Tmoose,
Yes, there are fluids flowing thru the holes quickly.
But the holes are suposed to be well rounded. Thus, the thickness of the plate will be reduced from 3 mm (PTFE plate) to 1,5-2 mm (SS316 plate), wich helps reduce the head loss through the orifice (i'm not taking this "bonus"...
MikeHalloran
You are right. Talked with maintenance team. It would be very hard to drill with less than 3 mm spacing without bending the plate, so it will be laser cutted.
2 mm spacing x 2 mm thickness was advised based on experience to be very safe values, and it's good enough for my intended...
I'm changing a PTFE support plate in a packed distillation column for a SS316 plate.
This plate must have the maximum possible open area to minimize capacity limitations before flooding in the column, so i must drill the maximum possible number of holes (I know that there are special designed...
Yes, the inert % of the stream is air.
The State laws limit the total mass of polutants that can be emitted. I can't just change flow rates or discharge those gases higher (just curious: these kind of allowance still exists in developed countries?)
Cars use small catalyst vessels for CO...
OBS.: 1.000 Nm³/h = 1000 Nm³/h
Sorry for the confusion. In my country we use commas for decimals and dots between thousands.
In God we trust. All the others must bring data.
sshep,
You're correct.The beams were originally designed to support 1 1/2" packing directly over then, without support plate. The packing was changed to reach better separation, probably without taking these internal details in consideration.
Currently, my major problem is due to poor liquid...
I will open a small distillation column (3.000 x 300 mm) for maintenance in a few days. This column is packed with 1" Intalox Saddles (void fraction: 77%) and have a PTFE support plate with 15mm holes spaced by 4mm (free area: 41%) (there are the support beams right bellow, that block about 50%...
Thanks for the answers, this already gave me some usefull insights, especially about the TOs.
Still have some questions:
1)What would cause the catalyst poisoning in this stream?
2 Typically, what are the concentrations and flows handled by catalytic oxidizers?
3)There is not such a thing like...
I have a gas stream ranging from 10 to 40 ppm of Carbon Monoxide that must be reduced to 0,08 ppm for emission (flow rates: 1.000 Nm²/h). This stream also have 10 to 40 ppm of dimethyl ether, toluene and dimethylamine.
Most of the processes for CO elimination that I checked involves...
georgeverghese,
First, thanks for the tips.
"jacketed gear pump" was a poor translation (i'm Brazilian). I meant exactly this kind of pump (we already have one handling a very high viscosity fluid; many times more expensive than the standard cast iron external gear pump, but worth every...
I'm designing a new pumping system for a relatively high melting point (72°C) and viscosity (6.600 cP) through a 90m, 2 in SS316L line, with ambient temperatures that can get to -5° on some nights in the winter.
The fluid can be heated up to 100°C without any degradation. I intend to heat the...
rahulsb,
Do you have good level control on the tank? Could you tell when a certain level was reached by the recorded historic of the levels?
If yes, you could open a dedicated entry just for the relief valve. If you size it accordingly and never let the liquid level reach it by proper level...
It's a multipurpose plant. Vacuum is used on some transfers with one product and distillations with the other, so the vacuum isnt intensively used. Also, the maximum vacuum barely reach 100 mbar, we're not talking about high vacuum. My main concern was about operational errors allowing the...
MJCronin,
Its not an opinion. Its a filtering criteria, based on financial restrictions. The C276 would take almost four times the available investment, with a payback >3 years (50% higher than the actual policy allows for minor process modifications).
I stated that i would run tests under...
MJCronin,
Sorry for the incomplete info. By the way, here goes another one missing in the original post: most lines needs to be heated up to 60°C (trace heating)to avoig product crystalization. PTFE lined pipes, for its lower thermal conductivity, tends to make the plugging problems more...
MJCronin
There are 6 reactors and vacuum is used for distillations in 4 of them. The process is not fully automated, so we have to assume that almost all the lines will operate under vacuum at some moment.
The operating temperature stays bellow 90°C in the main process. But in another process...
Someone has any experience with Ultra 654 SMO and Ultra 904L?
They're austenitic stainless steels with higher amounts of Cr, Ni, Mo and N (Ultra 654SMO).
Moltenmetal,
Never using lined pipes for vacuum aplications is a general rule of thumb so, indeed, it can be wrong in some situations.
Where this diameter value come from? I would like to read more about it.
Compositepro,
Indeep, equalizing the pressure would eliminate the collapse problem...
I have highly agressive streams that causes frequent pitting corrosion problems in the piping. I would like to change it in order to extend the lines lifespan, as well as improve the process safety and reliability.
The streams ranges from basic pH (12) to highly acidic (5% HCl). An aqueous...
