ISO 3994:2007 pdf download – Plastics hoses — Helical-thermoplastic-reinforced thermoplastics hoses for suction and discharge of aqueous materials — Specification.
1 Scope 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 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
7.7 Minimum bend radius When tested in accordance with ISO 1746, using a minimum radius of curvature of five times the nominal bore in the cases of type 1 and type 2 hoses and eight times the nominal bore in the case of type 3 hoses, hoses shall not crack and shall subsequently pass the proof pressure test (see 7.1). For the purposes of this test, the numerical value of the nominal bore shall be taken as the internal diameter in millimetres. 7.8 Cold-bend radius When tested at − 10 °C ± 2 °C in accordance with the requirements of ISO 4672 after conditioning for 5 h at that temperature and using a minimum radius of curvature of 20 times the nominal bore in the case of type 1 and type 2 hoses and 32 times the nominal bore in the case of type 3 hoses, hoses shall not crack and shall subsequently pass the proof pressure test (see 7.1). For the purposes of this test, the numerical value of the nominal bore shall be taken as the internal diameter in millimetres. 7.9 Loss in mass on heating When determined in accordance with ISO 176:2005 (method B), the loss in mass of the flexible thermoplastics material used in the construction shall not be greater than 4 %.