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Hi all, I need some help with chilling system. I understand there are a few types of absorption chiller units using different refrigerant e.g. lithium bromide and freon etc. However, all these require cooling water/ sea water. Are there available technology in the market such that we do not...

Dear all, I would like to ask about liquid thermal expansion in a blocked section of pipe. I'm wanted to calculate the estimated pressure rise in a pipe and have searched through the internet for information. I found that we can do so by using: dP = expansion coeff * dT / isothermal...

Dear all, I would like to ask for some advise regarding thermal expansion of liquid in a pipe. There are 2 cases: 1) For liquid trapped in a pipe without external heat source except from the surrounding, I want to know how can I calculate the increase in the pipe pressure if I know the...

Hi, Flue gas from incinerator goes through to a stack whereby the gas is 'sucked' through a venturi srucbber and scrubbed with low purity water to remove any dust particles in the gas. Recently we experienced the section just above the gas inlet nozzle to the stack thinning off and it was...

Hi, For purification column operation, if the feed rate to the column is increased in order to increase top side draw of high purity product, what should be the change to reflux rate, reboiler steam input etc to ensure that there's no flooding in the column? WHat do I expect to see in the...

Hi all, I have an issue with control valve controlling level in upstream vessel. Deviation of pv value from sv value is approximately 2% and yet the valve output (mv) hunts from 0 to 100%. Is this a valve mechanical problem or controller setting problem (PID control)? Thanks.

May i know why dissolved O2 in water system can cause corrosion problems in pipes e.g. pitting?

Hi all, For waste water stream discharge from incinerator to open sea, i need to design a strainer to filter out the particles in waste water stream that comes from castable dropoff and also salt content in incinerator. pls advise how should i determine the mesh size required and what's the...

Hi all, I have this problem: incinerator to burn wastefeed that contains up tp 40% glycols. According to this composition variation, I have established a set of conditions to operate such that CO emission lies below the legal limits. However, recently, it is found that frequency of chokages in...