Do when there are many ways to leak can adopt to solve the online leak sealing way, and if the concrete containment methods to optimize the homework, can ensure good plugging effect and guarantee good thoroughly solve the leak problem. But this does not mean that any leaks, are to be solved by this kind of job, in fact, some case is not fit for this job.

　　So what are the cases cannot be online leak sealing operation? First degree of toxicity for medium polarity is not suitable for this job, because there will be a strong toxicity of medium leakage personal injury accidents caused by adverse conditions. The main pressure components and equipment to the wall pipe, due to the crack leak; The original design of the flange gasket use lens type gasket leak; Pipeline corrosion, the condition of scour thinning leakage points not clear all of these cases, also is not such operations.

　　Not only that, pipeline corrosion and local scour thinning, need according to the relevant provisions of the collision, but if wall thinning to less than calculated value, but the online leak sealing as short-term operation of the temporary emergency measures, but other measures must be taken to ensure safety. In addition, due to the medium leakage, the bolt is higher than the original design under use cases, such as the leakage point temperature, also is cannot the plugging operations.