The 50 chemical and petrochemical standards announced this time are mainly focused on the construction of the project, including technical specifications for the foundation reinforcement for chemical construction (buildings), design provisions for chemical rotary kiln, and technical specifications for petrochemical liquid ring vacuum pumps and compressors. Non-destructive testing standards for petrochemical pipelines, etc.
Focusing on the adjustment of the industrial structure and the transformation of development methods, the Ministry of Industry and Information Technology of the People's Republic of China (MIIT) arranged a total of 2,620 standard system projects for the first batch of this year, of which 1,527 were formulated and 1,093 were revised. There are 225 chemical products in the product standards and 21 in the petrochemical industry; 29 in the chemical engineering industry and 33 in the petrochemical industry in the engineering construction standards; 7 in the chemical industry in energy-saving and comprehensive utilization standards; and 49 in the safety production standards.
The masonry bit is a variation of the Twist Drill Bit, the bulk of the Tool is a relatively soft steel, and is machined with a mill rather than ground. An insert of tungsten carbide is brazed into the steel to provide the cutting edges.
Masonry bits typically are used with a hammer drill, which hammers the bit into the material being drilled as it rotates; the hammering breaks up the masonry at the Drill Bit tip, and the rotating flutes carry away the dust.
Hammer drill bits often use special shank shapes such as the SDS type, which allows the bit to slide within the chuck when hammering, without the whole heavy chuck executing the hammering motion.
Masonry bits of the style shown are commonly available in diameters from 3 mm to 40 mm. For larger diameters, core bits are used. Masonry bits up to 1,000 mm (39 in) long can be used with hand-portable power tools, and are very effective for installing wiring and plumbing in existing buildings.
Hand Tool,Tungsten Carbide Masonry,Premium Carbide Drill,Concrete Drill Bits Set Drill
Behappy Crafts (suzhou)Co.,Ltd , https://www.haoyuebehappy.com