Read two documents that will provide and answer the following questions:
1) You will note from reading the above referenced specifications that fewer valve types are recommended for subsea service. Discuss why this is the case?
2) Using the above referenced specifications and included drawings (Drawing 6 inch gate valve, Drawing 10 inch ball Valve operator and Drawing 10 inch ball valve) of subsea valves, compared to topside applications discuss:
a) What additional design features are required for subsea valves and why are they required?
b) Which design features, materials, testing scopes often require modification to suit subsea applications and why are they necessary?
c) Are there any design features that are not desirable to have subsea and are required to be removed, if so why?