CALGARY/WASHINGTON (Reuters) – The U.S. pipeline regulator raised the pressure on Enbridge Inc on Thursday over the latest spill on its U.S. oil pipeline network, demanding that it submit a plan to improve the safety of the entire 1,900 mile system before restarting a key Midwest line.

The U.S. Pipeline and Hazardous Materials Safety Administration said it added new conditions to this week’s corrective action order for the restart of Line 14 to address failures on that pipeline as well as a string of others in recent years on its U.S. system, part of the world’s longest network for moving oil and petroleum products.

CALGARY, Alberta, Aug 2 (Reuters) – Enbridge Inc
still does not know when it can restart a key U.S. oil pipeline
after a leak last week that irked regulators, but executives
insisted its quick response to the incident showed that safety
improvements implemented after a devastating 2010 spill in
Michigan are working.

Enbridge, which reported a 7 percent increase in adjusted
second-quarter profit, is under growing pressure from the
public, its oil-shipping customers and now investors to show
improvements in its safety record following last Friday’s leak
of its Line 14 in rural Wisconsin.

CALGARY, Alberta, Aug 1 (Reuters) – Canada’s National Energy
Board plans to subject Enbridge Inc to a series of
safety audits in the coming months to make sure its pipeline
control-room procedures, assailed last month by U.S. regulators,
are up to acceptable standards, the board’s chairman said on
Wednesday.

In an open letter on the National Energy Board website,
Chairman Gaetan Caron said Canada’s main oil and gas regulator
has reviewed the synopsis of the U.S. National Transportation
Safety Board’s report on Enbridge’s 2010 oil spill in Michigan,
the most damaging of several in recent years.