1. Select the appropriate sealing ring when ordering the groove parts. Different media in the pipeline require sealing rings of different materials. At present, there are eight sealing rings of different materials on the market to apply different media.

2. Pipe groove (also called rolling groove) is the key process of pipe connection, and it also determines the important link of the connection quality of groove parts. The width and depth dimensions of the groove must meet the requirements. In the rolling groove, the end of the nozzle should be flat, no burr, the port should be perpendicular to the pipe axis, so that the rolled groove and the pipe center axis can be perpendicular, at the same time to ensure that the length of the groove to the pipe end to be equal. If the ovality of the pipeline and the wall thickness of the welded galvanized pipe are uneven, they should be corrected as much as possible in the rolling groove, otherwise the groove will produce uneven depth and cannot guarantee their tightness.

3. For groove connection of seamless steel pipes, products that have been galvanized by regular manufacturers shall be selected. If seamless steel pipes are purchased and then galvanized outside, due to oxidation and corrosion caused by long-term storage of steel pipes, the quality of galvanized steel cannot be guaranteed, the adhesion of galvanized steel layer is poor, and the galvanized steel layer is easy to crack or even fall off during groove rolling, thus affecting the sealing and service life. In order to achieve good sealing performance after pipeline installation, in addition to selecting groove parts with good performance and ensuring that the sealing ring is not damaged, the flange and outer edge of the sealing ring need to be coated with neutral lubricant during installation to ensure that the lip of the sealing ring and the sealing ring of the pipeline fit more closely.

4. The use of rigid joints and flexible joints in the groove parts should be reasonable. Rigid joints are suitable for pipe ends that need rigid connections in low-pressure pipelines, such as spray risers, long-distance linear pipelines, valves, equipment, etc. They are required to be used in occasions where the pipeline does not allow displacement, rotation and torsion to obtain Good rigidity. The flexible joint is suitable for connecting medium and low pressure pipelines. After installation, the pipeline is allowed to shrink and deflect appropriately to compensate for the trace displacement of the pipeline. It is more suitable for pipeline installation in uneven environment. It can also absorb noise and vibration and absorb seismic stress. It is generally applied to the inlet and outlet pipes of water pumps in fire fighting systems.

5. If the distance of the fire fighting horizontal pipe is long, when using the hanger, in order to suppress and prevent the pipe from channeling, it is recommended to use flexible joints in the middle part to ensure that the axial channeling pipe is not large, so as not to affect the bending of the horizontal branch pipe connected with it.

6. When installing fire-fighting pipelines in occasions with certain temperature difference, when using fixed supports and anti-sway supports for pipelines, flexible joints and rigid joints can be used in combination, so that the axial force generated by pressure or temperature difference changes will not affect the bending of transverse branch pipes.