Flange bolt issue
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For the pipe flange bolts used with acids, alkalis, and hydrogen peroxide, it seems that double-headed studs or fully threaded bolts are better options. But what’s the problem with using hex head bolts? I checked the relevant specifications: hex head bolts are suitable for applications where the pressure is less than or equal to PN16, for non-toxic, non-flammable media, and in situations where there is no intense cycling of fluids. The pressure I work with isn’t high; so is it okay to use hex head bolts in this case?
What’s your pressure level for operation? Is what you call a hex head actually a single-ended bolt?
The pressure is less than 1 kg; since it is a metering pump, the height difference after the pump is around 5 m, and the length of the pipeline is approximately 25 m, so the operating pressure is not high
Sure, that’s possible; add shock absorbers and flat shims on both sides. But I really have never seen a flange bolt with a single external hex head
The range of toxic and flammable media is not defined in the flange standards; I believe it is appropriate to determine it in accordance with TSG D0001-2009 \"Regulations on Safety Inspection of Pressure Piping – Industrial Piping\"
If your project is in Dongying City, you’ll probably need to be careful. ;P
That won’t work, right? Hex head bolts are generally used in situations where there is no toxicity, no flammability, and low pressure, such as in circulating water systems. Acids, bases, and hydrogen peroxide are all highly corrosive substances; to prevent leaks, it’s better to use double-headed studs
Well, normally one should choose studs, but considering the scope of application for hex heads, I don’t see any problem with them: they are non-toxic, non-flammable, and not subject to severe cyclic loading