WeldOlet welding

admin

Dear All,I have a weldOlets of 40"x18" and 36"x18" to be used on the main Headers takeoffs to pumps.What about the welding requirments for this WeldOlets ? how many passes ? and what is the recommended fillet size ?.The client is asking me to cover all the WeldOlet bevel with weld ? is that right ?I appreciate your help.Regards,
Reply:the client is not telling you the procedure he wants followed? use 6010 on the root and hot pass and 7018 for the rest. and yes codes require that weldolets be filled all the way even though it may be heavier than the rest of the piping , makes no sense..before weldolets the was the fishmouth.....what is being pumped?
Reply:What?  6010 and 7018?  How do you know what material he's working with?  Why should the client tell him what procedure to follow when just about every code requires independent procedure qualification?  Code requires weldolets be filled all the way?  What code?  Can you cite any examples?  It sure as hell isn't any ASME code, as those require you to weld out exactly as much as is needed by calculations and nothing more.m_abdelhadi:  Assuming your olets come from a reputable manufacturer such as Bonney Forge, there are two distinctive lines on the weldolet - a weld line and a rib.  The rib is the higher line that runs above the fishmouth and defines the top of the skirt.  The weld line stops at the end of the bevel around the fishmouth. When these weldolets are sized and chosen by pressure rating, they need to be welded ONLY up to that weld line to meet those requirements, NOT up to the rib as is common poor practice and misunderstanding.  By the client saying they want the entire bevel welded, they SHOULD be indicating the weld bevel, not the skirt area leading up to the rib.  If they want it welded up to the rib, I would ask for justification, as all this does is increase distortion around the pipe circumference and create stress risers.  Be aware that with olets that size, you may very well need to postweld heat treat.Take a look at page 35 of this PDF from Bonney Forge, it should tell you most of what you need to know: http://www.bonneyforge.com/resources/BC.pdf
Reply:Supe,I really appreciate ur reply .. it was really of great benefit to me.Catalogue was very illustractive n clear.Now i understood that i have to be welding only till the weldline of the weldOlet not till the rib. But in my case of 40" x 18" WeldOlet , I have this bevel space at the crotch is almost 5 cm till the weldline , which is (as i think) very big to apply subsequent reinforcing passes all over it. Or should I ?Thanks again.
Reply:Attached is a picture of my WeldOlet ... if u can see the size of this bevel end , its very large to apply welding passes all over. Kindly advice me about this cause maybe am still getting it wrong. Regards, Attached Images
Reply:That appears to be a "copycat" weldolet.  Unfortunately, there are no calculations that come from the manufacturer as to how much to weld out.  You only have two real options here - either weld out the entire bevel, or perform the actual stress calculations yourself to determine the volume of weld metal necessary.  More than likely, you'll end up filling the entire weld bevel, especially since the client is requesting it.
Reply:Originally Posted by SupeThat appears to be a "copycat" weldolet.  Unfortunately, there are no calculations that come from the manufacturer as to how much to weld out.  You only have two real options here - either weld out the entire bevel, or perform the actual stress calculations yourself to determine the volume of weld metal necessary.  More than likely, you'll end up filling the entire weld bevel, especially since the client is requesting it.
Reply:[QUOTE=Supe;434298]What?   Code requires weldolets be filled all the way?  What code?  Can you cite any examples?  It sure as hell isn't any ASME code, as those require you to weld out exactly as much as is needed by calculations and nothing more.ansi/asme 31.1, fig 127.4.8 (e) & (f)..but those are for 2" and less..hmmmmm