According to the Statistics of Jiangyin Inspection and Quarantine Bureau, in June, the Bureau received 23 batches of 32,300 tons of imported chemicals and the value of goods was 36.65 million US dollars. In comparison with the data of May, the import volume decreased by 64% and the value of imported goods decreased by 62%. %.
Jiangyin Port is an important import and export destination for chemical products in the lower reaches of the Yangtze River. The main imported varieties are n-butanol, benzene, ethylene, phenol, butadiene, etc. Among them, nearly eight become temporary stocks for importers. From January to May, the average monthly import volume was basically stable at 80,000 to 100,000 tons, and the value of goods was 80 million to 100 million US dollars, which was basically the same as in the same period of last year. However, the import volume in June entered a steep fall.
The reason is that insufficient downstream demand has been transmitted to the upstream chemical raw materials, the domestic chemical raw material market exceeds demand, the related imported varieties fail to digest the early-stage inventory, and with the rapid decline in domestic trade prices, the import price is even higher than domestic trade. The price of the price hangs upside down. In order to avoid trade risks, importers have reduced or even suspended imports of chemical raw materials.
Many techniques have been developed for the measurement of pressure and vacuum. Instruments used to measure and display pressure in an integral unit are called pressure gauges or vacuum gauges. A manometer is a good example as it uses a column of liquid to both measure and indicate pressure. Likewise the widely used Bourdon gauge is a mechanical device which both measures and indicates, and is probably the best known type of gauge.
A vacuum gauge is an absolute pressure gauge used to measure the pressures lower than the ambient atmospheric pressure.
Other methods of pressure measurement involve sensors which can transmit the pressure reading to a remote indicator or control system (telemetry).
Gauge pressure is zero-referenced against ambient air pressure, so it is equal to absolute pressure minus atmospheric pressure. Negative signs are usually omitted. To distinguish a negative pressure, the value may be appended with the word "vacuum" or the gauge may be labeled a "vacuum gauge." These are further divided into two subcategories: high and low vacuum (and sometimes ultra-high vacuum). The applicable pressure ranges of many of the techniques used to measure vacuums have an overlap. Hence, by combining several different types of gauge, it is possible to measure system pressure continuously from 10 mbar down to 10−11 mbar.
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