I apologize for using the answer box for this, since this is really a very long comment and barely an answer at all.
If I understand correctly, you're trying to come up with a phrase describing the recommended maintenance and operating conditions of a machine.
(Am I correct in thinking that you want a word which describes both the maintenance conditions and the operating conditions of the machine? By "maintenance condition" I mean things like "the airplane's oil tank should be topped off and the seat belts should be undamaged," and by "operating condition" I mean things like "the airplane should be flown at a maximum speed of 180 knots and should not be flown in clouds.")
The phrase should have a meaning similar to:
- in tip-top condition
- in perfect condition
- in top physical shape
- in a flawless state
- operated in a manner which allows it to achieve its maximum potential
- looking slick and operating smooth
Is my understanding correct so far?
You also have some kind of "extra fact" in mind, which you've described in two different ways:
- "the external environment, and external factors, should not be able to interrupt [the machine's] productivity."
- "The machine should not require shielding [...], it should be in its prime and kept operating in its prime - the outside world shouldn't make a difference."
However, I don't know how this "extra fact" relates to your question. Is this a fact that the phrase you're searching for is supposed to convey? Or is this fact just a piece of information that you're giving us in order to help us answer the question?
I'm particularly confused by your statement that the machine "must be operated in a manner which allows it to achieve its maximum potential" (emphasis added). Are you saying that it's the kind of machine where if it's operated at its maximum potential, then it continues working perfectly, but if it's operated at less than its maximum potential, then that causes it to suffer damage? Or are you saying that the machine is so precious that it must be used for all it's worth, and that failing to achieve its full potential would be a terrible waste?
In any case, I have two suggestions. I'd like to hear whether you think one of these fits or not, and if not, why not:
- The machine must be kept operating at its utmost full potential.
- The machine must be kept operating in full flourish.