Mechanical Steam Purity

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есть просто steam purity
а есть mechanical
2.3 STEAM PURITY 12
2.4 MECHANICAL STEAM PURITY – BLOW-OUT PROCEDURE 13
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2.2 Steam Purity
Steam purity shall be of high quality such that it does not cause deposits in the steam pre-heaters, fittings, heaters or turbine.
2.3 Mechanical Steam Purity – Blow-Out Procedure
Mechanical steam purity shall be of high quality such that it does not cause any damages of quality of blades and nozzles surfaces in the turbine flow path.

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отсутствие химических примесей
отсутствие механических примесей