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If I pad a full 90-ton chlorine tankcar with 100 psig Nitrogen to a process, when the tankcar empties (bottom diptube), will there be Nitrogen present immediately in the gas sream? Or since Cl2 is heavier than N2, will Cl2 gas still be expelled until the partial volume is exhausted? If so, how...

We are having a "Safety Day" at our plant and I wanted to do a demonstration that would show how difficult it is to do something with monovision (loss of one eye) vs. stereo vision. However, an internet search has come up with nothing. Does anyone have any ideas?

I have a large silo constructed to the API 620 standard which is rated for 3.6 psig MAWP at 176 F. The top of the silo is 100 ft. up and we have a very heavy 20" 150# manway cover on top that we would like to replace with a fiberglass manway cover to make access easier and also because we would...

I have a large silo constructed to the API 620 standard which is rated for 3.6 psig MAWP at 176 F. The top of the silo is 100 ft. up and we have a very heavy 20" 150# manway cover on top that we would like to replace with a fiberglass manway cover to make access easier and also because we would...

We have an incoming nitrogen meter which has been configured by the factory to read "SCFH". This is at roughly 150 psig and ambient temp. The nitrogen is further regulated down to 36 psig, and another flowrate is taken, also supposedly in "SCFH". However, the upstream meter reads about 1700...

Either way, API 620 or ASME Section 8, it still requires a relief valve - correct?

Pleckner, thanks for your help. I reviewed the design and stress calculation sheet again, and I am confused. The nameplate MAWP is 3.6 PSI (all pressure values given are in 'PSI'; I assume that means psig), but further down in the calculations it states that the design pressure is 3.6 PSI but...

A plant is constructed with silos to store the finished dry resin product. The silos are 8900 cu. ft. capacity, SA516 gr 70 material, design pressure 3.6 psi, static head 24 psi. The silo was constructed per API 620, and is ASME code-stamped. Material is to be pneumatically conveyed to the...

A plant is constructed with hoppers (silos) to store the finished dry resin product. The silos are 8900 cu. ft. capacity, SA516 gr 70 material, design pressure 3.6 psi, static head 24 psi. The silo was constructed per API 620, and is ASME code-stamped. Material is pneumatically conveyed to the...

I have a pressure vessel which has a MAWP of 50 psi/FV at 350 deg F. It is also stamped with a MDMT of -20 deg F at 50 psi. Does this mean that the MAWP of 50 psi is good for the range of temperatures from -20 to 350 F?

Is a U stamp required for a non-pressure vessel which has a pressurized jacket?

Thanks Doug. I've taken care of the tube side PSV sizing. On the shell side, there is a bypass valve around the sat. steam regulator. What if this were to be inadvertently opened while the shell side was blocked in? Is this not a relief case? Also, I take it from your first paragraph that...

What table do you use? Do you have a link?

I have a new heat exchanger with both shell and tubes 304L and rated at 150 psi @ 350 F, water on tube side, steam on shell side (ASME Section VIII, Div 1). Does the MAWP change if the operating temperature is 160 F? How can I calculate it? Is there a graph or equation? Steam will be...

I have a new heat exchanger with both shell and tubes 304L and rated at 150 psi @ 350 F, water on tube side, steam on shell side. How can I calculate the pressure rating of the tubes at 160 F? Is there a graph or equation? Steam will be regulated through a control valve, but max. upstream...

Any one here know 6 sigma/DOE? I want to do a 4 factor study, but only 2 variables can be used at a time. The 4 factors are catalysts for a reaction, but ideally we only want a combination of two for the final mix. This doesn't lend itself to factorial designs because all factors have to be...

What is the current average cost of standard 1" CS and SS steel pipe? Is there somewhere on the web where I can find this for other pipe sizes?

We have a large gasholder which stores recovered VCM, with water providing the seal. The annular space is open to the atmosphere and we wish to reduce emissions from the water/VCM mixture. We've tried ping-pong balls, but they tended to blow out of the space. Any other proven ideas? If we use...