Advertisement
2.2.10 The thickness gauge in its transportation packing is resistant to the effect
of the following climatic factors:
― ambient air temperature from - 40 to + 55 °С;
― relative air humidity up to 98 % at 35 °С.
2.2.11 The mean expected time to first failure of the thickness gauge is no less
than 32000 hours.
Failure criterion is non-conformity to para 2.1.3, 2.2.1.
2.2.12 The mean total lifetime of the thickness gauge without transducers till its
limit state, taking into account the spare parts and maintenance in accordance with
the regulatory documents, is no less than five (5) years.
The limit state criterion for the thickness gauge is economic inexpedience of its
repair in order to restore the instrument performance.
2.2.13 The mean total lifetime of transducers is no less than six (6) months*.
* if testing is carried out on surfaces, whose roughness does not exceed Rz 80,
and maintenance is performed according to para 8.1.
5
Advertisement
