Jiangyin Hengye Forging Co., Ltd

Where can you forge forgings for pressure vessels?

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Where can you forge forgings for pressure vessels?

In the calculation of forgings for stationary pressure vessels, the axial stress of the shell, the axial stress of the heat exchange tube, and the pull-off force q between the heat exchange tube and the tube sheet are calculated according to various working conditions with temperature difference. When strength (or stability) conditions cannot be met, expansion joints are required. In the strength check calculation of fixed pressure vessels, when the thickness of the pressure vessel is determined, sometimes the strength of the pressure vessel without expansion joints is not enough, and the thickness of the tube sheet after setting the expansion joints may meet the requirements. At this time, expansion joints can also be set to make the tube sheet thinner, but this depends on the comprehensive evaluation of material consumption, manufacturing difficulty, safety and economic effect.

With the enlargement of chemical equipment and power stations, the diameter of pressure vessel forgings is getting larger and larger, and it is not uncommon for Yali velvet with a diameter of 4m-5m to expire. Large pressure vessel forgings have the characteristics of large number of holes, high density, small diameter and depth of holes, and high requirements for precision and flatness.

Forgings for pressure vessels are widely used in shell and tube heat exchangers, boilers, pressure vessels, steam turbines, large central air conditioners and other industries.

Mainly used in chemical containers, such as shell and tube heat exchangers, pressure vessels, boilers, condensers, central air conditioners, evaporators, seawater desalination, etc., to support and fix pipes and tubes. Metal materials are not only rigid, but also have good thermal conductivity.

Depending on the environment, different materials are used. Generally, Q345R container plates are used, such as primary and secondary pressure vessels. Non-corrosive media can be circulated, and carbon steel clad plates can be used. When encountering strong acid, high pressure and high temperature, nuclear energy and other environments, corrosion-resistant materials such as stainless steel, 16 manganese, and titanium alloys are required. The application of new synthetic materials will bring new vitality to tube sheet products.

Tubesheets used in Type III and Type IV pressure vessels require high precision. The traditional processing method of holes is locksmith scribing, radial drilling and drilling. With the expansion of chemical containers, the diameter and thickness of tube sheets are also increasing, and CNC technology has also been introduced in tube sheet processing, and CNC drilling machines are widely used to lead holes and shakers. Arm drill for hole processing. The use of machining centers for high-efficiency and high-precision hole machining has gradually been accepted by some large enterprises. There is an increasing demand for heavy-duty tube sheets in fields such as nuclear power, seawater desalination, and central air-conditioning heat exchangers.

In the process of pressure vessel inspection, the main inspection indicators are hole position, hole diameter tolerance, hole finish, whether there is burr, undercut position, etc. For double tube sheets, the hole position is more important in the inspection process, and the matching degree of the two tube sheets at the hole position is very important. General CNC drilling machine can guarantee. Holes above 300mm and hole perpendicularity are very important compared to thick plates. These large-diameter thick plates require more sophisticated tools and equipment, and the application of dedicated gantry machining centers will become more and more common.

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