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  • To set up a design dimension standard of welded steel pipe provides basis of choosing material for manufacturing welded steel pipe and other pipes. Take the welded steel pipe widely used in the in physical and chemical industry as an example, to produce a welded steel pipe, company should chose the right diameter for the needs of flow velocity and flow rate, and the design dimension standard of welded steel pipe allows the diameter to fits the certain area using the certain kind of
    welded steel pipe.

    This kind of design dimension standard of welded steel pipe is also an important basis for companies to choose the methods and equipments for confirming the scale of welded steel pipe production. No matter what kind of steel pipe a company want to produce, the welded steel pipe or the seamless steel pipe, there are big differences between design, production, circulation domain and so on. So that it is important to set up a design dimension standard of welded steel pipe to ensure the welded steel pipe produced is qualified and safe. What’s more, the design dimension standard of welded steel pipe is also a basis for the standard of pipeline or elbow. The design dimension standard of welded steel pipe is a basic standard like the thread standard. To consider from the development level of a country’s industry, the standard of welded steel pipe is deeply related to other industries, such as the oil and gas pipes, heat and nuclear pipes, that’s the reason we urgently need the dimension stand.

    The overseas design dimension standard of welded steel pipe are usually composed of piping, machinery and building industry in association with engineers, welded steel pipe, seamless steel tube panel and pipe fittings manufacturers. They are jointly formulated or approved by professionals from these areas. In order to establish the design dimension standard of welded steel pipe in line with international standards as soon as possible, the relevant departments of the welded steel pipe industry should not only the focus on connotation and further changes of the US and Europe standard, but also should remove the institutional barriers formed by history and continue to emancipate the mind.

  • Spiral welded pipe manufacturing techniques:
    (1) raw materials: strip volumes, welding wire, flux.
    (2) steel strip and tail docking,
    (3) before molding, strips should be processing with leveling, cutting edge, surface cleaning and flanging
    (4) control the conveyor pressure cylinders under pressure on both sides with electric contact pressure gauge to ensure smooth transportation of steel strip.
    (5) use external or internal roll-style forming method.
    (6) Ensure the welding seam for the requirements of welding by using seam leakage control device, thus the black steel pipe diameter; alignment tolerance and weld gap were strictly controlled.
    (7) Internal and external are both using the United States Lincoln Electric welding machine for single-or double-wire submerged arc welding, so as to secure a stable specification.
    (8) Finished welding have undergone continuous online ultrasonic instrument checks automatically wound, ensuring 100% spiral coverage of non-destructive testing of welds. If there are defects, automatic alarm and sprayed the tag, according to this, production workers adjust the process parameters and elimination of deficiencies in a timely manner.
    (9) cut the pipe with air plasma cutting machine.
    (10) after cutting into single root pipe, each batch pipe should be strictly examined initially. Check the weld of mechanical performance, chemical ingredients, mix situation, pipe surface quality and official inputs production comes after loss-less flaw test which ensure system tube technology qualified.
    (11) manually ultrasonic and x ray review the weld parts where there is continuous sonic flaw mark, if so, fix it and retest until you have confirmed defects has elimination.
    (12) every pipe should have hydrostatic test pressure radial seals. Test pressure and time are controlled by microcomputer detection device of API steel pipe water pressure tight. Test parameters to automatically print records.
    (13) Machining the pipe end, ensure the perpendicularity, spats and blunt edges of the surface are accurately controlled.

  • Topic by xinlinpipe. Forum: Co i jak

    There are various kinds of steel pipes both in domestic and international markets for your selection, like the welded steel pipe. The steel pipe can be used as the long-distance oil and gas pipeline actually which can ensure the energy security actually. You are advised to choose the API steel pipe from a reliable supplier. However, the surface of the stee pipe should be treated with great care to avoid the corrosion. Although the surface can't determine the corrosion totally, it has great influence except the weather condition, enviromental factors, coating type, quality and so forth. Hence, it is of great importance to learn how to coat the steel pipe in a simple but effective way.

    For example, you are advised to clean it very carefully. In order to remove the grease, oil, dust, lubricants, you are advised to use solvent, emulsion to clean the steel surface actually. However, such cleaning can't help remove the surface rust, oxide, welding flux and so forth. So, you may need a steel wire brush and other tools to polish the steel surface to remove the loose or tilt of oxidation, rust and welding slag. The ultimate goal is to clean actually.

    You can use chemical and electrolytic pickling process to remove oxidation, rust and old coating actually. You are advised to choose the black steel pipe from a reliable supplier. Although using chemical cleaning can remove the rust, oxidation, old coatings very effectively, it is easier to cause the environmental pollution.

    The spray cleaning rust can help remove rust, oxide and the dirt completely actually. Spray cleaning rust is driven by high-power motor spray shooting high-speed rotating blades, so that steel grit, steel shot, steel wire segments, minerals under the centrifugal force on the steel surface spray processing.

    After your cleanning work, you should choose the right paint type to paint it actually. There are various kinds of paints both in domestic and international markets for yoru selection. And you are advised to choose the most proper type actually. You are advised to choose the welded steel pipe from a reliable supplier. As we have introduced above, the paint quality, type may have a great influence upon the surface of the welded steel pipe actually. You can paint it with the spray gun or brush. Generally speaking, the spray gun can paint better and can save you a lot of time and paints.
    Shanghai Xin Lin Co., Ltd.
    Tel: +86-021-61395200
    Mobile No: +86-13611965409
    Fax: +86-021-51561726
    Address: Room 513,No.1, Lane 1029,Kong Jiang Road,Shanghai, China

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