Question 300Steam Plants - 1st Asst/Chief70% to pass
The maximum lube oil temperature leaving a large, main propulsion steam turbine bearing should _______________.
AI Explanation
The correct answer is B) never exceed 170°F.
The maximum lube oil temperature leaving a large, main propulsion steam turbine bearing should never exceed 170°F. This is a general industry standard and recommended practice to ensure proper lubrication and prevent damage to the turbine bearing. Exceeding this temperature limit could lead to accelerated wear, increased viscosity, and potential failure of the lubrication system.
The other options are incorrect because: A) there is no universal limit of 70°F above the inlet temperature, C) 130°F is too low and may not provide adequate lubrication, and D) the lube oil outlet temperature from the centrifugal purifier is not the limiting factor for the turbine bearing temperature.
Related Questions
#298 Which of the following statements about gravity type lube oil systems is correct? #299 Oil supply pressure to the main lube oil header of a gravity feed lube oil system is _______________.#301 Which of the following statements is true concerning the turbine shown in the illustration? Illustration SE-0016 #302 The astern element of a main propulsion turbine is usually designed as a/an _______________.#303 The most practical method of determining the condition of a shaft bearing while the shaft is in operation is to _______________.