I’m asking experts to help answer some questions regarding opening holes under pressure
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1. Which specifications are currently in use for making openings in pipes while they are under pressure? Especially in terms of construction techniques, is SY 6150 – Technical Regulations for Plugging Steel Pipes, Parts 1 and 2 – the main guideline to be followed?2. Before starting work on making an opening in a pipe under pressure, it is necessary to weld a flange segment onto the pipe and install a valve connected to the opening machine. Is it required, before welding this flange segment, to use Equation 6.2.1 from SY 6150 to calculate the pressure at which welding is allowed on the pipe? In other words, welding can only be carried out if the operating pressure of the pipe is less than the pressure at which welding is permitted according to this equation.
3. Are there any specifications or formulas regarding the calculation of the pipe wall thickness when welding the aforementioned flange segment onto the pipe?
4. Can the flange segment be welded directly as long as the conditions mentioned in point 2 are met, or are both conditions mentioned in point 3 also necessary for welding to be possible? This is my first time dealing with this, so I would appreciate some guidance from those who are more experienced. Thank you! ! I am extremely grateful! ! !
I forgot to mention one thing: the flow rate of the medium during pressure welding of pipes must not exceed 10 m/s
I think what should be taken into consideration in your question is the physicochemical properties of the medium, such as whether it operates under high temperature and pressure, is toxic or harmful, or has other such characteristics. It’s necessary to check whether the pressure and temperature are suitable for the operation. In typical pressure-containing hole drilling, a short pipe equipped with a ball valve is welded in the area where the hole is to be made. A drill bit matching the diameter of the ball valve is used to drill a hole; once the hole is created, the drill rod is removed and the ball valve is quickly closed. However, during the operation process, some materials will splash and leak. Therefore, it is necessary to consider the specific circumstances and whether they meet the operating conditions for opening holes under pressure; this matter should be given due attention.