BW to SW connection

Normally we would use a B/W reducer 3"X2" then proceed with S/W couplings or ells etc after reducing to 2".

Hello, there are many different ways to do this. You can go with a 3"x2" eccentric or concentric butt weld reducer and then use either a 2" socket weld coupling or butt weld a piece of 2" pipe to the small end of the reducer and use socket weld fittings from then on out. Another possibility is to use a 3" x 2" reducing 90 degree ell and the same set up to convert to socket weld. I have used a 3" x 2" socket weld reducing coupling before but it was a special order and I believe a custom made item. I have also made 3" butt weld x 2" socket weld reducers for certain jobs. If you are branching a 2" pipe from a 3" header you could either use a reducing butt weld tee and and a socket weld fitting from then or use a weld-o-let, soc-o-let or a saddle cut and a coupling to get from butt-weld to socket weld. Most pipe fabricators stop at 2.5" or 2" size for socket weld fittings. I personally try not to use even the 2.5" socket weld fittings if I can get out of it because of the extra weight and the weld time is greater than butt weld fittings. I do not think that 3" socket weld fittings (ells and tees) are made often due to the fact that most pipe suppliers do not stock them. I have always used 3000 lb. rated socket weld fittings and they are stocked normally in my area. I have seen 1500 lb. rated fittings but in my area and although these would work for me most of the time they are special order and the savings is never worth the aggravation of ordering and waiting for them. This is also the case for 6000 lb. fittings in my area as well.

pipewelder

The most common solution is to use swage nipple (concentric or eccentric, depending on the piping configuration requirements) which has 3" Bevel Large End by 2" Plain Small End. To attach the small end of the swage to your SW piping system you would then use a full coupling or another sw fitting depending on your piping arrangement.

As a side note make sure that your swage nipple's wall thickness matches the wall thickness of your heaviest pipe wall. If your 2" pipe system has a wall thickness of sch. 80 and your 3" pipe system has a wall thickness of sch. 40, then your swage nipple should be a sch. 80 wall fitting. To compensate for a difference in wall thicknesses (if required) the 3" end of the swage nipple should be internally taper bored - usually at a 4:1 taper. This is done to have the internal diameters of the fitting match the pipe diameter.

Don

DEAR SIR,

IN FITTINGS I KNOW, FOR BUTTWELD ASME B16.9 OR MSS SP43 IS USED AND FOR THREAED AND SOCKETWELD ASME B16.11. YOU CAN CONNECT SAME SIZE PIPE LESS SIZE PIPE USING EQUAL OR REDUCE FITTING AS PER GIVEN IN STANDARDS EITHER BUTTWELD OR SOCKETWELD/THREADED AS PER ABOVE SAID STANDARDS. WHERE END TO END DISTANCE IS GIVEN.

NOW, FOR YOUR REQUIREMENT FOR CONNECTING 3" PIPE IN BUTWELD AND 2" AND LESS BY SOCKET WED THEN YOU HAVE TODESIGN YOUR OWN FITTINGS,THOSE WILL BE NON STANDARD.YOU HAVE TO MAKE YOUR DRAWING CONSIDERING REQUIRED PRESSUR,MATERIALAND QUANTITY .STANDARD FITTING YOU MAY GET IN SMALL QUANTITY FORM EXSTOCK BUT FOR NONSTANDARD YOU HAVE GIVE QUANTITY.

THANK YOU.

V.D.DEODHAR

vidyadhar deodhar,

It appears that you are trying to over engineer a subject that has been done as routine for a hundred years.

Just follow the advice already given. You should also go to <<www.pipingdesigners.com>> and read all the material posted under Training, Tips, Tools and Standards. Also visit the Technical Forum you will find there.