ISO 21755-2:2020 pdf free

ISO 21755-2:2020 pdf free.Motorcycles一Measurement method for evaporative emissions
Following the durability testing, the fuel tank shall be soaked according to the requirements specified in 4.3 to ensure that the permeation rate is stable. The period of slosh testing and the period of ultraviolet testing may be considered to be part of this soak, provided that the soak begins immediately after the slosh testing. To determine the final permeation rate, the fuel tank shall be drained and refilled with fresh reference fuel set out in 4.2. The permeation test run laid down in 4.4 shall be repeated immediately after this soak period. The same test fuel requirement shall be used for this permeation test run as for the permeation test run conducted prior to the durability testing. The final test results shall be calculated in accordance with 4.5.
The manufacturer shall conduct a fuel line assembly test, including the fuel hose clamps and the material to which the fuel lines are connected on both sides, by performing a physical test in accordance with the requirements in 4.6.2 to 4.6.3. The piping material to which the fuel lines are connected at both sides of the fuel line shall be plugged with impermeable material. The fuel hose clamps shall be tightened with the torque specified for series production.
Following the durability testing, the fuel line assembly shall be soaked according to the requirements specified in 4.3 to ensure that the permeation rate is stable. The period of slosh testing and the period of ultraviolet testing may be considered to be part of this soak, provided that the soak begins immediately after the slosh testing. To determine the final permeation rate, the fuel line assembly shall be drained and refilled with fresh reference fuel set out in 4.2. The permeation test run laid down in 4.4 shall be repeated immediately after this soak period. The same test fuel requirement shall be used for this permeation test run as for the permeation test run conducted prior to the durability testing. The final test results shall be calculated in accordance with 4.5.ISO 21755-2 pdf free download.