Online Calculators

Cool link, Thanks

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.

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

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.)

Could you explain how have you applied and benefited?

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.

Can you share the example or calculations?

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

Great link. Thank you.

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

Ditto!

Great sharing for all engineers

Thanks

A very good one. Many thanks Wareagle!

Hai,

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

Regards

Hanu

I can not open some the calculator sources

Obrigado!