Your post is a little short on details and I'm not really sure what you mean by "maximum efficiency". Do you mean efficiency of power/energy, space or what? If this is addition or replacement of the original plant steam supply, then you need to make your supply as equal as possible in terms of pressure, temperature and steam quality. You must have some idea of what you want to do and it's normally better on this site to say "I propose to do this...." and explain in figures and diagrams and then ask for comments.
All your safety and trip functions must work in parallel with the existing and the whole thing loked at in terms of high / low pressure, temperature, flow and how the thing starts and stops, is isolated from each other and any combination of events which could mean one system affecting the other.
all a bit vague, but it's quite a vague question you ask....
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way