If gravity is not utilized from the trap to the return pipe, the trap and drain must be drained manually or automatically using a drain with antifreeze. In addition, when multiple traps are installed in the same trap station, maintaining warmth around the trap can help prevent freezing. Proper selection and installation of a suitable trap can effectively avoid freezing issues as long as steam flows through it. However, if the steam supply is interrupted, condensate may create a vacuum in the heat exchanger or associated piping, which can hinder the free flow of condensate and lead to freezing. To prevent this, a vacuum breaker is typically installed between the discharge equipment and the trap.
A preliminary summary of the first valve:
If gravity is not used from the trap to the return pipe, the trap and drain should be drained manually or automatically using a drain with antifreeze. Also, when multiple traps are installed together in the trap station, keeping the trap warm can prevent freezing. Selecting and installing a suitable trap will not cause freezing problems as long as steam passes through it. However, if the steam is broken, the steam condensate will create a vacuum in the heat exchanger or the associated pipe. This will prevent condensate from escaping freely from the system before freezing occurs. Therefore, a vacuum breaker is installed between the discharged equipment and the trap.
Specific antifreeze measures include:
1. The trap size should not be excessively large.
2. Keep the trap discharge line as short as possible to reduce the risk of blockage.
3. Tilt the discharge line downward to assist gravity in draining condensate quickly.
4. Insulate both the trap discharge line and the condensate return line to maintain temperature.
5. If the condensate return line is exposed to atmospheric conditions, consider using a heat pipe for insulation.
6. When the return pipe rises, install a vertical discharge pipe near the top of the return header, and insulate it along with the trap discharge pipe.
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