance with Table 3.
Table 3 — Inside diameter, tolerances on inside diameter and maximum mass per unit length
Inside diameter Tolerances for inside diameter Mass per unit length
mm mm kg/m
Types A and C Type B Types A and C Type B
max. max.
12 0 to +0,6 — 0,30 —
19 0 to +0,9 0 to +1,5 0,75 0,25
25 0 to +1,2 0 to +1,5 0,90 0,35
33 0 to +1,6 0 to +2,0 1,00 0,50
5.2 Length and tolerances on length
The total length of hose supplied shall be in accordance with the purchaser’s requirements and shall be
stated in metres. Tolerance on length shall be in accordance with ISO 1307.
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ISO 4642-2:2015(E)
5.3 Concentricity
When tested in accordance with ISO 4671:2007, 8.3 (Method 2), the variation from concentricity
measured between inside and outside diameters shall not exceed the following values:
Types A and C 1,5 mm
Type B 0,4 mm
6 Performance requirements of finished hose
6.1 Hydrostatic requirements
6.1.1 Deformation under maximum working pressure
The dimensional stability of the hose, when tested in accordance with ISO 1402, shall conform to the
requirements given in Table 4. The length of the test piece shall be 1 m.
For category I hoses, the initial test pressure shall be 0,07 MPa and the final test pressure shall be
1,5 MPa. For category II hoses, the initial test pressure shall be 0,07 MPa and the final test pressure
shall be 4,0 MPa.
–1
The twist shall be no greater than 30° m for types A and C. For type B, the twist may be greater than
–1
30° m but in this case it shall only be in a direction which closes the coupling and shall be stated in
the test report.
Table 4 — Change in length and external diameter
Tolerances for types A, B and C
%
Change in length 0 to +7,5
Change in external diameter 0 to +7,5
NOTE Hose with a lower maximum change in length can be agreed between the purchaser and manufacturer.
6.1.2 Deformation under proof pressure
A proof pressure hold test shall be carried out on three hose lengths each of 1 m in accordance with
ISO 1402. The proof pressure shall be as given in Table 2 and, on examination during the test, the test
pieces shall not show any evidence of leakage, cracking, abrupt distortion or other signs of failure.
6.1.3 Minimum burst pressure
A burst pressure test shall be carried out in accordance with ISO 1402 on the three test pieces used for
the deformation under proof pressure test, until the hose bursts.
None of the test pieces shall burst at a pressure less than that given in Table 2.
6.1.4 Kink pressure
When tested in accordance with Annex A, the test piece shall neither burst nor show any visible signs of
defect before or after pressurizing at 1,5 MPa for category I hoses and at 4,0 MPa for category II hoses.
6.2 Adhesion
When tested in accordance with Annex H the adhesion between all components shall be not less than
1,5 kN/m for type A hoses, 1,0 kN/m for type B hoses and 2,0 kN/m for type C hoses.
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ISO 4642-2:2015(E)
6.3 Accelerated ageing
When tested in accordance with Annex B, the three test pieces subjected to the burst pressure test shall
conform to the requirements of 6.1.3. The mean of the burst pressure test results shall not decrease by
more than 25 % from the initial mean burst value determined from the results obtained in 6.1.3.
The resultant adhesion of the fourth test piece shall be in accordance with the requirements of 6.2.
NOTE There is no limitation on the increase in the values of these properties.
6.4 Abrasion resistance
6.4.1 General
Abrasion tests are specific to different hose constructions and/or materials. Two procedures with
different values are therefore specified here to avoid unfair discrimination. In addition, it is important
to note that the requirements, revolutions as given in Table 5 and double strokes as given in Table 6,
cannot be correlated.
6.4.2 Abrasion resistance of class 5 and class 6 hoses
When tested in accordance with Annex C and using the number of revolutions given in Table 5, at least four
of the five test pieces shall not burst on being subjected to the normal working pressure given in Table 2.
Table 5 — Abrasion resistance of uncovered hose (classes 5 and 6)
Inside diameter
Number of revolutions
mm
12, 19, 25 and 33 300
6.4.3 Abrasion resistance of classes 1, 2, 3 and 4 hoses
When tested in accordance with Annex D, the average number of double strokes completed before burst
shall be not less than that given in Table 6.
Table 6 — Abrasion resistance of covered hose (classes 1, 2, 3 and 4)
Inside diameter
Minimum number of double strokes before
burst
mm
12, 19, 25 and 33 300
6.5 Low temperature flexibility
The test shall be carried out in accordance with ISO 10619-2:2011, Clause 5 (Method B) using a mandrel
of outside diameter equal to 12 × the inside diameter of the hose. After bending the hose round the
mandrel through 180° for (10 ± 2) s at a temperature of (−20 ± 2) °C, or lower if requested, it shall not
show any signs of breaking or cracking and shall meet the proof pressure requirement given in Table 2.
6.6 Hot surface resistance
When tested in accordance with Annex E at a test temperature of (300 ± 10) °C for types A and B and of
(400 ± 10) °C for type C, in none of the four tests shall the test piece show signs of leakage within 60 s of
the application of the filament rod or on removal of this filament rod after the specified period.
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ISO 4642-2:2015(E)
6.7 Ozone resistance
After carrying out an ozone resistance test in accordance with ISO 7326:2006, 8.1 (Method 1) for all
inside diameter sizes and types, the hose lining and cover shall not show any signs of cracking. The
lining shall be examined by slitting the hose wall.
6.8 Bending and crush resistance
When tested in accordance with Annex F at a temperature of (23 ± 2) °C, the ratio T:D shall not exceed
1,20.
6.9 UV resistance (xenon arc lamp)
NOTE A test for resistance to UV and requirements based on ISO 30013 will be added at next revision of this
part of ISO 4642, when more experience has been acquired.
6.10 Loss in mass on heating
When tested in accordance with ISO 176:2005, 6.2 (Method B), the lining and cover materials shall not
show a loss in mass greater than 4 %.
6.11 Deformation under crushing (type C only)
When tested in accordance with Annex G, the test piece shall allow the free passage of a ball of the
diameter specified in Table 7.
Table 7 — Deformation under crushing
Crush dimension,
Inside diameter Minimum force Ball diameter
outside diameter
mm mm N mm
12 6 500 10
19 9,5 500 16
25 12,5 500 21
33 16 500 27
6.12 Hose assemblies
In some circumstances it is not the manufacturer who supplies the hose complete with couplings
attached. In this case, the purchaser should be aware that this is outside the scope of this part of
ISO 4642 and should ensure by other means that the security of the hose assembly has been tested.
Where the hose couplings are fitted by the hose manufacturer, the security of the hose assembly shall
be tested in accordance with Annex I, by the manufacturer, before delivery to the purchaser. There shall
be no sign of leakage or movement of the hose from the coupling.
The hose manufacturer should fit hose couplings that conform to any relevant national standards or
legal requirements of the country of use.
7 Frequency of testing
Type testing and routine testing and the minimum frequency of such tests shall be as specified in Annex J.
Type tests are those tests carried out in order to obtain product approval.
Routine tests are those carried out on each length of hose or hose assembly.
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ISO 4642-2:2015(E)
Production tests are those tests, specified in Annex K, which should preferably be carried out to control
the quality of manufacture. The frequencies specified in Annex J are given as a guide only.
8 Type tests
Type testing is carried out in order to confirm that all the materials, construction and test requirements
of this part of ISO 4642 have been met by the method of manufacture and hose design.
Type testing shall be repeated at a minimum of every five years or whenever there is a change in the
method of manufacture of materials.
9 Test report
A test report shall be supplied if requested by the customer.
10 Recommendation for packaging and storage
Details of packaging and storage are given in ISO 8331.
11 Marking
Each length of hose shall be legibly and permanently marked with the following minimum information,
at least twice per length, at both ends, for type B hoses and along the whole length at minimum intervals
of 2 m for type A and type C hoses:
a) manufacturer’s name or trademark;
b) number of this part of ISO 4642, i.e. ISO 4642-2;
c) hose category;
d) type, class;
e) inside diameter in millimetres;
f) maximum working pressure in MPa (bar);
g) quarter and year of manufacture;
h) test temperature if lower than −20 °C (see 6.5);
i) approval number and certifying body or its reference, where applicable.
EXAMPLE Man-ISO 4642-2-I-A-2–19- (15 bar) - 2Q/2015
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ISO 4642-2:2015(E)
Annex A
(normative)
Kink pressure test
A.1 Principle
This tests the hose for leakage or damage in a kinked test piece held under pressure.
A.2 Test piece
The test piece shall be a hose assembly, 2,0 m in length.
A.3 Apparatus
A.3.1 Source of hydrostatic pressure, with water as the test medium, capable of maintaining a
pressure of 1,5 MPa for category I hose and of 4,0 MPa for category II hose.
A.4 Procedure
Connect the test piece to the pressure source and fill with water, expelling all air before securely
clamping the free end of the hose. Maintain a pressure of 0,07 MPa in the test piece while bending it
through 180° at a point approximately midway along its length. Tie the free end of the hose back on
itself, as close as possible to the secure end, so as to form a sharp kink, ensuring that the tie does not
prevent subsequent expansion of the diameter of the test piece.
Raise the pressure in the test piece to that given in 6.1.4 over a period of 60 s. Maintain
...
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