Maintenance of spring hangers is critical to ensuring the long-term, stable operation of piping systems. Detailed maintenance instructions are provided below:
Regular Inspections:
Frequency: A comprehensive inspection is recommended every 3-6 months. The frequency can be adjusted based on the operating environment (e.g., high temperature, corrosive environments).
Inspection Details:
Spring Appearance: Inspect for cracks, deformation, or rust.
Connectors: Ensure that bolts and nuts are not loose or missing, and that the torque value meets the design requirements (typically 50-100 N·m).
Working Height: Measure the spring compression. If it deviates by more than ±10% from the design value, adjust or replace it.
Cleaning and Lubrication:
Cleaning: Use a soft brush or compressed air to remove dust and oil from the surface. In corrosive environments, use a rust inhibitor (such as WD-40).
Lubrication: Apply high-temperature lithium-based grease (such as Shell Gadus S2 V220) to moving parts, such as pins and joints, every 6 months. Avoid using conventional motor oil to prevent carbon deposits.
Adjustment and Repair:
Load Adjustment: Change the spring pre-compression by adjusting the nut to ensure that the load variation during pipe displacement is within ±5%.
Component Replacement: Immediately replace any spring with permanent deformation exceeding 10% of the free height or connector wear exceeding 5% of its original size.
Records and Archiving:
Record detailed data from each inspection (such as load value, compression, and lubrication time). It is recommended to use a digital management system (such as the SAP PM module) to track historical data.
Maintenance for Special Environments:
High-temperature environments (>200°C): Use high-temperature-resistant alloy springs (such as Inconel 718) and shorten the inspection cycle to two months.
Corrosive environments: Galvanized or epoxy-coated supports and hangers are recommended, along with cathodic protection.
