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Guru
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Online Calculators

05/31/2010 8:29 PM

You may be interested in these online calculators

On line Calculators

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Guru

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#1

Re: Online Calculators

05/31/2010 8:55 PM

Cool link, Thanks

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Guru
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#2

Re: Online Calculators

05/31/2010 10:17 PM

Another good one is the Industrial Refrigeration Consortium (IRC) ASHRAE 15 pipe segment calculator, which uses the Colebrook formula to calculate pressure drops in relief valve discharge headers.

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#7
In reply to #2

Re: Online Calculators

06/02/2010 1:36 AM

What are your interest in Industrial Refrigeration Consortium? How have you benefitted?

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Guru
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#10
In reply to #7

Re: Online Calculators

06/02/2010 3:18 AM

The Industrial Refrigeration Consortium seems to be an academic/industrial relationship between the University of Wisconsin (Madison) and various industrial refrigeration users. I don't know, but I suspect that a key associate in this is the Oscar Mayer plant, also in Madison.

This 7-story brick plant was built in 1927 or so out among the cattle fields on the outskirts of Madison. The building has several large rooms cooled with bunker-pipe ammonia coils, plus various freezing equipment. The ammonia inventory is on the order of 250,000 pounds. Since the inception of this facility, the city of Madison has grown up all around it. There are now motels, businesses, hospitals, schools, the airport, and residences in the neighborhood.

Because of this, the plant has one of the most professional and serious safety programs I have ever seen. One of the issues that comes up in PHAs (Process Hazard Analyses) and piping codes is the performance of relief valve discharge headers. If the piping in these headers creates too much back pressure, the relief valves may not function at rated capacity.

The ASHRAE 15 code for relief headers is now based on the Colebrook formula, which is iterative and rather complex. The University of Wisconsin has built a spreadsheet that uses this formula to calculate the pressure drops in individual segments of relief headers, and this is available on line through the IRC. I have benefitted from this in my work for various ammonia refrigeration plants.

(It would be interesting to see this applied to the Oil Spill, but I don't think enough data is publicly available.)

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#13
In reply to #10

Re: Online Calculators

06/02/2010 4:11 AM

Could you explain how have you applied and benefited?

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#15
In reply to #13

Re: Online Calculators

06/02/2010 4:51 AM

I needed to know what the pressure would be at various points in the relief discharge system. That program enabled me to calculate those values.

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#16
In reply to #15

Re: Online Calculators

06/02/2010 8:33 AM

Can you share the example or calculations?

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Guru
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#18
In reply to #16

Re: Online Calculators

06/02/2010 11:11 AM

For that and several other useful downloads, visit http://www.irc.wisc.edu/?/download

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#3

Re: Online Calculators

05/31/2010 10:45 PM

Great link. Thank you.

For capacitor-switching contactor applications, here is a good one : ABB Capcal

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#9
In reply to #3

Re: Online Calculators

06/02/2010 2:08 AM

And a 5 star rating for the thread from me

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Guru
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#4

Re: Online Calculators

06/01/2010 5:27 AM

Ditto!

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Guru
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#5

Re: Online Calculators

06/02/2010 12:02 AM

Great sharing for all engineers

Thanks

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#6

Re: Online Calculators

06/02/2010 12:09 AM

A very good one. Many thanks Wareagle!

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#8

Re: Online Calculators

06/02/2010 2:06 AM

Hai,

Excellant Information...it is very useful to all.

Regards

Hanu

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#11

Re: Online Calculators

06/02/2010 3:34 AM

I can not open some the calculator sources

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Guru
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#12
In reply to #11

Re: Online Calculators

06/02/2010 4:10 AM

You may be taking nap during opening those!!!

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#14

Re: Online Calculators

06/02/2010 4:35 AM

Obrigado!

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#17

Re: Online Calculators

06/02/2010 8:57 AM

War Eagle!!! AU '92

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