Spiral welded pipe plasma cutting soot handling

Spiral welded pipe plasma cutting soot handling

 

 

1. Standard and Material:

    BS1387 & EN10217 & DIN2458: S185, S235, S235JR, S275, S275JR, S355JRH, St33, St37, St44, St52

    ASTM A53: Grade A, B, C, D

    API 5L: Grade A, B, X42, X46, X52, X56, X60, X65, X70

2. Dimensional Range:

    Outside Diameter: 8" ~ 160" (219.1mm ~ 4064.0mm)

    Wall Thickness: 3.0mm ~ 50.0mm

    Length: 6 meters ~ 18 meters

    End: Plain End, Beveled End

3. Surface Treatment:

    Black Lacquer Painted, Hot Dip Galvanized, Electro Galvanized, Varnish Coating/Anti-Rust Oil Painting

    Coal Tar Epoxy, Fusion Bond Epoxy, 3-Layers PE

Plasma cutting workpiece process will produce a large number of metal vapor, ozone, nitrogen oxides, soot, will seriously pollute the surrounding environment. The key to solve the problem is how to smoke the entire plasma dust sucked into the dust removal equipment, thus preventing air pollution.

For spiral welded pipe plasma cutting, dust difficulty is:

1, the plasma gun nozzle cutting the air blown simultaneously to two opposite directions, so that the smoke coming out from both ends of the pipe, and the installation of the pipe in one direction of the intake port is very difficult to recycle dust.

2, the external cold air inlet gap from outside into the suction machine and a large amount of wind, so that the inner tube is greater than the total amount of soot and dust inhalation of cold air, the effective amount of wind, thus cutting soot absorption becomes completely impossible.

3, due to the cutting area far from the dust intake to reach the entrance of the wind sucked hard twitching soot.

To this end, vacuum hood design principles are:

1, the dust suction air flow is greater than the generated plasma cutting soot and the amount of air inside of the pipe, the pipe should be a certain amount of negative pressure within the chamber, and try not to a large number of outside air into the tube, in order to effectively The dust sucked into the filter.

2, in the pipe after cutting point position will smoke blocked the entrance to avoid cold air into the suction pipe inside the pipe to form a vacuum chamber interior space, so that dust will not emerge, the key is to design block soot facilities production was reliable, and does not affect the normal production and ease of use.

3, the intake port shape and installation position. Suction pipe must be allowed inside the larger pipe inhaling smoke in order to achieve results in the plasma gun position after cutting point plus a baffle that will remain in the steel dust inside the buffer after a period of time can be completely sucked clean.

Specific measures:

The smoke baffle installed in the pipe and placed inside a small car accompanying the plasma gun at the cutting point around 500mm, stay in the pipe after cutting it to reach all the soot absorption. Note smoke baffle must accurately positioned after the cutting position. In addition to the support smoke baffle and steel trolley accompanying rotation coincide with each other, must be allowed to accompany the car to go round the inner angle and roll angle consistent.

For the large diameter of about 800mm diameter spiral welded pipe plasma cutting, you can use this method; For a diameter less than 800mm, small diameter pipe direction soot can not emerge from the do not have to install an internal baffle. But shaper dust suction intake, there must be an external blocking cold air into the bezel.