Questions regarding the hydraulic testing of steam storage tanks that have not been in use for a long time
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I have a steam storage tank purchased in 2002, which was custom-made by Shanghai Shenjiang Pressure Vessel Factory. I am now unable to take it to the special equipment inspection agency for repairs, as I don’t have the necessary registration documents or any of the certification papers from the time of manufacture. The supervisor wants to see if it can be used again during the experiments. We are currently conducting hydraulic tests, and the problem we’re facing is that there is some leakage at the seal of the air tank’s access hatch, but it’s not severe. There is also some water seepage at the flange end caps. But none of them are very serious. After working on it for about an hour, the pressure dropped by around 0.1 kilogram. The design pressure is 1.1 MPa, and the operating pressure is 0.8 MPa. We test at a pressure of 0.7 MPA (it will not exceed this value in use). The storage tank has a volume of 0.24 m3 and a diameter of 500 mm. Design temperature: 179 degrees. In future experiments, we will store steam, but the hydraulic tests are conducted in a cold state. Can this truly reflect the pressure resistance of the gas storage tank? I would like to ask the experts here: Can my steam drum still be used? ? Since we couldn’t open it ourselves either, we don’t know the extent of the rusting inside. Are there any safety hazards? The sealing area at the manhole is a bit rusty; I’m not sure if the gasket can be replaced by myself Thank you all. Please speak up actively! Thank you so much! Or maybe there is a better way. Please offer your suggestions. This post was last edited by kisml on 2009-4-1 10:07.]
The condition for it to be usable is that it is a pressure vessel; prior to use, it must undergo inspection and registration at the local quality inspection authority. Secondly, in the case of leaks, as long as it is not a leak from the equipment itself or its welds, the component can be disassembled, ground, and a new gasket installed to resolve the issue. Third, your hydrostatic test pressure is incorrect; it should be 1.25 times the design pressure. The pressure drop value has no reference value. Fourth, the corrosion level can be determined using a thickness gauge. Items 3 and 4 were already included during the inspection by the Quality Supervision Bureau.