Experts your recommendation is requested in selecting the test medium for one of our hot tapping job. As per the procedure after the welding of hot tap fittings (Split Tee) and installation of hot tap valve , we need to test the weld integrity of hot tap fitting by hydro testing the connection. The existing line is high temperature and high pressure steam line. Temp is 200°C. Hence water cannot be utilized since the run pipe is with elevated temperature. Experts please recommend a testing medium for the above the mentioned case considering the risk factor.
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