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AFT SEAL LEAK TEST IS DONE DURING DRY DOCK. FOLLOWING PROCEDURE IS CARRIED OUT TO CHECK WHETHER THE SEAL IS LEAKING OR NOT:-

1.  DRAIN ALL THE OIL OF THE SYSTEM.
2. OPEN UPPER PLUG AND DRAIN PLUG BETWEEN 1&2 TO CHECK WHETHER ANY WATER COMES OUT OF THE DRAIN. IF WATER COMES THAT MEANS SEAL 1 IS LEAKING. IF NOT THAT MEANS SEAL 1 IS OK.
3. TAKE OUT THE UPPER PLUG BETWEEN 2&3. NOW PUT OIL BETWEEN 2 &3.
4. IF OIL COMES FROM DRAIN BETWEEN 1 AND 2 THAT MEANS SEAL 2 IS LEAKING. IF NOT THEN SEAL 2 IS OK.
5.  NOW CLOSE DRAIN BETWEEN 1 &2 AND OPEN DRAIN BETWEEN 2&3.
6. OPEN THE SYSTEM OIL AND CHECK IF OIL IS COMING FROM DRAIN BETWEEN 2 AND 3. IF NOT THEN SEAL 3 IS OK.