lenaitch
Senior Member
Natural gas is terrestrially transported as a compressed gas. Pressures depend on the line, but generally at pressures between 500 and 1500psi. It doesn't evaporate because it is already a gas, but will disperse because it is lighter than air. One problem may be the cause of a breach because it is flammable:Oil spills? We are talking about LNG - Liquefied Natural Gas. LNG spills rapidly evaporate into the atmosphere, so I don't see the threat of remote oil spills.
Gas is liquified by deep cooling (about -160*C) for storage or marine transport at virtually no pressure. The gaseous/liquid volume comparison is about 1/600.
If people think beyond 'pipeline = bad', I imagine there would be a lot less opposition to transporting NG vs liquid petroleum.