一、Installation Preparations

1. Model Verification: Confirm that the rubber joint’s model, specification (e.g., nominal diameter, working pressure, temperature resistance), and material (e.g., EPDM, NR, NBR) match the design requirements and medium characteristics (e.g., water, air, acid-base fluids).
2. Visual Inspection: Check for surface defects (e.g., cracks, blisters, uneven rubber layers) or damage to flanges/connectors. Ensure the reinforcing layers (nylon cord, steel wire) are free from exposure or looseness.
3. Pipeline Alignment: Ensure the connected pipelines are coaxial (coaxiality error ≤ ±3mm) and the flanges are parallel (parallelism error ≤ 2mm) to avoid eccentric loading on the rubber joint.
4. Support Check: Verify that fixed supports and guide supports of the pipeline system are installed as per design, with sufficient strength to bear the axial force and lateral displacement of the rubber joint.

二、Installation Procedures

1. Positioning: Install the rubber joint at the pipeline’s vibration isolation point, displacement concentration area (e.g., near pumps, valves), or where thermal expansion needs to be absorbed. Avoid direct sunlight or contact with sharp objects.
2. Connection Methods:
   • Flange Connection: Use standard flanges (e.g., GB, ANSI, JIS) and ensure bolts are symmetrically tightened in a crosswise sequence (e.g., first upper-lower, then left-right) to prevent flange distortion. The torque should be uniform to avoid leakage.
   • Threaded Connection: Apply sealant (e.g., Teflon tape) to the threads and tighten gently to prevent excessive force from damaging the rubber body.
3. Expansion & Contraction Control:
   • Do not stretch or compress the rubber joint beyond its allowable displacement (refer to the manufacturer’s specifications, typically ±5~15mm for axial displacement, ±8~12mm for lateral displacement).
   • For systems with large temperature variations, pre-compress/extend the joint by 1/2 of the calculated displacement during installation (cold tensioning) to optimize compensation efficiency.
4. Avoid Misuse:
   • Never use the rubber joint as a force-bearing component to adjust pipeline misalignment.
   • Prevent media with high solid content (e.g., sand, slag) from flowing through, as it may cause abrasion. For abrasive media, install a strainer upstream.
     
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三、Usage and Maintenance Guidelines

1. Pressure & Temperature Limits: Do not exceed the rated working pressure (e.g., 1.0MPa, 1.6MPa) or temperature range (e.g., -20°C~120°C for EPDM) to avoid rubber aging or rupture.
2. Leakage Inspection: After installation, conduct a pressure test (1.5× rated pressure for 30 minutes) to check flange joints and rubber bodies for leakage.
3. Environmental Protection: If exposed to ozone, oils, or corrosive gases, use protective covers and replace the joint periodically (recommended service life: 3~5 years under normal conditions).
4. Regular Maintenance:
   • Inspect for signs of rubber cracking, bulging, or flange corrosion every 6 months.
   • Tighten loose bolts and replace damaged gaskets promptly.
   • For seasonal shutdowns, drain the pipeline to prevent freeze-thaw damage to the joint.

四、Special Notes for Specific Scenarios

• High-Vibration Systems (e.g., pump outlets): Install additional shock-absorbing supports on both sides of the rubber joint and use reinforced models with steel wire braids.
• Vertical Pipeline Installation: Ensure the joint is supported by a vertical bracket to bear its weight, and avoid using it in systems with significant axial downward forces.
• Chemical Media: Select rubber materials resistant to specific media (e.g., FKM for strong acids, neoprene for oils) and consult the manufacturer for compatibility verification.