ISO 19880-5 pdf download Gaseous hydrogen — Fuelling stations — Part 5: Dispenser hoses and hose assemblies
maximum pressure at which it is permissible to operate a component as specified by the manufacturerat the maximum temperature expected during service
pressure applied during a non-destructive test and held for a specified period of time to prove theintegrity of the construction
This clause applies to newly manufactured hoses and hose assemblies for dispenser hoses connectingthe dispenser to the fuelling nozzle supply port.
Hoses and couplings shall meet the requirements in this document with end fittings selected by themanufacturer, customer, or testing agency as required to connect to the test equipment. Fittings shallbe consistent with the requirements of the appropriate documents in the IS0 19880-series, IS0 17268,or ISO 15649.
The end fitting of the hose assembly may be changed to another type that meets requirements definedabove without the need to repeat the performance tests for verification of the hose assembly and itscoupling as long as the hose coupling remains unchanged.
Some newly manufactured hoses and hose assemblies include vent lines required by some fuellingnozzles.Nozzle vent hose assemblies shall meet the requirements of lSO 16964 or the requirements inthis document and be appropriately rated for operation in the vent system that has been defined basedon the nozzle manufacturer instructions and the dispenser design.
Table 1 converts Hydrogen Service Levels (HSL), as defined in ISo 19880-1, to pressure levels.
When using IS0 16964, the hose rating is 125 % of the working pressure which is 10 % lower than thepressure ratings in Table 1.
A hose assembly shall be designated according to the pressure classes defined in Table 1 or by themanufacturer’s stated pressure rating. The information in Table 1 is taken from ISO 19880-1(andpressure class H11 is added).The pressure rating of the hose assembly shall be equal to or above thedispenser pressure ratings.For further information regarding the relationships between pressureterms, see iso 19880-1.
The hoses and hose assemblies shall be designed to operate at temperatures ranging from-40 °Cto 65°C.
5Materials and construction
The hose and liner shall be constructed with materials that are resistant to corrosion and exposure tohydrogen.
The lining shall be of uniform thickness and free from defects. Defects are defined as but are notlimitedto bubbles, thinning,gouging, or discoloration.
The lining may also consist of multiple material layers.5.3 Reinforcement
The reinforcement consists of one or more layers of suitable wire or textile material applied by anysuitable technique.
The cover shall be resistant to abrasion, cracking, crazing, the effects of exposure to ultraviolet lightand ozone, be of uniform thickness, and free from defects. Defects may include but are not limited tobubbles, thinning,gouging, or discoloration.All outer covering shall either be of a permeable materialor sufficiently perforated to avoid diffused gas build up.
5.5Static electricity dissipation
Static electricity can be generated on the external and interior surface of a hose assembly.5.5.2 External surface
The hose assembly shall be constructed so as to provide an external, electrically conductive, bondingpath between the end couplings to dissipate external static electric charges.
The hose assembly shall be constructed so that the liner provides an adequate internal layer ofprevention to avoid dielectric breakdown by static electricity in the fluid during normal use.