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Introduction to Double Dummy Leg Pipe Fitting

What is a Double Dummy Leg Pipe Fitting? A dummy leg is a piece of pipe that acts as a support branch between your pipe and a nearby support point. It is generally either smaller than or the same size as the pipe you’re supporting. By welding these extra pieces to your pipe run’s elbow, you essentially add a support wedge that fortifies a vulnerable point in your pipe system. A double dummy leg pipe fitting is a type of pipe fitting that includes two extended sections, or "dummy legs," which protrude from the main body of the fitting. DUMMY ELBOW FITTING Double Dummy Leg fitting Why Use a Dummy Leg? The most common way to use a dummy leg is to…

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What is a Double Dummy Leg Pipe Fitting?

A dummy leg is a piece of pipe that acts as a support branch between your pipe and a nearby support point. It is generally either smaller than or the same size as the pipe you’re supporting. By welding these extra pieces to your pipe run’s elbow, you essentially add a support wedge that fortifies a vulnerable point in your pipe system. A double dummy leg pipe fitting is a type of pipe fitting that includes two extended sections, or “dummy legs,” which protrude from the main body of the fitting.

Why Use a Dummy Leg?

The most common way to use a dummy leg is to add support at unprotected elbows. Sometimes your pipe runs will end up with elbows that extend past their supports. It can be dangerous to have elbow joints sticking out and hovering because these areas are also where liquids are forced to switch directions—making them high pressure points. 

By welding a dummy leg to the back of your pipe elbow, you add a support point that helps absorb pressure and fight gravity that otherwise may pull your pipe joint apart. 

What’s the Difference Between a Dummy Leg and Trunnion?

These two terms are commonly mentioned in the same breath, the are a dummy leg and a trunnion. but don’t be fooled. So what’s the difference between them? There are a few differences between these two pipe supports: 

Schematic drawing of trunnion
Schematic drawing of trunnion
Schematic drawing of dummy leg
Schematic drawing of dummy leg

Trunnions

Trunnions usually take the form of two pieces of pipe that you weld to a vertical run. For instance, if you have vertical piping that you need to secure, you can weld trunnions to the sides of your vertical pipe. That way, your pipe isn’t flexing or wobbling in a way that puts it in danger of wear or ruptures. 

Trunnions

Dummy Supports

By contrast, a dummy support consists of a full piece of pipe that you weld to the back of an elbow. It props up your elbow and forms a bridge between the point where your pipe run changes direction and your closest support.

DUMMY ELBOW FITTING (5)

Uses of Double Dummy Leg Pipe Fitting

Double dummy leg pipe fittings are commonly employed in scenarios where extra reinforcement and support are required. They are often utilized in piping systems subject to thermal expansion, high pressure, or other stress factors. Additionally, these fittings can serve as convenient attachment points for instrumentation, insulation supports, or other accessories

Precautions when Using Double Dummy Leg Pipe Fitting

When utilizing double dummy leg pipe fittings, it is important to consider several precautions to ensure their effective and safe operation. Proper installation and alignment of the dummy legs are crucial to their functionality. Additionally, the material and design of the fittings should be selected based on the specific requirements of the application, taking into account factors such as temperature, pressure, and environmental conditions.

By adhering to these precautions, double dummy leg pipe fittings can effectively enhance the stability and reliability of piping systems in diverse industrial settings.

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