多管式小型貫流ボイラの定義に関する一考察

（内部流れ学の視点からの考察）

抄録

A consideration has been made on the definition of multi-tube type package boiler from the viewpoint of internal fluid and thermal flow study. Regarding the heating surface area, maximum pressure, that heating tubes are all rising tubes, circulation ratio, header and separator, several ideas on the definition were presented. It is expected that definition of a multi-tube type package boiler will be reviewed and revised from various viewpoints on the basis of safety first. For the future globalization, it is hoped that multi-tube type package boiler will become a product to be more proud in the world.