ISO 3994:2007 pdf download.Plastics hoses - Helical-thermoplastic-reinforced thermoplastics hoses for suction and discharge of aqueous materials一Specification
I Scope
ISO 3994:2007 pdf download specifies the requirements for three types of helical-thermoplastic-reinforced thermoplastics hoses for suction and discharge of water, weak aqueous chemical solutions and abrasive solids and slurries, for use in the ambient temperature range from — 10 °C to + 55 °C.
The three types of hose are for light-, medium- and heavy-duty applications.
The types of hoses covered in this International Standard are not intended for use with flammable or combustible materials, nor with aromatic solvents.
NOTE Hoses of a similar construction for suction and discharge for fire-fighting are specified in ISO 14557, Fire-fighting hoses — Rubber and plastics suction hoses and hose assemblies.
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.
ISO 37, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties 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 1746, Rubber or plastics hoses and tubing — Bending tests
ISO 4672, Rubber and plastics hoses — Sub-ambient temperature flexibility tests
ISO 8330, Rubber and plastics hoses and hose assemblies — Vocabulary
ISO 8331, Rubber and plastics hoses and hose assemblies — Guidelines for selection, storage, use and maintenance
ISO 11758:1995, Rubber and plastics hoses — Exposure to a xenon arc lamp — Determination of changes in colour and appearance
ISO 23529, Rubber — General procedures for preparing and conditioning test pieces for physical test methods
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8330 apply.
4 Classification
Three types of hoses are specified, related to the maximum working pressure and suction pressure (see Tables 4 and 5):
type 1: light-duty service;
type 2: medium-duty service; type 3: heavy-duty service.
All types are designed to operate in the ambient temperature range — 10 °C to + 55 °C.
5 Materials and construction
The hoses shall be as uniform as commercially practicable in colour and other physical properties. They shall consist of a flexible thermoplastics material supported within the material by a helix of thermoplastic material of a similar molecular structure. The reinforcing and flexible components of the wall shall be fused together and free from visible cracks, porosity, foreign inclusions or other defects such as are liable to cause failure of the hose in service.
6 Dimensions and tolerances
6.1 Nominal bores, internal diameters and tolerances
The internal diameters and tolerances of hoses of different nominal bores shall meet the requirements given in Table 1.
6.2 Length tolerances
The tolerances on cut lengths shall be in accordance with ISO 1307.ISO 3994 pdf download.