600kN/1000KN/1500Kn/2000kN Electronic Hydraulic Servo Manhole Cover Compression Testing Machine(CE CUL/CSA EN124/EN1433)

test for cast iron manhole cover residual deformation: before loading, record nominal deforamtion of geometric center of manhole cover, accuracy of measurement is 0.1mm, loading at speed of 1kN/s – 5kN/s, until 2/3 of test loading, and then repeat for 5 times, record last deformation of geometric center after 30s of completement of loading for 5 times, residual deformation is last value after 5 loading minus nominal value.