Diagram (H)  

A rating concerning the resistance to overloads while operating is assigned to the metal structures by the letters from H1 to H4.
Many manufacturers have a rating H1, while our cranes comply with a rating H2, which is much better because:

  Diagram (B)

A rating is assigned to the metal structures which must last for a long time (such as bridges, cranes, etc.) depending on the requirements they can meet.
As far as cranes are concerned, the DIN 15018 norm assigns a range from B1 to B7.
The truck cranes must comply with a min. rating B2, while our cranes comply with a rating B3, which is much better because:

if you stay within the curve H1 with an operating speed of 30 m/min, for instance, you will have an overload capacity of 15%

if you stay within the curve B2, for instance with a definite load S1, you will have a structural life of 200.000 conventional cycles, corresponding to about 100 loading/unloading operations per day for 10 years

if you stay within the curve H2 considering the same speed, you will have an overload capacity of 30%, i.e. double than the above one.

if you stay within the curve B3 with the same load S1, you will have a structural life of 600.000 conventional cycles, i.e. three times bigger.