In late January of this year, Suzhou suffered a rare cold wave. The sudden drop in temperature caused a serious impact on the water supply facilities. There were frequent occurrences of water meter bursts and pipe bursts in the Gusu District. Water leakage in Laoxin Village was particularly serious. After the Spring Festival, the Municipal Water Supply Company carried out the rectification of water supply facilities, completed the replacement of the remaining 11,307 water meters, completed 502 water tank rectifications, completed 612 rectifications of trough boards and external wall transverse pipes, and repaired more than 900 leakage points. At the same time, a survey was conducted on the forms and quantities of households in Laoxin Village and Laoxiang of the urban areas, and on-site surveys were conducted on the current status and damage of water tanks, cross tubes, channel plates, unit risers, and unit valves. Organize professional leak detection personnel to carry out a three-month pipeline network survey from south to north from the east to the west of the new village community, municipal roads, and old streets and alleys. Accumulatively detected 123 missed leaks. The amount of water is about 500m3/h.
According to the newly revised “Contingency Plan for Low-temperature Water Supply Protection in Winterâ€, the municipal water company will establish an early warning system based on actual conditions, which will be divided into three levels: advance notice, warning, and serious warning. The minimum temperature is between 0 degrees Celsius and minus 2 degrees Celsius as the notice level, the minimum temperature reaches minus 2 degrees Celsius (inclusive) to minus 5 degrees Celsius as the warning level, and the minimum temperature reaches minus 5 degrees Celsius (inclusive) and below as the severe warning level. Warning levels that last more than 3 days are upgraded to critical warning levels. The municipal water company will take countermeasures based on the level of early warning and start emergency work.
The “preplan†also divides the water supply area west of Sujiahang Expressway, east of Beijing-Hangzhou Grand Canal, north of Wuzhong Avenue, and south of National Highway 312 into 8 regions according to the key distribution areas of the pipeline network. The number of sub-lists, the status of their sub-district communities, and the situation of key guardianship areas. According to the requirements of the plan, each area is equipped with emergency repair personnel such as film length, vice film length, assistants, correspondents, warehouse management, Guanshui, plumbers, and so on. The area is equipped with automobiles and car batteries, and temporary stacking points for materials are considered. Follow the streets to implement the contact person and assist the old Xin Village and Lao Jie Lane to renovate the water supply facilities and simultaneously strengthen the contact with the street communities. In October of this year, the emergency repair personnel will be implemented in the area. In mid-November, the pilot block will be selected. The entire cold-resisting emergency system will be simulated and the emergency repair process will be improved.
(Original title: tens of thousands of water meters in preparation for cold winter water supply company revised “Contingency Plan for Low Temperature Water Supply Protection in Winterâ€)
PVC Resin
PVC Resin is easy to process, and can be processed by molding, lamination, injection molding, extrusion, calendering, blow molding and other hollow methods. Polyvinyl chloride is mainly used to produce artificial leather, film, wire sheath and other plastic soft products, but also can produce plates, doors and windows, pipes and valves and other plastic hard products.
PVC Resin usually inculde carbide based and ethylene based. K66-K68 PVC RESIN, K59-K55 PVC RESIN, K71-K73 PVC RESIN. PVC RESIN SG5, PVC RESIN SG3, PVC RESIN SG8.
According to the different application scope, PVC can be divided into: general-purpose PVC resin, high polymerization degree PVC resin, and cross-linked PVC resin. General-purpose PVC resin is formed by the polymerization of vinyl chloride monomer under the action of initiator; high degree of polymerization PVC resin refers to the resin polymerized by adding chain extender to the vinyl chloride monomer polymerization system; cross-linked PVC resin is A resin polymerized by adding a crosslinking agent containing diene and polyene to the vinyl chloride monomer polymerization system.
According to the method of obtaining vinyl chloride monomer, it can be divided into Calcium Carbide method, ethylene method and imported (EDC, VCM) monomer method (the ethylene method and imported monomer method are commonly referred to as ethylene method).
According to the polymerization method, polyvinyl chloride can be divided into four categories: suspension polyvinyl chloride, emulsion polyvinyl chloride, bulk polyvinyl chloride, and solution polyvinyl chloride. Suspension process polyvinyl chloride is the largest variety in output, accounting for about 80% of the total output of PVC. Suspension method PVC is divided into six models according to absolute viscosity: XS-1, XS-2--XS-6; XJ-1, XJ-2--, XJ-6. The meaning of each letter in the model: X-suspension method; S-loose type; J-compact type.
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