ASME 2 1 Elliptical Head

The mouth of the elliptical head is still circular, but its cross-section is elliptical, and the elliptical head we often use adopts the ratio of positive half 2:1. It is divided into EHA head based on the inner diameter and EHB head based on the outer diameter, which are collectively referred to as elliptical heads.

Elliptical heads are essential key components in pressure vessel equipment in many manufacturing industries such as petrochemical equipment, atomic energy, food, and pharmaceuticals. The elliptical head is the bearing end cover on the high-pressure vessel and is a key pressure-bearing component of the high-pressure vessel. The quality of the elliptical head is related to the long-term and reliable operation of the high-pressure vessel.

1. The deformation of the elliptical head is caused by the inconsistency between the large piece of the disc and the actual thickness of the joint itself, the uneven pressure force during stamping, or the uneven heat and cold during heat treatment. The principle of thermal expansion and contraction can be used to heat the deformed head, and then quickly cool it with water, or it can be corrected by spinning.

2. The scratches on the elliptical head are mainly caused by improper operation during transportation. For example: hook scratches, forklift scratches. Solution: First, pad the protective film on the contact surface between the hook and forklift and the head. After scratches, grind them. If the scratch area exceeds 25%, it must be treated as a whole.

3. Regarding increasing the thinning rate of the elliptical head, the uniform thickness of the formed head can avoid stress concentration and increase the service life of the head. The processing allowance is determined according to the manufacturing process to ensure that the thickness of the 2:1 elliptical head and the hot roll section after forming is not less than the nominal thickness of the component minus the negative deviation of the steel plate.

Our customers reported that the heads provided by previous suppliers had an "orange peel" phenomenon. Most of the "orange peel" phenomena cannot be observed by the naked eye. They can only be discovered during the stamping and drum pressing process. This is mainly caused by the delamination of steel plates. Since its establishment, Dalian Dingjin has established long-term cooperation with agents of major domestic steel mills, such as Wuyang Iron and Steel Co., Ltd., which produces carbon steel, Shanxi Taigang Stainless Steel Co., Ltd., which produces stainless steel, and Sichuan Jinglei Technology Co., Ltd., which produces cladding plates.