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403 The design of the process piping is performed directly on a model of the project. 工艺配管的设计是直接按照工程项目的一个模型完成的。 404 The model is an actual working tool for piping. 模型是配管用的实际工具。 405 Piping erection work include: prefabrication, placing, aligning, welding and bolting. 管道安装工作包括：预制加工、安置、对准、焊接和连接。 406 Our piping prefabrication workshop covers a total area of 1000m2. 我们的管道预制加工厂拥有一千平方米的面积。 407 We can perform the pipe by following operations: cutting and mechanical chamfering, manual and automatic welding. 我们可以对管子进行下列预制加工：切割和机械加工坡口,手工和自动焊接等。 408 The computer generates isometric drawings and prints out bill of materials. 计算机绘出管道空视图,并打印出材料明细表。 409 We shall complete the manhour requirements for the site fabrication (site erection ) of this drawing. 我们将制订这张图纸现场制作(现场安装)所需的工时条件。 410 Seamless steel tube is made in sizes for 1/8 to 24 inches. | 
