Plastic Flowmeter is a widely used instrument in water treatment engineering, mainly used for flow detection, usually installed after the water pump, to control the water intake of each structure, currently the most widely used are electromagnetic flowmeter and ultrasonic flowmeter.
In the selection of the flowmeter, the first thing to consider is the corrosiveness of the measured medium to the flow-passing parts, so as to avoid affecting the service life of the flowmeter due to the corrosion of the medium;
During the design and installation process of the flowmeter, the length of the straight pipes before and after the flowmeter needs to be considered. Usually, the principle of 5D before and 3D after the flowmeter is followed. Here, D is the inner diameter of the pipe. If the length is insufficient, the measurement accuracy will be affected. When using an ultrasonic flowmeter, the distance between the first 10D and the rear 5D must be met, and the distance from the flowmeter to the water pump must be more than 30D.
When selecting the type, the flow rate of the medium in the pipeline needs to be between the maximum value and the minimum value of the selected flowmeter, and avoid approaching the maximum or minimum value, so as to avoid affecting the measurement accuracy.
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(1) According to the field of use, it is generally divided into two categories: military explosives and civilian explosives. Mining explosives are the main components of civilian explosives.
(2) According to the physical state of explosive products, there are solid explosives, liquid explosives, gas explosives and multiphase explosives.
(3) According to the characteristics of use and its use, it can be divided into primary explosives (primary explosives), explosives (high explosives or secondary explosives), propellants and pyrotechnics.
(4) According to the chemical composition classification, it can be divided into single explosives (explosive compounds) and mixed explosives (explosive mixtures).
Mine explosives are mainly mixed explosives composed of an oxidant (such as ammonium nitrate) and a combustible agent according to the principle of near-zero oxygen balance.
Characteristics and classification of explosives
Explosives under the proper role of external energy, chemical reactions can take place quickly and generates a lot of heat and material in gaseous product. The following methods are commonly used for explosive classification.