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May 15, 2023, 1:17 a.m. PDT
registered for challenge
Nov. 23, 2021, 3:29 a.m. PST
created a new topic to Number of layers/Pipes weight
Nov. 16, 2021, 4:15 a.m. PST
created a new topic to Concrete coating on pipeline
Nov. 10, 2021, 2:43 a.m. PST
registered for challenge
Feb. 10, 2021, 11:18 a.m. PST
replied a new topic to Congratulations to the winners!