Brief Introduction
The elliptical head formed by Dingjin with a ratio of the major axis to the minor axis of the rotating ellipsoidal generatrix of 2.0 is usually called a standard elliptical head.
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Features |
Description |
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Force-bearing performance |
The shape of the 2:1 elliptical head is regular, the change of the meridian curvature is smooth and continuous, and the stress distribution is uniform, so it has good force-bearing performance. |
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Manufacturing process |
The manufacturing process is relatively simple and the cost is low, which can meet the needs of large-scale production. |
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Volume efficiency |
Compared with other types of heads, it can provide a larger volume at the same economic cost. |
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Load-bearing capacity |
The structure is more solid, can withstand greater external forces, and has a stronger load-bearing capacity. Sealing performance It has good sealing performance and can effectively resist the influence of internal pressure and external environment. |
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Welding performance |
Excellent welding performance, easy to install and maintain. |
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Sealing performance |
It has good sealing performance and can effectively resist the influence of internal pressure and external environment. |
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Material selection |
There are a variety of materials, including stainless steel, carbon steel, etc., and suitable materials can be selected according to the requirements of the engineering environment and medium. |
Parameter
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Type |
Elliptical Head |
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Manufacture Standard |
As per ASME Ⅷ-1,2023 UG79, &UG81 |
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Inner Diameter |
513mm |
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Min Thk. A/F |
18mm |
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Straight Flange |
50mm |
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Cutting Method |
Gas Cutting |
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Forming Method |
Cold Forming |
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Heat Treatment |
Not Required |
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Material Designation |
304 |
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Material Standard |
As per ASME II-A,2023 |
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Surface Treatment |
Sand Blasting |
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NDT Method & Acceptance Creteria |
Not Required |
Function Of Straight Edge
Strengthen structure:
The straight edge can increase the strength and stability of the 2:1 elliptical head, and prevent deformation or rupture caused by excessive pressure.
Easy to connect:
The straight edge makes it easier to connect the head with pipes or other equipment, improving installation efficiency.
Improve sealing performance:
The straight edge helps to improve the sealing performance of the head and prevent leakage.
Aesthetics:
The straight edge can make the appearance of the head more neat and beautiful.
Application Notes
When the hoop stress is , compressive stress will begin to appear in the transition zone of the elliptical head. If the ratio of the major axis to the minor axis continues to increase, the compressive stress value at the edge of the transition zone of the elliptical head will increase rapidly, that is, the shallower the head, the higher the compressive stress value at the edge of the head. Therefore, it is more reasonable to limit the ratio of the major axis to the minor axis of the elliptical head to within 2.6. In addition to meeting the strength requirements, the thickness of the head should also meet the elastic instability under internal pressure due to the compressive stress in the transition zone of the head for large diameter and thin wall elliptical heads. Therefore, Dalian Dingjin pay more attention to the thickness of the elliptical head which should also meet the stiffness requirements.
