Recent content by Jobst

I remember seeing something like this at a large milk processing plant. There was demand for both heat and cooling, at relatively mild temperatures, and someone had worked out that the duty of each was about the same, but only when averaged over a few hours. So they installed a huge tank that...

I mean something like shown here, labelled as "perforated distribution baffle".

Hello all, Can anybody point me to any references for design of calming/stilling baffles in two phase separators? My particular application is for a horizontal separator, to even out the flow profile in the liquid directly beneath the inlet device, before it flows into some internals. Mainly...

Thanks everybody for your comments. It's been a while since I've had to do more than very standard hydraulics, appreciate the discussion. I've set up some calculations treating the orifices as individual "pipes". The calculation has three components: entrance loss, frictional loss along the...

Hole spacing is on the order of 5-20x hole diameter. There's a bunch of plate permutations to be tested. Flow and dP data for existing setup is ok (and close enough to what I calculate), but plate is much thinner. Correlations I'm using so far don't account for plate thickness/hole length...

Similar - though my plate is flush with the top of the vessel. And I have a lot more holes in the plate!

The orifice plate is actually discharging into a pressure-controlled vessel filled with gas, so not your typical pipe flow situation. Flow through the plate is controlled, I need to make some changes to the plate and verify if the pump will still be capable of the job across the flows needed.

Hi All, I have an issue where I'm trying to estimate the pressure drop of a liquid through a multi-hole orifice plate. I know how to do this for a "thin" plate, i.e. thickness/hole diameter <= ~1, but am having trouble finding methods for a thick plate where the aspect ratio of the holes is...

I would contrast this with the case where a BPCS loop is managing something 100% of the time during the year: the probability of that failing, per CCPS, is 0.1/year. Now, what is different about the loop in question, that it is only operated for a few hours (or tens of hours) in a year, but has...

What's stopping you stretching some kind of sock filter over the top of your funnel?

Can you make a slurry out of the powder beforehand (or pre-dissolve it in some substance) before adding to the tank? Or encapsulate the powder in some material soluble in, but not harmful to the tank's contents? Any feed lines or exterior circulation loops where you could add a venturi feeder...

That sort of boils down to whether people are aiming for "equality of opportunity" or "equality of outcome". I've noticed that certain groups pay a lot of lip service about providing the former, while ignoring or refusing to believe that a lot of systemic biases still exist that prevents the...

If the column is working as intended at design point is there really a problem with not having a redistributor? I would investigate, document, and file it away for when it is actually causing a problem.

CS2 is on that list at 90°C. Unfortunately Perry's doesn't have any discussion on treating mixtures of gases with a single combined autoignition temperature. You're right though, in that most of the gases in that table are in a similar range of temperatures, and if I had a mixture of a few of...

Hi All, Can anyone point me in the right direction for dealing with trace components in a gas mixture, and whether these need to be taken into account when determining temperature code for equipment? E.g. I have a gas where the bulk components would warrant T2 (<300 °C). However, there's <100...