Acoustics . laboratory tests on noise emission from appliances and equipment used in water supply installations . part 3 : mounting and operating conditions for in - line valves and appliances 声学.供水设施使用的器械和设备发出噪音的试验室试验.第3部分:嵌入式阀门和器械的安装和操作条件
Acoustics . laboratory tests on noise emission from appliances and equipment used in water supply installations . part 2 : mounting and operating conditions for draw - off taps and mixing valves 声学.供水设施使用的器械和设备发出噪音的试验室试验.第2部分:排水龙头和混合阀门的安装和操作条件
In this article , through lab and engineering site trials that the physical data of new type pipe materials is corrected , the results are as follow : ( l ) the expansion coefficient of new plastic pipe materials is more large than that of iron pipe . ( 2 ) new plastic pipe materials have different heat - resisting character and according to the water temperature to choose pipe materials ; ( 3 ) the loss of head of water for new type pipe materials is more smaller than iron pipe and also correct the loss of head of water that calculated by theory ; ( 4 ) probing into the press - resistance character of new plastic pipe materials 本文通过试验室试验及工程现场试验，对新型给排水管材的几个重要的物理性能参数进行实验测定，纠正了以往的错误认识。研究结果表明： ( 1 )新型塑料管材线胀系数远远大于钢管和铸铁管，设计和施工中要严格考虑管道的伸缩； ( 2 )新型塑料管材耐高温性能各不相同，需根据管内水温选定管材； ( 3 )新型管材水头损失远小于钢管，并对原水头损失计算公式进行了修正； ( 4 )对于塑料管材的耐压性能进行了探讨。
