锅壳式烟管锅炉烟管内置水管的环形螺纹烟道，它涉及锅炉领域。
It is about the ring screw thread smoke channel of the boiler shell type gas tube in the boiler field.
波形炉胆是小型卧式锅壳式燃油燃气锅炉的重要部件，它的质量直接影响着锅炉的正常运行。
The inner hull of wave shape is an important component in small oil burning boiler, and its quality has immediate influence on good running to the boiler.
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