In the field of mechanical and electrical installation , especially in industrial plants , it usually involves the pipeline installation and construction of various power systems , power systems , water supply systems , etc . Many plants are large - span and high space structures . The span between columns is generally more than 6 meters , and the single - layer space is generally more than 4 meters . Under such a structural mode , the company ' s integrated pipeline bridge finished supports and hangers are selected for the project .