Information related to filling out blind plate tickets
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Dear friends, I have a few questions regarding the filling out of permits for blind plate installation and removal. The first one is that according to GB 30871-2022, it is not allowed to carry out blind plate installation and removal operations at more than two locations on the same pipeline simultaneously. So is it a violation to perform blind flange operations simultaneously on the main line and branches of the same pipeline? Should both the main pipelines and the branch pipelines be drawn when creating a blind flange diagram? The second point concerns the filling of temperature and pressure values for blind plate tickets – these should reflect the design temperature and pressure of the pipeline. When conducting risk analysis, should it be carried out strictly in accordance with the design temperature and pressure values (as suggested by experts from outside), or should the analysis be based on the actual operating conditions and tasks at the site, as required by national standards? The third point is whether a permit for blind plate removal and installation is required for installing blind plates at the blind sections on both sides of the pipeline to be cut. Pipe line dead ends generally do not have blind plate identification tags or blind plate numbers; how should this be filled in on the blind plate permit? The fourth point is that certain special tasks require certification to be carried out, but the special operations certificates do not include a category for blind plate work. Does this mean that those who perform blind plate installation and removal tasks do not need any qualification certificates?
All of the questions you raised above must be based on risk identification and control. 1. Regarding the question of whether performing blind plate operations simultaneously on the main line and branches of the same pipeline is a violation of regulations, it is necessary to analyze whether carrying out such operations at the same time could result in hazardous energy-containing substances entering the main line or branches 2. Regarding whether both the main pipelines and the branch pipelines should be drawn when creating a blind flange diagram. ”If the entire system is thoroughly replaced, then there’s no problem. But if it’s still in operation, tickets and drawings need to be handled separately. 3. Regarding the \"pipeline parameters\" field on the blind plate ticket, it is designed to help you select the appropriate blind plate. It is necessary to choose a blind plate that is suitable for the pipeline’s medium, pressure, and temperature. For example, if the designed pressure of the pipeline is 1 megapascal and the normal operating pressure is 0.5 megapascal, then it is essential to ensure that the blind plate remains reliable even in extreme situations where the operating pressure rises to 1 megapascal; the blind plate should not be selected based solely on the operating pressure. 4. Regarding “installing blind flanges on both ends of the cut pipeline,” normally, blind flanges should be used. This involves equipment changes; it is necessary to update your P&ID diagrams accordingly and include this item in the blind spot management records, with increased inspections during winter. 5. Regarding \"special operations that require certification to be carried out,\" in accordance with the **specified list of special operations, having the appropriate certificate is sufficient; when it comes to special operations that require certification, this generally refers to possessing a \"special operation permit\"”
I’ve learned it; thank you very much:victory: