Is it illegal to repair fire pipes with glue in residential property?

Illegal. Fire pipeline is an important safety facility, and its use and maintenance must comply with relevant laws, regulations and standards. The maintenance and reconstruction of fire pipelines shall be carried out by qualified construction units in accordance with the requirements of fire technical standards to avoid potential safety hazards. The maintenance and repair of fire control facilities, property management companies must be carried out in accordance with the requirements of laws, regulations and management protocols, and ensure the legitimacy and quality of construction units and materials.