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Pressure vessels are a vast and diverse field spanning from tiddly-wink instrument air receivers to cryogenic propellant tanks and beyond. There is no one size fits all approach since technical requirements are vastly different for each application. Zeroth law, it must meet customer technical...

Many of the new stringshoe, independent cannabis growing "barns" directly inject CO2 to promote faster growing conditions, in some cases at high enough ppm to cause potential adverse health effects, whether by displaced oxygen or co2 toxicity if someone were in the "barn". Is it a good idea for...

Basemetal, weldmetal, HAZ? ---------------------------------- Not making a decision is a decision in itself

20 hours of real work, 20 hours of engineer babysitting. ---------------------------------- Not making a decision is a decision in itself

I think there are too many people early in their career who need to retire from engineering and move into another field that suits them better. You know, the folks that create a net positive amount of work that are better served pursuing careers in sales. Most of the greybeard engineers I've...

Not necessarily directly applicable to your application, but CGA G-6.1 section 8.3 discusses the use of stainless socketweld fittings in "dry" CO2 service. In general if given the choice, and availability of a competent welder that will pass the 5%RT, I would go with BW fittings due to lower SIF...

For vermiculite, you are referring to perlite which was used with a lot of older cryo tank vacuum space designs. Almost all modern cryo tank designs use aluminized mylar MLI insulation instead as the net heat load is much less. ---------------------------------- Not making a decision is a...

I believe credit in ASME for cold stretching cannot be used when MDMT is below -320F, as the case is with LH2 tanks (-425F). I've seen some 150 and mostly 175 psig MAWP LH2 tanks in service. Obviously the tank operating pressure is much less than that under normal circumstances. Not only do...

If you have no experience with liquid co2, you need to be very careful, there are some serious hazards that you may be unfamiliar with, such as ice blocking during system depressurization. The saturation temperature at 285 psig is about -1F, so at 20F you definitely have gas. If you are using a...

If you are a senior in college you should be making your own life decisions without consulting your parents or doing things to please your parents. You need to find a goal of where you want to be in 4 years. Then reverse engineer the path that will get you there. Having a plan is always better...

I get tired of not wasting 1.5 hours of my day in traffic and the money for a bi-weekly gas fill up. Not to mention the increased work efficiency and less time wasted by the water cooler creatures that insist I hear of the latest misadventures of their cats. Yes, working from home has been...

First of all, you need to understand what design codes are applicable to your case DOT, ASME etc. If you have no experience with cryo tanks, I wouldn't recommend starting without fully understanding existing designs. It would be very easy not to plumb particular lines such as the diptube or...

The flexibility and stress in a straight run of pipe between two anchor points is easily determined; why would you use this formula? In your case for a straight run with no displacement, if L and U are equal, y should be 0 and the equation becomes indeterminate. If you find you have...

Not familiar with Alabama in particular, but when I filled out my experience record I made sure to list each major project include the start and end dates and also made special mention if any applicable codes and/or standards used along with the "I designed X..." statements. Some states are...

While these PE stamp requirements you listed may be applicable to civil/structural functions, there may also be additional PE stamp requirements for things like HVAC systems in hospitals and pressure vessel designs IAW asme section viii div2. My point is that without a scope listed all we know...

In general some private customer specifications as well as some municipalities may require some documentation to be pe stamped in addition to any such requirements from the state. I would think such a list would be highly dependent on the nature of the work and project. The list may be very...

Woof thats a large vertical LIN tank. 15,000 gallon LIN tanks are around 43 ft high and a 10ft VJ OD, so I'm guessing this is around a 30,000 gallon tank. It may also be the case that in this low of a seismic region that the empty tank with wind load may be the governing load combination for...

In cryogenic tanks saturated conditions (equilibrium) is practically only achieved at the liquid vapor interface. In reality there is thermal stratification in the liquid giving some degree of subcooled product at the bottom of the tank. If you do a volume balance on the cryogenic tank you will...

Superconducting particle accelerators use resonance for the niobium cavities in the cryomodules. ---------------------------------- Not making a decision is a decision in itself

See K302.2.2(b) "Piping components that do not have allowable stresses or P-T ratings shall be qualified for pressure design as required by K304.7.2" ---------------------------------- Not making a decision is a decision in itself