... blocking device, centering machine, machine bracket, machine support, main oil cylinder, floating pressure head, pulling rod, sealing head, lifting machine, water supplying system, ... (1)The testing pressure of the hydraulic pressure machine Diameter (DN)Testing pressure MPa K8≥K9100-3004. ... the pipe onto the synchro lifting machine.4. Start the synchro lifting machine oil cylinder to uplift the pipes, ...