ISO 7369:2020 pdf free.Pipework一Metal hoses and hose assemblies一Vocabulary.
3.1 General
3.1.1 metal hose metal duct, generally of circular or polygonal section, able to withstand repeated bending without damage
3.1.1.1 stripwound metal hose hose manufactured from a helically wound pre-formed strip, generally with a right-hand lead, where the turns, with or without packing (3.2.1.2), are connected together by single or double overlapping and flexibility (3.1.11) is obtained by sliding adjacent turns over each other
3.1.1.2 corrugated metal hose pressure-tight hose made from tube or from strip (3.2.1.1) with corrugations, helicoidal or annular to the axis of the hose, made by deforming the metal, and where flexibility (3.1.11) and pliability (3.1.12) are obtained by bending of the corrugations
3.1.2 metal hose assembly assembly of a metal hose (3.1.1) with its end fittings (3.2.2.4)
3.1.3 nominal pressure PN numerical designation which is a convenient rounded number for reference purposes
Note 1 to entry: This defined number is a dimensionless number indirectly related to a pressure value in bar (1 bar = 0,1 MPa].
Note 2 to entry: The definition is adapted from ISO 7268. See also EN 1333.
3.1.4 maximum operating pressure maximum pressure that may be reached in an installation
Note 1 to entry: Care should be taken to ensure that both the temperature and the pressure are quoted together.
3.1.5 design pressure maximum pressure at the design temperature for which the hose assembly needs to be designed, as specified by the customer
Note 1 to entry: The design pressure in an installation should be equal to or higher than the maximum operating pressure (3.1.4)].
3.1.6 maximum allowable pressure maximum pressure at the design temperature for which the hose assembly is designed, as specified by the manufacturer
Note 1 to entry: The maximum allowable pressure should be equal to or higher than the design pressure (3.1.5).，
Note 2 to entry: The maximum allowable pressure should be lower than or equal to the lowest value of the maximum allowable pressures of its components.
Note 3 to entry: Care should be taken to ensure that both the temperature and the pressure are quoted together.
3.1.7 burst pressure pressure reached before any part of the hose assembly fails by leakage or rupture of any of the components
3.1.8 test pressure differential pressure to which the hose assembly or the component is subjected to during a test at ambient temperature
3.1.9 maximum allowable temperature maximum temperature at the design pressure (3.1.5) for which the hose assembly is designed, as ， specified by the manufacturer
3.1.10 minimum allowable temperature minimum temperature at the design pressure (3.1.5) for which the hose assembly is designed, as ， specified by the manufacturer
3.2.1.4 cross section geometrical form of a hose when sectioned perpendicular to its axis
3.2.1.5 nominal size of metal hose DN alphanumeric designation of size for components of a pipework system, which is used for reference purposes
Note 1 to entry: It comprises the letters DN followed by a dimensionless whole number, which is indirectly related to the physical size, in millimetres, of the inside diameter (3.2.1.6].
Note 2 to entry: This defined number does not represent a measurable value and should not be used for calculation purposes except where specified in the relevant standard.
Note 3 to entry: The definition is adapted from ISO 6708.
3.2.1.6 inside diameter bore diameter of the largest sphere which can pass through the hose
3.2.1.7 outside diameter diameter of the cylinder enveloping the hose when in a rectilinear position
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