According to the API standard,
in large oil and gas pipelines, when passing through Class 1 and Class 2 areas such as high-altitude zones, seabeds, and urban densely populated areas, straight seam submerged arcs are suitable for the type of Weiyi.
The length of the weld is longer than that of the straight pipe, which is easy to produce cracks, pores and clips. Welding defects such as slag and welding deviation, and the welding stress is in a tensile stress state. General oil and gas long-distance pipeline design specifications stipulate that spiral submerged arc can only be used in Class 3 and Class 4 areas.
SSAW steel pipe: spiral submerged arc welded pipe. When the coiled pipe is rolled, its advancing direction has a forming angle (adjustable) with the center line of the forming pipe. When the forming pipe is welded, the weld is spiraled. The advantage is that the same specification can be produced. Steel pipe with diameter specification, the material adapts to a large range, the weld can avoid the main stress, and the force is better. The disadvantage is that the geometrical size is poor.ERW steel pipe: high-frequency straight-slit electric
resistance welded pipe, which adopts hot-rolled wide coil as raw material, and undergoes pre-bending, continuous forming, welding, heat treatment, sizing, straightening, cutting and the like, and If you beloved this short article and also you want to acquire guidance with regards to Extreme bikini
i implore you to stop by the web page. has a short weld seam compared with the spiral. The utility model has the advantages of high dimensional precision, uniform wall thickness, good surface quality and high pressure, but the disadvantage is that only small and medium-diameter thin-walled tubes can be produced, and the weld seam is prone to gray spots, unfused, and groove-like corrosion defects. At present, the widely used fields are urban gas, original oil transportation and so on.However; when you consume
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A model shows a smartphone with the connected interface at a photo shoot for a new connected swimsuit collection by French company Spinali Design in Reiningue, eastern France, on June 4, 2015
© AFP Sebastien Bozon
Volkswagen Golf 4Motion, present at the next Geneva Motor Show 2013, is offered in the European market in three different trim levels, in combination with two mechanical turbo diesel gasoil, with outputs of
105 and 150 hp, and common rail injection. With these engines, car fuel consumption records 15% lower compared to the previous 4Motion Volkswagen Golf, with consumption of 4.5 liters per hundred in the case of 105 hp engine and of 4.7 liters for 150 horses.
Mulhouse (France) (AFP) - The Internet of Things -- connecting everyday items with sensors -- is hitting the beach in time for the northern hemisphere's summer with a bikini that says when it's time to apply more sun screen.
Putting the pressure on dirt
High pressure electric pressure washers and gas pressure washers put the pressure on dirt and grime, without putting pressure on the environment. Too many cleaning methods and machines pollute the environment in a number of different ways. High pressure commercial pressure washers and hot water pressure washers can tackle even the toughest kinds of stains and deposits. This kind of a high pressure washer uses nothing except water to get rid of dirt.
For that price, though, the wearer will get a two-piece swimsuit with a small detachable ultraviolet sensor that, through a smartphone or tablet, sends a "sun screen alert" when the user's skin needs more protective sunblock cream.
The new 4Motion system that equips the seventh generation Volkswagen Golf has a total drive system with Haldex clutch and weighs 1.4 kilograms below that of its predecessor, as it does without the pressure accumulator, while having a reaction faster propulsion in different situations, resulting in an increased driving safety and improved driving dynamics.
LSAW welded steel pipe: that is, a straight seam submerged arc welded pipe, which is produced by using a single plate as a raw material, pressing (rolling) the steel plate in a mold or a molding machine, and adopting double-sided submerged arc welding and expanding the diameter. The finished product has a wide range of specifications, and the weld has good toughness, plasticity, uniformity and compactness, and has the advantages of large pipe diameter, thick pipe wall, high pressure resistance, low temperature resistance and corrosion resistance.