Are there many designs in the site that are required by regulations but are actually unnecessary?
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I wonder what are some common designs that are required by standards but are often missing in practice? I’ll start. If there are shut-off valves on both the supply and return pipes for the cooling water, then a safety valve should be installed before the shut-off valve on the return pipe; I notice that safety valves are not present in many drawings. Steam pressure relief valves and control valves should be equipped with steam traps, but these are not shown on many drawings. Steam traps should not have bypasses, but in reality, many designs do include them.
All of the above is true.
Hey, can’t you give a few examples of situations where things differ between the on-site conditions and the design specifications?
I didn’t finish the previous sentence; I originally wanted to go back and edit it. Regarding the standards for the aspects you mentioned, there are actually more than one set of standards. For example, the piping for the heat exchanger’s circulating water is also covered in more than one standard; however, I haven’t seen any regulations regarding the installation of safety valves at the outlet ； I have indeed seen statements suggesting that cross-wires should not be used with strainers, but the specifications also outline how secondary wires should be installed, and many diagrams show them being used along with strainers.
It can only be said that many designs do not follow the standards; designing in accordance with the standards is the right approach, as it will at least prevent major mistakes
Many standards are simply not properly written, and many of them have not been updated for years, falling far behind actual practical experience
Are you trying to undermine the experts who are responsible for formulating the standards? :Lol, for those elements you mentioned, it’s better to follow the standards. Since they don’t relate to safety, they are often forgotten by designers and not included in the design, but actually, it’s more reasonable to adhere to the standards in such cases
Sometimes, accidents don’t necessarily occur even if such design measures aren’t taken. Many safety-related designs take into account potential future scenarios; they might not be needed for several years, but their presence still serves as a safeguard for safety. Designs should be created in accordance with relevant standards. For example, if the valve on the return pipe of the heat exchanger is accidentally closed, the heat will continue to build up, leading to overpressure and a risk of pipe rupture. It’s possible that the valve will never be accidentally closed in this way, and in that case the safety valve will never activate
We manufacture safety valves, and we also produce rupture discs for high-pressure applications. It’s necessary.
I also often add bypasses next to the steam trap. It is mainly intended for use in flushing pipes before driving. Normally, the bypass is turned off!
One should learn *HAZOP analysis first, and then take a look at the relevant standards.