Manufacturing process requirements and material selection of pressure vessels

Pressure vessels are pressure vessels that may have an explosion and other hazardous accidents. Pressure vessel containing medium special (flammable, explosive, toxic, corrosion, etc.) once the accident, the destruction of power, the impact is also great. In order to improve the safety of the pressure vessel, to ensure the normal production and construction, the company must carry out the production of product knowledge training.

In addition to ensuring safe operation of the pressure vessel, the pressure vessel should also meet the requirements of production process and structure, and the process of the production process can be carried out smoothly. General consideration should be given to the following basic aspects:

 1, choose the right structure of the form: the completion of scheduled production tasks. 

 2, reasonable choice of structural materials: 1. The operation conditions of the container.

 3, meet the structural requirements: the strength of the durability of the steel pressure vessel containing tolerance have the following conditions: Pw maximum working pressure greater than 0.1 Mpa (excluding hydrostatic pressure) in diameter (non circular section refers to the largest size) is larger than 0.15m, and more than 0.025 of the volume (V) containing medium for gas, liquefied gas or maximum working temperature above the normal boiling point of liquid.

Pressure vessel material

1 specification for the quality of materials used in pressure vessels shall be in accordance with the relevant national standards, industry standards. Material production units must ensure quality, according to the provisions of the relevant standards to provide quality certificate (original), the contents of the certificate of quality must be filled in, and by the quality inspection department of the production unit to confirm the seal. Material production units should be in accordance with the provisions of the corresponding material standard, make clear and strong identification marks in the specified parts of the material or other obvious place, including at least material manufacturing standard code, specifications, production of steel grade (batch), production unit name inspection stamp mark.

2 the mechanical properties, flexural properties and impact test requirements of the materials used for steel pressure vessels shall be in accordance with the relevant provisions of GB150 "steel pressure vessels".

In addition to the mechanical properties and bending properties of the pressure vessel material, the compatibility of the material should be considered. P special steel for pressure vessel should not be more than 0.030%, S content should not be greater than 0.020%.

The structure of main pressure parts for welding of carbon steels and low alloy steel pressure vessel, the carbon content should not be greater than 0.25%.

Body, head, Kong Gai, flange, manhole nozzle, manhole expansion belt, opening reinforcement ring, the pressure vessel flange tube equipment; spherical shell plate; tube plate heat exchanger and heat exchanger tube; nominal diameter of more than M36 of the equipment of the main bolt is greater than or equal to 250mm over and pipe flange are the main pressure elements.

The welding materials shall be in accordance with the corresponding standard system, inspection and selection of welding materials must have quality certificates and clear signs. Strict implementation of welding materials acceptance, inspection, storage, drying, distribution and recovery system.