Valves and equipment may be included in the circulation system provided that their materials are resistant to chemical solutions involved and prior approval of the Engineer is obtained.
如果阀门和设备抗化学溶剂腐蚀，在事先得到工程师许可条件下可进入清洗循环系统；
Valves and equipment may be included in the circulation system provided that their materials are resistant to chemical solutions involved and prior approval of the Engineer is obtained.
如果阀门和设备抗化学溶剂腐蚀，在事先得到工程师许可条件下可进入清洗循环系统；
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