Nitrogen pipeline purging
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For long nitrogen pipelines that feed multiple units, purging is carried out before operation – is it necessary to remove the inlet valve assemblies of each unit?
It’s not clear enough, but generally during pipeline purging, it is necessary to do this at the interface in front of the control valve; usually, all that’s needed is to open the valve
Well, ask about the installation. It’s generally not necessary to remove all of them.
Control valves cannot be pressure-tested and purged together with the pipelines; therefore, during pressure testing and purging, the instrument control valves are usually isolated or removed using blind flanges.
It’s not necessarily the case; it depends mainly on the type of valve assembly. For ordinary gate valves and globe valves, it’s sufficient to open them fully and then blow air through them. In the case of control valves, it’s necessary to remove them and connect them using short pipes. It’s also important to install blind flanges at the pipe connections to the equipment, especially in devices such as compressors that require high levels of cleanliness