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I have been on site recently and have encountered some issues related to manufacturing; combined with the problems I faced in terms of design, I have summarized them roughly and put them together in this article. Many things are known to those involved in design, manufacturing, and installation, so they won’t be explained in detail; only brief mentions will be given, focusing on areas that are prone to being overlooked. If there are any mistakes, I hope everyone can point them out promptly! Thank you! There are also some areas that haven’t been sorted out yet; if anyone has any suggestions, I can include them in the edit. ———————————————————————————— I. The classification of pressure vessels must be accurate. Equipment operators should have a general understanding of the process flow; it is advisable to be familiar with the P*I*D parameters of the process and to know the flow direction of the process media, especially considering their toxicity and flammability/explosivity. For example, even trace amounts of iodomethane can raise the category of the equipment. Taking a CO2 gas generation furnace as an example, the parameters are: Φ2740, with a water jacket; the operating pressure inside the furnace is 0.03 Mpa, the operating pressure of the steam in the water jacket is 0.16 Mpa, and the water pressure in the steam drum is 0.1 Mpa. Design temperature: 1200°C inside the furnace, 139°C in the jacket. Design pressure: 0.04 Mpa inside the furnace, 0.34 Mpa in the jacket. This device was discussed many times with the manufacturer, who initially thought it belonged to one category. Confirmation steps: 1. Confirm the type of container: waste heat boiler (according to Note 6, Article 6, Paragraph 1 of the container regulations) ； 2. Category confirmation: Class II (according to Article 6, Paragraph 4 of the capacity regulations). II. Nozzle orientation diagram II. Nozzle orientation diagram Horizontal containers do not require a nozzle orientation diagram; the drawing shall indicate “as shown in this diagram”” ； The vertical container drawings indicate “see the pipe connection diagram”; the equipment drawings do not specify angles, otherwise the manufacturer would produce it based on the equipment construction drawings (such laxities occur from time to time). The contents included in the pipe opening layout diagram (selected depending on the equipment) are: (1) all pipe openings (nozzles, manholes, handholes, light holes, sight glass ports, etc.) ； (2) All openings in the cluster seats ； (3) Position of the lifting lugs and lifting posts (the positions of the upper and lower lifting lugs should differ by 90º) ； (4) Position of foundation bolts ； (5) Position of tray installation, position of support beams ； (6) Orientation of the guide plate when ear bracket supports are used (for tower equipment) ； (7) Position of the heat exchanger baffle (left/right, upper/lower notches) ； (8) The drain port and exhaust port of the heat exchanger (this is often overlooked! ). Azimuth map review (1) Calculate if the distance between the two holes (in terms of arc length) meets the requirements when necessary ； (2) The flanges of two adjacent pipe ends must not collide ； (3) The pipe outlet should be kept away from supports and legs ； (4) Be careful that the pipes beneath the horizontal container do not touch the foundation ； (5) Be careful to avoid conflicts between the pipe openings and the platform ； (6) In the case of vertical storage tanks equipped with foam buffer pipes (for flammable media), there must be no openings around the buffer pipes, and no pipe ends should face them ； (7) The anchor bolts should be kept away from the pipes extending from the base plates ； (8) Top suspension rod and sling; the sling should extend 400 mm beyond the outermost layer of the platform support beam ； (9) The positions of the upper and lower lugs on the tower equipment should be 90º apart; it is also possible to have two lower lugs.