The problem is not the English, is the lack of engineering capacity to formulate a proper question. This still could be a lack of proper English or worst, the lack of understanding of the structures blast protection. Either way, the question as formulated looks like a stab in the dark, hoping that someone will give them something to run with. Many people in this forum are willing to reach out with a helping hand, sometimes the first help being the request to re-formulate the question in a clear engineering form.
To clarify the question, please be advised that a piece of plate cannot offer any blast protection to anything and anyone. The blast may be translated as a pressure affecting a given area of a structure, like a housing for a hydraulic unit. Details are required for the blast pressure, the size, shape, orientation of the housing, etc.., in order to enable the helper to provide a proper engineering advice.
Best regards,
gr2vessels