Thanks JL. There's an existing 4-20 XP transmitter and we are looking to loop it to a controller. I too expected that some 1/4 DIN units would be rated Div 2, just haven't been able to find one yet.
Hi folks, I haven't had any luck finding a free-standing PID tmperature controller (actuates a modulating cooling water flow valve) that can be located in a hazardous location. The operators will want to adjust the setpoint at will, and the non-XP control room is some distance away. Quite...
Looking for a lab-scale version of a high shear in-line disperser or mixer, flowrate less than 1 gpm. Most models are much bigger than this. Anyone have any suggestions? TIA
Have you checked out any of the books by Trevor Kletz ("What Went Wrong?", "Still Going Wrong", "Intrinsic Safety in Plant Design"). They are full of case histories over the last 20 years or so, not always fully documented, but the references may help.
It all sounds rather high tech to me...does this need to be an on-line measurement? If so density (the curves for glycol vs temperature are well known) via coriolis flowmeter, or refractive index should work well. Off-line, the same measurements can be made at insignificant cost.
Right, anhydrous HCl is not corrosive to stainless steel. It's water that makes it corrosive. Even superalloys like Monel (used for HCl pressure regulators) can be corroded if moisture is present.
For measurement in gas phase or in solution, there are a number of on-line analytical systems such as React-IR by Mettler-Toledo, or ATR-UV-Vis on-line spectroscopy etc. which can measure concetration of reactants, products, byproducts, etc continuously in real time. They use a diamond-tipped...
Yes I certainly would be curious to know if this is batch or continuous myself. Coming from the fine chemical arena, I automatically assumed he was talking about a batch reactor with a volume say, 50L, which is typical for a batch yield of 1 kg of a solid product such as a crystalline...
A few other manufacturers of oil circulating heaters (TCU's actually): HEAT, Inc., Budzar, Mokon. All reliable and helpful vendors. You might just have a conversation with a couple of them.
Again thanks for your input everyone. It seems I was somewhat ill-informed. Because of other salt complexes in this mixture, it actually contains less than 1% free ammonia in solution. And the history of pressure building up in storage totes was another miscommunication. There has never been a...
Wow! You folks are great. 0.08"H2O certainly is low. That's about as accurate a number as I need at this point. I thank you all. And thanks for the links and references.
Thanks for the references. Apparently, my pressure drop must be pretty small, since the Moody calculator says my friction factor is out of range.
Do you think the ASHRAE or SMACNA literature (where can I find it?) has a simple chart I can get a ballpark number from?
Anyone have a good source to estimate pressure drop of air (atmospheric pressure) flowing through pipes (3" to 6" diam). My flowrates are only about 10-15 SCFM. TIA
Thanks for those references.
Apparently this material simply off-gases and builds up head space pressure, which now I realize is unrelated to the vapor pressure numbers. We were hoping to use a poly tank, but that looks unlikely.
Thanks for your input, folks.
I should add that although the tank will be vented to the atmosphere, we need to keep the ammonia vapors contained as much as possible for odor control and to prevent the pH and chemical composition from changing.
