Hi
Anyone familiar with adiabatic blowdown? Currently working on gas project...

Hello

Great engineers, please I need your assistant, i am currently doing my MSC in a University in Nigeria. I need an MSC research topics in Chemical engineering. Pls

@Nwaneri

I'm aspiring to be a pipeline engineer. From my research, it seems 'Newcastle Uni.' is the best for the course.

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ibudes: TO ALL ( I NEED YOUR ADVICE)
I have been given two offer in the UK to study I do not know which to choose.Please Advice.
First Course is in Msc Offshore and Ocean Technology ( Sub-sea engineering)
Second Course is in Msc Petroleum and Gas Engineering.
I will Need all your advice

I will advise you to go for the petroleum and gas engineering because of its versatility when compared to offshore and ocean technology. I also believe that an advanced degree in pet and gas engrg can fetch u a good job in subsea engineering. It also depends on the institutions offering the course. Can we know them?
Other people are welcome to advise

lol-ade:
Hi
Anyone familiar with adiabatic blowdown? Currently working on gas project...

sowii, just seeing this- so what do you want to knw abt adiabatic blowdown

snthesis:
sowii, just seeing this- so what do you want to knw abt adiabatic blowdown

Hi,
I am working on blowdown of HP gas line, as the stream is liquid free I need to do adiabatic blowdown as well as cold temp BD. I need help with the compressor settle out conditions calculation as well as literatures.

Great Process Engineers.
Experienced Process Engineers, PLEASE, HELP ME OUT!!!

I wish to find out the prospects of working as a Process Engineer on an As-Built Documentation(field verification and reviews of P&IDs)of LNG facilities.

Please, bear in mind that I don't have the experience in Conceptual,FEED, and Detailed Design but I have an excellent experience in interpreting Process Engineering Flow Schemes (PEFS) or P&IDs and Line Diagrams as I am currently working as a contract process engineer in NLNG. Also,my past experiences(3years) before this job were not in the engineering field but I have Bachelors and Masters in Engineering.

I am currently studying materials on (Conceptual,FEED, and Detailed Design) to make up for the process design knowledge inadequacies but will like to find out if any EPC OR OPERATOR company will accept someone with ONLY Field verification experience.

Please, what else can I do to boost my chances of clinching a Process Engineer job which would involve Conceptual,FEED & Detailed Design since I do not have the basic design experience?

My current job is only field verification of Process Engineering Flow Schemes (PEFS) or P&IDs for As-Built Documentation for all the 6 Trains of NLNG.

Your advice would be appreciated.

Does anyone know about Atmospheric Dispersion Modelling?

All threads here are about looking for jobs or preparing to look for jobs.None about,research,developement and commercialisation.When will the Blackman learn and be free

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lol-ade:

Hi,
I am working on blowdown of HP gas line, as the stream is liquid free I need to do adiabatic blowdown as well as cold temp BD. I need help with the compressor settle out conditions calculation as well as literature.

i apologize for the late reply again-i use NL to relax
from what i can infer from your response- it appears you want to perform the blowdown calculations manually (correct me if i'm wrong)
so lets start from first principles-

1. why blowdown
ans(i think ) it is recommended by API 521 R.P that vessels operating at 250psig or more should have a blowdown valve with an adequately sized orifice installed to reduce the pressure to 100psig or 50% of the vessel design pressure (whichever is less) in 15mins, cos "Controlled depressurring of the vessel (hope u realize "vessel" covers piping as well ) reduces internal pressure and stress in the vessel walls", which cud lead to rupture.

2. now that we have realized the need/requirement/basis for a blowdown valve/orifice arrangement- the next question is how do we size it
-i'd recommend the following: (a) GPSA (b) API 521 etc. (i'd have to do some research on other books )

3.in regards to cold temp blowdown: we have to go back to our basis and 1st principles- temp and pressure are directly related i.e if u increase the pressure of a system u will inadvertently increase its temperature. now when you blow down it means the temp of a system will drastically be reduced (especially an adiabatic system)-the implications to ur blowndown system will ultimately affect the class of piping and fitting u apply to ur blowdown system i.e the class of piping and fittings recommended with the resultant/calculated final temp associated with the cold blowdown scenario(i believe u r aware that each piping class has its design pressure and temperature range).

4. In regards to the liquid free question?- Blowdown valves are installed on the gas outlet of pressure vessels (compressor have pressurized chambers/drums) which informs me that you are probably using a software, anyways in engineering we are allowed to make reasonable assumptions based on valid reasoning a.k.a Good engineering judgment. so please feel free to make an (reasonable/defendable) assumption based on a worst case operating scenario.

5.Compressor settle out conditions: u treat the compressor as a pressure vessel (in actual fact it is, two vessels suction and discharge bottles with a plunger/stroke arrangement- pardon my layness ) taking note to account for all piping associated with it, and then u apply the applicable equations - i recommend HYSYS Depressuring utility to run blowdown cases- and you can read thru the software literature to be more enlightened.

cheers

Good day friends..please I would need some assistance.I'm currently putting up a write up on the benefits of process system engineering studies to the niger delta region..people pls treat as urgent.Thanks

rily would lik 2 knw areas chem emgr can work in the upstream sector??

cedaraustine: rily would lik 2 knw areas chem emgr can work in the upstream sector??

you can check out the web address below to help you out. It's from Shell careers. Click on and open the degree matcher below the page.

Cheers.

http://www.shell.com/home/content/careers/students_and_graduates/is_shell_right_for_me/degree_matcher/

fenks...i dt fink i'd limit myself 2 d oil n gas industry only in view of happenings.. i'd stick wit process engr.. so i can work in any field..oil n gas..chemical firms..nd odawise...
plz comment..(advice, i mean)

Kenny_G: am in upstream oil and gas production, down south

i'm in skl....chem engr..buh i dt want 2 switch completely 2 pet. engr cos of its narrowness!
i want 2 work as a process engr buh i've always bid skeptical bout workin in the upstream sector as a process engr cos dey rarely employ..they prefer u work in d downstream sector..2 work in E&P.most tyms u nid pet.engr related exposure.so do u work in d upstream sector as a process engr..if nt hw can u help me wif ma confusion

[quote author=24Spicy]
24spicy:

hi guys, pls i need your honest advice. i hav a B.Eng and MSc in chemical engineering but presently i work in d telecom sector as a BSS engineer. i also hav a CCNP certification. am thinking of going for either a masters in network engineering or a Phd in chemical engineering. pls your honest advice will be appreciated.
___________________________________________________________________________________________
With all u "claim" to have u shld be d one gvn advices 2 others

plz i'd lik 2 knw d major difference btw chemical and process engr..tried google buh couldn't get a clear msg..plz enlighten me mor..

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kvolander: Great Process Engineers.
Experienced Process Engineers, PLEASE, HELP ME OUT!!!

I wish to find out the prospects of working as a Process Engineer on an As-Built Documentation(field verification and reviews of P&IDs)of LNG facilities.

Please, bear in mind that I don't have the experience in Conceptual,FEED, and Detailed Design but I have an excellent experience in interpreting Process Engineering Flow Schemes (PEFS) or P&IDs and Line Diagrams as I am currently working as a contract process engineer in NLNG. Also,my past experiences(3years) before this job were not in the engineering field but I have Bachelors and Masters in Engineering.

I am currently studying materials on (Conceptual,FEED, and Detailed Design) to make up for the process design knowledge inadequacies but will like to find out if any EPC OR OPERATOR company will accept someone with ONLY Field verification experience.

Please, what else can I do to boost my chances of clinching a Process Engineer job which would involve Conceptual,FEED & Detailed Design since I do not have the basic design experience?

My current job is only field verification of Process Engineering Flow Schemes (PEFS) or P&IDs for As-Built Documentation for all the 6 Trains of NLNG.

Your advice would be appreciated.

This might help
Q What documentation needs to be prepared as part of the process engineer's job?

A. Most common process engineering documents during execution of any project may be as follows:

a. Basis of Design
b. Process Flow Diagrams (PFD's)
c. Heat & Mass Balance
d. Piping & Instrument Diagrams (P&ID's) also sometimes known as Process & Instrument Diagrams
e. Equipment Process Datasheets. These include but are not limited to:

i Atmospheric Storage Tanks
ii Pressure Vessels
iii Distillation Columns
iv Heat Exchangers
v Pumps
vi Compressors
vii Filters
viii Dryers
ix Reaction Vessels (Reactors)
x Agitators
xi Package Units (e.g. Nitrogen Generation Plants, Fired Heaters/furnaces, Compressed Air plants, Steam Boiler Plants, Water Treatment Plant etc.)

f. Process Datasheets for Instruments

i Pressure Measurement Instruments
ii Temperature Measurement Instruments
iii Flow Measurement Instruments
iv Level Measurement Instruments
v Control Valves (Pressure, Temperature, Flow, Level)
vi Automatic On-Off Valves
vii Safety Valves
viii Analytical Instruments (e.g. Moisture Analyzer, pH analyzer, Viscosity Analyzer, Gas/Liquid Chromatographs, Specific Gravity analyzers, Oxygen Analyzers, Calorimeters, Gas Analyzers)

g. Process datasheets for piping equipment

i Strainers
ii Traps (Steam, Moisture)
iii Special Valves
iv Inline sampling devices
v Piping Injection Devices
vi Special pipe fittings (spray nozzles, eductor devices

h. Equipment List (major equipment)
i. Line List
j Electrical Load List
k. Operation, Control & Safeguarding Philosophy
l. Hazard & Operability Studies (HAZOP) Review and Closeout Report


Q. When can process engineering be started?


A. Process engineering can be started based on one or more of the following:

a. Process description which normally would include the process chemistry, unit or plant design capacity, major unit operations involved
b. Drawings / documents related to existing plant / unit where the scope of work involves revamp or debottlenecking
c. Concept report which gives broad outline for various process routes to be adopted for manufacturing a particular chemical(s).

Q. What are the tools required to do process engineering?

A. Well, to start with you definitely need your scientific calculator. Other than that, a wide variety of tools can be employed to go about your task of process engineering.

Listed below are a few of them:



a. Graph sheets for hand calculations and drawing sketches. Many old-timers still use A4 or letter size graph paper for doing heat and mass balance & sizing calculations for the various unit operations of the plant/unit in question.
b. Using Microsoft Excel® for tables, sketches, graphs and calculations. This is one of the most widely practiced and popular way of doing process engineering in today's world.
c. Using specialized process engineering software for generating PFD's, P&ID's, heat and mass balance calculations, pump hydraulics, equipment sizing, line sizing etc. Some of the most widely used software for doing process engineering calculations and drawings are:

i HYSYS by "AspenTech" for heat & mass balance and equipment sizing / rating
ii PIPESIM by "Schlumberger" for steady state simulation of multiphase pipeline flow
iii PIPEPHASE by "Simulation Sciences" for steady state simulation of multiphase pipeline flow
iv OLGA by "Scandpower" for steady state and transient simulation of multiphase pipeline flow
v CHEMCAD by "Chemstations" for heat and mass balance and equipment sizing / rating
vi AUTOCAD by "Autodesk" for generation of PFD's & P&ID's

Other than the above mentioned software there are numerous other software available which may be used for process design. Many clients or operating companies specify the software to be used for process design when a project is executed for them by an engineering consultant. In such cases the engineering consultant may require to purchase or lease the software for performing the engineering. Unlicensed or pirated versions of software are not acceptable to most clients and their usage is considered as unethical. All good engineering / consulting companies follow certain self-imposed codes and guidelines for preventing and discouraging unethical business practices including usage of pirated software.

cedaraustine: plz i'd lik 2 knw d major difference btw chemical and process engr..tried google buh couldn't get a clear msg..plz enlighten me mor..

This might help:

Process Engineering can also be called Chemical Engineering since it utilizes the basic chemical engineering fundamentals of:

Equilibrium
Thermodynamics
Mass and energy transfer
Material balance and energy balance
Economic balance

The process engineer utilizes Equilibrium to determine the vapor-liquid phase distribution in the various parts of a plant. He uses Thermodynamics for determining the availability of and predicting the energy and other properties of the substances he is processing, usually with a minimum amount of experimental data. He makes use of Mass and Energy Transfer extensively in his calculations of the many unit operations he performs. The Mass and Energy Balance principles are then used to develop the process specifications covering the overall plant design. The Economic Balance is utilized many times during and after completion of the design to determine the feasibility of operations, for evaluation of the design of heat exchangers and for energy recovery and the degree of distillation requirements.
One additional fundamental should be the “Judgment Balance”, since none of the other engineering disciplines make so much use of empiricism and trial and error methods. Many of process calculations are not completely rigorous, such as fractionator sizing, and judgment must be applied to the final answer.
Process engineering also makes use of most of the standard chemical engineering Unit Operations such as:

Fluid flow
Heat transfer
Distillation
Evaporation
Absorption and Adsorption
Extraction
Drying
Filtration

The process design engineer deals also with most of the Chemical Processes which involves many forms of chemical reaction, including:

Oxidation
Reduction,
Combustion
Hydrogenation and Dehydrogenation
Isomerization, Alkylation and Dealkylation
Hydrolysis, etc.

The various phases or steps in the process engineering design of a plant are as follows:

Establish the design basis
Develop schematic flow diagram
Develop mass balance
Use V/L equilibrium for phase conditions
Make recycle calculations
Make fractionation equilibrium
Develop energy balance
Determine fractionator, and extractor internal loadings and the size of the vessels.
Develop a comprehensive process flow diagram and controls.
Issue the process design to project engineering.

Basic Fundamentals of Design

Calculable
Material balance
Energy balance
Heat and mass transfer
Equilibrium
Variable
Economic
Operational
Safety
Environmental
Judgment

Design Steps

Process Concerns
Establish basis of design
Develop schematic flow
Develop mass balance
Calculate vapor/liquid (V/L) phase conditions
Calculate mass transfer devices
Develop energy balance
Calculate vessel V/L loadings
Develop process flow diagram
Equipment Definition Concerns
Establish unit hydraulics
Establish metallurgy
Define mechanical equipment
Heat exchangers
Rotating equipment
Vessels/piping
Instruments
Construct piping and instrument diagram (P&ID)
Reference use of standard specifications & drawings
Prepare cost estimate

The Typical Design Package Contents:

Basic Engineering Design Data
Process Information
Mol balance
Heat and weight balance
Process flow diagram
General equipment summaries
Project Specifications
Specific equipment specifications
Metallurgy for equipment and piping
P&I diagram
Standard specifications and drawings

Pls,I want to know if it's possible for someone dat studied industrial chemistry at b.sc level to move to chemical enigeering at m.sc level.If yes,what are the basic requirement.Sorry for derailing the topic alittle bit.

U guys are great,we all need job,soon,we all get job but lets make 2013,a year of creating job by applying the skills,pls,guys let bring up ideas on self employment on the field

I wish you all the very best in your endeavours.
I want to know what it takes to make a solid state battery. I am not a student of science but I am interested in this technology. Thank you.

please i need help with this design project

Design a plant to make 20,000 tonnes per annum of refined aniline by the hydrogenation of nitro-benzene. The total of on-stream operation time plus regeneration periods will be 7500 hours per year.

Materials available:
Nitrobenzene containing < 10 ppm thiophene.
Hydrogen of 99.5 per cent purity at a pressure of 50 psig (350 kN/m2).
Copper on silica gel catalyst.

Services available:
Steam at 200 psig (1400 kN/m2) 197oC, and 40 psig (280 kN/m2) 165oC.
Cooling water at a maximum summer temperature of 24oC.
Town’s water at 15oC.
Electricity at 440 V, three-phase 50 Hz.

Product specification:
Aniline 99.9 per cent w/w min.
Nitrobenzene 2ppm max.
Cyclohexylamine 100 ppm max.
Water 0.05 per cent w/w max.

The process
Nitrobenzene is fed to a vaporiser, where it is vaporised in a stream of hydrogen (three times stoichiometric). The Mixture is passed into a fluidized bed reactor containing copper on silica gel catalyst, operated at a pressure, above the bed, of 20 psig (140 kN/m2). The contact time, based on superficial velocity at reaction temperature and pressure and based on an unexpanded bed, is 10 seconds. Excess heat of reaction is removed to maintain the temperature at 270oC by a heat-transfer fluid passing through tubes in the catalyst bed.

The exit gases pass through porous stainless-steel candle filters before leaving the reactor. The reactor gases pass through a condenser/cooler, and the aniline and water are condensed. The excess hydrogen is recycled, except for a purge to maintain the impurity level in the hydrogen to not more than 5 per cent at the reactor inlet. The crude aniline and water are let down to atmospheric pressure and separated in a liquid/liquid separator, and the crude aniline containing 0.4 per cent unreacted nitrobenzene and 0.1 per cent cyclo-hexylamine as well as water, is distilled to give refined aniline. Two stills are used, the first removing water and lower boiling material, and the second removing the higher boiling material (nitrobenzene) as a mixture with aniline. The vapour from the first column is condensed, and the liquid phases separated to give an aqueous phase and an organic phase. A purge is taken from the organic stream to remove the cyclo-hexylamine from the system, and the remainder of the organic stream recycled. The cyclo-hexylamine content of the purge is held to not greater than 3 per cent to avoid difficulty in phase separation. In the second column, 8 per cent of the feed is withdrawn as bottoms product. The purge and the higher boiling mixture are processed away from the plant, and the recovered aniline returned to the crude aniline storage tank. The aniline recovery efficiency in the purge unit is 87.5 per cent, and a continuous stream of high-purity aniline may be assumed. The aqueous streams from the separators (amine-water) are combined and steam stripped to recover the aniline, the stripped water, containing not more than 30 ppm aniline or 20 ppm cyclo-hexylamine, being discharged to drain. Regeneration of the catalyst is accomplished in place using air at 250 350oC to burn off organic deposits. Regeneration takes 24 hours, including purging periods. The overall yield of aniline is 98 per cent theory from nitrobenzene, i.e. from 100 mols of nitrobenzene delivered to the plant, 98 mols of aniline passes to final product storage.

Scope of design work required
1. Prepare a process route evaluation with a view of selecting an optimum process route.
2. Prepare a block diagram of the process plant
3. Prepare a material balance on an hourly basis for the complete process in weight units.
4. Prepare a heat balance for the reactor system, comprising vaporiser, reactor and condenser/cooler.
5. Draw a process flow diagram for the plant. This should show all items of equipment approximately to scale and at the correct elevation. The catalyst regeneration equipment should be shown.
6. Prepare a full mechanical design for the reactor. Make a dimensioned sketch suitable for submission to a drawing office, which should include details of the distributor, and show how the heat transfer surfaces will be arranged. An indication of the method of supporting the candle filters should be shown, but do not design this in detail.
7. Prepare an equipment schedule detailing all major items of equipment, including tanks and pumps. A specimen pipeline sizing calculation for the reactor inlet pipe should be given. All materials of construction should be specified.
9. Prepare the Economy Evaluation of the Process plant and determine the Pay Back time of the plant.
10. Describe briefly how the plant would be started up and shut down, and discuss safety aspects of operation.
11. Write a short discussion, dealing particularly with the less firmly based aspects of the design, and indicating the semi-technical work which is desirable.

Chemical engineering design of the following:
(a) Vaporiser
Give the detailed chemical engineering design, and give reasons for using the type chosen. Specify the method of control.
(b) Reactor
Give the detailed chemical engineering design for the fluidized bed and heat transfer surfaces. Select a suitable heat transfer fluid and give reasons for your selection. Do not attempt to specify the filters or to design the condenser/cooler in detail.
(c) Crude aniline separator
Specify the diameter, height and weir dimensions and sketch the method of
interface level control which is proposed.
(d) Amine water stripper
Give the detailed chemical engineering design of the column.
Thanks.
phinga.

^^^^
I'm almost definite you lifted this from Richardson and Coulson and this is your 500L process design project.
What exactly do you want - a guide on how to go about it or a detailed design?
I'm sure that the a detailed design of this project, or a similar project can be found on the internet. Believe me, somebody has done this before and posted it on the net. Take your time to google well. You will find it.
You may use Excel for your material and energy balance after working it out on paper. HYSYS may be useful in drawing a PFD, though not compulsory.

x-fire:
^^^^
I'm almost definite you lifted this from Richardson and Coulson and this is your 500L process design project.
What exactly do you want - a guide on how to go about it or a detailed design?
I'm sure that the a detailed design of this project, or a similar project can be found on the internet. Believe me, somebody has done this before and posted it on the net. Take your time to google well. You will find it.
You may use Excel for your material and energy balance after working it out on paper. HYSYS may be useful in drawing a PFD, though not compulsory.

It's an assgmt I really need a guid or links where I can get one

This is such a wonderful forum. The questions, the answers, the ideas sheared, and so on. I am impressed. Respect to all these gurus in the house. I just have to be a part this house, lots to learn. I have OND and BEng in chem eng, currently on NYSC. Pls senior men in the house, i, & other boys like me are under your academic care.

Hi house,i am a graduate of chemical engineering. Completed my national service two years ago. I did my i.t in a servicing firm buh due to inability to secure a job,i veered into teaching science subjects like chemistry to make ends meet. I intend to travel out to finland for my masters. How possible is it to secure a job in our field out there and what are the prospects like??

lol-ade:
Thanks Debosky/Kenny. My PM is not too keen on amine as is the client mainly because of the huge capital cost. I am looking at the membrane options especially one that can remove mecarptans as well.once again thanks guys

Its kul being here becos i just applid for chem engr @ futy dis yr 2013