Excessive pressure drops may occurs, ex. the rated folw of liquid relief valve may be siginficantly higher than the required flow, cause a very high inlet line pressure drops. In such cases, there are some methods that could be doned, such as increasing the valve blowdown. But it need to be...
Thank you for your kindly help.
Is any condesnate/steam network loop software or book to instructing me how to avoid spending a lot of time (easy to fault) to put the complicated & massive steam / condensate network, mass & engergy balance equation in to the excel?
Thank you very much.
Dear Sir
I am encountering a project that is required us to do the steam and condensate balance caluation under normal condtion / feed variation condtion / start-up condtion / shut-down condtion.
Could you please share any book or related software information allow me to do this calculation...
Dear Professional eng-tips member
I have a project required to size the inlet/outlet pipe size of thermosyphone reboiler.
And, our deisgn guide is written that the liquid vleocty to the reboiler in the range of
2 to 7 ft/s. And, the pressure drop in the line to the reboiler is requried to be...
Dear eng-tips forum members:
My new project plant capacity is scale up from 3000 tons to 6000 tons. And, new project shell and tube heat exchanger duty is scale up from 1000kw to 2000 kw. I wonder I only knew the heat excahger data sheet infromation from 3000 tons plant. How could I develope...
For wet scrubbing is the most prevalent form of control for inorganic emissions.
It is carried out in either spray towers or packed bed towers.
The inoic nature of acids, based and salts makes these compounds good
candidates for removal from air or stack gases by wet scrubbing,
because the...
Dear Sir
As we know, steam flow measurements, being compressible, always
require both pressure and temperature compensation.
But, I am confused why a steam flow meter/indincator are installed. (Please see the desuperheater with 3 control loop drawing in the attached post)
Is this steam flow...
Dear Sir
I wonder how to show the right way that the software signal from interlock to shutdwon the motor. Please see the attached drawing.
case 1 : As liquid level's low low, the singal will interlock through the pushbutton to stop the motor, and the pushbutton only be activated as interlock...
control variable with significant capacitance dealy time should be avoided. For example, tempeaure control with a large column using reflux fow. So why the case 1 is better than case 2 in this desuperheater case (attache file)?
thank you so much...
Dear Sir
Sorry to bother you this simple solenoid question.
There are two case of pressure control valve.
I wonder why we always pick pressure control valve (case 1) instead of
pressure control valve with solenoid (case 2).
In my poor undestanding about...
Dear Sir
I am sorry to bother you this simple control / alarm set point question.
Case 2 is a simple direct temperature control through a temperature sensor located downstream and send a siganl to the valve controller to increase
or decrease the water supply.
Case 1 is a complex temperatrue...
Thank you for your advise.
But I don't understand your point that overflow line is for keeping
vapors from coming out the overflow line. Istead, I think this overflow line provide a good solution for that tank water level
is overflow to tank high high level.
The plate heat exchangers are desighed for much lower fouling factors than shell and tube heat exchangers. This is due to the turbulence and high wall shear streass that fluid in plate heat exchangers exhibits. The plate heat exchangers were first come up in the 1930s,and maxiumu design...
Dear Sir
Sorry to bother this question twice.
I hope this attached drawing is clear.
It make much more senes to me as level of the tank is high,the inlet valve XV-A should close to stop more water into the tank.
Not sure my sense is right cause the licencer interlock description says that the...
I am sorry to bother this silly and trivial.
Does it is necessary that process engineer provdie low flow alarm/setpoint for this mass flow meter
considering the following process, "the acetic acid flow into the reactor"?
Also, a client requires the readout on the DCS, process engineer...
