An increase in pressure is just that. If you want to know exactly how much, feel free to look it up yourself. This pipeline is using the same pipe as any other, but has a higher pressure and increased heat. It also pumps sand, which anybody who has been around equipment knows will sand blast anything it hits. Corrosion problems are bigger and it will in fact break more than regular pipelines due to thicker being harder to pump than thinner. Adding more pumps means more pumps will now break. I made a living fixing machinery, everything breaks at some point. When you add equipment, it only increases the things that break. For some, oil trumps food, drinking water, land rights, and their kids health, for the profits of an industry. Can't even get things done in a correct manor to limit the risk, as oil is your god.