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We have a recurring situation in our Selenium roaster, we feed SO2 to reduce selenium. The SO2 that we're using is a liquid cylinder SO2. We use a steam vaporizer to vaporize liquid SO2. Now the problem is that SO2 line always clogging. What could have cause this?

What will be the ideal vent of a nitric acid tank, the material of the tank is stainless steel and the nitric acid concentration is 70% by weight. Are flame arrestor applicable in this matter?

You need a thorough analysis of your TSS. When you determine what are those then maybe you can apply simple precipitation then followed by filtration of WW.

In choosing a pump, what will be the safety factor for the head and flowrate that will be multiplied to your theoretical head and flowrate so you can meet your demand and anticipate the decline of efficiency over time of the pump for at least 10 years? For our practice, an additional of 10% of...

What will be the ASTM equivalent of "IS 2062 E 250 BR (for plate)" in terms of chemical composition?

Thank you Pierreick, Okay thank you for the info georgeverghese, i will rephrase my question. If I have 3 control valves at 2 bars operating pressure, will be the pressure needed to open the three valves will result to 6 bars? Since we have issues in our plant that valves dont open as desired...

Are the pressure rating of control valves in a system additive? Like in a plant, I have 5 control valves at 2 bars minimum operating pressure, at most three valves will be working together. Is it safe to say that the minimum consumption of instrument air will be at 6 bars?

A main steam line is operating at most 7 bars, and one of the end user only uses 2 bars. From the main steam line of 200mm there is a pressure relief valve to make the steam pressure reduced to 2 bars before entering to a 100mm steam line. Now my question is that, will the mass and rating of...

The nitrogen is stored in a pressure vessel at 8 bars, and distributes nitrogen to end users at 7 bars max. There many end users and different pressure rating requirement, but mostly of the end users require at 4 bars for process and safety issues. There is a pressure regulator before each end...

An oxygen plant is supplying 1200 Nm3/h of nitrogen at 7 bars for miscellaneous gas as by-product. For the end users, they require nitrogen at 4 bars. Now the consumption of nitrogen is already at 1100 Nm3/h but at 4 bars. If I convert the end user consumption at 7 bars, I will get 733.33 Nm3/h...

How do you estimate specific heat of solution of a copper sulphate solution? The copper sulphate solution is compose of sulfuric acid, copper sulphate and water and other trace materials.

What kind of material is CrFC25 on JIS standard? In the detailed drawings of a nozzle sleeve it says that its material is CrFC25. The service fluid is for concentrated acid (sulfuric acid 93%-95% by wt.) What kind of material is CrFC25 or any equivalent material for nozzle sleeve.

Thank you all for your quick response. To have a constant volume of fluidizing unit to the hoppers, we planned to pre-mix the gases and discharge it at the same parameters as if it was a dry air. The set-up will be: There will be a gas receiver before the fluidization. In the gas receiver, we...

What will be the best material to be used in nozzles if our pump tank is made of carbon steel. Our service fluid is sulfuric acid. I'm worried about the galvanic corrosion that will happen if I will use dissimilar metals. Any thoughts of this, or any recommended material for the nozzles?

I have a dry air at 3040 Nm3/h 30 deg C and 5 bars (abs), now we want to make it to 97%N2 by adding dry nitrogen gas at the same gas parameters. We need to decrease the O2 level of the fluidizing unit in order to decrease the chance of copper concentrate sintering after drying it. Now, how much...

Thank you EdStainless It is a metallurgical acid plant. Is it okay to stick with the traditional material selection (carbon steel with fully acid bricks)? Our Drying Tower Pump Tank has served for almost 35 years and it shows many signs that it can reach 2022 for the predicted replacement...

Thank you EdStainless for a very informative response, My concern for now is not with tower, our tower is doing fine. Our pump tank is our concern because it almost reach its end life. Now, I need to evaluate the cost, sustainability, and maintainability of brick lined carbon steel, SX...

Good Day, We have a project to replace the Drying Pump Tank of our Sulfuric Acid Plant. The management wants us to have an option analysis on the materials that will be used. The Drying Tower Pump Tank will operate at -2 kPa at 80 deg C and the service fluid is at 95-97% H2SO4. The existing...

I would agree with quark if the action must be urgent. Mostly of the sealants can't withstand that kind of temperature.

I have a SUS 316L plate which is a tank cover. In the design the material of the braces is SUS 316L and the problem is that the only available is SUS 304. The tank is used as a leaching tanks. However the braces will not contact the liquid inside the tank. Is it okay to use 304 instead of 316L...