Q15: For the shown FEED composition (mole%) in a typical plant producing stabilised crude, what would the first stage separator look like?
(Assume the composition will remain constant over plant life)
A. A vertical 3 phase separator
B. A vertical 2 phase separator
C. A horizontal 3 phase separator with weir
D. A horizontal 3 phase separator with boot
D; 3 phase separation is required, however, with boot as water is present in small quantities and not indicated to increase over time.
Q16: A train leaves City A for City B at 15 mph. At the very same time, a train leaves City B for City A at 20 mph on the same track. At the same moment, a bird leaves the City A train station and flies towards the City B train station at 25 mph. When the bird reaches the train from City B, it immediately reverses direction. It then continues to fly at the same speed towards the train from City A, when it reverses its direction again, and so forth. The bird continues to do this until the trains collide. How far would the bird have traveled in the meantime? Both Cities are in a straight-line and 70 miles away from each other.
The trains are approaching each other at a relative speed of (20 + 15) = 35 mph. The sum of the distances covered by the trains when they collide is 70 miles, the distance between the cities. Since the speed of the bird is constant at 25 mph, we know that the bird would have covered – 25 * (70/35) miles = 50 miles before the trains collide.