D. Systems should not be located close to flammable liquid piping or piping of other flammable gases.
系统不能接近可燃液体管道或其它可燃气体管道。
On gas withdrawal systems, use a check valve or other protective apparatus in any line or piping from the container to prevent reverse flow.
对于气体排出系统，使用止回阀或其它保护性装置以防止回流。
The expansion joint is a new type of device used for compensating the thermal expansion or other movements of piping systems.
波纹膨胀节是用于补偿管道的热膨胀及各种位移的新型补偿元件。
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