Passive voice

Hi
What is the structure of "used to be designed " in the following sentence?

According to main steam pressure the thickness of casing used to be designed.

Comments

  • I can't help you, @AliNateghi, because the sentence as it stands is incomplete.

    Perhaps there are some key words missing from the end.
    Or perhaps the sentence is a translation using one of more inappropriate English words.

  • Thanks

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