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Latexman & sshep & those who had responded: Thanks a lot for your help. I am estimating a hypothetical vapor release for a PHA study so all your pointers have been top-notch for me. I guess my approach will be conservative for the study. And since I'm new to the organization, I cannot be sure...

Mbeychok & Montemayor, Thanks a lot for the pointers. I guess I had not been a good student during my college days and been away from Thermo for years to remember how to tackle problems of this nature. Nonetheless, I am grateful for your responses and continued patience. This is what I have...

Latexman, Thanks for the feedback. What additional information will be required to calculate the flow through the opening? The conditions supplied so far: Atmospheric boiling point = 250 degC Temp of liquid before 50% opened gate valve= 280 degC Pressure of liquid before gate valve= 2 bara...

Montemayor, The atmospheric boiling point is 250 degC, but the liquid is at 280 degC at 2 bara. This is the condition of the liquid and yes, I am trying to say that it is at saturated state. Sorry for the confusion. Thanks Wiz

Folks, Thanks for your inputs. Perhaps I used the wrong word for "superheated". This is a hypothetical question. To Latexman: it is assumed to flash all into vapor To Montemayor: atmospheric boiling point is 250 degC, T = 280 degC, P = 2 bara To sailoday28: thanks for the side info To...

Hi, I would like to ask for help on a vapor release calculation. A known superheated liquid at temperature T and pressure P, flows through a 50%-opened gate valve to atmospheric pressure in a 6" pipe. The liquid then flashes, travels 1m through the 6" pipe and is then released out of the...

Hi, I have 2 pellet lines utilizing dense phase positive-pressure conveying systems. Both lines have the same conveying distance. Line 1: Products: 95% are surface lubricated Conveying line geometry: after exiting from RV, the 4" pipeline travels horizontally for 10 metres before making a...

Sorry for the lack of information. The primary objective is to prevent the RV from lifting. So I guess a control valve will be a solution.

Thanks, TD2K. Is a control valve inevitable for a liquid service?

I am looking for options to reduce the demin water pressure from a 8 barg header to about 5 barg for a downstream process unit. The downstream unit has been designed to work with a low pressure rating and there is a relief valve set at 5.5 barg. Anybody got any sugestions on what can be used to...

Hi, I'm in the process of procuring an air drying dessicant. The dessicant is housed in two towers which is sequenced to alternate to dry the incoming compressed air. The dessicant used is activated alumina. My process requirements: Airflow: 1000 m3/hr Incoming dew point: 29 degC (tropical...

Hi all, I'm looking for references/books on how to plan and budget for annual capital expenditure for new equipment / eqipment upgrades on the scale of a single existing plant. Please let me know if you have any recommendations. Thanks

** smile1, thanks for the very insightful comments. I don't think I can conclude that static is not the problem because it is visible on the classifier screen, neither can I conclude it's the main cause. But it must be one of the contributing factors. Regrettably, I haven't have the chance to do...

One thought came to mind though, why can't static in this case be removed through the usual earthings on the hopper/equipment?

Dear smile1, Thanks. But the funny thing is that we have another line with exactly the same line-up but it does not show such problems at all. Strike any note? Let me know pls. Thanks. Dear spettitt, There is a air-leak pipe leading from the side of the RV housing to the top of the hopper. I...

KRECian, yes, that has been checked, no signs of bridging. As an additional step to prevent product buildup, we have been operating the hopper at empty level, i.e. what comes in goes out immediately. The product buildup is more frequent for non-surface-lubricated products than for...

One additional point is that the pellets are transported via dense phase conveying and when the product builds up in the surge hopper, increasing the airflow helps to clear the build up. Thanks

Hi, Plastic pellets in my company sometimes build up in surge hoppers even though the rotary valves below the surge hoppers are running near maximum speed. (The rotary valves are not under-designed for this application.) One possible root cause is that the clearance between the rotary valve...