Answer Posted / 7207502748

Examining the following factors should allow for a reasonable evaluation of cooling towers:
1) Purchased cost
2) Installed cost
3) Fan energy consumption
4) Pump energy consumption
5) Water use
6) Water treatment costs
7) Expected maintenance costs
8) Worker safety requirements
9) Environmental safety
10) Expected service life

What is some good advice for specifying allowable pressure drops in shell and tube exchangers for heavy hydrocarbons?

1145

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Are there any methods of preventing cracking of carbon steel welds in refining environments?

1045

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Is there a quick rule-of-thumb to estimate a gas side heat-transfer rate inside the tubes of a shell and tube heat exchanger?

1097

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What are some common problems associated with dense phase pneumatic conveying?

1005

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white rust formation over zinc plated and yellow passivated fasteners during CED painting. WHY?

2502

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Explain what is the method involved in analyzing powders for composition?

1138

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Are there any alternatives to scraping a shell and tube if a capacity increase will make the pressure drop across the exchanger too large?

1255

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In Galvonised iron and stainsteel pipes, in which pipe friction losses will more and why ?

2637

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What are some good uses of low-grade steam at 12 atm and 1920c?

1066

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Explain why is a vacuum breaker used on shell and tube heat exchangers that are utilizing steam as the heating utility?

1014

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What is the practical particle size limit for pneumatic conveying?

1098

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what is first order of reaction?

1690

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How to size the cooling tower sump / basin for any given circulation rate? What is the guideline?

3081

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Hi, I am Gurunathan. I am in need of ONGC, IOCL, DRDO technical test ( chemical engineering)and general aptitude questions. If anyone has kindly post it to me soon.

2806

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Explain some common piping materials used to transport slurries?

1077

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