C. Use studs instead of conventional bolts. 12. Which process does not introduce

Question

C. Use studs instead of conventional bolts. 12. Which process does not introduce compressi surface stresses? A. Roller burnishing B. Thread cutting C. Thread rolling D. Hole expansion E. Shot peening D. Use short, stiff, large-diameter bolts. E. Loosen the bolts. 6. Why is compressed water used instead of gas or steam to test pressure vessels? A. Compressed water stores less energy tharn compressed gas or steam. B. Compressed water does not cause corrosion. C. Compressed water does not cause fracture D. Water is denser than gas or steam. E. Water is more compressible than steam.

Explanation / Answer

Ans 6 : D) Water is denser than gas or steam

The compressed water is used to test the pressure vessels since it is cheaper and do not cause harm to the pressure system tested.

If gas or steam was used for testing , any failure or leak in the system may cause a large amount of gas/steam to be released according to V = (nRT)/p , whereas water if leaked would not cause much harm since it will be a little quantity as it much denser than steam/gas.

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