A few minor issues with the nozzle orientation diagram
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Recently, while reviewing the orientation diagram of a project, I found that elements such as nameplates, foundation bolts (holes), and static grounding plates were missing. I asked them to add these in accordance with the depth requirements specified in standards such as HG/T 20519-2009. They don’t understand and ask me what the harm is if I don’t do it. Please discuss how to respond. I also have a few cases on hand that I’ll share with you gradually.
It seems that the biggest issue lies in the anchor bolt holes. If the structural details are not checked based on the manufacturer’s specifications and there is a lack of communication, it’s possible that the equipment won’t be able to be installed, or the orientation of the pipe openings after installation could be incorrect, which is quite troublesome. There should be no major problems with the branding and grounding aspects; still, it’s advisable to address those points carefully
Let’s talk about the anchor bolt holes first. There was once a project in which, on the drawings related to processes, equipment, and civil works, several pieces of equipment were shown either positioned at the midpoint or in the middle of the structure. After the equipment was installed on site, errors were discovered during pipeline installation. The equipment is high-voltage, and the pipes are prefabricated; only the equipment can be reinstalled. But it’s in a remote area, and the large crane has already been taken elsewhere; there’s nothing but to wait. The owner finally said through gritted teeth that just this one item caused a loss of around 100,000 yuan.
There are standard requirements for the standardization of design drawings
There is another minor issue: the location of the nameplate is not indicated on the diagram, and the equipment manufacturer shipped the units without attaching any nameplates. There are two tanks, AB, with identical identifiers; during installation at the site, their positions were reversed, and it was discovered that they were installed in the wrong place once the piping was connected.
The orientation issue of the ground plane is rather complex. It involves three specialties: electrical, piping, and equipment. First is the question of whether to connect it to the grounding grid throughout the facility; this cannot be decided by the piping department and must be decided by the electrical department. As a piping professional, the SH 3097—2000 \"Code for Design of Static Grounding in Petrochemical Industries\" that we are familiar with does not specify this clearly, making it impossible to determine. The documents HG/T 20675-1990 \"Code for Design of Static Grounding in Chemical Enterprises\" and CD90B4-88 \"General Diagrams for the Installation of Static Grounding in Chemical Enterprises\" specify that it is necessary to connect to the overall grounding network of the facility; these documents are somewhat outdated, and many people are not familiar with them. Since it needs to be connected to the grounding grid throughout the site, if this is not indicated on the layout diagram, there will be problems on site. Either make changes, or dig trenches again.