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Hi, What is the best way to deal with this situation. About a year ago I emailed a senior engineer at my company to confirm a sizing issue. He reconfirmed the criteria and said that my work was correct. I even went one size higher than our undocumented sizing criteria to handle surge flows...

Hi all, I recently read a paper on industrial heat pumps by the DOE for applications other then just environmental heating/cooling. http://www.p2pays.org/ref/32/31234.pdf The paper whet my appetite for possible applications of the technolgy and I started playing around with some numbers. I...

Sorry I should have edited better. The sentence should say 'If you have a tank that is rated for 4" wc would it not be able to pull less air through the same sized nozzle than a tank rated for 30" wc.'

Monteymayor, I have a follow up to your recomended method for sizing a vacuum relief vent. In your method you look to make sure that the vent size is large enough so that the velocity through the pipe is less than the sonic velocity for required in-flow of air. Then you add one pipe size. My...

Stonecold: That is a definate consideration for the future. I want full vacuum or at least more than inches of water column in the future. 25362: Thank you for the link. Its ironic that someone asked the same exact question only like an hour after I did. Perhaps one of the mechanical...

Thank you moltenmetal. The final decision is not mine I just wanted to learn more for the future.

Could you all discuss vacuum relief due to steam 'collapsing' (condensing) in a tank not protected for full vacuum, which does not have an open connection to atmosphere? Vacuum protection from pump out, drain out, thermal vacuum, all seem to have relatively small vacuum relief flows compared to...

I recently completed sizing the SRV flow requirements for an ASME stamped vessel. One of the cases that I checked was for external fire causing the vaporization of the contents according to API 521 3.15. My work was then sent for review to a senior engineer. He stated that I did not need to...

Here is a quick estimation tool: http://www.dresser-rand.com/steam/calc/main.asp

Montemayor Thank you for you reply. As I’ve read through the previous posts in the engineering forums that interest me I have always found your responses quite enlightening. If you were my supervisor I could keep you occupied with many engineering questions that I have for a long time. In...

It is easier to explain my question with an example. The MAWP of pressure component (vessel/heat exchanger, excetera) is 90 psig. Pumping into the component is a pump capable of putting out 120 psig at a zero-flow condition. This condition could happen if a valve downstream of the vessel was...

Hello, ASME B31.3 gives specific exceptions which allow the pressure in process piping to exceed the recommended rating. Such as 20% for no more than 50 hr at one time or 500 hr/yr. Does such an exception exist for ANSI/ASME B16.5 code? I did not see such an exception in code book I have...

Just replying to Artis comments. A normal process pump will have problems with stock consistencies over 4-5%. A specialty pump is needed for medium consistency stock. The impeller shape of one of these pumps is specially designed to fluidize the stock before pumping it. Sulzer is one pump...

Thank you quark that is a valuable reference. Also thank you EGT01, your response pertains more to the safety concerns I had. The deadhead pressure was a specific concern for choosing flange/piping class. I had choosen the higher rated piping class and a comment was made regarding the...

Hi all, When working with fixed speed its pretty easy to determine the dead-head pressure of the pump. Just look at the pump curve for your impeller size at 0 flow. For a variable speed pumps I have been calculating the deadhead pressure at the maximum motor rpm. Is this too conservative...

JKaen, The paper you want is "Channeling in Bleach Towers and Friction losses in Pulp Stock Lines" by Vernon B. Bodenheimer Southern Pulp and Paper Manufacturer, September 10, 1969. Good luck finding it anywhere, I'd suggest University Miami, SUNY ESF, or NC state. The formula is: delta H =...