This standard specifies requirements for the ratio of test pressure, minimum burst pressure and design pressure of new and unused hoses with and without couplings for different operating conditions, and for the ratio of test pressure to operating pressure for used hoses.
NEN 5661-1984 history
1984NEN 5661-1984 Rubber and plastics hoses and hose assemblies - Ratio of testing and bursting pressures to design pressures