Q31: In separation scheme I, separator 1 operates at 50 barg and separator 2 at 25 barg; if the operating pressure in separator 1 were to increase to 60 barg while separator 2 keeps operating at 25 barg, which of the following you would agree with for the given FEED composition:
A. Stock tank liquid will have higher vapour pressure now
B. Stock tank liquid will have lower vapour pressure now
C. No impact on the stock tank liquid vapour pressure
D. Impact of stock tank liquid can not be predicted
A; When the pressure in 1st separator is increased, more light end components that were otherwise flashing into G1 at 50 barg would get dissolved into L1. This will give rise to increase in partial pressure of these components in 2nd Stage Separator, restricting some of the light end components that were otherwise flashing to G2 from incoming feed L2@50 barg. Similarly, more light ends compared to F1@50barg scenario will end up in the Stock Tank for F1@60 barg scenario, and therefore, would result in a higher vapour pressure.
Q32.There are three containers; container I (3 Liter), container II (5 Liter), container III (8 Liter). Container III is filled with 8L of water while the other two are empty. With the help of these 3 containers, how to distribute the water in equal volumes i.e. 4L in container II and, 4L in container III. Consider there is no loss of water when transferring it from one container to another.
Step 1: Pour water from an 8L to 3L container. Water in the 8L container is now 5L and the 3L container is now full.
Step 2: Pour water from 3L container to 5L container. Water in the 5L container is now 3L and the 3L container is now empty.
Step 3: Pour water from 8L container to 3L container. Water now in the 8L container is 2L and the 3L container is full.
Step 4: Pour water from a 3L to 5L container. The 5L container is now full and the water in the 3L container is now 1L.
Step 5: Pour water from 5L container to 8L container. The water in the 8L container is now 7L and the 5L container is now empty.
Step 6: Pour water from the 3L container into the 5L container. The 3L container is now empty and the water in the 5L container is 1L.
Step 7: Pour water from the 8L container into the 3L container. The water in the 3L container is now 3L and the water in the 8L container is 4L.
Step 8: Pour water from the 3L container into the 5L container. The 3L container is now empty and the water in the 5L container is now 4L.