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.