What is the application scope of \"cross-blast purging\" in low-temperature methanol washing?
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During the purging of low-temperature methanol washing pipelines, pipelines smaller than 600 mm generally require intermittent or explosive purging, while pipelines larger than 600 mm need to be cleaned manually. Especially in the case of blast purging, it is applied to the vertical pipes at the top of each tower, which imposes certain requirements on the blast plates as well as the distance available for blasting. For example. Low-pressure blasting uses aluminum sheets with a thickness of 0.5mm to 0.8mm, and the distance between the blasting points is approximately 7 centimeters as seen from the site. I’m not sure whether such a distance is appropriate I think there should be specific regulations in this regard (for different pressure levels). The pressure for low-pressure purging is around 4 kilograms.
You said, \"The spatial distance for blasting is about 7 centimeters as seen from the site; I’m not sure if such a distance is appropriate.\" ”I think there should be specific regulations in this regard (for different pressure levels). Generally, on pipes, the flanges are fitted very tightly together, as well as at the points where they connect to the equipment. How is it possible to create a 7-centimeter explosion gap when everything is fixed so tightly?
If the support distance of the pipe from the flange is not very close, it can usually be pulled apart using hinges; after that, wood can be used to provide support at the edges
Do ordinary vertical pipes always require blasting and purging when no valves are installed?
I’ve learned about it; it’s great to hear that there’s such a purging method.
If 70mm represents the gap left after the blasting device is installed, I think that’s sufficient. The cross-sectional area for a length of 70mm (PI*D*L) is equivalent to that of a pipe with a diameter of 280mm (PI*D*D/4)
Whether to use blasting or not depends mainly on whether there are valves available for control. In my opinion, if valves can be used to control the purging process, it is less troublesome, time-consuming, and labor-intensive than using blasting. If the diameter of the blasting orifice used for purging by explosion exceeds DN150, the power of the explosion is reduced; it explodes before reaching the desired pressure. As a result, removing and installing the blasting plate becomes a very time-consuming task, usually carried out by the operator himself, which affects the speed of purging. . . .