Temperature is 20°C. I have some information:
- Sulfate concentration: 5.000 mg/l
- Sodium concentration: 18.000 mg/l
- Chlorure concentration: 18.000 mg/l
- Disolved solids: 65.000 mg/l
- PH: 6,0
Hope it works.
Felipe
Hello,
I have 2 interesting questios, I believe, regarding polymer properties. I am designing a ball (pretty much like a basketball in size and appearance) to be used inside pressure vessels for certain corrosive fluids. The ball is inflated with air to a certain pressure in order to cushion...
Hello,
I have 2 interesting questios, I believe, regarding polymer properties. I am designing a ball (pretty much like a basketball in size and appearance) to be used inside pressure vessels for certain corrosive fluids. The ball is inflated with air to a certain pressure in order to cushion...
Thank you for your answers. As I can see from them, not all the PUs are certifies for working with drinking water (my application is in pump systems).
I have my production in China so I asked some people there to find out if their chinese suppliers of PU have certification, but maybe I should...
I would like to know if any Thermoplastic polyurethane (TPU) is suitable for drinking water. I believe there should be many kinds of TPU, in which case it would be interesting to know if all of them don´t have problems if in contact with potable water.
Another thing would like to know if there...
Thank you patprimmer, from what place the standard is, its not so relevant to me. BS 6920 seems to work just fine.
Pud, your list has helped me a lot! That way I can directly ask any providers for all those polymer options.
Thanks anyway tom1953!
Thank you all for your replies. Tom1953, its been very helpful yur info. I see that NSF 61 section 6 might be what I am looking for:
Section 6= Specific requirements for Joining and Sealing Materials/products such as o-rings, gaskets, lubricants, adhesives, elastomer materials, etc.
The thing...
I use an application in which balls made of polybutadiene are in contact with drinking water. I need to certify that the contact of the polybutadiene with the water does not affect the flavour and does not leave toxic components in it.
So, first of all I need to identify what are the elements...
rb1957, if the balls work and I manage to prevent the air leaking in a good deal, there won´t be need for bladders anymore (too risky if they blow up). This is aimed at getting rid of them. So it is critical to avoid these leaking as much as possible.
IRStuff, sorry, "better" is very abstract. What I meant with "better" is a valve that makes it more difficult for the air to escape. I ll check on inner tubes, thanks!
Unclesyd, the thanks for the sggestion but I would answer with the same previous message to "byrdj"
byrdj good suggestion but the fact that I introduce the balls is to exactly be the competition of the bladders. Yes, you can recallibrate the air withouth opening the tank (as long as by pressing the valve, water doesn´t come out) but if the bladder blows up you have no protection. The balls...
Yes, no problem with protuding valves as long as they are better than the usual ones, because at least in the usual ones the protusion can bu cut and a tire patch can be glued above it.
rb1957, because they are just ball manufacturers. We ask them for a special ball but they have no idea about water-hammer and don´t have the equipment to test them. As long as we can test them and then tell the fabric to innovate according to our results, that works.
IRstuff, I see your point...
IRStuff: like a bicycle valve you mean? So, your opinion is that those valves are better for isolating the air? Any idea why?
Ron: I saw the page but couldn´t figure out exactly how it works. Cold you give me an idea?
rb1957 and TheTick: the balls are specially made for our application, they are not the basketball you buy on a store, which don´t withstand too much inflating pressure. These balls resist more than 100 psi of inflating pressure. As good as they might be, still there is a 5-15% air pressure loss...
EngineerTex, so far haven´t thought about changing the gas, but will check upon it. Your procedure with rubber cment sounds original. The rubber cement is a good isolating material then, right? Don´t know if I can push the valve, probably could damage ut, bit could put a bit on it. I am testing...
Ron and Cloa: the balls will be put inside a pressure vessel aonnected to a pump system and then the water inside (surrounding thee balls) will of course get the pump pressure. When an event called water-hammer occurs the pressure wil go down violently and then go up after some seconds, and so...
The basketballs are not for playing but for engineering purposes and they need to lose as little air as possible. My concern is that the usual valves used in these balls are not that good in preventing the air leaking. Can another valve, like tire valves, be installed in a ball when it is...
