Every time pipes are installed on-site, there’s always a shortage of materials, and after adding more, there’s still a shortage； Or issues such as improper size control
Thread Content
Every time our company carries out on-site installation of projects, there are always problems with the piping materials. For example, it seems that there aren’t enough pipes; 3 deliveries are made, but after installation many more pipes are left over； 2. When installing pipes, inaccuracies in dimensions often occur, and the distances between the pipe fittings are not sufficient ； 3. Sometimes problems are discovered halfway through pipe installation, and the installation has to be redone if it is incorrect. (To clarify, our company is not an engineering firm; we are a supporting services company that develops subsystems, as well as wastewater treatment equipment and chemical dosing systems.) ； Since there are no specialized pipeline engineers, we, as process engineers, prepare the plans or create 3D drawings. When we arrive at the site, we basically follow those 3D drawings or process flow diagrams, or the on-site installation staff carry out the installation; in some projects, there are also axonometric drawings prepared by design institutes that specify the dimensions. I’m not sure if this phenomenon occurs only in our company. I have been working at my current company since graduating, handling process planning and drawing tasks; I don’t go to the site very often. I’m quite confused by this situation, so I hope those with more experience can share their insights. Thank you!
1. It seemed there wasn’t enough piping material; 3 deliveries were made, but after installation many more pieces were left over； Whose feeling? Many? Is this an estimation error, or is there a problem with material control? 2. When installing pipes, inaccuracies in dimensions often occur, and the distances between the pipe fittings are not sufficient ； Is there no space to install the fittings? In other words, when two 90-degree elbows are joined together, the distance between them is only equivalent to the distance of one and a half elbows? 3. Sometimes problems are discovered halfway through pipe installation, and the installation has to be redone if it is incorrect. What kind of problem was found? Was it a wrong connection? Did you encounter structures, equipment, or civil works? Overall, it seems that no actual on-site measurements were carried out, the design drawings lack sufficient detail, and they are either too idealistic or too casual.
There is a significant difference between design and actual construction; designing requires considerable expertise, and if one does not understand the actual process of construction, such problems are likely to arise
This situation happens often, and it can’t be said to be normal or not.
For pipes that meet national standards, they are stored in multiple locations; the main focus is on managing inventory levels properly
That’s because the preliminary drawings weren’t prepared properly, and the piping work wasn’t done correctly
This post was last edited by od110 on 2017-4-21 22:01. Basic steps for pipeline installation work: 1. Obtain the single-line diagram and start analyzing it. Determine the prefabricated opening and the on-site opening. Leave a 50mm margin at the on-site opening. 2. Start prefabricating the pipes. 3. Transport them to the site for installation. 4. Adjust the on-site opening left there according to the actual length on site, and then weld it. Completed
This post was last edited by od110 on 2017-4-21 at 22:04. Logically, with 3D drawings or ISO drawings available, the accuracy in material estimation and design errors should be very high. However, there are always some errors on site; it’s normal for the difference in each direction to be between 100 and 300 MM. It also has to do with the installation method and the order in which the pipe sections are installed. When I did the installation for the first time, I knew nothing about it; there was a section of pipe that connected the pump to the bottom of the tank on the other side of the device. The installation order was incorrect, but the difference was only 800 mm... For a project involving tens of thousands of meters of pipes, the actual length turned out to be pretty much consistent with what was specified in the drawings. But according to the poster’s description, it seems like there’s a significant error. . . . There’s a problem with the design, right? .
For those where certainty isn’t available, adjustment sections can be added; many of our chemical plants do this
First of all, thank you. It seems that our company isn’t standardized enough; as you said, if the preliminary work isn’t done properly, it becomes difficult to do things well later on
Thank you; I’ll bring up your suggestion. Who knows, it might be used next time