At present, the common air ducts in the domestic market are generally made of galvanized iron sheet, commonly known as white iron sheet. production Sanding pipe And the thickness is 0.44~1.22mm. The thickness of iron sheet of air duct in China is generally less than 1.5mm, and the thickness of zinc coating refers to the national standard GB/T 13912-2002: 35 μ m. Average 45 μ m。 During the production of galvanized air duct, the national standard requires us to understand the following figures: 1. Appearance: conduct appearance inspection on all hot galvanized parts, and the main surface should be smooth, free of falling off, roughness and zinc spikes (if these zinc spikes will cause damage), free of peeling, missing plating, and residual solvent residue, There shall be no zinc lump and zinc ash in the parts where hot galvanized workpieces are used or where they are corrosion resistant. Note: "Roughness" and "smoothness" are relative concepts, and the coating roughness of workpiece is different from that of mechanical roller or (and) blow molding and galvanized products (such as galvanized steel plate and galvanized steel wire). As long as the coating thickness is greater than the specified value, there may be dark or light gray uneven areas on the surface of the plated parts. White rust (mainly white or gray corrosion products of alkaline zinc oxide) is allowed on the surface of galvanized workpieces stored in wet conditions. 2. Thickness: quantitative sampling shall be carried out according to the specified test method for coating thickness test. According to the size of the main surface area of hot-dip galvanized parts, the coating thickness measured in the test shall meet the following requirements: A) For parts with the main surface area greater than 2m (i.e. large parts), the average coating thickness measured on all basic measured surfaces of each part in the sample shall not be less than the minimum value of the corresponding average coating thickness: B) For parts with the main surface area less than 2m, Sanding pipe company The local coating thickness measured on each basic measuring surface shall not be less than the minimum local thickness, and the average coating thickness measured on all basic measuring surfaces of the sample shall not be less than the corresponding minimum average thickness.

How to install correctly Changsha Sanding pipe ？ In the fire smoke exhaust pipe system, the airport and air valve must use non fuel, and the thickness of citizen flue and galvanized ventilation pipe should be improperly used. The high-pressure system should be selected according to the national code GB50243. When the fire smoke exhaust fan is installed on the roof, certain maintenance measures should be taken. The exposed power line must be threaded through the conduit, and the conduit material should be combined with the metal hose or Capelli and duck neck equipment to make it curved. The fire fighting system and equipment lines must be fixed with special clamps to avoid falling. Stainless steel air duct and ventilation equipment shall be made of three fabric flame retardant materials with soft connection. It is suggested that the length should be 15-30cm, and the electrical interpenetration should be completed. Bolts require the same length. The three main bodies should be grounded, ventilation equipment, and equipment and devices between dynamic loads should be equipped with shock absorption measures. When Sanding pipe company Box type pipe fittings should not be used for changing direction, variable diameter, branch road, or junction, but the wind speed of box section should not exceed 1.5m/s for air distribution and static pressure box when necessary; It is advisable to have 5-10 times the pipe diameter between conduit pipes. The length of expandable metal pipes or non-metallic soft links should not exceed 2 meters. There should be no disintegration and dead corners. During the installation process, when the length of pipe elbows and straight pipes exceeds 20 meters, add anti impact frame open room exhaust fans and add or subtract supports.

The air conditioning in the hall of a giant building is provided by the 6FWB unit fixed in the basement. production Sanding pipe The vibration of the unit is transmitted to the ground hall through the bridge connecting the sand blasting hose pipe, and the noise value reaches 45dB. In such an environment, people always feel uncomfortable. After the improved design, sandblasting rubber pipes were connected in series on the connecting pipes, which not only absorbed some of the noise generated by the unit vibration, but also the noise generated by the fluid pulsation in the pipeline system. At this time, the noise value in the ground hall was only 33dB, greatly improving the environment in the hall. The movable cylinder on the vulcanizing press will move upward and downward for the need of loading and unloading the mold. After repeated reciprocating movements, the copper serpentine will suffer from fatigue fracture. Although it can still be used after repair, it will cause time loss if it is stopped for repair. Sanding pipe company Although it has good soft properties and strong fatigue resistance, it is weak in pressure bearing, temperature resistance, aging resistance and other aspects, and can not continue after several months of use. The good comprehensive performance of sand blasting hose is fully reflected here. In the general industrial field, in addition to pressure and temperature, there are often severe conditions such as fatigue, corrosion, vibration, compression, impact, etc. Under such circumstances, it is most appropriate to use sandblasting hose to compensate for the position movement of the pipeline.

Changsha Sanding pipe Main impact: The air volume loss of the whole system is too large to meet the air volume requirements, and the power is seriously wasted. 1. If the stainless steel welded air duct system adopts the combined flange air duct, it may be that the seam, flange strip seam and hole seam are not sealed with sealant; The allowance of segment blanking seaming is greater than the specification requirements. 2. No embedded parts are set at the joint of brick structure air duct and metal air duct, or the sealing gap is too large or the joint is not tight. Countermeasures: 1. Button type seaming can be used for medium pressure air duct; Corner seam or joint corner seam shall be used at four corners of high-pressure air duct or clean system air duct. 2. Seams of stainless steel welded air ducts, joints without flange inserts and holes must be sealed with sealing paste to prevent air leakage. 3. During construction, embedded parts shall be set at the junction of brick, structural air duct and metal air duct as required, or the civil engineering unit shall cooperate to block and seal to ensure close connection. During the air duct anti-corrosion treatment, the next anti-corrosion treatment can be carried out after the previous paint is dried; It is strictly forbidden to work without certificate. The duct type air outlet is a central air conditioning terminal air supply system that integrates the functions of air outlet, air supply pipeline, static pressure box, thermal insulation material, air valve, etc. Sanding pipe company Calculation of air duct size of stainless steel welded air duct: the equal damping method (equal pressure method) is a convenient calculation method, which is suitable for many occasions.