Looking at using benzene as a solvent up to 300F. It appears carbon steel has less than 2 mpy under 100F (storage) and 316SS up to 150F at higher concentrations. However, benzene will vary in our seperation column (0-100%) and I have found Alloy 20 to be acceptable to 212F in several...
It is my experience to remove free iron from the surface, only passivation is required. It is not as deep of oxidizing process as pickling.
I've performed a light nitric acid wash (passivation) before in place on a vessel because of what we thought was contaiminated free iron on the inside...
My experience as I tour mills and fabrication shops is after hot working SS components (plate or dished heads), its black and you have to shot blast it remove the scale. It is then a little dull so the Mill will pickled it with a farily strong acid to restore its Cr oxide (protective layer)...
ASME B31.1, Appendix ??? shows the benefit of cutting the end of a pipe to change the force vector and reduce bending moments on the boiler nozzle. I notice a bending moment symbol on your sketch, so I put 2 and 2 together...
What is your input on why the pipe is beveled at 45-degrees?? Is...
Ah... Sounds like you had a job in the south.
Back to my first question, are you suggesting the 45 degree cut is to split the PSV discharge force into two smaller vectors?
Gator... don't see any previous threads from you but from your sketch, I believe you're supporting the idea that an angle cut changes the forces and moments on the PSV nozzle???
You wouldn't be a UF Gator would you???
Good dialog... For those who use API 520, you will notice there's a straight cut on the discharge pipe diagram. As a member of API 520, I have been asked to come up with either scientific or experimental evidence for why we should change this diagram. I have solicited the assistance of some...
Thank you Nozzle Twister for your reference to B31.1.
Looking around, some cars have tail pipes beveled and some don't. That would support your statement that there's no increase/decrease in capacity. Beveled underneather supports your noise theory and re-directing flow (i.e. down).
I don't...
Does anybody have a scientific reference (or test data) to why the end of an open pipe is often cut at a 45 degree angle. My recollection is a straight cut could build up harmomics (standing waves) and reduce capacity. If you notice, organ pipes, and many automobile exhaust pipes are cut at an...
Does anybody have a scientific reference (or test data) to why end of an open pipe is cut at a 45 degree angle. My recollection is a straight cut could build up harmomics (standing waves) and reduce capacity. If you notice, organ pipes, and many automobile exhaust pipes are cut at an angle...
Cubic expansion coef. can be calcualted by taking the difference in speciic volume at two different temperatures divided by the average specific volume, divided by the temperature spreade.
Beta = ((n2-n1)/navg)/(1/t2-1/t1)
where n (nu) equals specific volume or 1/density
Type in Assessing...
I believe it also states 18 psf on vertical cylindrical surfaces, corrected for wind (V/120)^2.
It also says 30 psf for horizontal projected areas of conical or doubly curved surfaces.
Not being a structual engineer, does that mean you use 18 psf for overturning moment (vertical projection)...
A saw a study from Huricane Andrew that reported a tank's domed roof failed at the top seam because of uplift and actually prevented the shell/bottom seam from failing. The weight of the tank's contents kept the tank from blowing over per se.
When did the wind tunnel study of dome roofs occur...
Isn't the uplift force due to the aerodynamic shape of the roof. Wind blowing across a foil will cause lift. A dome roof has a higher uplift coefficient than a cone roof. I have a graph that shows the uplift coeff is 3x on a dome roof than on a cone roof.
