ISO 14557:2021 Fire-fighting hoses — Rubber and plastics suction hoses and hose assemblies

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Fire-fighting hoses — Rubber and plastics suction hoses and hose assemblies

1 Scope

This document establishes the requirements and test methods for rubber and plastics suction hoses for fire-fighting purposes. These hoses can also be used manually to supply unpressurized water to the pump or for water discharge.

NOTE All pressures are expressed in megapascals and in bar (1 MPa = 10 bar).

Additional requirements are specified for hose assemblies, that is, hoses with couplings already fitted, where this is carried out by the hose manufacturer (see Clause 8).

Type A (rubber) hoses are intended for use at a minimum temperature of −20 °C and Type B (thermoplastics) hoses are intended for use at a minimum temperature of −10 °C.

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.

ISO 176:2005, Plastics — Determination of loss of plasticizers — Activated carbon method

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, Rubber and plastics hoses and hose assemblies — Methods of measurement of the dimensions of hoses and the lengths of hose assemblies

ISO 7233, Rubber and plastics hoses and hose assemblies — Determination of resistance to vacuum

ISO 7326:2016, Rubber and plastics hoses — Assessment of ozone resistance under static conditions

ISO 8033, Rubber and plastics hoses — Determination of adhesion between components

ISO 8330, Rubber and plastics hoses and hose assemblies — Vocabulary

ISO 10619-1:2017, Rubber and plastics hoses and tubing — Measurement of flexibility and stiffness — Part 1: Bending tests at ambient temperature

ISO 10619-2:2017, Rubber and plastics hoses and tubing — Measurement of flexibility and stiffness — Part 2: Bending tests at sub-ambient temperatures

ISO 30013:2011, Rubber and plastics hoses — Methods of exposure to laboratory light sources — Determination of changes in colour, appearance and other physical properties

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 8330 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 http:// www .electropedia .org/ 4 Classification

4.1 Type (hose construction)

Type A hoses shall consist of:

a) a rubber lining uniform in thickness, reasonably concentric and free from holes, porosity and other defects;

b) a textile reinforcement applied uniformly by any suitable method;

c) an embedded wire helix or helices evenly and uniformly applied and made from metallic material that allows the hose to meet the specification requirements;

d) a rubber cover, ozone resistant, uniform in quality and thickness and free from defects.

Type B hoses shall consist of a flexible, thermoplastics material supported in its mass by a helix of rigid polymeric material. The reinforcement and flexible components of the hose wall shall be fixed and free from cracks, porosity, foreign inclusions or other defects.

4.2 Hose ends

The hose ends shall be compatible with suction hose couplings conforming to the relevant national standards.

Where soft ends or wire-free ends are used for type A hoses, they should have an additional rubberized textile reinforcement applied as a cuff over the wire-free portion and the first turn of the embedded wire helix.

The hose ends should be capped or sealed to prevent ingress of water.

Specifying the dimensions of the soft or wire-free ends may be the subject of an agreement between the manufacturer and the purchaser.

5 Dimensions, tolerances and maximum mass

5.1 Inside diameter and maximum mass

The dimensions of the hose and tolerances, when measured in accordance with ISO 4671, shall conform to the requirements given in Table 1. The mass per metre of length of the hose shall be in accordance with Table 1.

Table 1 — Inside diameter, tolerances on inside diameter and maximum mass per unit length

Inside diameter Tolerances for inside Maximum mass per unit length

mm diameter kg/m

Type A Type B

mm

45 −0,2 to +1,0 2,0 1,0

50 −0,2 to +1,0 2,3 1,6

52 −0,2 to +1,0 2,3 1,6

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