To the designers: Please don’t tease us workers like this (4)
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1. http://bbs.hg707.com/data/attachment/forum/201606/19/092620fkvsvxxqs87uwz2z.jpg There are clear specifications regarding the orientation of lift-type check valves; I wonder where the integrity of the guy from this design firm has gone? It is still on one of the feed pipelines of the device. Because of this oversight in the design, subsequent emergency plans were developed for this valve. We can only handle it after the work stops. . . . . . 2. http://bbs.hg707.com/data/attachment/forum/201606/19/092622zlf99m6vkj6pv5m6.jpg The disc pump and the valve assembly in front of the tank interfere with each other, making it difficult to operate the upper and lower storage tanks. 3, http://bbs.hg707.com/data/attachment/forum/201606/19/092623hf1hnhyy6qfoqheh.jpg The fact that there are significant differences in the dimensions of mass flow meters from different manufacturers was not taken into account; as a result, after the pipelines were installed, it became necessary to dig out space to accommodate those mass flow meters. 4. http://bbs.hg707.com/data/attachment/forum/201606/19/092625u8w4y8k8a98yybw9.jpg No space for core extraction and maintenance has been considered above the control valve. 5. http://bbs.hg707.com/data/attachment/forum/201606/19/092626h7enfk42nuqqfxqn.jpg The level gauges and pipeline drain valves are too low above the ground, causing liquid to spill everywhere during maintenance and draining. 6. http://bbs.hg707.com/data/attachment/forum/201606/19/092629dk63bhnnwreb5353.jpg Whether you can reach it or not, this valve is 2.5 meters tall; in any case, I can’t reach it. . . The reason is probably that there is no place on the platform to install the pipes. . . 7. I saw in the post calling for submissions for events a diagram showing a design where the shut-off valve and the check valve were installed in reverse order: http://bbs.hg707.com/data/attachment/forum/201606/19/092630e1zwxnjnkcujj12x.jpg. I remembered that I indeed observed many such instances on-site; see the images below: http://bbs.hg707.com/data/attachment/forum/201606/19/092637oy22zjquyx0y255y.jpg http://bbs.hg707.com/data/attachment/forum/201606/19/092641gj10nrqapmwn01v1.jpg. When installed in reverse order, the check valve ends up above the shut-off valve, which makes it difficult to drain the fluid from behind the pump. Normally, the check valve should be at the bottom and the shut-off valve at the top; a short section can be added in between for draining, or a drain port can be installed on the check valve. 8, http://bbs.hg707.com/data/attachment/forum/201606/19/092648exm6rrr11byk2xam.jpg Y-type filter for fire water supply in tank areas: “Can’t hold it in any longer – needs to be drained right away”! During disassembly and cleaning, it can only be removed along with the hose for cleaning (which of course is also inconvenient). Actually, it can be installed with the filter tilted at 45 or 30 degrees. Conclusion for today: Do your design, but don’t forget that design is meant to be operated by workers.
Design is a responsibility. However, it also depends on the understanding and judgment skills of the construction and post-construction renovation personnel; the addition of certain elements is due to the bureaucratic attitudes of some managers.
The main cause of most problems lies not with the design institute, but rather with the construction party and the owner themselves. The reasons are as follows: 1. First of all, the drawings need to be reviewed; whether there are actual errors in the drawings or not, why wasn’t the check valve installed in a horizontal position during construction? The construction party failed to raise this issue, and the owner should have noticed it in time as well. 2. Such problems occur easily, after all, there is no need for modeling to check for interference or anything similar. A way to solve this is, for example, to remove the railing on the left side and then add a small transitional platform between the two. 3. The straight pipe section before the flow meter is required to be 20D in length, and that after it to be 10D; it seems that the conditions in the photos do not meet these requirements. 4. The same as Category 1. 5. The same as Category 2. 6. If the valve can only be installed in this way, then an operation platform will have to be added. Furthermore, can people walk on such a simple two-layer steel platform? It seems to lack rigidity significantly; this wasn’t designed properly. It’s better not to use it until it’s reinforced – safety comes first. 7. Just correct the mistake. However, no support was seen for the outlet pipeline; the pump was mistaken for a support, so let’s correct that as well. 8. The installation location of this pipe support is definitely not related to the design (it’s impossible to show the support on the Y-type filter in the drawings); simply move the wrong support to an appropriate position. It seems there might be enough space, but if not, the only option will be to rotate the filter.
{:3_49:} I didn’t understand the first one. . .
It seems like there are many problems with the installation.....
Hey friend, you might not be able to use this in winter at the actual location. It’s not a problem in the south, but further to the northwest, after snowfall the exterior freezes up, and then your flow meter can no longer be used. This is a very serious issue.
It is recommended that the poster match each image with the corresponding design drawings before posting for discussion; without seeing the design drawings, it is impossible to accurately explain the issues based solely on on-site installation； Besides, you get what you pay for; many organizations, in an effort to save money, simply purchase a PID from a designer and then start construction right away.