I calculated K to be 1.8 and Kl/r = 180. I've been asked to re-evaluate the tension on the cross bracing for the entire stair load on the one brace, not just the uniform load at each platform. Since the columns are already installed I will apply the 5% of load on the bracing. And it looks like...
Thank you all. I think the sway is in the columns. The stairs are 45 feet high. headers and stringers should be providing the transverse bracing. Stringers and headers analyzed for 100 lb/ft load and 1/4" deflection. Columns are tube so I constant. The sway I'm trying to reduce is probably local...
Yes same here, platforms and treads are grating not concrete filled pans. So you are saying you braced the stringers not the columns. What about bracing the headers to the stringers at the platform sections? I figured by x-bracing the columns and designing the bracing in tension, I would reduce...
Stringers analyzed for 100lb/sq ft, deflection L/360 or 1/4 inch. KL/r is 1.8 columns sized @ 5x5x5/16. Owner wants free standing stairs, they are connected to a top floor though. Appears stairs only swap translationally in the plane of the headers not the stringers. Headers are C8s. Bracing...
I have a few free standing stairs and platforms that seem to be swaying a little too much for the people using them. These stairs and platforms have been analyzed for loads specified in ASCE-7 and deflections limited to 1/4 inch. I recommended and designed cross bracing to limit the sway. I...
I did explain that I was looking for plots for the combustion of those compounds. Plots of concentration verses time, oxygen percent, temperature. These plots are determined using the Arrenhius Rates. Since you were way off base with your first reply I felt compelled to elaborate.
Thanks for...
Thanks for the reply. I don't think you answered the question. We know the flow rate, composition, and all the other stoichiometric details that you presented.
Question again:
What are the Arrenhius Rates for the combustion of these constituents? From this we can construct destruction...
Where can I find plots for the combustion of compounds such as dimethyl disulfide, methly mercaptan, dimethyl sulfide, hydrogen sulfide vs. percent oxygen and temperature. I am trying to determine HAP remove efficiency in flue gases using the excess oxygen and the temperature of the flue gas.
What are the specific characteristics of the wastewater?
Be careful what you use to neutralize. Remember heat of mixing. Avoid strong acids; consider weak acids.
We generate 5,000 gallon batches of spent caustic scrubber from stack emission control. The routine is to ship off site by tanker truck for treatment. We are looking into alernatives. We use to treat on site when we had a pretreatment plant, which we demolished.
My first step is if I can apply...
Hilti has a program you can download from their website to select bolts based on configuration of the bearing plate, concrete specs, and loads. But you input the concrete thickness and the program will tell you which bolts pass and which fail. Programs work for US and International.
You had an explosion and a fire because of these chemicals?
Generally explosive materials create a blast or a projectile. They include explosive and detonating devices.
It appears you have flammable liquids. I don't see how they can be explosive, by shipping definition, especially at ambient...
phoward answered the question. There are 6 divisions of Class 1 explosives. If you read them, it does not appear that this particle product, understand it's called Polish Wax,is an explosive. You didn't answer my question as to why are you shipping it.
Get the MSDS that should tell you. If you don't have it contact the manufacturer.
I don't see how it is explosive. But with 70 percent xylene it could be flammable. A Class 3 flammable liquid has a flash point less than 60.5 degrees C. A Class 3 combustible liquid has a flash point between 60.5...
These compounds can be easily scrubbed with water. You need to get the disposal cost for the water though. Unfortunately you are most likely generating a hazardous waste. Are you a generator now? That is do you have an EPA ID number as a large quantity generator. I apologize are you in the USA...
I'm a little confused. But that has been happening a lot lately.
OK
1. you currently have a holding tank
2. if pH is within acceptable range, it automatically discharges
3. so if you have a spill you don't want it discharged purely based on pH, you need further analysis
Correct?
4. so you...
My first question is how did you get away with discharging cooling water to a wastewater treatment plant? So now you are going to reduce your flow but increase the concentration of pollutants. Is pH adjustment your only treatment. Adding a holding tank is only practical with batch or...
I think it is very viable. Each waste generated can be evaluated through a hazardous waste determination program.
In the USA we follow USEPA regulations 40 CFR 260, 261, 262.
Program can be question and answer steps following the subparts of the regulations. I would add an extra step to...
This is obviously a political issue. I don't know the environmental laws in India, and I don't think directing you to the United States EPA will help. You need to become familiar with the environmental laws of India. Hire an environmental lawyer. The organizations you seek are environmental and...
If you can show that the flushed demin water is at surface water standards you should be able to inject it, that is discharge to groundwater. How much water? What state are you in? What is the groundwater classification in your area? You need to find a general permit to do this. It's you only...
