What should be noted regarding the installation of process pipelines

(l) The clear height and clear distance for the layout of above-ground pipelines shall comply with the provisions in Chapter 8 of the Code for Design of Industrial Metal Pipelines GB 50316–2000. (2) The installation of pipe supports and hangers shall be carried out in accordance with the provisions regarding the maximum allowable spacing between supports and hangers specified in the **current standards. (3) Pipelines should be installed overhead, and their layout should be neat and orderly. If necessary, it can also be laid underground or in trenches. (4) The piping layout shall meet the requirements for easy operation, installation, and maintenance, without affecting the operation of the crane. Pipes should not be installed within the hoisting hole area of the building. Pipes should not be installed in the area where the equipment internals are removed and in the area where the equipment flanges are detached. (5) The pipeline layout should take into account the design of supports and hangers, so as to place the pipelines as close as possible to existing buildings or structures, while avoiding subjecting components with high flexibility to excessive loads. (6) Where conditions permit, the pipes should be arranged in rows. The bottom of the bare tube is aligned with the bottom of the tube support to facilitate the design of the bracket. (7) Pipes without an insulating layer do not require pipe supports or brackets. Large-diameter, thin-walled bare pipes and pipes with insulation layers should be supported by pipe supports or brackets. (8) Pipes above roads and railways shall not be equipped with components that may cause leakage, such as valves, flanges, threaded joints, and compensators with packing. Pipes for corrosive liquids should not be arranged above rotating equipment. (9) When pipes pass through safety isolation walls, sleeves should be used, and the gaps within these sleeves should be filled with non-metallic flexible materials. The welds on the pipe shall not be inside the sleeve, and shall be at a distance of not less than 100 mm from the sleeve port. Rainproof measures should be in place where pipes pass through the roof. (10) The main pipes for fire water and cooling water, as well as the drainage pipes, are generally laid underground; the outer surfaces of these pipes shall be protected against corrosion in accordance with relevant regulations. (11) The impact of vehicle loads should be taken into account for buried pipelines; sleeves should be used when they pass through roads, the distance between the top of the pipeline and the road surface should not be less than 0.6 m, and the pipeline should be located below the depth of permafrost. (12) For pipes with requirements such as “bagless”, “with slope”, and “with liquid seal” ； Piping should be installed in accordance with the requirements of the PID. (13) When branching off a branch pipe from a horizontal main gas pipe, it should be connected from the top of the main pipe. (14) The spacing between parallel pipes and the installation space shall meet the following requirements: 1) The clear distance between parallel pipes shall satisfy the needs for pipe welding, installation of insulation layers, and maintenance of components. The clear distance between the protrusions on the pipe should not be less than 25 mm. For example, the clear distance between the outer edge of the flange and the outer wall of the insulation layer of the adjacent pipe, or the clear distance between flanges, etc ； 2) The distance between pipes that are not insulated and do not have flanges should meet the requirements for pipe welding and inspection, and should not be less than 50 mm ； 3) For pipes with lateral displacement, the clear distance between pipes should be increased appropriately ； 4) The protruding part of the pipe or the outermost part of the pipe’s insulation layer shall have a clear distance of not less than 100 mm from the supports of the pipe rack or framework, as well as from the walls of buildings; this distance should also take into account the space required to tighten the flange bolts. (15) The installation of exhaust and drainage outlets shall meet the following requirements: l) Exhaust and drainage outlets shall be provided at the high points or low points resulting from the piping layout. The minimum diameter of the exhaust outlet at high points is DN 15 mm, while the minimum diameter of the drainage outlet at low points is DN 20 mm; however, when the main pipe has a diameter of DN 15 mm, drainage outlets with the same diameter can be used. The minimum pipe diameter for the exhaust and discharge ports of high-viscosity media is DN25mm. ； 2) The exhaust and drainage ports required by the process (including those connected to the equipment) shall be installed in accordance with the requirements of the PID ； 3) The height requirement for the exhaust outlet shall comply with the provisions of the current **standard, the Code for Fire Protection Design of Petrochemical Enterprises GB 50160 ； 4) The discharge points of pipelines for toxic and flammable/explosive liquids must not be connected to the sewer system; instead, they should be connected to a closed discharge system. The venting points for gases heavier than air should take into account the impact on the operating environment as well as the protection of personal safety. (16) The thermal (cold) compensation of the pipeline shall meet the following requirements ； 1) Displacement of pipes caused by thermal expansion or contraction. Force and torque must be carefully calculated, with priority given to utilizing the natural geometric shape of the pipe layout to absorb them. The forces and torques acting on the equipment or pump connections must not exceed the allowable values ； 2) When the self-compensation capacity of the pipeline is insufficient, compensation elements such as \"Π\"-shaped elbows, bellows expansion joints, or other types of compensators should be installed at appropriate locations in the piping system. Support frames and guide frames should also be provided in accordance with standard requirements ； 3) When it is necessary to reduce force and torque, cold drawing can be employed, but it should not be used for the connections of important and sensitive machines and equipment. (17) The position of the circumferential welds on the pipe shall meet the following requirements: 1) The distance between two butt welds shall not be less than 3 times the wall thickness of the pipe; when post-weld heat treatment is applied, it shall not be less than 6 times the wall thickness, and must also be at least 50 mm. For pipes with a nominal diameter of 50 mm or more, the distance between the welds shall be at least 100 mm ； 2) The circumferential welds of pipes should not be located within the range of pipe supports; the clear distance between the edge of the weld and the edge of the support should be more than 5 times the width of the weld, and at least 100 mm. ； 3) It is not advisable to make holes or attach pipes at the welds and their edges of pipelines ； 4) The bending radius of the pipes when bent on site should not be less than 3.5 times the outer diameter of the pipe ； The distance from the weld to the starting point of the elbow shall be not less than the outer diameter of the pipe, and also not less than 100 mm.

Which aspect should I point out? Is it a construction plan or a construction organization plan? Cost estimation again, or schedule planning? That’s too macroscopic. It’s better to hire a PMC.

Reply to 1# keep_8025: That’s right, clearly state what you know so that appropriate actions can be taken

Construct according to the diagram. Don’t think too much about it.