differential pressure

[knopka]

Уважаемые форумчане, как правильно перевести differential pressure таком контексте:
Речь идет о гидроиспытаниях комбинированных сосудов (Combination Units), у которых есть общие элементы (common elements):
Combination Units designed to operate independently shall be tested by one of the following methods.
1) Common elements did not design to differential pressure:
Shall be tested as separate vessel (Shell Side and Tube Side) and each chamber shall be tested without pressure in the adjacent chamber; in such a manner that leaks at the tube joints can be detected from at least one side.
2) Common elements designed to differential pressure larger than higher MAWP of adjacent chambers:
Normally this case happens in common elements as tubesheet and tubes, when exchanger is designed to differential pressure. The minimum hydrostatic test pressure of common elements shall be at least their design differential pressure, corrected for temperature for each independent chamber.
Возможно, разность давлений? или избыточное давление?

[Peter Cantrop]

спроектированы с учётом и без учёта дифдавления
я бы взял
дифференциальное давление

избыточное здесь неверно

[Deadmau5]

перепад давления или как выше уже написали, дифференциальное давление.

[knopka]

Ясно, спасибо!