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Rectangular Metal Expansion Joints and Round Metal Expansion Joints in CTA Company are fabricated to the CE standard, the EJMA standard and other each kind of Non-Standard profile also to the customer specified dimensions with standard convolution profiles, and a variety of corner configurations which is able to meet your needs and also can provide the random section for you.
Materials of construction range from carbon steel to stainless steel and high nickel alloy steels. Rectangular Metal Expansion Joints and Round Metal Expansion Joints are leak tight and typically last 15 years or more.

The standard convolution profiles including V-profile and U-profile

V-profile convolutions are prolific because they can be easily made with a 60 ton break-press. The design flaw involves the angle of the side wall. When the ‘convolution’ compresses it wants to grow taller, but can't. The rail is fixed at the corner to the next side, which wants to grow taller and pull away. The corner bears the brunt of this displacement. And,unfortunately, that's right where the weld resides.

The U-profile has side walls that are parallel that start in a neutral position so when they swing inward the change in height is reduced by HALF. That makes a huge reduction in the stress levels. Pre-set that same U-profile 50% and the height change is only 15% of a V- profile.

A round corner is the cure

The weld on a miter corner is where the stresses are focused. A round corner spreads out that stress a gets the welds out of the high stress area.

The published stress equations in the EJMA standards do not adequately address the design flaw of a V-span profile or the inadequacies of the corner welds.

Can say a V-profile are working well? Then they are not seeing the full design conditions. If the V-profile really compressed the full rated motion, they'll crack in the corners. Sure, a V-profile is still more flexible than straight ducting but is always less flexible than a round corner U-profile.

The cost is close

	V-profile are inexpensive to fabricate because they do not require special tooling. If somebody has already invested in the tooling then the cost comparisons are surprisingly close. So, the results is U-profiles with round corners work are work very well. They’re superior, dependable. It's an excellent design.

Characteristics

Pressure	Vaccum-0.1MPa
Temperature	－40℃～450℃
Dimensions	All dimensions
Convolution Profile	CE Profile; U Profile; V Profile; UV Profile
Material	Stainless Steel, Carbon and high nickel alloy steels
Thickness	Thickness up to 3 mm
No of Folds	Single Fold; Double Folds; Three Folds

Application

Rectangular Metal Expansion Joints and Round Metal Expansion Joints are designed to compensate for thermal expansion in duct systems, turbines, precipitators, condensers, scrubbers, boiler breeching and other gas systems which are used for absorbing the displacement such as axial movement, lateral deflection and angular rotation and anti-vibration.