The major equipment, process flow, main parameters, overall design scheme and program design of the production line for sand blast both inside and outside the pipe surface are introduced.
介绍了钢管内外表面喷砂除锈生产线的主要设备、工艺流程及主要参数，电气系统总体方案设计和程序设计。
The Paper introduces the application of PLC in Medium-frequency heating bender for large caliber pipe, and design scheme of the main control sub-routine is given.
本文介绍了PLC在大口径中频加热弯管机控制系统中的应用，并给出了控制系统关键子程序的设计方案。
The operation mode of thermal power plants commonly is main-pipe scheme.
热电厂的运行方式普遍采用母管制。
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