Torispherical Head ASME

ASME standard torispherical head formed by Dalian Dingjin refers to a torispherical head that conforms to the standards of the American Society of Mechanical Engineers (ASME). The features of ASME torispherical head are as belows:

Advantages

1. It is easy to manufacture and has high production efficiency; it is low in cost and suitable for mass production;

2. If the dished head has the same inner diameter and the same plate thickness, the dished head has a smaller cutting size than the standard elliptical head, which can save materials.

3. Since the curvature of the dished head is 2:1 smoother than that of the elliptical head, it is easy to install fixing plates and brackets on the head.

Disadvantage

The mechanical properties are not as good as those of the elliptical head and the hemispherical head, but it can be used as an alternative in some cases; however, due to uneven stress distribution, there may be a problem of large edge stress.

The circumference of the head directly affects the size of the joint with the cylinder. If the circumference of the head is too large, there will be obvious unevenness when welding. If the circumference is too small, it cannot be welded. So how is the circumference of the head determined in the ASME standard?

Generally, the outer circumference of the head and the cylinder is still based on the inner diameter, which is determined by the technical agreement of the order between the supply and demand parties.

After trimming the head with the outer circumference as the docking reference, the outer circumference is measured with a tape measure at the end of the straight edge part. The tolerance of the outer circumference should meet the requirements of the ASME specification. The design value of the outer circumference is calculated as π*Do or π(2δs+Di), where π is 3.1416.

When the nominal diameter DN or the steel thickness δs exceeds the ASME specification, the tolerance of the outer circumference is determined by the supply and demand parties in the technical agreement of the order.

After trimming the head with the inner diameter as the docking reference, four inner diameters with equal distances are measured on the straight edge part and the average value is taken. The inner diameter tolerance shall comply with the requirements of the ASME specification.

When the nominal diameter DN or steel thickness δs exceeds the ASME specification, the inner diameter tolerance shall be determined by the supplier and the buyer in the ordering technical agreement.

The tolerance of the ASME torispherical head plays a very important role in the manufacturing process of Dalian Dingjin. It has the following functions:

Ensure that the parts meet the specifications:

Tolerances are set in advance during the design process to ensure that the parts produced meet the specifications. By setting tolerances during design, certain deviations in production can be allowed without causing the parts to be unusable or fail to meet the specifications.

Reduce production costs:

In the production process, it is very difficult and expensive to strictly require that all parts meet the specifications exactly. By setting tolerances during design, some deviations in production can be accepted within a certain range, thereby reducing production costs.

Improve production efficiency:

By setting tolerances during design, the error rate in the production process can be reduced, thereby improving production efficiency. For example, by setting tolerances, workers can more easily match parts during assembly, reduce the need for adjustments or replacements, and thus save time and resources.

Improve product quality: During the manufacturing process, tolerances can control the quality of parts and reduce quality problems caused by deviations during the production process. By setting appropriate tolerances, the quality of the parts produced can be ensured to be at the highest level.