Handling Water Accumulation Inside Insulated Steel Pipes During Winter Heating Shutdowns

Handling Water Accumulation Inside Insulated Steel Pipes During Winter Heating Shutdowns

1. Importance of Draining Water

• Water inside insulated steel pipes can freeze during cold weather, causing internal pipe damage such as cracking or bursting due to ice expansion.

• Accumulated water also promotes corrosion inside the pipe, shortening its service life.

2. Drainage Procedures

• Before the heating system is shut down for winter, fully drain all water from the pipeline system.

• Open drain valves at low points and use blow-out equipment if necessary to remove trapped water.

• Ensure any dead-end sections or low spots where water may collect are thoroughly emptied.

3. Drying the Pipeline

• After draining, apply compressed air to blow out residual moisture inside the pipes if possible.

• Some systems use nitrogen purging to dry the pipeline and prevent moisture-related corrosion.

4. Protective Measures During Shutdown

• Maintain the pipeline at a slight positive pressure using dry inert gas if complete draining is not feasible.

• Inspect and repair insulation and jackets to prevent external moisture ingress.

5. Inspection Before Restart

• Before resuming operation after winter, inspect pipes and insulation for signs of freezing damage or corrosion.

• Repair or replace damaged sections to ensure system integrity.

Summary

To prevent freezing damage and corrosion during winter heating shutdowns, it is essential to completely drain water from insulated steel pipes, dry the system thoroughly, and take protective measures like inert gas purging if needed. Proper preparation helps maintain pipeline safety and longevity.