This notice proposes to amend the pipeline design regulations in Part 192 and Part 195 by increasing to 900 F the temperature limit to which cold expanded steel pipe maybe heated (other than by welding) without a 25 percent reduction in design pressure as normally calculated under § 192105 for gas pipelines and § 192.106 for liquid pipelines. The existing temperature limit is 6000 F and temperatures above 8000 F for up to I hour are needed for removal of material defects called "hard spots" by heat tempering. Research shows that temperatures up to 9000 F can be applied for up to 1 hour without adversely, affecting safety.