This regulation mainly covers the maintenance cycle and content, maintenance and mass standards, commissioning and acceptance, maintenance and fault handling of low temperature vertical multistage centrifugal pumps. It is suitable for the maintenance and overhaul of low temperature vertical multistage centrifugal pumps. Miscellaneous vertical centrifugal pumps can be referred to for implementation when overhauling. The basis for preparation and revision includes relevant national regulations and Sinopec Group related standards. The maintenance cycle is divided into minor repairs and major repairs. Minor repairs include overhauling mechanical sealing and checking bearing and pressure relief bushing clearance.