2-Ply Testable Bellows For Steam Turbines

2-Ply Testable Bellows

August 1, 2014

Many users such as power plants and refineries have expansion joints with 2-ply testable bellows. These redundant bellows are often overlooked during the piping system inspection. A demonstration is provided with a recommended test fixture for safe and easy testing between the bellows plies. This is a video that is of interest to maintenance engineers

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Van Stone Flanges

Van Stone Flanges

August 1, 2014
Van stone flanges enable ease of installation and provide a corrosion barrier between the media and the flange. This is a video that is of interest to design and maintenance engineers, pipefitters, and contractors. Length: 2.29 Read More
Steam Extraction Expansion Joints

Steam Extraction Expansion Joints

August 1, 2014
The expansion joints down in the LP turbine are rarely inspected due to limited access to the covered metal bellows. Inspection and replacement recommendations are discussed. This is a video that is of interest to maintenance, steam and turbine engineers, and inspectors. Length: 7:16 Read More
Do You Need An EJMA Manual

Do You Need An EJMA Manual

August 1, 2014
An overview of the EJMA manual contents is given along with tips and recommendations for those seeking expansion joint information. This is a video that is of interest to design, piping, vessel and maintenance engineers along with buyers, pipefitters, and contractors. Length: 3:20   Read More
Understanding Bellows Internal Pressure

Understanding Bellows Internal Pressure

July 12, 2014

Understanding Bellows Pressure Capacity Simple concepts of convoluted shapes K.I.S.S. – Keep It Simple Moron Ever read a copy of Scientific American? I pretended to once. Too many words, not enough pictures. I can tell you from personal experience that it does not impress girls when you are holding a publication upside down. Give me

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Fun Facts About Stainless Steel Bellows

Why Stainless Steel Doesn’t Rust

July 12, 2014

A tale of two metals Most bellows are made from 300 series stainless steel and so that ‘wonder’ metal is worth discussing. You take the standard mixture for steel – iron and carbon, and add a little chromium and nickel, and POW! You get a steel that doesn’t rust. Both metals have a high percentage

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Torsion on Expansion Joints

Torsion on Expansion Joints in Piping Systems

July 12, 2014

Torsion on Expansion Joints in Piping Systems Understanding design Avoid bellows and torque When designing piping systems with expansion joints, try and avoid arrangements which would put torque on the bellows. For a metal bellows, torsion is usually bad. When the piping can’t be changed, there are some ways to significantly reduce torsion when expansion

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Bellows Cyclelife EJMA vs ASME

Metal Bellows Cycle Life – EJMA vs ASME

July 12, 2014

Will the real cycle life please stand up How can three well-respected codes, or design guides, not even be in the same ballpark when it comes to predicting bellows cycle life? On a recent bellows design the EJMA (Expansion Joint Manufacturers Association) curve gave a 7000 cycle rating; B31.3 gave 1150 cycles; and Section VIII/Appendix

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Going Laterally in an Axial World

Moving Laterally in an Axial World

July 12, 2014

Going in another direction Henry David Thoreau once wrote, “If a man does not keep pace with his companion, perhaps it is because he hears a different drummer,” to which his father promptly responded “Hey, drummer boy! Get your beatnik friends out of my house and go get a job!” Many types of expansion joints

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Why an Expansion Joint Works - Part 2

Why An Expansion Joint Works – Part II

July 12, 2014

The bellows exposed There’s no mystery as to why a bellows can flex – it’s convoluted for crying out loud. This could be one short article. Except here’s the tantalizing part; when the bellows material flexes, the stresses shoot well into the plastic range. At this point the collective mechanical engineering community gasps, women faint,

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Why an Expansion Joint Works - Part 1

Why An Expansion Joint Works – Part I

July 11, 2014

On the surface it doesn’t seem to make sense. If the code requires a pipe in a system to have a 3/8” thick wall to contain the internal pressure, how can an expansion joint bellows get by with just a 1/16” thick wall? Balance the Forces It’s how the material is arranged. For a pipe,

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Understanding Pressure Balanced Expansion Joints

July 11, 2014
Click to View Article A formula free explanation To explain a pressure balanced expansion joint, many an engineer will eagerly pencil out off-setting load vectors – also called the beloved free-body diagram. We engineers live and die by free-body diagrams. All the most important questions in life can be explained by free-body diagrams. As much Read More