What should be noted during purging after installation is complete?
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As the title suggests, once the instruments have been properly installed, what considerations should be taken into account when purging the equipment? Is it necessary to remove the control valve and install a short sleeve, before reinstalling the control valve after the purging is complete?
It’s not that exaggerated, right! After the general pipeline installation, purging can be carried out with the valves fully open; they should be closed after the purging is complete ； For systems such as steam systems, higher requirements are placed on pipeline cleaning, as it is necessary to remove everything inside the pipes completely.
I’ve encountered this problem before: due to carelessness during welding, the welding rod fell into the pipe and was forgotten there. When trying to blow it out, the welding rod got stuck in the control valve, which resulted in damage to the valve core
Yes, during purging, both the self-regulating valve and the flow meter need to be replaced with bypasses; this is what is referred to as the issue of \"secondary installation\".
When blowing out, be sure to remember to remove the control valves and other local meters; otherwise, it will be you who suffers the consequences. I have suffered great losses in this regard.
Is it about removing the valve, the primary gauge, or is it the positioner?
When purging the process pipeline, the valves are removed – that means taking off all the automatic control valves installed on the process pipeline. The air supply line needs to be removed, as well as the signal line. This is generally the responsibility of the construction party. Every time we put a new device into operation, we relied on luck, only to end up having to remove it online anyway. . . . Later, when cleaning the pipelines, I properly removed all control valves (usually single-seat types), flow meters, and orifice plates, and closed all primary valves. That’s why, when the materials are put into use, there’s still a possibility that impurities such as weld slag could jam the small-diameter valve core, requiring it to be removed while the system is in operation. Piping purging is extremely important. The most problematic incident that year was when, after the materials were put into use, it was impossible to accurately measure the air flow rate through the orifice plate. It wasn’t until it was disassembled that it was discovered that the layer of paper stuck to the orifice plate had not been removed. . . . . .