2011.10.31---2011.11.06 Weekly Topic: Engineering issues related to the static grounding of pipelines
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This post was last edited by feng_200108047 on 2011-10-31 08:21. How should the responsibilities for designing the static electricity grounding system for pipelines be divided? Which field is responsible for materials used for static grounding? Which specialty is responsible for the static electricity grounding of pipes during on-site construction? (This question was provided by feng_200108047.) Reason for creating this question: In several companies where I work, many projects involve static electricity grounding, and different departments tend to shift responsibility to each other in such situations; there is a standard specifically addressing static electricity grounding. But during the design process, which specialty determines which pipelines need to be statically grounded? That department is responsible for providing the materials needed to carry out the actual construction of static grounding. Different companies have different approaches; I hope everyone can discuss this to come up with a better solution! You are welcome to propose topics for the weekly discussion; there are high prizes available. For more details, please visit http://bbs.hcbbs.com/thread-913168-1-1.html
Let me answer first. In several companies where I work, many projects involving static grounding see different departments shifting responsibility to one another; I would like to share my views on this issue first. First of all, the requirement that those pipelines be statically grounded should be proposed by the process engineering team ； There is no doubt that the specific construction methods should be designed by electrical engineering specialists. However, most materials for static grounding are currently supplied through pipes, and in my opinion it seems simpler to have the electrical engineering team handle it directly. During on-site construction, it is necessary to determine which specialty should carry out the work based on the specific form of the grounding connection. It’s just my personal opinion; feel free to discuss.
When carrying out static grounding, it was indeed the process engineering team that suggested that those pipelines needed to be statically grounded. However, the specific construction methods and certain special approaches were outlined by the piping engineering team in the construction instructions. But the materials weren’t prepared in advance; everything had to be resolved on-site, haha.
Firstly, it is proposed by the process and safety management teams; the specific materials and methods required for construction are designed by the electrical engineering team. Then, the procurement department is responsible for purchasing the materials, the construction team is tasked with carrying out the construction according to the plans, and finally, the inspection team conducts the quality checks~~~
Static grounding and bonding. The layout design is carried out by the safety team, while the material selection is handled by the electrical team. On-site construction is organized by the process department, with supervision provided by safety and electrical experts, and is carried out by electrical installation workers
This post was last edited by 39392069 on 2011-10-31 10:46: Static grounding and bonding. 1. The layout design is carried out by the safety specialists. 2. The material design is carried out by the electrical engineering department. 3. On-site construction is carried out by electrical installers. 4. It shall be supervised jointly by safety and electrical experts organized by the process department.
Common standards for static electricity grounding include: HG/T22675-1990; SH/T3097-2000; CD90B4. SH/T3097-2000 contains the following provision: 4.3.1 Pipelines shall be grounded at points where they enter or exit the plant area (including production workshops and buildings), as well as at branching points. Long-distance unbranched pipelines should be grounded every 100 meters. 4.3.2 When the clear distance between parallel pipes is less than 100 mm, a bridging wire should be installed every 20 m. When pipes intersect with a clear distance of less than 100 mm, jumper wires should be added. 4.3.3 When a metal flange is fastened with metal bolts or clamps, it is generally not necessary to install additional electrostatic connection wires, but it must be ensured that there is good electrical contact between at least two of the bolts or clamps. I suggest the following division of responsibilities: the process engineering team should inform the equipment engineering team of the conditions required for welding static grounding plates on equipment; it should also inform the pipeline installation team of the pipelines that require such grounding plates. The static grounding plates for equipment are to be included in the equipment materials, while the materials for pipeline static grounding plates and jumpers are to be listed in the comprehensive pipeline material list (as only the pipeline engineering team knows the exact locations and quantities). The electrical engineering team is responsible for designing the main and branch lines of the static grounding network as well as compiling the related materials (the pipeline engineering team should provide the electrical engineering team with information regarding the layout of equipment and pipeline grounding plates). If it is necessary to install grounding elements in reinforced concrete, the electrical engineering team should inform the civil engineering team of the requirements for embedding such grounding elements. During construction, the equipment and pipeline installation teams will be responsible for installing the static grounding plates on equipment and pipelines, while the electrical construction team will handle the installation of the main and branch lines of the static grounding network. These suggestions are provided for discussion.
This is generally carried out by instrumentation or electrical systems; the electrical department is responsible for the design and provision of materials, while the engineering department handles the actual implementation.
Static grounding includes the static grounding of equipment, the static grounding of structures, and the static grounding of pipelines. I think there are no issues with the static grounding of equipment and structures, as it is relatively easy to implement during construction. However, due to the large number of pipelines, the static grounding of pipelines is more complicated to carry out. During the design phase, there are pipeline and electrical specialists, and during construction, the construction team also includes specialists in pipelines and electricity. In the past, it was the piping department that handled the installation drawings (standard diagrams) and materials related to static grounding. On-site, it was found that the construction team did not have a good understanding of static grounding and often failed to refer to the standard diagrams, as a result of which static grounding was not carried out. Later, it was decided to assign this task to the electrical department, but that approach also proved ineffective; static grounding requires a connection plate to be welded onto the process pipes, and the electrical department is unaware of the material properties of these pipes, nor do they possess the necessary welding skills. In the end, static grounding was indeed carried out, but it did not meet the requirements (in some cases, if the piping department and the electrical department are separate units, the piping department does not allow the electrical department to weld connection plates onto the pipes). Finally, after several meetings and discussions among the company’s electrical, civil engineering, and piping installation teams, our current approach is to establish a boundary at the two connection plates. The side connected to the pipes is designed by the piping team and installed by the piping installation team, while the other side is designed by the electrical team and installed by that same team. Additionally, the standard installation diagrams for the static grounding of pipes are provided to both teams. During construction, let the two specialties remind each other.
1. The pipelines for static grounding are determined by the process and safety teams based on the characteristics of the objects. 2. The design and materials are to be handled by the electrical engineering department. 3. The construction is carried out by the electrical engineering team. 4. Acceptance is carried out by the process supervisor and the safety supervisor.