The use of the gas cutting method "live screw inspection" using the gas cutting method "live bolt" is a quick and labor-saving method, but the hot work increases the risk of maintenance. There are the following risk factors during the hot work: (1) The system contains flammable and explosive ammonia. It is a flammable and explosive gas with an explosion limit of 15.7% to 27.4%. The concentration of ammonia in the absorption tower is at Between 15% and 68%. Although the "live bolt" is a hot work outside the absorption tower, it is carried out during the operation of the equipment, thus making the operation dangerous.
(2) The system is a vacuum suction process that is carried out under vacuum or negative pressure. In the case of hot work, once the system has a leak or burns the gasket inadvertently during a hot fire, the fire source will easily enter the system and a fire and explosion accident will occur. (3) Overhaul is mostly for high-altitude operations. Our company uses an internal cooling absorption tower with a diameter of 2.8m and a height of 38.18m. Most of the equipment maintenance operations are high-level operations, and there is a danger of workers falling and falling.
Safety measures and methods of "live bolts" As mentioned above, the gas cutting method "live bolts" is feasible in practical work, but due to its danger, corresponding safety measures and appropriate methods should be adopted. Before using the gas-cut "live bolt", you must go through the "Safety Work Safety Certificate" in accordance with the regulations, remove flammable materials at the site and surrounding, or take other effective safety fire prevention measures. The site also needs to be equipped with adequate fire-fighting equipment and a special person to monitor the fire.
Before the fire, check the vicinity of the moving parts for leaks. If there are no leaks or the leaks have been eliminated, you can do the hot work; otherwise, you can't move the fire. To implement the safety measures according to the requirements of the high-level operation, the "live bolt" method uses the gas cutting method "live bolt", first clean the bolt around, knock out the rust layer on the bolt; then cut the bolt head and nut with gas cutting Only the screw is left; the gas is cut from the two ends of the bolt to the inside, and the depth is controlled according to the thickness of the flange, so that the bolt can be smoothly punched; the remaining part of the screw is punched out with a hammer and steel; replaced with a new bolt. In the above-mentioned "live bolt" process, the hot-fired part of the gas cut is selected at both ends of the bolt, thus avoiding the burning of the gasket and avoiding the danger that the fire source enters the system from the gasket. Use gas cutting from the ends of the bolts to the inside, the purpose is to reduce the resistance when the bolts are pulled, so that the bolts can be easily shot. In actual operation, it is necessary to grasp the depth of the concrete, which is too shallow, and the bolts cannot be punched out; it is too deep, it wastes manpower and material resources, and it is not necessary, and the long-term hot fire causes the flange temperature to rise, which will intensify the gasket. Ageing. Therefore, it is necessary to grasp the depth of the cockroach. In addition, a temporary water pipe can be connected during the hot fire, and an appropriate amount of water is added to the gasket to cool down, so as to prevent the aging of the gasket from being accelerated by the high temperature during the hot fire. After the "live bolt" is completed, the site should be cleaned up to confirm that there is no remaining fire before leaving.
The gas-cut bolts indicate that this method has been well applied in the maintenance of the absorption tower, and the practice has proved that the effect is good. It not only solves the fire prevention problem in the hot work of the running equipment, but also ensures the safety of the person and equipment during the smooth operation and maintenance of the production, and reduces the labor time and labor intensity of the workers and improves the work efficiency. Other operating equipment containing flammable and explosive media can also refer to this method when using "live bolts".
Eco Solvent Inkjet Coating For Canvas
Eco Solvent Inkjet Coating For Canvas,Canvas Fabric ,Canvas Material ,Cotton Canvas Fabric
Guangzhou Quanxu Technology Co Ltd , http://www.skychema.com