St52 concrete pump pipe are made from ST52, and the lowest Capacity of ST52 steel pipe is 8000 cubic metres. And we could add the Wear-resistant electrode in the ST52 steel pipe to expand the working life. specification of ST52 Concrete Pump Pipe St52 DN100X4.5mmX3mXSK100 4-1/2” 85bar St52 DN125X4.5mmX3mXSK125 5-1/2” 85bar St52 DN125X 5.0mmX 3mX SK125 5-1/2”