... . Concept The ductile iron pipes shall be tested under hydraulic pressure according to ISO2531-2003(E) and GB/T13295- ... machine bracket, machine support, main oil cylinder, floating pressure head, pulling rod, sealing head, lifting machine, water supplying system, hydraulic system ... of the equipment (1)The testing pressure of the hydraulic pressure machine Diameter (DN)Testing pressure MPa K8≥K9100- ...