land-based drilling rigs are designed to be assembled and disassembled quickly
with minimum impact on the environment. Buildings are insulated to protect
workers and equipment in cold weather. The flag on the crown is also a safety
measure to alert workers to changes in wind direction. The crown is painted red
and lighted at night to warn low-flying aircraft.
Petroleum Communication Foundation. Our Petroleum Challenge: Exploring Canada's Oil and Gas Industry, Sixth Edition. Calgary: Petroleum Communication Foundation, 1999. With permission from the Centre for Energy.