How to determine the quality of graphite-made equipment

How can one determine the quality of equipment made from graphite? 1. Examine the company’s qualifications, focusing primarily on whether it holds a design qualification certificate for A4 class non-metallic (graphite) pressure vessels and whether it has a manufacturing qualification certificate for such vessels. 2. Look at the raw materials, mainly focusing on the graphite material, impregnating resin, and sealing material. 3. Examine the processing techniques, focusing mainly on the impregnation process, bonding process, and mechanical processing process. 4. For performance verification in actual operation, the key aspects to consider include chemical resistance, heat shock resistance, resistance to extreme low and high temperatures, pressure resistance, overall heat transfer efficiency (for heat exchangers), uniformity of liquid distribution (for absorbers and towers), and pressure drop across the material flow. 5. Consider the pre-sales and after-sales services. Pre-sales services involve initial technical discussions, process calculations, and recommendation of suitable models. After-sales services include guidance on equipment installation upon delivery, commissioning of the equipment, staff training, supply of spare parts, handling of on-site issues, and the competence of the service personnel.

The manufacture of graphite equipment shall comply with the provisions of HG/T 2370-2005 \"Technical Requirements for Graphite Chemical Equipment\", which mainly include: (1) Mechanical properties of the main graphite materials; (2) Mechanical properties of adhesives used for bonding (in the case of adhesive joints); (3) Results of pressure test evaluations; (4) Additional items required in accordance with GB150 when steel pressure components are present; (5) Items that do not conform to HG/T 2370-2005 and the drawings