By analyzing three fire - fighting circuit piping system, and comparing some standard, it can get advantages and disadvantages, and introduce the design of fire-fighting pumppiping system.
The pump and piping are designed to be kept full of water. But they tend to leak and develop alternating pockets of air and water, Mr. Friedlander said.
水泵和管道在设计上是应该充满水的。弗里德兰德先生说，但是它们发生了泄漏，变成了水气混合的状况。
3
The pump and piping are designed to be kept full of water.