The installation of non-metallic expansion joints is a process that requires meticulous handling to ensure their proper functioning and extended service life. Here are some basic installation steps and considerations:
Preparation before installation
Check specifications: Verify that the specifications, dimensions, materials, etc. of the non-metallic expansion joint match the pipeline system.
On-site inspection: Check that the installation location is clean and free of foreign objects and sharp objects to avoid damaging the skin.
Read the instructions: Read the installation instructions provided by the manufacturer carefully to understand the special requirements of specific products.
Installation Steps
Positioning: Place non-metallic expansion joints in predetermined positions according to drawings or instructions.
alignment: Make sure the expansion joint is aligned with the axis of the pipe or equipment to avoid twisting or overstretching.
Connection: Connect non-metallic expansion joints and pipes using flanges, welds, or fixtures.
For flange connection, the expansion joint is pre-assembled with the flange, and then connected with the pipeline.
When welding, protect the skin from heat and avoid direct contact with flame or weld slag.
Adjust the pull rod: Adjust the pull rod on the expansion joint to ensure that the expansion joint is in a natural state and avoid preloading.
Loosen the inner nut: When the installation is complete, loosen the inner nut of the expansion joint, but keep the tie rod to prevent external force from stretching.
Precautions
Avoid external forces: Ensure that the expansion joint is not subjected to external force or tension during installation, so as to avoid deformation in the natural state.
Temperature and Medium: Considering the operating temperature and media characteristics, choose the appropriate skin material.
Reserved displacement: According to the compensation ability of the expansion joint, reserve enough displacement space.
Protective skin: Avoid damage to the skin during installation, such as using a protective cover or cover plate.
Check the seal: Make sure all connections are well sealed to avoid leakage.
guide bracket: Install guide brackets as needed to guide the displacement direction of the expansion joint.
Direction of guide tube: If the expansion joint is equipped with a guide tube, ensure that it flows in the same direction as the medium.
Installation Marking: Make marks during the installation process to facilitate subsequent inspection and maintenance.
Next Steps
Inspection and testing: Carry out a full inspection after installation and pressure test if necessary to ensure that the system is free of leakage.
record: Record installation details including date, location, operator, etc. for future reference.
Maintenance
Periodic inspection: Check the condition of the expansion joints regularly, especially the skin for wear or cracks.
Cleaning: Keep the area around the expansion joint clean to avoid the accumulation of dust and impurities.
Replace: When it is found that the skin is damaged or has reached its service life, replace it in time.
Proper installation and maintenance of non-metallic expansion joints is essential to ensure their proper operation and extended service life. During installation, the installation instructions and relevant safety specifications shall be strictly followed.