Core Maintenance Objectives

Classification and Technical Points of Maintenance Functions

I. Anti-Aging Protection

• Delay Rubber Cracking:
  • UV Protection: Outdoor installations require sunscreen coatings (e.g., neoprene protective layers) and avoid direct exposure to environments with ozone (O₃) concentration >0.02ppm.
  • Temperature Control: Add thermal insulation for temperatures exceeding 120℃ (except silicone rubber); preheat to above 5℃ in low-temperature environments (<-20℃) before startup.
• Medium Compatibility Maintenance:
  • Regularly inspect medium composition: For oily media (NBR rubber), control oil temperature ≤80℃; for acid-alkali media (EPDM rubber), monitor pH within 6-9.

II. Sealing Performance Preservation

• Flange Connection Tightening:
  • Bolt Torque Control: According to GB/T 26121, bolts under 1.6MPa should have a preload of 30-40N·m, tightened symmetrically quarterly to prevent offset leakage.
  • Sealing Surface Cleaning: Remove residual gasket debris during disassembly to avoid metal chips embedding in the rubber seal.
• Lining Inspection:
  • For food-grade pipelines (FDA-certified rubber), perform endoscopic checks semi-annually to prevent medium contamination from lining wear.

III. Displacement Compensation Maintenance

• Dynamic Displacement Monitoring:
  • Axial displacement ≤±10mm (limit devices needed for excess), lateral displacement ≤±5mm; avoid long-term over-range displacement causing corrugation deformation.
  • Vibration Frequency Control: Install dampers for pipeline vibration >50Hz to reduce rubber fatigue (fatigue life cycle ≥10⁵ cycles).
• Support System Co-Maintenance:
  • Fixed support displacement deviation ≤3mm; guide support axial clearance maintained at 2-3mm to prevent extra bending moment on the compensator.

IV. Fault Warning and Preventive Maintenance

• Visual Inspection Items:

  Abnormal Phenomenon	Potential Issue	Maintenance Measures
  Surface cracks	Ozone aging/excessive displacement	Replace rubber element; check installation accuracy
  Local bulging	Excessive medium pressure	Calibrate pressure gauge; install pressure relief valve
  Flange seepage	Damaged sealing surface	Replace gasket; grind flange sealing surface

• Instrument Detection Methods:
  • Ultrasonic thickness measurement: Check rubber wall thickness annually (replace if wear >1mm).
  • Infrared thermography: Monitor operational temperature uniformity (temperature difference >15℃ indicates abnormal local friction).

Industry Maintenance Standards Reference

• Chemical industry: Follow HG/T 2420-2018 Rubber Shock Absorber Maintenance Specifications; pipelines with toxic media require quarterly full inspections.
• Building water supply/drainage: In accordance with GB 50242-2016, rubber joints in fire protection systems should be maintained alongside annual hydrostatic tests.
• Marine industry: Comply with ISO 10133; offshore conditions require monthly anti-salt spray coating (silicone-based protectant).

Special Condition Maintenance Solutions

• High-Temperature Steam Systems:
  • Use silicone rubber (resistant to 150℃) and replace steam-side sealing strips every 2,000 hours.
• Acid-Alkali Waste Pipelines:
  • Flush the lining with deionized water during each shutdown (neutralize if pH deviates from range).
• Food-Grade Pipelines:
  • Disinfect by wiping with 75% ethanol (chlorine-containing disinfectants prohibited to avoid rubber corrosion).