Is a two-tier system mandatory?
Is it mandatory to propose a two-tier system as a solution? Very different competencies are required in the two tiers. If a proposal in the first tier for leakage detection is designed in such a way that conventional sealing measures are sufficient and well blowouts cannot occur, can a proposal for the second stage be omitted?
Sherry Borener commented
A proposal must propose a 2 tiered system solution.