Is high-point venting required for three-dimensional pi-type bends?
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Dear sea friends, for the common three-dimensional Pi-shaped bends found in factory areas, if hydraulic pressure is to be applied, where is it usually necessary to install vents at the higher points? Is the location shown in the diagram a common one? Thank you all!
The location in the image is common; no problem. Refer to the specifications: available in \"Piping Design Engineering Examples\"
These substances are rarely added to lines handling toxic and hazardous materials; instead, they are more commonly found in steam lines
A hydrostatic test is generally required; it can be omitted for pipes with a diameter of DN25 or less. If it is not carried out, the pressure cannot be increased during the test, and the gauge pointer will fluctuate, making it difficult to conduct inspections. After toxic and harmful hydraulic testing, flange covers or pipe plugs are generally used to seal it off
The original poster didn’t say it was a toxic or harmful gas; what you’re saying is the same as saying nothing at all
As required, this should be available; the design will also take this into account, otherwise the exhaust won’t be clean enough
The same requirements apply here as well: a high-point drain is required. At this location, the design will include dual valves along with blind flanges, and the valves will be welded to minimize the risk of leaks.
On the plant area ductwork, some design institutes mark high-point vents, while others do not. If the pipeline transports non-corrosive media, the pipes outside the plant are rarely maintained; the purpose of high-point venting is mainly to release air during hydrostatic testing after the pipeline construction is completed. Some design institutes believe that evacuation at this stage is part of the construction process and should be handled by the construction party; therefore, it is not necessary to indicate the highest points on the drawings
High-point exhaust must be designed in the drawings; refer to **Standard Specification SH3012, Industrial Pipeline Design and Engineering Examples, Pressure Pipeline Design Techniques**