BRUGG Pipesystems is leading the internal digester heating market with its proven BIOFLEX helically corrugated stainless steel pipe. This pipe has been used in over 600 digesters for more than 10 years. The BIOFLEX pipe not only is vastly superior in its rate of heat transfer, but it also installs faster than any other pipe. One of the reasons for the superior heat transfer is the pipe’s helical corrugation, which increases the heat transfer surface by 40% over smooth bore pipe. The BIOFLEX pipe comes “endless” resulting in no pipe connections inside the digester. Each heating circuit has an inlet and outlet fitting on the outside of the tank.