Purified water is never distributed through stainless steel partly since concern of contamination, as @chipbuster said.
You will really only need metal if extreme pressure or temperature is required. Certainly, glasswares are relatively stable across variety of pH and very difficult to be oxidized or reduced. Ions get picked up, when water flows through. You can see through, glasswares are cheap. Transparent. Overtime on metal surface will build up a layer that has all kind of compounds in them. The reason glasswares are commonly used in the lab have little to do with pure water. Basically, the most major reason would’ve been that glass is better in all respect. Many pollutants in the air, metal reacts not only with oxygen.
That’s a fact, it’s also unwise to use glassware to distribute ultrapure water you will get ion contaminations from glass as well. Generally speaking pure water is less corrosive than water with impurities, water at very high temperatures and pressures is corrosive. Some power plants use purified water in their cooling systems for this reason. Now regarding the aforementioned fact… Purified water are actually almost always stored in plastic containers and distributed through plastic tubes.
Ultrapure water eats nearly everything, including Pyrex, I’d say in case we define corrosivity as impurification of the water.
Original post if full of falsehoods, as stated by others. There are also falsehoods in the replies. Plumbing is usually polyvinylidene fluoride, polyperfluoroalkoxy, ethylene chlorotrifluoroethylene.
UPW isn’t caustic. We actually wrote a paper on this topic as researchers were always complaining that their water was acidic. For instance, conversely, in it’s purest form it being that acidic when exposed to atmosphere since it readily absorbs CO2, that converts to carbonic acid. Proper pH measurement can only be done inline or with proper buffers. UPW will corrode iron, brass, poor quality steel. Furthermore, by default, UPW can only have a pH of 7. It wouldn’t corrode stainless steel as long as the welds are proper, even so hard to make SS conducive to corrosion by UPW. Example, resistivity meters that we use are made of SS.
UPW won’t corrode Pyrex as stated above.
Exotic plastics don’t need to be used, similar to PFA, PVDF, Halar, and similar The possible exception is in a fab of a semiconductor plant. Distilled water is even made in glass stills for laboratory use. Power plants don’t use UPW as long as tap water is more corrosive. It won’t corrode it. We use polypropylene, PEX, and even PVC. Impurities from the water will leave residue on the evaporators in the cooling towers and render them useless. While having said this, it will leach some silica and boron, they actually should use special glass. Notice, since residuals will form on the turbine blades and throw them off balance and destroy them, all steam powered plants use UPW. LCMS grade water sitting in the lab for years. Put a brass or iron bolt in distilled water and see what happens compared to tap water. One can’t compare the corrosiveness of tap water and UPW. UPW can be corrosive to other metals since it forms carbonic acid when exposed to air. HPLC and LCMS grade water is placed in glass containers, right after all.
By definition, ultrapure water is defined as ~170 18Meg ohm or type I water. In theory, So in case you throw your TV into a tub full of UPW it won’t short out. Meaning does not contain dissolved ions to conduct electricity. DO NOT DRINK UPW, it will corrode metal fillings, leach calcium from your bones, eat the enamel in your teeth, even can cause your cells to explode. It is not good for you to drink as it has no minerals, even when distilled water isn’t considered UPW. That is interesting right, am I correct? Before you can do to much damage you likely will feel sick to the stomach. Tastes insipid. Generally, the irony is that the purer the water is the worst So it’s for you to drink. While on the subject, in our industry we call it ype II. Is considered as ASTM Type IV. It’s a well though, you can denature UPW by mixing it with Tang, powdered drink mix, tea, coffee, and suchlike It will make very strong tea and coffee. Since it contains no ions to conduct electricity, if swimming in a lake of UPW and lightening hits the water you won’t be electrocuted. The theoretical limit for UPW is ~1826 ‘Megohm’.
UPW is among the strongest solvents known to mankind.
It just means it’s always making an attempt to reach equilibrium by leaching out ions, VOC’s and CO2. UPW is the strongest solvents known to mankind. That doesn’t mean it will eat through everything. It just means it’s always doing best in order to reach equilibrium by leaching out ions, VOC’s and CO2. However, that doesn’t mean it will eat through everything.