被称为井架的永久性的塔，过去是为处理长距离钻探管道而建的。
Permanent towers, called derricks, used to be built to handle the long sections of drilling pipe.
永久性安装的管道应当有相宜的标识。
Permanently installed pipework should be appropriately identified.
同样输送速度一定，混合此高至使粉尘物料在管道底部形成永久性沉淀层时，这时的混合比即为临界混合比。
Likewise, permanent sediment layers are formed with the fixed conveying speed and a certain higher degree of mixing ratio which called as Critical mixing ratio.
中间体或原料药生产过程中使用的主要设备(如反应釜、贮存容器)和永久性安装的工艺管道，应当作适当的识别标志。
Major equipment (e. g. reactors storage containers) and permanently installed processing lines used during the production of an intermediate or API should be appropriately identified.
这类鞍形管卡的优点是可对管道泄漏点进行永久性修理，把钢板和管子焊接，然后拆走螺栓部分。
An advantage of this type of saddle clamp was that permanent repair could be made by welding the steel piece to the pipe and then removing the bolted portions.
因此，这种TrueUnion结构使得人们可以用新的阀腔更换肮脏的阀门，新旧管接螺母能够互相配合，好像永久性连接着邻近的管道上。
Thus, the True union design permits the replacement of a fouled valve with a new body cartridge, which will fit the old union nuts that are likely to be permanently attached to adjacent piping.
因此，这种TrueUnion结构使得人们可以用新的阀腔更换肮脏的阀门，新旧管接螺母能够互相配合，好像永久性连接着邻近的管道上。
Thus, the True union design permits the replacement of a fouled valve with a new body cartridge, which will fit the old union nuts that are likely to be permanently attached to adjacent piping.
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