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To effectively enhance the transportation capacity of compressed air foam and better address the fire hazards in converter stations，experimental research was conducted on pressure distribution using full-scale compressed air foam transport pipelines of 699，406 and 261 m as examples. Furthermore，the equivalent resistance length method was proposed to consider static pressure loss and local pressure loss，and a comprehensive equivalent resistance coefficient was introduced. An empirical pressure loss relationship suitable for engineering applications was developed. The results indicate that during the compressed air foam transport phase，the pipeline inlet and outlet pressures rapidly increase with time before stabilizing. The time required to reach a steady state is proportional to the length and complexity of the pipeline. After foam transport ceases，the pressure within the pipeline drops sharply. The complexity of the pipeline configuration leads to a nonlinear decrease in local pressure with increasing transport distance. Finally，an empirical relationship between the pressure loss and the equivalent resistance length has been obtained，which can be used to predict pressure drop variations for pipe diameters ranging from DN50 to DN200 and pipeline lengths up to 1 000 m.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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