Branch Fitting Shapes/Types

Branch connection fittings, commonly referred to as O'lets allow a smaller "branch" pipe to be extended from a larger (or same sized) pipe run.   Branch fittings are preferred whenever a non-reinforced miter-branch is satisfactory to withstand the internal pressure requirements.

Branch Fitting—MSI Supply, Inc. Get A Quote

 

 

Inventory

MSI Supply can often provide the items listed below for a same-day delivery.  Large quantites, custom sizes, and special alloys (Alloy 20, Monel, Hastelloy, Inconel, Titanium, etc) may be subject to a longer lead time for delivery.

Size Range:

1/4" to 36" Run Diameter, 1/4" to 2” Branch Diameter

O-Let Style:

Weldolet, Threadolet, Sockolet, lateralolet, nippolet, elbolet

Standard Materials: 

A105, 304 SS, 316 SS

Exotic Alloys:

A20C276Duplex 2205Duplex 2507MonelInconel 600Inconel 625Incoloy 800Incoloy 825

Ordering Information

There are several things that must be specified when ordering branch fittings, such as: branch diameter, run diameter, O-let style, material, and rating.  The rating will be a pipe schedule for weldolets, to match the schedule of the pipe in the system, and the rating will be a pressure class for threadolets and sockolets. 

Branch and Run Size

The dimensions for a branch fitting are a common source of confusion.  When specifying the dimensions for an o-let, the first dimension will indicate the diameter for the branch, and the second dimension will be the diameter of the run.  As the image shows, the main pipe onto which the branch connection is welded is usually called the run (or header), and the pipe to which the branch connection provides extends is referred to as the branch (or outlet) size.

Branch

 

However, as can be seen in this image, the curvature beneath the O-let provides a "saddle" that is suitable for mounting on a range of "run" sizes. The chart below indicates the run size ranges, by outlet diameter, for Bonney Forge Weldolets (XH and STD), Threadolets (3000#), and Sockolets (3000#). This chart also illustrates the importance of specifying the run diameter for the o-let application when ordering o-lets. Please contact MSI for inquiries about other schedule/pressure classes.

Branch Outlet Sizes
Run Sizes Available 18 14 38 12 34 1 114 112 2 212 3 312 4 5 6
38 38 12 12 34 1 114 112 2 212 3 312 4 5 6
12 12 134 34 1 114 112 2 212 3 312 4 5 6 8
134 134 212
114
1 112
114
112 2 212 3 312 4 5 6 8 10
212
114
212
114
36–3 112
114
212
2
2 212 3 4–312 4 5 6 8 10 14–12
36–3 36–3 flat 212
2
5–3 212 312
3
4–312 5 5 6 8 10 12 16
flat flat   8–3 12–6 312
3
5–4 6–5 6 6 8 10 14–12 14 18
      36–10 36–14 5–4 8–6 12–8 10–8 8 10 14–12 20–16 18–16 22–20
      flat flat 10–6 18–10 24–14 18–12 12–10 14–12 20–16 22 22–20 28–24
          36–12 36–20 36–26 36–20 18–14 20–16 36–24 36–24 28–24 36–30
          flat flat flat flat 36–20 36–24 flat flat 36–30 flat
                  flat flat        

 

O-let Styles

There are three common styles of O-lets: weldolet, threadolet, and sockolet.  They are given their name by the manner in which they connect to the branch pipe.  The weldolet has a buttweld connection, the threadolet has a threaded connection, and the sockolet has a socket weld connection.  In addition to these three common styles, there are also elbolets, nippolets, laterolets, and MSI can offer these as well.

Branch

Manufacturers

Approved Branch Fittings Manufacturers

Country

Bonney Forge

Canada/Italy

Capitol Camco

USA

Phoenix Forge

USA

IMF

USA