The Application of Spiral Steel Pipe in the Urban Central Heating
Urban central heating is generated by the concentrated heat of steam, hot water supply mild steel pipe network through a city or parts of the heating used in the production and living way, which consists of heat, heat networks, heat users of three parts.
Urban central heating system, the urban economic and social development, infrastructure, and its level of development is a sign of urban modernization. The development of urban central heating area of ??urban construction in China has become a basic policy.
Central heating cogeneration and distributed mainly to the superiority of heating comparison, the focus in the following areas:
1, there is good value for money. Boilers for central heating with large capacity, high thermal efficiency can reach 90%, and scattered small boiler thermal efficiency of heating is only about 60% or less. Therefore, instead of scattered urban central heating heating together can save 20 to 30% of energy.
2, good environmental benefits. Urban pollution comes mainly from direct coal combustion produces carbon dioxide and soot. Central heating boiler capacity, and have better dust removal equipment, using high-efficiency filter, dust removal rate of 90 to 98% or even higher, can effectively reduce urban pollution.
3, good social benefits. Urban central heating for the convenience of people’s living, saving precious urban construction sites, to ease the power shortage situation in urban areas of great significance.
Ocean engineering steel pipe design and the selection, specification is according to the classification of ocean engineering steel structure, and with reference to the API (American petroleum institute), AISC (American society for steel structure), ASTM (American society of testing and materials), ANSI (American national standards institute), ASTM (American society of testing and materials), AWS (American welding society), NACE (national association of corrosion engineers) standards and guidelines. Demand for ocean engineering steel pipe materials, essentially is the requirement of steel plate itself, has a low carbon steel, high strength steel, ultra-high strength steel, stainless steel four categories. Mention two points here:
(1) ocean engineering of imported equipment very much. Sometimes for British steel tube and steel tube production is particularly high quality requirements. In ocean engineering belongs to the special area of the steel tube, 100% its all requirement for weld ultrasonic testing (UT – Ultrasonictesting) and magnetic inspection (MT – Magnetictesting). Included in the main structure of steel pipe, in the range of 300 mm on both ends of the longitudinal seam require 100% UT and MT.
(2) the production of pipe node belongs to the important content in ocean engineering. Special pipe node factories abroad, and domestic are built unit. Capacity of 52000 tons, for example, “friendship” of the bohai sea, floating production storage unit (FPSO, and train one of China’s top ten famous shipping) of the special soft just arm (YOKE) the YOKE mooring system and support bracket, the torch tower, helicopter platform support, etc. There are 221 nodes, to meet the requirements of AISC, AWS. 59 km long pipeline (including remote control hydraulic tube 28 km, 119 remote control valve, tank deck 48 road). Shipyard in order to ensure the quality of construction, choose from thousands of welder dozens of excellent welding, the last 15 qualify as 6 gr of the classification society. In ocean engineering in order to prevent leakage of oil and gas in the system, is not adopted steel pipe flange connection, and adopts argon arc welding. Three group of TIG welder shipyard and need special training.
Post time: Sep-05-2019