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Hi, I am wondering if EN 10204 2.1, 2.2 and 3.1 cover tractability. for example, if we have a diaphragm and we wanted to one day trace it as there was a quality issue, could these certificates allow us to know exactly where it came from and what manufacturing batch? Also, is USP class VI the...

I have purchased an expensive piece of equipment from Europe but there seems to be multiple standards used for the different connections. Is DIN2635 PN40 identical to EN1092-1/11 B1 PN40? I had a look at two spec sheets and the sizes look the same What is EN1092? Is that just and update on...

Hi, We have a large steam condenser that is running poorly! The problem: 1) the condenser steam inletcontrol valve goes to 100% 2) the condenser fills with water 3) the outgoing water line that is being heated drops in temperature (because the condenser is full of water) 4) When I open the...

Hi, We seem to be using a lot more sizing agent to achieve target cobb than normal. Can't figure out why. If anyone else has experienced high size usage (we use ASA) then let me know what you did to bring it back down to target. Kind regards

hmmm I could get the lab guys to run an inorganics test on both samples to get full specs on ions. Would then know total composition and resulting reactions!

Thanks guys, you can consider this problem as solved now (I played around in the lab for a while and got a decent result). Still a bit vague about the theory behind it but all good. Not sure if there is a button to press on this page to say that I have been helped and I do not require further...

I realise something stupid. I could just go and take a sample of both streams, mix them in the lab and measure the resulting pH. This being said, understanding the theory is still important. 25462, I don't think you can use your method because you didn't take into account H+ and OH- reacting...

Hi, I haven't done chemistry in a long time so this is probably quite basic but I just want to check my working for a pH problem: There are two streams that enter a mixing tank. Stream 1 flows at 92 m3/d and has a pH of 11. Stream 2 flows at 105.6 m3/d and has a pH of 2.45. I need to know what...

Hi, On our site we have an existing mixing tank. At the moment, the impeller is too aggressive and breaks downn the suspended solids into a size that is too fine for downstream processing. The mechanism for reduction is most affected by macromixing (overal mixing in the tank and not shear...

How can I use the NTU method if I don't know the heat transfer area?

Thanks! Makes sense. Let me confirm: 1) 1/U = 1/h1 + 1/h2 + R 2) If stream 1 flow rate changes, then only h1 will change which directly related to velocity change of fluid and remaining values used to describe h1 remain constant (d, Cp, j, etc). Hence, U = f(velocity) 3) Get HEX temperautres...

Thanks for getting back to me. I guess my real question is, if all stream flow rates and temperatures are known, but ALL details of the HEX are not (tube count, heat transfer area etc), then single stream entering has its temperature and flow varied, is it possible to calculate the new output...

Hi, I've been asked to examine the theoretical output conditions of an existing HEX if the cold side input flow and temperature were to change. I've simply used a temperuate gun on the HEX while it's been running to get the stream temperatures. The flows are recorded by flow meters. It only...