ISO 8789-2020 pdf free download – Rubber hoses and hose assemblies for liquefied petroleum gas in motor vehicles — Specification.
This document specifies the requirements for rubber hoses and hose assemblies, up to a maximum hosesize of 19, for use in motor vehicles with liquefied petroleum gas(LPG) installations. The hoses aredesigned for use up to a maximum working pressure of 3,0 MPa (30 bar) and at working temperaturesfrom -40 C up to and including +80 C.
2Normative references
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references, only the edition cited applies.Forundated 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 68-1, ISo general purpose screw threads —Basic profile — Part 1:Metric screw threadsISO 188:2011,Rubber, vulcanized or thermoplastic —Accelerated ageing and heat resistance testsISO 1402,Rubber and plastics hoses and hose assemblies — Hydrostatic testing
ISO 1817,Rubber; vulcanized or thermoplastic — Determination of the effect of liquids
IS0 4080:2009,Rubber and plastics hoses and hose assemblies —Determination of permeability to gasISO 4671,Rubber and plastics hoses and hose assemblies — Methods of measurement of the dimensions ofhoses and the lengths of hose assemblies
ISO 7326:2016, Rubber and plastics hoses —Assessment of ozone resistance under static conditionsISO 8033,Rubber and plastics hoses — Determination of adhesion between components
ISO 8330, Rubber and plastics hoses and hose assemblies — Vocabulary
IS0 10619-2,Rubber and plastics hoses and tubing — Measurement of flexibility and stiffness —Part 2:Bending tests at sub-ambient temperatures
ISO23529,Rubber —General procedures for preparing and conditioning test pieces for physical test methodsASME B1.1, Unified Inch Screw Threads (UN and UNR Thread Form)
3Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8330 apply.
ISO and lEC 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 https://www.electropedia.org/
4Materials and construction4.1 Materials
The hose shall consist of:
a) a smooth-bore rubber lining-resistant rubber suitable for liquefied petroleum gas;
b) a reinforcement of natural textile, synthetic textile or corrosion-resistant metal wire (stainless
steel) applied by any suitable technique;
c)a cover of oil- and weather-resistant rubber (if, however, the hose is reinforced with corrosion-
resistant wire, no cover is required).
4.2Construction
The lining and cover shall be of uniform thickness, concentric and free from holes, porosity and otherdefects.The cover finish may be smooth or fabric-marked.To avoid the formation of bubbles due to gaspermeation, the cover shall be pin-pricked.
NOTE There is a possibility that national regulations define the type of reinforcement to be used.5 Dimensions and tolerance
5.1Inside diameter
When measured in accordance with ISO 4671, the inside diameter shall be between the minimum andmaximum values specified in Table 1.ISO 8789 pdf download.