Heat Induction Bending of High Strength Pipeline Pipe 1

[PipeBender]

I need to know how to heat induction bend high strength pipeline material and maintain mechanical properties within their original tolerances. Specifically I need the chemistry for the mother pipe, the bending rate and the bending temperatures. Can anyone help me find this information?

 

[metengr]

Your post is confusing. If you are asking how to induction bend high strength pipe, you need to purchase an induction bending machine. See below as an example;

http://www.hinesbending.com/hines-induction-bender-specs.html

If you have an induction bending machine for pipe/tube, all of the parameters you are asking above are pipe size and material specific, and require you to qualify an induction bending procedure. I have visited enough vendors that specialize in this forming method that most have a procedure that has been optimized for pipe size range and material.

 

[stanweld]

Thermo-mechanical processing as well as steel chemistry highly influences high strength X65 to X80 line pipe (both strength and toughness). You really need to qualify your induction bending parameters with tensile and impact testing.

 

[PipeBender]

we have a heat induction pipe bending machine and have operated it for decades. we have not used it to bend high strength pipeline bends that must comply with specifications requiring that our after bent mechanical properties meet certain parameters.

we would like to enter this pipeline bending market. we do not have the technical knowledge of what chemistry we should begin with in the mother pipe nor do we know exactly what bend speeds and bend temperatures to operate the bending machine to achieve the after bend mechanical properties. we are not looking to get this information or knowledge for free but, are looking for help or direction in how to gain this knowledge and ability. can you help us with this endeavor? thank you in advance for your time and trouble.

 

[metengr]

PipeBender;
Here is what I would suggest, find a local full service metallurgical test/consulting laboratory. Have them work with you to qualify a bending procedure using pipe material that you intend to qualify. The reason I suggested working with a lab is they should have a staff metallurgist that can provide guidance for testing requirements and interpret results. Yes, there will be a cost, but this cost is necessary and part of doing business to ensure you have a qualified bending procedure. Most likely customers, like myself, will ask to review a procedure and how it was qualified.

 

[stanweld]

You need to be a little more specific regarding grades to be induction bent and impact requirements. Chemistry will vary from grade to grade and toughness requirements. When we first qualified induction bending for X60 pipe with impacts over thirty tears ago, a baseline chemistry of 0.12 to 0.18 C, Mn 1.2% to 1.6%, V + Nb < 0.10%, S < .010% were used. Bend temp at 1625F to 1650F.

You really need to discuss with your steel manufacturer / suppliers

 

[PipeBender]

thanks for your response. we are a contract bender and would be asked to eventually bend practically every grade and impact requirement combination. our question becomes, how do we economically develop this breadth of knowledge required to offer this wide range of offerings to our pipeline customers? thank you again for your response and time.

 

[stanweld]

Talk to Owner/Operator Engineers as well as to pipe manufacturers. You may not be able to induction bend all high strength piping and maintain required mechanical properties due to the unique combination of chemistry and thermo-mechanical processing.

 

[SJones]

Study the appropriate specifications: ISO 15590-1 and ASME B16.49. You will note that qualification bend testing is required and, that in some cases, essential variables are applied to the bending parameters. Performance of these qualification tests will build up your experience database. You should also be called upon to comply with ISO TS 29001 and you will have to demonstrate how you have selected your mother pipe suppliers. So, as people have pointed out, get talking to pipe mills in the first instance before looking at stockists. Very often the mother pipe is free issued to ensure compatibility with the linepipe and you will have to have a good feel for whether you will get the required properties from pipe that you will be forced to use.

Steve Jones
Materials & Corrosion Engineer

http://www.oilandgaspeople.com/cv/11499664

http://www.linkedin.com/pub/8/83b/b04

 

[Mr168]

From the sound of it, it would behoove your company to hire someone with a metallurgical background who is already experienced with this type of work to start developing your procedures. Winning a bid or two would most certainly offset the added payroll expense.

 

[pradipgoswami]

Hi Pipe bender,

Attached is the download link for ISO 15590-1, you may find ASME-B-16.49 from the other internet download sites.

Additionally the following book, would also be useful:-

http://www.fmastore.org/Recommended...ing-of-Pipe-and-Tube-Print-Version-P247.aspx.

Both ASME and ISO documents calls for a bending procedure to be developed and approved by the end user.The procedure has to meet the list of essential variable with are well specified in those documents.
Prior to production bending vendor has to satisfy all the essential variables through successful mock-up or qualification bend.

To start with, a good interaction with the pipe mill would be an excellent point of start.Receiving data on piping materials spec,nominal properties, forming chracteristics, hot/cold, forming process/es,process control,precautions during forming,inspection and Q.A, metallurgical testings, heat treatments etc, would provide good backgound information.

As sugegsted by metengr, you may engage consultants to qualify your bending procedure and achieve required level of consistency.

Thanks.
Pradip