The two merits are:-
1)It is easy to transport
2)their is no delay due to climatic condition
 merits of pipeline are that 
They are ideally suited to transport the liquids and gases
.2. Pipelines can be laid through difficult terrains as well as under water.
3. It involves very low energy consumption.
4. It needs very little maintenance
.5. Pipelines arc safe, accident-free and environmental friendly.

demerits of pipeline 
 It is not flexible, i.e., it can be used only for a few fixed points.
2. Its capacity cannot be increased once it is laid.
3. It is difficult to make security arrangements for pipelines.
4. Underground pipelines cannot be easily repaired and detection of leakage is also difficult.