Fig : Direct line system
Ring main system
Advantage:
- In this system any tank can be discharged by any pump. Thus different grade of the cargo can be loaded.
Disadvantage:
- It is expensive to build due to the extra length of the piping required.
- Extra bend is required. Thus decreasing in rate.
- Risk of leakage from radius of bend exists.
Fig : Ring main system
Free flow system
Advantage:
- Main pipe line is not used for discharge.
- Less pipe line.
- Less bend.
- Less friction & more pressure cause very high discharge.
Disadvantage:
- Is not flexible.
- One grade is dischargeable if more risk of contamination exists.
- Risk of overflow exists if level of all tank doses not carefully monitoring.
Fig: Free flow system
