English to Russian Tech/Engineering Paper / Paper Manufacturing soft tissue production

Work at crawl speed (mode) is used as an option for safety locking of a production line in cases when safety locking cannot be done or is not целесообразно. It is used when routine or repeating tasks, such as quality checks, change of base-paper roll etc. are made.
This concerns a soft tissue production line, but I suppose the term is used also in connection with paper production lines.
(Another option for safety locking together with crawl speed mode is "импульсный режим").