Degreasing of the oxygen gas pipeline
Thread Content
I would like to ask everyone: the general regulations for the cleaning and degreasing of oxygen pipelines in gasification state that the degreasing of pipes, fittings, valves, etc. should be completed before installation. Is it possible to carry out a final overall degreasing after installation? Those with experience can share their views and offer some advice.
Generally, degreasing is carried out prior to installation, along with testing and analysis. During the project construction phase, the results of the first degreasing test for oxygen pipelines must be signed by the owner, the construction contractor, the supervision unit, and the testing agency, and these results should be archived. For some valves that cannot be disassembled (such as the main nitrogen emergency valve), complete degreasing is required before they are installed, along with a corresponding testing report. Where possible, it is advisable for the relevant units to conduct a systematic cycle of degreasing after installation, followed by testing and analysis.
Generally, degreasing is not done with an automatic valve, as dirt can easily get inside the valve body, causing sticking
They are all experts; I need to learn more from them in the future*
Degrease before installation; degrease also after installation
After installation, it is necessary to compress, test for leaks, and inspect the welds; only after all that is done should degreasing be carried out? ? ?
Reply to 1# nmexbzf: What industry are you in? We are also carrying out gasification projects at the moment
After installation, the oxygen pipeline not only needs to be degreased but also passivated
This post was last edited by jesse2013 on 2013-11-6 at 15:42: degrease the pipelines, valves, etc. before installation, and carry out cyclic degreasing after installation. After degreasing, it is pickled, passivated, rinsed thoroughly with clean water, and then dried.
It can be done once more on-site; the method used must ensure cleanliness, and secondary contamination is strictly prohibited. However, the on-site degreasing process after installation is not as convenient as before installation; many specialized fixtures can no longer be used. More importantly, many pipes and valves become unserviceable after installation, and the condition of degreasing inside them becomes a \"hidden aspect of the work,\" making it impossible to inspect or evaluate it. Therefore, the previous version must be installed first; installing it afterward and then carrying out the process again has its advantages and disadvantages, as more purging can be done as a form of compensation.