I knew I'd seen it some place familiar! Thanks very much. (By the way, not knowing how soon someone might have the answer, I continued to do some looking elsewhere and found a copy of a thesis on line that presents both the Redlich-Kwong and van der Waals EoS in volume-explicit form.)
The key...
Surely someone out there has gone through the algebra required to yield a volume-explicit form of a cubic equation of state. That is, I'm looking for a form using T and P as independent variables as an alternative to the commonly-seen pressure-explicit form that uses T and V as independent...
This is probably so basic it's embarrassing but I'm missing something somewhere along the line.
Say you have a large reservoir (like a railroad tank car) hooked up ultimately to a vertical pipe, the upper end of which is open to the atmosphere. Conceptually the system is described by a single...
What I'm looking for is a literature correlation that estimates the quantity of a residual amount of viscous fluid in a horizontal pipe after flow ceases and the line is allowed to drain at least superficially. Say, for example, we have a 560 SSU oil pumped in a horizontal 3" line; the pump is...
This may be somewhat unusual: what technology/technologies would you suggest as a starting point for removal of hydrogen as a potentially valuable byproduct from an organic vapor stream at about 25 psig and 400°F? The organics present are all C2 oxygen-containing species; the process is a...
Some time in the mid-1990s (I recall), an article was published that demonstrated a histogram-based method for sizing storage / surge tanks for utilities (e.g., demineralized water) for batch processes. This method took into account the fluctuating rate of withdrawal of the utility and the...
Here's the situation: a new regulator is to be installed on a nitrogen line that feeds several vessels (and no other users!) for pressure transfer and line purging. EACH ONE of the vessels thus fed has a dedicated relief device that is appropriate for the vessel in question. Thus: I don't...
Here's the situation: there is a stainless steel vessel outfitted with half pipe jackets that ordinarily use 150 psig saturated steam to heat the vessel contents. On occasions, the batch recipe calls for a cooling step (using cooling water, which yields heat to the atmosphere by way of a...
I can rationalize including reboiler piping on a distillation unit: seems to me the thinking is that a pool fire would necessarily involve both the column and reboiler, and that such piping would be entirely within the "equipment" envelope.
That said, it also seems to me that it's reasonable to...
API 521, §5.15.1.1 is not definitive as to whether or not associated piping is included in the calculation of the area for impingement of a pool fire. In fact, it essentially says that it's at the discretion of the user.
I'm trying to find out what standard / common practice is; that is, does...
I'm looking for a rule of thumb/set of such rules covering the purchase price and installation costs for cellular glass insulation on a process vessel (the vessel dimensions are already well established), including sheathing (in this case, stainless steel). Peters & Timmerhaus give graphs...
I've tried several searches to find either an analytical or empirical method to derive the wetted surfaces of torispherical heads on a partially filled horizontal vessel, with no luck so far. It's safe to presume that the key vessel dimensions (inside diameter; crown radius; knuckle radius...
You're pretty much on target in considering API 520. If you look at §5.8.1.4 and 5.8.1.5 of API 520 (8th edition from December 2008), you'll find a fairly explicit method for sizing relief valves for viscous liquids. A worked example problem follows immediately. That ought to step you through...
Could you be a bit more specific, please, as to what you want help with? If, perhaps, you're looking for general guidelines / rules / sizing equations, I'd suggest consulting API RP 520 (part 1) and 521. Those documents provide plenty of details in concise language.
If, after that, you have...
