The price issue of flanges
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As the title suggests, it’s a plate-type face weld flange with the same nominal diameter, but different pressure ratings – for example, one is PN10 and the other is PN16. Is there a significant difference in price between the two? If it’s not very large, a flange with a higher pressure rating can be chosen.
The unit price of flanges in the lower weight classes is generally higher, while those in the higher weight classes are cheaper, as the amount of material left over during forging is fixed. Overall, however, the flanges in the lower weight classes are still cheaper; they have a smaller outer diameter and thinner thickness. The case you mentioned is an exception – the flanges under these two pressures differ little, so their prices are similar.
Oh, the person upstairs answered in great detail; they said the price difference shouldn’t be significant
When selecting flanges, it’s not the case that the higher the pressure rating, the better to choose a flange with a higher rating. For example, for PN10 and PN16 valves, the difference in specifications is minimal; however, during installation this isn’t possible – a valve with PN10 rating requires a flange with a PN10 rating as well, and a PN16 flange cannot be used with it.
The unit price of flanges in the lower weight classes is generally higher, while those in the higher weight classes are cheaper, as the amount of material left over during forging is fixed. Overall, however, the flanges in the lower weight classes are still cheaper; they have a smaller outer diameter and thinner walls. The case you mentioned is an exception – the flanges under these two pressures differ little, so their prices are similar
May I ask, are you a manufacturer of flanges or do you do something else?
It depends on the specific specifications and standards. For example, for those conforming to HG20593-97 with a diameter of DN150 or less, the pressure ratings of 10 and 16 are the same (including the DN150 size). However, for sizes larger than DN150, the pressure rating of 16 is much more expensive than that of 10; the greater the size, the larger the difference. The pressure rating of HG5010-58 at 16 is more expensive than that of HG20593-97 at 16, but the pressure rating at 10 is cheaper. So you should take a look at the specific details. The price of flanges depends mainly on their outer diameter and thickness. I am a flange manufacturer; feel free to contact me at 13634255059 or via QQ: 247427810
For the chemical industry, HG/T20592 is generally the standard used; the standard you mentioned is rarely applied.
The price of flanges mainly depends on their outer diameter and thickness; can it be understood that the more material used in a flange, the higher its price? In other words, with the same material, the heavier it is, the more expensive it is? Seek an answer
It probably depends on the diameter; if it’s a small diameter, there shouldn’t be much difference between 10PN and 16PN!
In general, it means that such products are abundant in the market, the requirements for them aren’t high, and their specifications aren’t too extreme; since many people produce them, it’s easy to manufacture them, so there’s no difference in prices. In my opinion, everyone should avoid criticizing others