The basic idea of ​​using vacuum to achieve insulation is to add a larger diameter pipe than the extraction pipe to the periphery of the steam extraction pipe inside the condenser, so that a circular space is formed between the two and the annular space can be pumped through. Vacuum to achieve insulation. This method has the following advantages and disadvantages:

1 The method of using vacuum to achieve insulation is relatively simple to implement, but it is necessary to add auxiliary equipment when necessary;

2 Because the added round pipe can be supported on the ribs of the condenser, the additional load on the extraction pipe and cylinder is not large;

3 Because the round pipe is made of thick steel plate, it can be welded so that its tightness can meet the requirements;

4 If continuous vacuum is used, even if its tightness is poor, its heat insulation effect can meet the requirements.

From the above, the use of vacuum to achieve the insulation method, regardless of the implementation of insulation effects and equipment durability are better than the method of installing insulation materials, therefore, it is necessary to pump vacuum insulation Practice.

The lower arc tube of the pipeline is fixed and supported on the ribs of the condenser. At the same time, the hydrophobic holes on the original extraction pipeline are led out by the round pipe. The welding rod is used to weld the upper half arc and the lower half arc plate according to the groove, and each section is welded. If necessary, an expansion joint may be added to the straight pipe section. Other details may be determined at any time during construction.

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