ASME Code Heads for Pressure Vessels

Pressure vessels are sealed vessels that bear gas or liquid pressure internally or externally and have high safety requirements. Pressure vessels are mainly cylindrical, and a few are spherical or other shapes. Cylindrical pressure vessels are usually composed of parts and components such as cylinders, heads, pipes, flanges, etc. The higher the working pressure of the pressure vessel, the thicker the wall of the cylinder should be.

ASME specifications are recognized by more than 100 countries around the world. Manufacturing, repairing or modifying pressure equipment in accordance with ASME specifications helps manufacturers enter the market smoothly. The ASME certification mark on pressure equipment allows manufacturers to communicate with business partners, end users and regulatory authorities more confidently. The certification mark is an acceptance mark indicating that the equipment complies with the ASME specifications.

The dish heads made by Dingjin used in ASME pressure vessel need to be purchased, manufactured and inspected in accordance with the code

Various ASME code dished heads formed by Dingjin for pressure vessel are generally manufactured by hammering, stamping, rolling or explosive forming. Hemispherical and elliptical heads are usually manufactured by stamping. Large hemispherical heads can also be first stamped into spherical petals and then assembled and welded. Disc heads are usually hammered, stamped or explosively formed, and the folded edge can be rolled or hammered.

Analysis from the manufacturing process , the deeper of the dish head, the larger of the diameter and wall thickness, the more difficult it is to manufacture, especially when high-strength steel is selected. The integral stamped hemispherical head is not as easy to manufacture as the elliptical head. The elliptical head must have a geometrically correct elliptical surface mold and is manufactured by manual hammering. The elliptical head has great manufacturing flexibility. The cone top part of the conical head is difficult to roll. When the cone top angle is small, in order to avoid manufacturing difficulties and reduce the cone height, a combined head (such as adding a spherical top) can sometimes be used.

Personnel selection:

Choose welders who have received professional training and hold relevant qualification certificates to ensure the professionalism and safety of welding operations ASME code heads for pressure vessel.

Technical selection:

According to the specific material, thickness and project requirements of the head, flexibly select automatic welding or manual welding methods; during the welding process, finely adjust key parameters such as welding current, voltage, speed, etc. to ensure welding quality. In addition, it is necessary to follow the sequence shown in the figure for positioning welding and accurately control the position of the welding point.

Environmental selection:

Choose a dry, windless, and suitable temperature environment for welding to avoid bad weather affecting the welding quality. At the same time, attention should be paid to protecting the surface of the head to prevent scratches or damage to the head during welding.

Post-weld treatment:

After welding is completed, X-ray detection, ultrasonic detection and other means should be used to perform non-destructive testing on the weld to ensure the quality of the weld. For heads of specific materials, post-weld heat treatment is required to eliminate welding stress and improve the overall performance of the joint.