In the design of petrochemical pipelines, there are certain pipe diameters that are not commonly used and are not recommended for use. Why aren’t those pipes used frequently?
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DN100, 150, 200, 250, 300, 400, 500 are the commonly used pipe diameters. What is the reason why diameters like DN850 and 950 are not commonly used? Waiting online – anyone who has seen this, please give some advice!
The diameter of the pipes is determined based on the flow rate and the optimal flow velocity; for long-distance pipelines, pipes of around DN700 are used only when the annual flow volume is 16 million tons. Pipes of the type you mentioned are certainly used very rarely
The dimensions I mentioned above are just examples; 32, 65, 125 are not commonly used! Continue to seek the truth
Well, the link above makes it clear – the main issue is low production volume, which results in relatively high costs. As for the rest, no explanation is needed!
It must be a habit that has developed over time; nowadays it’s used less often, so manufacturers produce less of it. If one wants to purchase it now, it will have to be ordered separately, which makes the cost higher and makes procurement more difficult. That’s why people try to avoid using it as much as possible.
In my opinion, the main issue is that it hinders standardization, as piping work involves not only choosing pipes but also fittings, flanges, gaskets, and valves. Sometimes it’s easy to find pipes, but difficult to find the necessary fittings; therefore, it is not recommended for use