Expansion joint installation specifications and standards involve many aspects. The following is what we have sorted out for your reference:
I. Preparation before installation
Inspection and Acceptance：
The expansion joint shall be strictly accepted before installation to ensure that the product certificate, instruction manual and other documents are complete.
Check the model, specification and pipe configuration of the expansion joint, which must meet the design requirements.
Selection and Calculation：
Select the appropriate expansion joint to ensure the size, material, and design meet the temperature range, pressure, and displacement requirements of the piping system.
Precisely calculate the expected thermal expansion and contraction displacement or amount of expansion of the piping system to determine the desired expansion joint size.
Transportation and Protection：
The expansion joint shall be provided with a cart to maintain its fixed length during transportation and installation.
Before installation, the expansion joint should be inspected for any damage during transportation, ensuring that the appearance and structure are complete.
II. Installation process
Positioning & Support：
Expansion joints must be properly supported and positioned to ensure that they are in place in the piping system and allow for free expansion, contraction or displacement.
The support points should be strong and reliable and do not restrict the movement of the expansion joint.
Direction and Connection：
For expansion joints with inner sleeves, care should be taken to make the direction of inner sleeves consistent with the direction of media flow.
The hinge rotation plane of the hinge expansion joint shall be consistent with the displacement rotation plane.
Ensure that the dimensions between the external connection end faces of the expansion joint meet the requirements, and the connection Connect tightly without leakage.
Pre-deformation and cold compaction：
For expansion joints that need to be "cold tightened", the auxiliary components used for pre-deformation should be removed only after the pipeline is installed.
It is strictly prohibited to use the deformation method of corrugated expansion joint to adjust the installation overtolerance of pipeline, so as to avoid affecting the normal function of expansion joint, reducing the service life and increasing the load of pipe system, equipment and supporting members.
Welding and Protection：
During the installation process, no welding slag is allowed to splash onto the surface of the wave shell, and no other mechanical damage is allowed to the wave shell.
When welding pipe supports and brackets, spot welding and dummy welding should not be used to ensure the welding quality.
Safety and Environment：
Applicable safety standards must be observed during installation to protect the safety of workers and the plumbing system.
Pay attention to the influence of the environment on the expansion joint, such as temperature, humidity, etc., and take protective measures if necessary.
3. Post-installation inspection and debugging
Removing auxiliary components：
After the pipe system is installed, the yellow auxiliary positioning members and fasteners used for installation and transportation on the corrugated expansion joint should be removed as soon as possible.
Adjust the limit device to the specified position according to the design requirements, so that the pipe system has sufficient compensation ability under environmental conditions.
Maintenance and Monitoring：
Check the condition of the expansion joint regularly to ensure its good operation.
If damage or wear is found, the expansion joint should be replaced in time.
Other matters to be noted
Ensure that the material of the expansion joint is compatible with the media in the piping system to prevent material damage or degradation.
For special media or working conditions, the corresponding expansion joints of special materials or structures should be selected.
Follow the manufacturer's installation guidelines and recommendations to ensure proper installation and use of the expansion joint.
In short, the installation specifications of expansion joints cover many aspects such as preparation before installation, precautions during installation, inspection and commissioning after installation, etc. Strict adherence to these specification standards can ensure the proper function and long-term stable operation of expansion joints.