1.   And if their wells were stopped, the pipeline would have to pay the costs.

2.   Because of the cost of construction, natural gas pipelines usually have few competitors.

3.   Even without such election-year complications, the Tengiz pipeline has had a long and tangled history.

4.   Federal law requires that pipelines have such a system, known as cathodic protection.

5.   Federal regulations do not require pipelines to have leak detection.

6.   Natural gas pipelines usually have few competitors because of the cost of construction,.

7.   The pipeline would have to satisfy environmental concerns, the spokesman said.

8.   The problem, they say, is that hazardous liquid pipelines have the thinnest wall requirements of any major piping code.

9.   The Russian pipeline would have to be refurbished to make way for crude oil from the Caspian and new pumping stations would have to be installed.

10.   The Tengiz pipeline has a tangled history.