15 replies to this topic

[betty]

I'VE PROJECT >>HOW TO ESTIMATE THE COST OF AN EQUIPMENT

FROM PERRY BOOK..
i'VE TABLE IN ATTACHMENT

BUT WHAT THE STEPS AND HOW CAN i ESTIMATE THE COST OF AN EQUIPMENT

LIKE hEAT EXCHANGER

cOULD ANY BODY HELP ME IN THIS...!!??

BEST REGARDS

Attached Files

•  cost.jpg   92.6KB   214 downloads

[kkala]

Let us have an example, e.g. there is need to estimate the capital cost of a carbon steel centrifugal pump, 200 HP. The table of Perry informs that such a pump of 100 HP (without motor) has a cost of about 4400 $ and an exponent of 0.67.
The pump of 200 HP falls withing the size range indicated in the table (40-400 HP), so you can estimate its cost at
4400x(200/100)^0.67=7000 $.
However the presented part of the table has size range 10-25 HP for motors, so you have to search elsewhere, if you want a 220-250 HP motor for the pump.

This is the information that the table can give. But note the following in addition:

Update the cost of the table to the present value using some multiplier (index), e.g. Marshall & Steven from Chemical Engineering (but there must be more precise indexes for pumps).
The estimated cost is FOB (free on board), that is loaded on ship, railway truck, etc. Estimate the transportation & insurance cost to your door.
Installation cost (base on ground, work to connect to the pipes, etc) can be as high as 2 x capital cost.

[betty]

thank you indeeed ..
your replay was very useful ..especially the example that you have written..

Thanks

[Zauberberg]

Hello Betty

All is going well in Oman? Muscat should be quite nice at this time of the year, unless there have been some rain floods that usually occur at the end of December or beginning of January.

Maybe you can use the following link and see where the figures you get from here bring you at: http://www.matche.com/
The strange thing is that this calculation engine does not take into account equipment design pressure but perhaps you can look at some of your earlier projects and see what scaling factor can be applied on values given by the Matche's website.

Alternatively, you can subscribe on Chemical Engineering and get a fresh information about CEPCI at any time: http://www.che.com/pci/ or try to obtain the book "Analysis, Synthesis and Design of Chemical Processes" by R.Turton that includes CAPCOST, a software "for evaluating fixed capital investment, full process economics, and profitability-now expanded with cost data for conveyors, crystallizers, dryers, dust collectors, filters, mixers, reactors, and screens. It also contains the HENSAD tool for constructing temperature interval, cascade, and temperature enthalpy diagrams; estimating optimal approach temperatures; and designing heat exchanger networks".

Some more information can be found at: http://people.clarks...gn/CostEstn.pdf

[Andres Valencia Michaud]

Well, actually, that data is available in the back cover of every "chemical engineering" magazine (search your library) or subscribe to it. They'll send half a year free issues and will keep sending the digital edition of the magazine (I've got a year so far). About the index values for 2004, you might try looking in Peter & Timmerhaus's book "Plant Design and Economics"

[ankur2061]

Betty,

I seem to understand that you are an Omani citizen (correct me if I am wrong) and English is not your primary language. However, you have already made several posts on the forum, so you are well aware of how others post their query. Writing in bold is considered to be impolite so next time you make a post, use lower case letters.

Since you are a chemical engineering student, you should be able to access the book:


Plant design and economics for chemical engineers
By Max Stone Peters, Klaus D. Timmerhaus, Ronald Emmett West

For any kind of preliminary costing of chemical process equipment & plant, this book gives excellent material & should be a must read for any chemical engineer or chemical engineering student who wants to understand costing & economics of the chemical process industry.

Hope this helps.

Regards,
Ankur.

[betty]

Dear Ankur,

Nice to know that you are being work in Oman- Muscat....

Yes I'm Omani...

I'm doing estimation for the cost of SRC Project (Sohar Refinery Project),,,I've the list of major equipment, But the problem is that I don't have the specification of each major equipment to do estimation ,, & imagine this plant has 7 areas and each area has 2-5 units,,, How could I manage without any info!!!

the methods of estimation that I know are dependent on the volume, area, height,pressure etc...

I'm wondering ,,Aren't there any other methods,,,

best regards

betty

[Andres Valencia Michaud]

Well, when I was a student (not so far hehehe) I liked to size projects and I figured out that to calculate the cost of a plant isn't easy. On one hand, you can always follow the book we have been telling you of. It's like a spreadsheet, by analizing the cost of the major equipment you can calculate the cost of the plant within a range of -20% to +30% offset. In other words, the only way to properlly calculate the cost of a plant is to size EVERY equipment and ask the supplier the prices. You can also do a search for used equipment since many plants are sold either by piece or complete. Just google "used chemical plants equipment" and you'll get some pages with info (which is not easy to get). There's no easy way to get the cost anyways... so if you don't have all the specs of the equipment you might end up in trouble. To give you an example, a typical pump might cost 30 to 60000 usd, but if the operation pressure is too high (for example 120 kgf/cm²) the pump might cost 10.000.000 USD or more.

[betty]

Are My estimation right!!!!??

For CDU unit in such refinery!!??

I've used this website :

http://www.matche.com

,,,,,

Plz check the attached sheet...

regards

Attached Files

•  areaa.xls   18.5KB   169 downloads

[Andres Valencia Michaud]

Are My estimation right!!!!??

For CDU unit in such refinery!!??

I've used this website :

http://www.matche.com

,,,,,

Plz check the attached sheet...

regards

I took a quick look at your spreadsheet and here are my advices:
a) 300 MMBTU/h is a LARGE power quantity. Such heat exchanger is worthy of 4.7 Million USD, but I don't think it will be made of 1 heat exchanger but of a train of heat exchangers... for example, in the plant I work for we have 4 heat exchangers (HE) in series for a total of 17 MMKCal/hr (68 MMBTU/Hr)at a cost of 2 or so million USD. (I'm not sure... I'm new at the plant). So, when sizing the plant, first make sure the capacity treated. Next time tell me how many barrels per day you are treating (20000 bpd?? 45000 bpd??)
Take a look at this: http://ns15.webmaste...surplus_cpu.htm There are some PFD's of the CDU's that are on sale so you can know how many equipments you need. TRY to search for companies like this one which sales the whole plant or the equipment by piece. They'll give you the numbers if you have time to wait for them to answer.
c) The principal equipment for you are the distillation towers and furnace with heat exchangers. If it is a vacuum CDU, the vacuum units are very important.

[betty]

hi there,,

I faced this kind of case:

like if I want to get the price raw material of a refinery but I have it in $/barrel and I want it in $/year.. Shall I multiply it by 365!!!??

Annual cost of raw material
Raw material
Crude:: 71.8 $/Barrel >>>>>>......$/year
Methanol:: 73 $/Barrel >>>>>>......$/year
Natural Gas: 0.44 $/Barrel >>>>>>......$/year
Carrier Gas : 85 $/Barrel >>>>>>......$/year
Total cost raw material 230.24 $/Barrel >>>>>>......$/year

Best Regards

Edited by betty, 04 January 2010 - 07:25 PM.

[betty]

hi there..

i am waiting..

[Zauberberg]

You need consumption of raw materials, and total crude oil processed, per year - in terms of Barrel/Year. Then simply multiply $/bl * bl/yr = $/yr

[Andres Valencia Michaud]

Actually, what you need in the first place is to know the capacity of production your plant has... tell us what's your proposed and designed capacity and I may ask someone here for the numbers of each raw material and primary and secondary products.
Your CDU is usually known as a TOPPING unit, if you need more info, just google it.

[betty]

Thank you for your replay,,,,,,


The production of plant...

plant produces (116,400 BPD from CDU + 75,260 BPD From RFCC)

Best Regrds

[riven]

For initial evaluations

Seider, Seader, Lewin: Product and Process Design Principles: Synthesis, Analysis, and Evaluation, 2nd Edition

is also useful; Chapter 17 I think is the costing chapter.