Precautions in the maintenance process of straight seam steel pipes

Straight seam steel pipe is a kind of welded steel pipe that is transformed into a cylindrical shape after forming a hot-rolled steel coil through a forming machine. The high-frequency current skin effect and proximity effect or arc combustion under the flux layer are used for welding, so that the edge of the tube blank is heated and melted under a certain extrusion pressure and finally cooled and formed. Petroleum, metallurgy, construction, coal mines, ports, machinery and other industries are widely used in oil and gas transportation, low-pressure water gas transportation, mining fluid transportation, belt conveyors, automobile drive shafts and other industries.

Longitudinal welded pipe equipment plays an important role in people's life and work. However, the maintenance of straight seam steel pipes has always been a headache. Let us understand the precautions in the maintenance process.

1. Choose the right location and warehouse

①The place and warehouse for storing steel pipes should be clean, free of water, and far away from factories and mines that produce harmful gases and dust. Weeds and debris should be removed on site to keep the steel pipes clean.

②Do not stack corrosive substances such as acid, alkali, salt, cement, etc. on the steel pipe in the warehouse. Different types of steel pipes should be stacked separately to prevent confusion and contact corrosion.

③Large section steel, rails, faded steel plates, large diameter steel pipes, forgings, etc. can be stacked in the open air.

④Small and medium steel pipes, metal wires, steel wires, medium-diameter steel pipes, steel wires and steel ropes can be stored in a well-ventilated material shed, but underlays must be installed.

⑤You can put some small steel pipes, steel strips, silicon steel plates, steel plates, small or thin-walled steel pipes, various types of cold-rolled and cold-drawn steel pipes, and high-priced and easily corrosive metal products inventory.

⑥ Choose a warehouse based on geographic location.

⑦The warehouse should be ventilated on sunny days, and closed on cloudy and rainy days, and a proper storage environment should be maintained.

2. Reasonable stacking, put first in first

①The principle of stacking is that under stable and safe stacking conditions, stacking should be carried out according to varieties and specifications, and materials of different varieties should be stacked separately to avoid confusion and mutual corrosion.

②It is strictly forbidden to store items corrosive to steel pipes near the stacking position.

③The bottom of the pile should be high, strong and flat to prevent the material from being damp or deformed.

④Similar materials are stacked in the order of storage, and the principle of first in, first out is realized.

⑤For section steel stacked in the open, there must be wooden mats or stone bars underneath, and the stacking surface should be slightly inclined to facilitate drainage, and attention should be paid to the flatness of the material to prevent bending and deformation.

⑥The stacking height of manual operation should not exceed 1.2m, the stacking height of mechanical operation should not exceed 1.5m, and the stacking width should not exceed 2.5m.

⑦There should be a certain passage between the stacks, the width is usually 0.5 meters, and the approach road depends on the size of the materials and transportation machinery, usually 1.5-2 meters.

⑧The bottom is raised, the warehouse is a concrete floor, and the height is 0.1m; if it is muddy, it must be filled with O. 20.5m. If it is a wilderness, the cement floor is raised by 0.30.5m, and the sand and mud surface is raised by 0.50.7m.

⑨ Angle steel and channel steel in the open air environment should be bent downward, that is, the steel pipe should be downward and erect. The channel surface of the steel pipe should not face upwards to prevent the accumulated water from rusting.

3. Packing and protective layer of protective materials The preservatives or other electroplating and packing used by the steel plant before leaving the factory are important measures to prevent the material from rusting. During transportation and loading and unloading, care should be taken to protect it to extend the storage period of the material.

4. Keep the warehouse clean and strengthen the maintenance of materials

①Before entering the warehouse, care should be taken to prevent rainwater from getting wet or mixed with impurities, and according to its performance, use different methods to clean contaminated materials. For example, available high-hardness steel wire brushes, cloth, cotton, etc.

②The materials should be checked frequently after storage. If there is rust, please remove the rust layer.

③After the surface of ordinary steel pipes are cleaned, there is no need to apply oil, but the inner and outer surfaces of high-quality steel pipes, alloy steel, thin-walled pipes, alloy steel pipes, etc. must be coated with anti-rust oil.

Tips:The ASTM A500 specification covers cold-formed welded and seamless carbon steel tubing in round, square, rectangular, and “special” shapes for welded, riveted, or bolted construction applications, as well as for general structural purposes.


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