Weldolet / sweepolet: something about weldolet!!!

What is a weldolet?

Weldolet is the kind of pipe fitting used to make a branch with the littler size of primary pipe. Weldolet normally utilized as a part of piping with high pressure weight and temperature where the connection with the joint type butt weld.

Weldolets are principally sorted as butt weld fittings, as these are welded into the branch pipe. The principle favorable position of weldolets is that it limits stress focus as are well-suited for high pressure weight applications.

Dimensions 

Weldolet

 Size on Size -STD- MSS SP97:

General notes:

• Dimensions: Top Row in Inches / Bottom Row in millimeters.
• Root Gap – X – “Space” for welding the O’let is raised off the run pipe to establish proper weld gap by placing spacers, e.g. welding rods, under the fitting. This provides a uniform welding gap between the curvature of the run and base of fitting.
• L = Dimensions Center Line of Run Pipe + X (Root Gap) + A (height of Weldolet).
• Bevelled Ends ASME B16.9 and B16.25.
• Source comes from Bonney Forge (except the sizes in millimeters).
• Weldolet® is a registered name. Another often used name is Welding Outlet.

How to weld a weldolet?

Weldolet is a trade name, so you will not find the welding requirements in any of the ASME pressure piping codes. You need to look up the welding requirements under the heading of: Integrally reinforced branch fittings. 

In general, the fitting is welded with a CJP groove weld with a reinforcing fillet weld. The CJP groove weld is flush to the edge of the first bevel if there is a compound bevel. The size of the reinforcing fillet is dependent on the specific pressure piping code specified by the Owner.
As far as the problem with the run pipe becoming oval and excessively distorted, the fewer weld passes to achieve the required weld size the better. Distortion is related to the number of weld beads. The more weld beads, the greater the distortion. You could try pre-cambering the run pipe before cutting the hole for the integrally reinforced branch fitting.
The branch fitting should be hand contoured by grinding to ensure a uniform root opening all around the branch fitting before tacking it into position. Most of the fittings are sized by the manufacturer to fit a range of run pipe diameters if the contractor takes the time needed to properly contour the fitting before welding it to the run pipe. Some contractors do not take the step of properly hand fit the branch fitting and then they complain when they don’t achieve the required CJP groove weld.

Sweepolet:

Document refer:

http://www.wermac.org/documents/spacing-welded-nozzles.html

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