ASME – Elliptical Tank Heads
Customized size
2:1 Ellipsoidal Head
difference between torispherical head and Elliptical Head
Realiable quanlity
Affordable price
2:1 Ellipsoidal Head: Precision Meets Functionality
When it comes to pressure vessel design, the shape and structural integrity of the head play a crucial role in ensuring performance and safety. Among the various head types, the 2:1 Ellipsoidal Head stands out as a preferred choice, combining efficiency, durability, and ease of fabrication. Let’s explore what makes this design so distinctive and why it is a cornerstone in modern engineering.
An ellipse, at its core, is a mathematical shape characterized by a unique property: the sum of the distances from any point on the curve to two fixed points (foci) remains constant. This principle is what gives elliptical structures their distinctive shape. When applied to the design of heads for pressure vessels, the ellipse provides a geometric basis that balances strength and material efficiency.
A standard ellipsoidal head features a major and minor axis. The major axis has a smaller radius, while the minor axis has a larger radius. However, fabricating a true ellipse with varying radii at every point is both challenging and costly. To address this, the American Society of Mechanical Engineers (ASME) introduced the simplified 2:1 Ellipsoidal Head design, which offers a practical alternative that closely approximates a true ellipse while meeting stringent engineering standards.
The ASME 2:1 Ellipsoidal Head is a torispherical shape with specific proportions:
Crown Radius (L): 90% of the internal diameter (ID) of the vessel.
Knuckle Radius (r): 17% of the internal diameter (ID).
These dimensions provide an optimal balance between strength and manufacturability, making the design highly effective for applications requiring pressure containment.
In the metal forming process, maintaining the minimum required thickness is critical to ensure the structural integrity of the head. This is especially important as forming processes, particularly in the knuckle region, can lead to material thinning due to fiber elongation.
Factors Influencing Thickness:
Fiber Elongation: Smaller radii result in higher elongation, leading to more stretching and reduced thickness.
Thinning Allowance: While shell forming doesn’t typically require additional thinning allowance, head forming does. Designers must account for this to ensure the final thickness meets safety and performance standards.
The ASME code specifies the following formula for calculating the minimum required thickness of the head after forming:
Where:
t: Minimum required thickness after forming
P: Internal pressure
D: Inside diameter of the head
S: Maximum allowable stress for the material
E: Joint efficiency
The nominal thickness is chosen such that, even after thinning during the forming process, the final thickness exceeds the required minimum.
The design must satisfy specific ASME conditions:
These guidelines ensure the head maintains its structural integrity under operational pressures.
Strength and Efficiency: The shape’s inherent properties evenly distribute pressure, reducing stress concentrations.
Material Savings: Its efficient design minimizes material use compared to other head shapes, like hemispherical heads.
Ease of Fabrication: Simplified geometry ensures manufacturability without compromising performance.
The 2:1 Ellipsoidal Head is widely used in industries such as:
Chemical and petrochemical processing
Power generation
Food and beverage processing
Pharmaceuticals
Its versatility and reliability make it an indispensable component in pressure vessel design.
The 2:1 Ellipsoidal Head represents the perfect blend of engineering ingenuity and practicality. By leveraging the principles of geometry and adhering to ASME standards, this design ensures safety, performance, and cost-efficiency in pressure vessel applications. Whether you’re designing a vessel for industrial use or a specialized application, the 2:1 Ellipsoidal Head is a choice you can trust.
Company information
Haipei industry can produce all types of dished ends heads. They can be manufactured from a number of steel types including pressure vessel and boiler quality, chrome moly and stainless steel. The company also offers 2:1 semi ellipsodial, hemispherical petals, torispherical ends as well as conical knuckled sections.
Haipei industry company is a leading producer of various types of dished heads, cones, and other special pressed products in different materials grades like Carbon Steel, Stainless Steel, Duplex, Super Duplex, Aluminum, Nickel and Nickel Alloys, Copper and Copper Alloys, Titanium and Its Alloys, Zirconium and all cladded material combinations.
Our Services
We offer our products in the following materials:
Carbon Steel: SA36, SA516-70, SA387 Grade 5 Class 2 (Forming Only), SA285 Grade C (Forming Only)
Stainless Steel: SA240T304/304L, SA240T316/316L, SA240T304H (Forming Only), SA240T904/904L (Forming Only)
Copper: O-Temper Material (Forming Only)
Aluminum: O-Temper Material (Forming Only)
Quality assurance
Quality is the most important aspect of strength.We will make the material from the material to the end of the monitoring, making sure that each part can be of high quality according to the regulations.Each program will be monitored to ensure any errors in the manufacturing process.
Competitive price guarantee
With years of experience, we can offer our customers the most competitive prices.At the same time, as a powerful factory, we can offer customers more favorable prices than other factories.
Delivery time guarantee
We will strictly control the manufacturing schedule to ensure punctual delivery.It can satisfy the customer's time schedule and ensure the continuous production of customers.
Packaging & Shipping
Carbon steel Hemispherical spherical head for Industrial hot blast stove
1. Iron Frame2. Wooden Box3. Iron pallet4.Wooden pallet.5.Professional fixation6. Curstomed requirment
FAQ
Q: What’s the information should I provide when inquiry?
A: Thanks for your question. If you have drawings, we will be entirely in accordance with production drawings . If you do not have the drawing, you can tell me the product data. There are several important data, such as material, type of head( We have elliptical head, hemispherical head, dished head, flat head, etc. ),diameter, thickness, special tolerances or requirements. We can do the drawings according to your requirements, and you confirm that the final product drawings.
Q: what are surface treatment of the product?
A:Thanks for your question. For carbon steel products, we sandblasting descaling product surface. For stainless steel products, we use acid to remove surface oil and impurities.
Q: How do you ensure the quality of products?
A: Thanks for your question.Our production staff is trained through national quality department, and obtain the corresponding certificate, with years of production and design experience. Weld must undergo X-ray inspection to ensure that no defects.
Q: Can you help us matching related products?
A: Thanks for your question. Our company also is surrounded by a lot of ancillary businesses, such as flanges, boiler, oil refining equipment, etc. We can help you matching the highest quality products with the lowest prices .
Contact us
Contact: Frieda
Phone: +86 182 6483 8918
E-mail: [email protected]
Add: No.76,South.Road,Daiyue District,Tai'an,Shandong Province
