good quality seam submerged arc welded stainless pipe

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    good quality seam submerged arc welded stainless pipe

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    DIFFERENCE BETWEEN SEAMLESS AND WELDED PIPES - …

    Jul 24, 2005 · The quality of both welding and non-desrtuctive testing has advanced so much that any consideration of welded pipe being inferior to seamless is quite obsolete. Besides, making seamless stainless steel pipe is an onerous, defect-plagued process while producing welded pipe is …

    In order to know whether seamless or welded pipe can be used in your application you should consult the governing code for the construction. The difference between welded and seamless pipe as far as performance is basically none from a practical standpoint. There are two primary means of manufacturing welded pipe there is Electric Resistance Welding (ERW)small and large diameter and Double Submerged Arc Welded(DSAW)mostly large diameter. There are some issues involved with the quality of welding that can come into play with both welding processes and should be considered when making the purchase. Theses issues can be addressed with the mill if you are purchasing a large order. (Mechanical testing and NDT, third party monitoring of manf.) There are also quality issues with seamless pipe that can be addressed the same way. The key to knowing if the pipe you are purchasing is of good quality is to test it. There are third parties that can perform testing of welded and seamless pipe that you may purchase from a supplier's "on the ground" stock. Let me know if I can give more info.I agree with ElderX in that you need to check the governing code and then also what the client is expecting. They may have had experience with welded pipe that failed and may only accept seamless. In the design of the piping, seamless is considered stronger. A way to look at it is while they both may be welded pipe; seamless pipe has gone thruough a 100% x-ray and no impurities have been found, or those found fall within the aceptable limits. In the design of the pipe, the joint efficiency factor for seamless pipe is 1.0, while for welded pipe it is 0.70, and in some case you may be able to use 0.85. I would also request MTR's (material test reports) on the pipe you buy to ensure it falls within the parameters set forth for each type, whether you are using SA53-B, SA106-B or SA312-304L. While the "seamless" is more expensive, on critical lines and lines exposed to the human factor, we would use "seamless". Hope this helps1I just happened to come across this post and have similiar questions about ERW vs. seamless SST piping that you might be able to help me with. We currently use seamless piping for duct burners and would like to switch to ERW due to cost savings. There is some question to ERW piping having problems due to the heat from the welding reducing the ability of the chrome in the steel to resist going into the carbide phase when heated. Basically they are saying that welded pipe does not perform as well as seamless at very high temperatures. I can seem to get a definate temp. limit or what "performance" means. Any help is appreciatedjellyko, Is your question about selection of materials or cost or what ? If you have a raw water system, without chlorides, either the carbon steel (A53 gr.B) or stainless would be acceptable. The cost for the stainless would be about double (or more) of that for the carbon steel. If sufficient chlorides are present,the stainless may pitt and eventually fail... At 16 bar (~240 psig) a schedule 10 pipe should be OK up to 32 inch diameter for either material. I may be wrong, but with these modest design conditions for a raw water system, your real question should be about materials, possible coatings and installed cost? Good Luck !!!..................................MJC1Thanks for your all reply. Above matters we will use welded pipes(ERW) on you guys help. Because governing code is ANSI B31.1 POWER PIPING and there are no rules confining seamless or welded as I know. There joint efficiency factor is 0.85 for (ERW). But I can't handle the corrosion factor. Therefore if I consider 20 years of warrenty, how much do I consider for their additional thickness? See my first question for application details. PH of river water is 7.5 average. Should I contact corrosion engineer for this matter? Let me know the related document or specification if any. Painting protection may not be allowed in this application(inner part). Our application are both stainless and carbon steel depends on their function(separated lines). I am doing this job to minimize the installed cost for sure. Regards, jellykoGthomas, unfortunately it's not quite that simple. The welding process does change crystal structure, the composition of the metal and hence the mechanical and physical properties of the metal. These changes mean that at various locations across the weld and heat effected zone, you are dealing with effectively different alloys and different grain sizes etc. Your specific application also needs to be investigated, as a result, as temperature is not the only restraint, you also need to know which gasses are involved, etc. Possibly the best idea, is to start seeing how the welded tube performs for situation, by replacing a section of the existing tube. I hope this helps.I'd like to add two brief cautions to the excellent information you have already received 1. Corrosion testing versus open natural source water can't be done out of textbooks. As a couple of colleagues have already stated, "suck it and see" testing (ie actual trials) is necessary. 2. The corrosion resistance of some stainless steels depends on the ability of their chromium content to form a self-healing skin on the surface of the alloy. When the steel is heated, the chromium reacts with carbon to form a carbide, thereby depleting the amount of chromium that is available to resist corrosion. That reaction is one of the reasons why certain stainless alloys lose much of their corrosion resistance when they are improperly heat treated or welded. This is a rough explanation. A more accurate one would be available in a textbook on stainless teels.When considering weather to use seamless or rolled and welded plate, you should check the tolerances in the material specification. I think the material specs you referenced have a plus or minus 12 1/2% tolerance for seamless pipe whereas the rolled and welded plate will have a much lower fabrication tolerance. These tolerances must be considered in your design calculations.Welded stainless pipe can be restored to full passivity by proper heat treating. This usually involves heating austenitic SS to about 2000F and water quenching. Ferritic stainless is heated to about 1650F and quenched. HOWEVER, if the SS is an "L" grade (low carbon, ie, under about .04%) there is usually no need to heat treat the pipe since there is very little carbon available to form chromium carbides.Carbon steel will corrode internally and externally and will require internal coating and external corrosion protection. The latter may be cathodic protection (CP) or wrapping (with or without CP. Common, austentic stainless steels at the conditions you mention - especially if the lines run full and are not left to "stew" for many weeks at a time - will not require internal or external corrosion protection under most circumstances. This is especially true if the welds - circ and long. - get proper post weld cleaning to prevent localized corrosion (and reduce chances of MIC). At todays prices for 304L or 316L stainless steel welded pipe I'd be surprised if this option is not the winner.

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    Quality Seamless Steel Pipe & SSAW Steel Pipe Manufacturer

    The main equipment; Pipe Equipment; ERW straight seam welded pipe production line 6. Both sides of double wire submerged arc welding straight seam steel pipe production line 6, on both sides of the double wire submerged ...

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    Welded vs. seamless steel pipe American Piping Products

    Welded vs. seamless steel pipe. ... That’s opposed to double submerged arc welding (DSAW), which leaves behind an obvious weld bead that must then be eliminated depending on the application. ... Good purchasing practice for welded and seamless steel pipe.

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    SAW PIPE Submerged Arc Welded Pipes - kumsooind

    High toughness, good uniformity and compactness. Welded internally and externally. ... Welded and Seamless Steel Pipe Piles ASTM A333/A334 All Steel Pipe for Low-Temperature Service ... SAW PIPE SAW PIPE Submerged arc welding pipe SAW PIPE in Korea Korea Diameter Pipes

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    Straight Seam Submerged Arc Welded Pipe Is Widely Used

    In addition to the general pipe performance, it also puts higher requirements on its toughness and weld quality. The main materials of straight seam submerged arc welded pipe manufacturers are D36 steel, S355 steel and structural steel plates with Z-direction properties.

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    What is the hazard of the weld seam of the welded pipe ...

    The outer weld seam is high, which affects the shape of the pipe after water pressure expansion When the straight seam submerged arc welded pipe is expanded by water pressure, the steel pipe is wrapped by the left and right outer parts of the inner cavity and the steel pipe with the same diameter expansion diameter. Therefore, the residual ...

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    FAQ What is submerged-arc welding? - TWI

    Submerged-arc welding (SAW) involves the formation of an arc between a continuously fed electrode and the workpiece. ... The arc is submerged beneath the flux blanket and is not normally visible during welding. ... SAW is ideally suited to the longitudinal and circumferential butt welds required for the manufacture of line pipe and pressure ...

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    Difference in ERW and SAWL - seamless pipe,api steel pipe ...

    Longitudinal submerged arc welding ( SAWL steel ) because it uses the welding cold expanding process pipe, so the SAWL pipe dimension precision, using SAWL steel pipe butt counterparts in good quality so as to ensure the welding quality, through expanding technology to some extent by removing a portion of the internal stress.

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    Double Submerged Arc Welded (DSAW) Steel Pipe - …

    Double Submerged Arc Welded (DSAW) steel pipe is available in straight and spiral welded formats and used in a variety of applications. The submerged welding process protects the steel from contamination of impurities in the air. ... Spiral Welded steel pipe is distinguished by the manufacturing process that results in a spiral DSAW seam the ...

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    saw welded steel pipe steels - hittin

    Longitudinal submerged arc welding ( SAWL steel ) because it uses the welding cold expanding process pipe, so the SAWL pipe dimension precision, using SAWL steel pipe butt counterparts in good quality so as to ensure the welding quality, through expanding technology to some extent by removing a portion of the internal stress.

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    WELDING OF STAINLESS STEELS AND OTHER JOINING …

    4 Stainless Steel Welding Characteristics By definition, stainless steels are iron-base alloys containing 10% or more chromium, which imparts to the metal the

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    What is the difference between EFW stainless steel pipes ...

    Require the use of high-quality steel pipe weld line or off-line heat treatment, welding zone structure refinement, quality ERW pipe welds and base metal can reach the same level of toughness, which is submerged arc welding process can not be achieved.

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    Welded Pipe Mill,Welded Pipe Making Machine

    The quality of straight seam submerged-arc welded pipe making machine is reliable in the welding seam technology ... Straight Seam HF Welded Pipe Mill 1. High frequency straight seam welded pipe making machine is suitable for all kinds of round pipe, square pipe and rectangular pipe.

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    FAQ What is submerged-arc welding? - TWI

    Submerged-arc welding (SAW) involves the formation of an arc between a continuously fed electrode and the workpiece. ... The arc is submerged beneath the flux blanket and is not normally visible during welding. ... SAW is ideally suited to the longitudinal and circumferential butt welds required for the manufacture of line pipe and pressure ...

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    Welding advantages of double submerged arc welded straight ...

    Double submerged arc welded straight seam steel pipe is a new welding method invented in 1940, it is the same place and the front of the manual welding it or slag protection, but this residue is not the electrode coating, but melting out welding flux.

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    Double Submerged Arc Welded (DSAW) Steel Pipe - …

    Double Submerged Arc Welded (DSAW) steel pipe is available in straight and spiral welded formats and used in a variety of applications. The submerged welding process protects the steel from contamination of impurities in the air. ... Spiral Welded steel pipe is distinguished by the manufacturing process that results in a spiral DSAW seam the ...

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    Difference in ERW and SAWL - seamless pipe,api steel pipe ...

    Longitudinal submerged arc welding ( SAWL steel ) because it uses the welding cold expanding process pipe, so the SAWL pipe dimension precision, using SAWL steel pipe butt counterparts in good quality so as to ensure the welding quality, through expanding technology to some extent by removing a portion of the internal stress.

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    saw welded steel pipe steels - hittin

    Longitudinal submerged arc welding ( SAWL steel ) because it uses the welding cold expanding process pipe, so the SAWL pipe dimension precision, using SAWL steel pipe butt counterparts in good quality so as to ensure the welding quality, through expanding technology to some extent by removing a portion of the internal stress.

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    LSAW Steel Pipe, Longitudinally Submerged Arc Welding Pipe

    The interior longitudinal seam of the pipe is welded from the inside by fixing 4 welding heads while moving pipe and using submerged-arc welding process. End facing machine The machine levels the pipe end with rotating cutter heads to ensure that required groove and edge specifications are met.

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    Types of welded steel pipe • Cyclotech-engrg_Seamless ...

    The spiral seam steel pipe with coil as raw material is extruded at room temperature and welded by automatic double wire submerged arc welding process. Its advantage is that it can produce various specifications of steel, with good strengthening.

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    Welded Pipe Mill,Welded Pipe Making Machine

    The quality of straight seam submerged-arc welded pipe making machine is reliable in the welding seam technology ... Straight Seam HF Welded Pipe Mill 1. High frequency straight seam welded pipe making machine is suitable for all kinds of round pipe, square pipe and rectangular pipe.

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    Seamless Steel Pipe|Carbon Steel Pipe|Welded Steel Pipe ...

    Hunan Great Steel Pipe Co. is a world-class production and service provider of submerged arc straight seam welded pipe as the first subsidiary of Shinestar Group. Hunan Great Steel Pipe Co. pays more attention to in the pipeline engineering research areas as a pioneer of China Petroleum Pipeline & Gas Pipeline Science Research Institute.

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    Submerged arc welding - Wikipedia

    Submerged arc welding (SAW) is a common arc welding process. The first patent on the submerged-arc welding (SAW) process was taken out in 1935 and covered an electric arc …

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    What's LSAW Steel Tubes? Talk About JCOE And UOE Process.

    LSAW (longitudinal submerged arc welded) steel pipe is a major series of welded steel pipe, and other series includings ERW steel pipe and SSAW steel pipe. According to the differences of manufacturing equipment and technology,LSAW is divided into JCOE double side submerged arc welding and UOE double side submerged arc welding.

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    Welding stainless steel right - The FABRICATOR

    Arc Welding; Welding stainless steel right ; ... In stainless steel pipe welding, sugaring is not allowed for aesthetic or quality reasons, and in any application it can lead to costly rework. Again, stainless steel and the filler metals used to weld it generally are more expensive than carbon steel. ... Submerged Arc Welding . Many fabricators ...

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    Thinking about submerged arc welding? - thefabricator

    A weld camera can keep the operator in a safe position while providing a clear view of the weld in progress. Look at the Whole Picture. Submerged arc welding relies heavily on auxiliary equipment like manipulators or gantries, seam tracking systems, cameras, …

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    DSAW pipe, Double Submerged arc welded pipe - Sunny …

    The manufacturing of Double Submerged Arc Welded Pipe involves first forming steel plates into cylindrical shapes. Then the edges of the rolled plate are formed so that V-shaped grooves are formed on the interior and exterior surfaces at the location of the seam.

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