Does it mean " Pressure Containing castings and Structural Castings" or "Pressure Containing-Structural Castings"?
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closed as not a real question by Kris, Matt E. Эллен♦, jwpat7, aedia λ, simchona♦ May 19 '12 at 0:21
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Without more context it really can't be determined. But my best guess would be that it means the former:
Is this a section heading in a catalog?
The two terms are alternatives.
Pressure containing castings are designed to hold and confine higher pressures within.
Structural castings merely provide the strcture and cannot (be expected to) withstand high pressures.
The reference here is to the two different classes of products -- both of them.