heat tracing的用法和样例：
例句
- This trap is suitable for low temperature accompanying heat line pipe and working condition which needs low temperature to discharge frozen water.
该阀适用于低温伴热管线和需要低温排除凝结水的工况。 - The discharge line shall be heat traced when the PSV handles viscous materials or other materials that can solidify as they cool to ambient temperature.
如果压力安全阀处理粘性介质或其它可能凝固的介质，因介质遇到环境温度会发生凝固，所以排放管线应安装伴热管。
