Tolerances for crane runways - STN ISO 12488-1:2010
The construction tolerances amount by which a specific dimension is permitted to vary, resulting from the assembly of the complete crane
and its tracks, in new, modified, rebuilt or repaired buildings, before operational use. This applies to new build or repaired or modified cranes and tracks.
The operational tolerances amount by which a specific dimension is permitted to vary, resulting from the use of the crane and its tracks.
Tolerance class 1 - applies to the total travelling distance by the crane during its service life above 50 000 km
Tolerance class 2 - applies to the total travelling distance by the crane during its service life in the range from 10,000 km (including) to 50,000 km
Tolerance class 3 - applies to the total travelling distance by the crane during its service life to 10 000 km
Construction tolerances for travelling tracks of tolerance classes 1 to 3 according to STN ISO 12488-1:2010
| Symbol | Description | Picture | Tolerance Class 1 | Tolerance Class 2 | Tolerance Class 3 |
| A | Tolerance of span S of S <= 16m | ± 3 | ± 5 | ± 8 | |
| A | Tolerance of span S of S > 16m | ± [3 + 0,25 * (S-16)] max. ± 10 | ± [5 + 0,25 * (S-16)] max. ± 15 | ± [8 + 0,25 * (S-16)] max. ± 20 | |
| B | Tolerance of horizontal straightness of rail head at each point of travelling track | ± 5 | ± 10 | ± 20 | |
| b | Tolerance of horizontal straightness related to test length of 2 000 mm (sample value) at each point of rail head | 1 | 1 | 2 | |
| C | Tolerance of straightness related to height of crane rail centre at each point of travelling track | ± 5 | ± 10 | ± 20 | |
| c | Tolerance of straightness related to test length of 2 000 mm (sample value) at each point of height of crane rail | 1 | 2 | 4 | |
| E | Tolerance of height related to opposite measuring points at right angles at each point of travelling track | ± 0,5 * S, kde S [m] max. ± 5 | ± S, kde S [m] max. ± 10 | ± 1,25 * S, kde S [m] max. ± 20 | |
| ±Fmax | Tolerance of parallelism of end stops or buffers on travelling track at right angles to longitudinal axis with parallelism symbol // | ± 0,8 * S, kde S [m] max. ± 8 | ± S, kde S [m] max. ± 10 | ± 1,25 * S, kde S [m] max. ± 12,5 | |
| G | Tolerance of angularity related to crane rail cross-section at each point of travelling track with angularity symbol < | 4 | 6 | 9 | |
| K | Tolerance of parallelism of crane rail to web at each point of travelling track tmin - smallest thickness of web | ± 0,5 * tmin | ± 0,5 * tmin | ± 0,5 * tmin |
Operational tolerances for travel tracks of tolerances classes 1 to 3 according to STN ISO 12488-1:2010
| Symbol | Description | Picture | Tolerance Class 1 | Tolerance Class 2 | Tolerance Class 3 |
| Aw1 | Tolerance of span S of crane rails related to rail centre at each point of travelling track S <= 16m | max. ± 10 | max. ± 16 | max. ± 25 | |
| Aw1 | Tolerance of span S of crane rails related to rail centre at each point of travelling track S > 16m | ± [10 + 0,25 * (S-16)] | ± [16 + 0,25 * (S-16)] | ± [25 + 0,25 * (S-16)] | |
| Bw1 | Tolerance of horizontal straightness of rail head at each point of travelling track | max. ± 10 | max. ± 20 | max. ± 40 | |
| Ew1 | Tolerance of height related to opposite measuring points at right angles at each point of travelling track | max. ± 10 | max. ± 20 | max. ± 40 |