To accelerate the manufacturing progress of penstock in pumped- storage power station

through testing and demonstration

two high-strength steel plates with a length of 8 meters for one sec⁃ tion of steel pipe with a diameter of 5 meters were replaced by one steel plate with a length of 16 meters. During the manufacturing process

quality control in plate blanking

groove preparation

rolling

assem ⁃ bly and rounding

and welding was strengthened to expand the scope of the integral rolling of high strength steel penstock. Reducing the processing and welding of one longitudinal joint in integral rolling is beneficial to ensure the manufacture quality

save the labor and material

shorten the construction pe ⁃ riod

and alleviate the production pressure of construction peak period.