ISO 3994:2007 pdf free.Plastics hoses — Helical-thermoplastic-reinforced thermoplastics hoses for suction and discharge of aqueous materials — Specification.
ISO 3994 has been prepared to provide minimum acceptable requirements for the satisfactory performance of polymer-reinforced thermoplastics hoses for suction and discharge applications, conveying water, weak aqueous chemical solutions and abrasive solids and slurries.
If there is a special requirement for resistance to deleterious chemicals, this shall be a matter for agreement between the supplier and the purchaser.
This International Standard 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
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 — Vocabulaty
5 Materials and construction
The hoses shall be as uniform as commercially practicable in colour and other physical properties. I hey 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 3994:2007 pdf free download.