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Questions tagged [process-engineering]

Process engineering focuses on the design, operation, control, and optimization of chemical, physical, and biological processes.

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Seeking Advice: Improving Resin Application in Honeycomb Lamination for a Sustainable Project

I am trying to laminate a honeycomb structure with a fiberglass and resin reinforcement. However, I have problems because a large amount of resin falls through the holes of the honeycomb and the final ...
BeeSwell's user avatar
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1 answer
22 views

Recycled brine flow rate

How to find the water flow rate coming out of a pump? The flow rate entering the pump is 471 t/h. The pump's pressure is 3.6 bar.
rahil Artmiss's user avatar
2 votes
4 answers
85 views

Where do engineers find the manufacturing processes of objects?

I'm an engineering student and we have a reverse engineering project going on. We need to disassemble a simple object and understand how it is made: which processes are used, why, how much it costs... ...
Nigel Sheldon's user avatar
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2 answers
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How to automate this seemingly easy manufacturing process?

We are a physical bird repellent manufacturer and use stainless steel to manufacture these things: We have a fully built out infrastructure that does everything from cutting the steel strip to pieces ...
D. Richard's user avatar
1 vote
1 answer
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Selecting a vacuum pump for medium/low vaccum (~1000Pa)?

I have selected a lot of pumps/fans/compressors, but for low to medium vacuum (~1000Pa) the kinetic theory of gasses dominates and additionally there are many different types of less encountered pump ...
ericnutsch's user avatar
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How is this metal, hollow sphere manufactured?

I just came across this sculpture and am really interested in knowing how it could even be done? I thought that they put 2 hemispheres together but there isn’t any weld lines- is there any other ...
JJonah's user avatar
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2 answers
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Stress Strain Analysis In Wall

I have a 20mm thick and 10m long wall. On one side of this wall (inner) is 80 degree celcius water, the outer side is air at an ambient temp of 20 degrees celcius. My coeff of thermal expansion is 15e-...
jude's user avatar
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1 answer
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Fluid dyanmic - flow in a pipe

Dear fellow engineers, I have a question regarding a fluid dynamic problem which I have sketched out. The initial fluid velocity is 1.5 m/s at 1.5 bar and the fluid is water. The pipe line has a ...
Dfhaa_DK's user avatar
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Calculate surface area of batch reactor

I have calculated the volume of reactor for 30000 tpa product also its diameter and height and its volume is 86 kL. How to calculate the surface area of the same reactor to check requirement of heat? ...
SHUBANGI H's user avatar
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1 answer
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How to determine the effect of manufacturing variability on assembly of items

Any help is appreciated. Below are some details The product has around 20 different components (including ones manufactured to spec, fasteners, off the shelf, consumables, etc.) Lets assume the ...
Karthik's user avatar
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How would nanobots disassemble something on a molecular level?

I've been studying this topic for use in a story I'm working on and I've come across various videos and interviews on the topic, but they all seem mostly concerned with assembly of larger objects. I ...
Geoffrey Williams's user avatar
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1 answer
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How does an Eductor work?

Am currently learning P&ID diagrams. I came across the term ‘eductor’ and I’m trying to understand its working. Apparently, it’s different from an ejector in the sense that it draws the fluid in. ...
Damon Tyche's user avatar
1 vote
3 answers
2k views

Do I need a pressure relief/safety valve if my pump can't exceed the rated system pressure?

I am designing a resin dosing & mixing room for a production plant. This will use pneumatic diaphragm pumps to pump the resin & additives, flow meters to measure the dose, and pneumatic ball ...
Kendric Rendle-Short's user avatar
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0 answers
20 views

Pressure loss of for flushing sand filter with air

This is a cut-away view of a sand filter: For flushing the filter, water and then air is pumped/blown under the filter. I'm interested in the pressure loss: The lower bound for the required air ...
mart's user avatar
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What is exactly dead-burnt lime, and why is less reactive than quicklime?

When producing lime on a lime kiln, there exists the possibility of overburning the original limestone and producing the so-called dead-burnt lime, with a much lower reactivity than quicklime. Some ...
angelpeream's user avatar
1 vote
1 answer
102 views

How to transfer high pressure hydrogen using flexible pipes?

The task is to transfer hydrogen (high pressure gas > 400 bars) from offshore platform to land. To do so we have to use flexible pipes but for high pressure and high flow rate I'm afraid we can't ...
Aron PE's user avatar
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3 answers
78 views

How to transfer compressed gas GH2 from one tank to another at the same pressure?

The problem is to transfer all the compressed hydrogen from one tank on a ship at 400 bars to fill another tank on earth (also to fill it at 400 bars). What are the common technologies and equipment (...
Aron PE's user avatar
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How to calculate the terminal velocity of grains in a pneumatic conveyor?

Here is the main question I got from a textbook: Rice is transported by a pneumatic conveyor. The particle density is 1.4g/cm³. The major, intermediate and minor diameters are 1cm, 0.3cm and 0.4cm ...
MICHAEL UMANDE's user avatar
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1 answer
93 views

Proposing a Transfer Function from a Response Graph

I need to propose a transfer function from the following graph. The K value (or amplifier gain?) we were given is 2 and it has a step response of 2 as well. When looking at the graph though it looks ...
CluelessEng's user avatar
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1 answer
60 views

What is the gain of a purely integrating process?

Consider a system where: $ \frac{Y(s)}{U(s)}=\frac{k}{s} $. Is the gain k, or infinity? Given that to a step response, steady state is never reached, but it increases linearly with no end. Thanks!
HWIK's user avatar
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1 answer
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How to determine which variables are state or input variables in dynamic modeling?

When given a P&ID and a process flow diagram, and asked to determine which of the relevant variables to a process input variables, and which are state variables (eg.: mass flow, temperature, ...
HWIK's user avatar
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What is the difference between mathematical and process/control degrees of freedom?

Taking mathematical DOF as: $$ DOF= N_{vars}-N_{eqs} $$ How would process, or control degrees of freedom be defined as? Thanks!
HWIK's user avatar
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0 answers
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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 $...
J Faller's user avatar
1 vote
1 answer
54 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 ...
wlsa's user avatar
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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, ...
el-cheapo's user avatar
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155 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 ...
Eng101's user avatar
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0 answers
228 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 ...
Capt.Krusty's user avatar
0 votes
1 answer
484 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 ...
Giri's user avatar
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1 answer
70 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 ...
Corey's user avatar
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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 +/- ...
Samuel Pappalardo's user avatar
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1 answer
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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/...
Varun Santhikumar's user avatar
1 vote
1 answer
229 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?
Sahil Syazwan's user avatar
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0 answers
44 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" , ...
Sahil Syazwan's user avatar
0 votes
2 answers
41 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 ...
NMech's user avatar
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2 answers
465 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 ...
laureapresa's user avatar
0 votes
1 answer
131 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, ...
LSUEngineer's user avatar
1 vote
2 answers
6k 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, ...
Sahil Syazwan's user avatar
-1 votes
2 answers
25 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 ...
Statsanalyst's user avatar
-1 votes
1 answer
49 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 "...
Lone_Dingo's user avatar
1 vote
0 answers
58 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 ...
Aidan Marks's user avatar
2 votes
0 answers
125 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 ...
ZenMaster's user avatar
  • 113
-2 votes
1 answer
77 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 ...
Marshall Jay Soni's user avatar
2 votes
0 answers
25 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 ...
Adam Tidball's user avatar
1 vote
2 answers
69 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’...
Sperick's user avatar
  • 111
1 vote
2 answers
63 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 ...
ZenMaster's user avatar
  • 113
9 votes
2 answers
14k 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?
DSP_CS's user avatar
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0 votes
1 answer
302 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 ...
Luke Pretzie's user avatar
0 votes
1 answer
77 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?
Kevin Leon's user avatar
0 votes
1 answer
490 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 ...
Adam Tidball's user avatar
1 vote
1 answer
555 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 ...
ParaH2's user avatar
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