Questions tagged [process-engineering]
Process engineering focuses on the design, operation, control, and optimization of chemical, physical, and biological processes.
81
questions
-1
votes
0
answers
15
views
ISO symbol for regulatable weighing belt
I want to know how to symbolize (in accordance with ISO standards) a conveyor belt that weighs mass in comparison to some set-value, whose speed is then regulated in order to achieve the mass flow ...
- 143
1
vote
0
answers
29
views
Heat Transfer in a tubular reactor with constant jacket temperature - impossible solution?
I have received from my professor the following problem:
A first-order exothermic reaction A -> B takes place in a tubular reactor (typical PFR). The tube is cooled to a constant wall temperature $...
- 11
1
vote
1
answer
40
views
Under what conditions is grinding unnecessary for liquid-solid leaching in mineral processing?
I am a chemical engineering student and I am having trouble understanding a passage in a separation process textbook I am reading. The passage is about the preparing solids for leaching, such as ...
- 13
1
vote
0
answers
53
views
Method of separating oxygen from a mixture of oxygen + carbon monoxide
I have a 99,9% oxygen, with 0,1% is CO. Is it possible to separate the CO from oxygen in this mixture? The closer the percentage to 0 for CO, the better.
I've read about separation of oxygen from air, ...
- 355
0
votes
0
answers
65
views
Calculating gas volume in a gas-liquid system/pressurized vessel
There is water in a tank and the tank is connected to a piece of piping that has a volume of 2.5L.
The headspace above the water is pressurised by using air, to a pressure of 3 bar (a).
What happens ...
- 13
0
votes
0
answers
29
views
Relationship between the height of the filter cake and the applied solution
Situation
When a solid is applied to a suction filter for filtration, a cake is formed which is washed with the help of washing water. The filtrate flowing through contains the parts of the solids to ...
- 101
0
votes
1
answer
143
views
How to mix pure CO2 with air so that a bioreactor can be fed with air at 0.1% to 10% CO2?
The situation is we have to prepare a gas mix of air and CO2 which has to be given as input from 0.1% to 10% CO2 of air mix to the aqueous medium in a bioreactor?
I'm trying to build a simple and ...
- 23
0
votes
1
answer
67
views
What type of electrical machine component for counting time?
I am looking for the proper piece of hardware to do what I'm looking for on my current prototype machine build.
I want a timer to begin counting upwards in seconds when a switch is activated, and ...
- 434
0
votes
0
answers
25
views
Process disturbance in PI controller help
This is the project i'm working on and i'm struggling to understand one sentence which is stopping me from progressing the project.
I'm struggling to understand what it means when it says to add +/- ...
0
votes
1
answer
27
views
What is the fouling effect (in rate, foulant thickness) of sand inside tube side of a shell and tube heat exchanger?
I am working with RO reject which has high turbidity (mainly insoluble salts and also sand now). This is also my process stream and needs to go through a heat exchanger at 50-60C and flowing at 0.25m/...
1
vote
1
answer
84
views
Does P&ID have cross-reference same as electrical drawing?
In electrical i usually use cross-references to identify their symbols locations, I am still yet a lot to discover P&ID. So my question is, does P&ID have this such of thing?
0
votes
0
answers
36
views
P&ID questions on reports, connection, etc
Good day to all of you. I got some questions in my mind regarding on P&ID:
In electrical, symbol will have their own default reference name for example "Motor" will use "M" , ...
0
votes
2
answers
37
views
Gas Seal for slowly turning shaft
I am working on a small waste treatment project where there is a small mixing vessel (about 5 liters - more or less 20cm diameter). The mixing process produces methane gas which shouldn't escape the ...
- 22.6k
0
votes
2
answers
138
views
How to manage two control loops as safety when BPCS is shared?
I am trying to wrap my head around some excerpts from:
CCPS Layer of Protection Analysis
CCPS Guidelines for Independent Protection Layers and Initiating Events
IEC 61511
I am trying to understand ...
- 133
0
votes
1
answer
84
views
Recommended books for process engineering? [closed]
I made a career change from machine design to CNG processing. What I’m looking for are some good books/handbooks that cover the following topics. Something similar to Machinery’s Handbook.
Piping, ...
- 53
1
vote
2
answers
2k
views
Identification a Symbol for P&ID's Standards
i have a question regarding on PID standards ISO 14617. Below is the attached symbol graphic, i seem cannot find anywhere what actually this symbol refer to from standards that i have looked up; PIP, ...
-1
votes
2
answers
23
views
Safety stock - how to determine how many multiples of the standard error measurement one should use?
I am trying to work out the best formula to use for calculating the safety stock to be used in Heijunka/production levelling.
According to this article, the best approach is to use the root mean ...
- 99
-1
votes
1
answer
47
views
Crossflow HX tube and fin, derive Tout hot side as a function of mdot hot side in
Apparatus:
Crossflow Tube and fin HX. (liquid-to-air Intercooler),
Hot Side: Tube side, gas flowing internally
Cold Side: fin side, water flowing in crossflow
Goal:
Generate an environment in "...
1
vote
0
answers
36
views
Reading a value off a screen with a camera
I'm looking to log some information on a piece of equipment I have running at home. It displays the information I want - operating rpm and some other settings - on seven-segment displays. In an ideal ...
- 11
2
votes
0
answers
36
views
What's the best type of steam Trap for Superheated Steam?
Process Engineering Newbie here.
What kind of Steam Traps are best suited for condensate removal in super-heated steam line or manifold?
The super-heated steam is to be supplied to a process reactor ...
- 113
-2
votes
1
answer
56
views
Thrust by turbo fan jet engine
How much thrust can I produce with a turbofan jet engine without injection of fuel and with just compression of air, which will be heated by convection if initial temperature of air of 20 oC and its ...
2
votes
0
answers
20
views
Custom Models in Process Engineering
I'm using Aspen Custom Modeler to create a model to be used in Aspen Plus and Aspen Plus Dynamics, and I'm having trouble figuring out how to code the mass balance, energy balance, etc. I'm ...
- 21
1
vote
2
answers
53
views
How to add a controlled amount of a nutrient solution to a water line
I have an existing water supply system for the cattle on my farm whereby 6 troughs located in different fields are all fed from a common header line.
The pressure in that line ranges from 3-5 bar (It’...
- 111
1
vote
2
answers
50
views
Choosing Pressure Vessel head
Can I use a conical head at the bottom for a small diameter steam manifold ( Schedule 40- 3 inch dia. and 2 inch dia. ) that needs to operate at high temperature (~450 deg Celcius) and High design ...
- 113
9
votes
2
answers
10k
views
Block diagram vs flow chart?
I was studying a book on control systems where I read that a block diagram is a specialized high-level type of flow chart.
What is the difference between a normal flow chart and a block diagram?
- 213
0
votes
1
answer
175
views
Solving a linear mass balance equation in the form of Ax = 0 with variables in vector x
I have been tasked with solving a series of linear equations in the form of Ax = b, where b is the zero vector. Specifically, I have a matrix E which is 4x7 and a column vector r which is 7x1, as ...
0
votes
1
answer
67
views
How exactly do noise canceling headphones work?
I purchased a pair of noise canceling headphones today and I was just wondering how exactly they are able to cancel out background noise?
0
votes
1
answer
352
views
Custom User Models in Aspen Plus
I'm trying to simulate a purifier in Aspen Plus in a cryogenic system. This purifier is just meant to change the pressure of the outlet stream based on the inlet flow and pressure (we are using the ...
- 21
1
vote
1
answer
310
views
Modelling reactor jacket with or without insulation, how to proceed?
I am currently trying to derive a model to help estimate as precisely as possible how much time can be saved by insulating the jacket of a reactor used for eating and cooling.
EDIT: I edited my post ...
- 123
2
votes
0
answers
58
views
When teaching separation processes, which one should be introduced first? Distillation or absorption?
I am preparing a basic course on Separation Processes (5th semester, BSc Chemical Engineering). I can see that many well-known textbooks (e.g. Seader & Henley, Wankat) start by teaching in detail ...
- 335
0
votes
1
answer
27
views
Entrainers to distill MTBE from Methanol? - Chemical Engineering Question
What have you found to be some effective entrainers to distill MTBE from Methanol, given the azeotropic conditions at 67%. I have tried to simulate 1-butanol, as well as ethanol, and numerous other ...
- 101
1
vote
1
answer
67
views
How to create a Liquid tight cable seal in a fuel storage tank
I am working on a telemetry system where a liquid level sensor (Hydrostatic pressure sensor) is used to monitor the volume of fuel (gasoline / diesel) in an underground storage tank.
The sensor has ...
- 113
3
votes
1
answer
74
views
Designing a Chilled Process Water System for Small Plant
I am designing a new, closed loop,chilled water system for our small injection molding outfit and can use some help where to begin. Here are some of my knowns:
Northeast NJ, USA, no air conditioning. ...
- 434
4
votes
1
answer
121
views
Modelling gas desorption from a still solution (e.g. a beer)
The common way to model or estimate gas (e.g. CO2) desorption rate from a liquid solution is by using an equation similar to this one
$J_{CO_2} = -k_L a(H·C^G_{CO_2} - C^L_{CO_2})$
where $J_{CO_2}$ ...
- 335
0
votes
1
answer
37
views
If I replace a flow orifice with a Coriolis flow meter of the same size do I need to worry about pressure drop with the new Coriolis meter?
I have a 3 inch line with a 1.5 inch flow orifice. If I take out the flow orifice and put in a 1.5 inch coriolis meter will the pressure drop be the same or better with the new coriolis meter than ...
1
vote
2
answers
978
views
Can Fortran 90 be used with Aspen Plus, or only Fortran 77?
I am attempting to write a user model in Fortran that can be connected to the Aspen Plus process simulator. Can Fortran 90 be used, or does Aspen only work with the older Fortran 77? I have checked ...
- 21
0
votes
3
answers
120
views
How to find the balance position of valve downstream a tank?
We have a tank which has a constant inflow of water (Qi). The level (h) of water in tank is controlled by opening/ closing (l) a valve downstream of the tank. Overflow height of the tank is 4 meter. I ...
- 1
0
votes
1
answer
60
views
How to identify the time delay of manipulated variables which are important to the final quality of polymer product
In a polymer production process, there are a lot of manipulated variables(MV) such as temperature ,pressure , or level of reactor that affect the quality of my polymer product.
However, it usually ...
- 1
6
votes
2
answers
92
views
Does every engineering design needs to have a complete theoretical backing or may experimental data suffice?
This may sound rather vague on its own so I will explain with examples.
The solid booster rockets used by NASA space shuttle used a central bore design because it had a certain characteristic on ...
- 163
4
votes
1
answer
223
views
Real world applications where one would use a force function in PLC programming?
I'm curious about which scenarios one would use a force function when using a PLC programming interface. Examples pertaining to process engineering, manufacturing, or industrial settings would be ...
- 43
1
vote
0
answers
44
views
Industrial machinery and equipment [closed]
I am a mechanical engineer who is interested in learning different processes and equipment mainly used in process industry namely, textile, chemical, sugar mill, and other food process industry.
Is ...
- 21
1
vote
2
answers
55
views
Is there any method to recycle air-pollution into fertilizer?
Vehicles and Factories produce air-pollution like Nitrogen Dioxide(NO2) and Sulfur Dioxide(SO2).
Plants use Fertilizer with those same compounds (NO2 & SO2)
So, by what method can air-pollution ...
- 111
1
vote
0
answers
512
views
How to use VBA on Aspen Hysys? [closed]
I am trying to write a program on Aspen Hysys. Hysys has a script manager to write scripts using Visual Basics for Applications syntax. Having no background in VBA, I'd like some help to:
Import the ...
- 19
-1
votes
1
answer
236
views
How does an industrial engineer develop a process? [closed]
I would like to know what industrial engineers use for planning and developing a process:
What is the most widely business analysis modeling language used (Think ...
- 151
0
votes
2
answers
415
views
Valve first,then heat exchanger OR heat exchanger first then valve
In my exam, I was given 2 options to design a process. Assuming a saturated liquid coming out from the separator, A) should the stream pass through a valve to reduce pressure, then to heat exchanger ...
- 1
0
votes
1
answer
98
views
How do you get a closed vessel to >90,000 psi internal pressure
Im trying to build a cold isostatic press with a internal vessel area of 300mm3.
A cold isostatic press forms green metal components using pressures greater than 90,000 psi.
Using an oil or water/...
0
votes
1
answer
113
views
Boiling Point, Pressure and Distillation
I have a line in my text that states the following:
"For systems with low boiling points (e.g. Ethane-Ethylene, propane-propylene etc.), high pressures are used so the vapour leaving the column at ...
- 9
3
votes
1
answer
272
views
Chemical Engineering Process Analysis - Process Flow Calculations using linear matrices
I am doing a process flow question and trying to calculate the grams of $\text{C}_{10}\text{H}_{14}$, $\text{C}_4\text{H}_6\text{O}_3$, and $\text{C}_{12}\text{H}_{16}\text{O}$ produced during a ...
- 31
5
votes
2
answers
310
views
What is the correct pipe size for a 2inch pipe?
I'm was looking into the ASME B16.5Pipe flanges and pipe fittings and it has 2 dimension tables metric and inches.
What I found was rather strange for me. I was ...
- 322
1
vote
1
answer
90
views
How do you calculate the required power of a disk turbine (Rushton turbine) to rotate a fluid at a given speed?
I am designing a potato peeler which is practically a bucket that has a rotating disk (figure below) at the bottom driven by a motor. Water and potatoes are put inside the bucket and the disk rotates ...
