ISO 7369:2020 pdf download – Pipework—Metal hoses and hose assemblies – Vocabulary.
3.1.3
nominal pressure
PN
numerical designation which is a convenient rounded number for reference purposes
Note ito 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 ito 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 ito entry; The design pressure In an Installation should be equal to or higher than the nwxsmwn operating pressure (3J.A).
3.1.6
niaxirnum allowable pressure
maximum pressure at the design temperature for which the hose assembly is designed, as specified by the manufacturer
Note Ito entry: the maximum allowable pressure should he 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 (11.5) for which the hose assembly Is designed, as specified by the manufacturer
3.1.10
minimum allowable temperature
minimum temperature at the design pressure (11.5) for which the hose assembly is designed, as specified by the manufacturer
3.1,11
flexibility
capability of a metal hose (ILl) to be repeatedly bent during operation
3.1.12
pliability
capability of a metal hose (3.1.1) or tube to be bent easily for installation
3.1.13
bend radius
radius measured to the centre line of the hose
3.1.14
minimum bend radius
minimum radius at which the hose is designed to operate
3.2 Construction
3.2.1 Metal hoses (stripwound or corrugated)
3.2.1.1
strip
sheet metal suitable for cold forming
3.2.1.2
packing
component used to improve the leak-tightness of stripwound metal hoses (ILL1)
3.2.1.3
profile
geometrical form ola hose wall when sectioned along its axis
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 ON followed by a dimensionless whole number, which is indirectly related to the physical size, In nillllmetres. of the inside diameter (32..L).
Note 2 to entry: This defined number does not represent a measurable value anti should not be used for calculation purposes except where specilied 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
3.2.1.8
pitch of hose profile
distance between two successive identical points measured on the profile (3.2.1.3) on the rectilinear hose.