Wednesday, August 27, 2014

GATE 2015 Chemical Engineering

Gear up for the next biggest challenge in your career, GATE-2015 online application starts from September 1st 2015. GATE (Graduate Aptitude Test in Engineering) is a common way to enter into masters, doctorial programs and public sector undertaking (PSU) companies. This time IIT Kanpur is organizing GATE-2015.

GATE-2015 Chemical Engineering (CH)

GATE 2015 chemical engineering by
It is better to start the preparation 3 to 4 months before the commencement of exam. Practice is the mantra. The more you practice the more you will be benefited. It will be useful to solve the numerical questions. The easiest way to gain more marks is to concentrate on Aptitude, English, and Mathematics. From technical side Process calculations, Chemical technology subjects are easy to gain more marks. Fluid mechanics, Process economics, thermodynamics are easier to solve next. Chemical kinetics, Heat and mass transfer subjects come in next place. The order should be decided by you ultimately based on your preparation. Follow to get updates on GATE-2015 and other Chemical engineering related stuff.

#Chemieering recommends the following books for GATE-2015 preparation in Chemical engineering stream.

GATE-2015 Highlights

  • GATE-2015 application fees is Rs 1500/- for male candidates in General/OBC category and Rs 750/- for female candidates. For SC, ST, PwD candidates the fees is Rs 750/-.
  • Payments have to be made through debit/ATM cards, credit cards or internet banking and e-challan only
  •  All Supporting documents should be sent online only. No hard copy will be accepted
  • Examinations for all the 22 papers will be conducted by an ONLINE Computer Based Test (CBT). The online examination paper will contain some questions for which numerical answers must be keyed in by the candidate using the virtual keypad. Rest of the questions shall be of Multiple Choice Question (MCQ) type.
  • GATE 2015 examinations will be held during forenoon and afternoon sessions on alternate weekends (Saturday and Sunday) between 31st January 2015 and 14th February 2015. Examination for some of the papers in GATE 2015 will be held in multiple sessions. Exact details regarding complete examination schedule will be notified at a later date.
  • The payment of application fees would be online through different modes like net banking, debit/credit card, e-challan, etc.
  • GATE 2015 score is valid for THREE YEARS from the date of announcement of the results.
  • During the online GATE 2015 examination, all candidates will be provided with an online scientific calculator which has to be used to answer the questions.

Tuesday, August 19, 2014

Types of Chemical engineering drawings - BFD, PFD, P&ID

The terms flow sheet and flow diagrams are often used in engineering and design applications. But this is not the accurate way to describe the process drawings. This post will give a glimpse about the types of process drawings.

Basically there are three types of process diagrams in chemical engineering context.

  1. BFD      - Block Flow Diagrams.
  2. PFD      - Process Flow Diagrams.
  3. P&ID    - Piping and Instrumentation Diagrams.
In a brief BFD represents entire process in a single sheet, where as in PFD you can find some detailed information like plant operating conditions, process flow. It uses symbols to represent the equipment. P&IDs provide detail information when compared to above two drawings. They use standard nomenclature, symbols, and tag numbers to fully describe the process.
These drawings are very useful as they convey the right amount of process information as needed during various stages of bidding, engineering design, procurement, construction, operating & decommissioning phases of the process.

BFD-Block Flow Diagram

Block Flow diagram by

A BFD has the ability to represent the complete process on a little more than a single sheet. It contains mainly text enclosed by boxes, interconnecting lines with flow arrows. In some BFDs mass flow rates may be mentioned so as to describe the material balance over the entire plant.

PFD-Process Flow Diagram

Process Flow diagram by

PFDs contain more information than the block flow diagrams from which they are derived. They show more detail about major equipment, subsystems and the flow of product between them. A typical PFD contains equipment symbols connected by process lines where temperature and pressure information are shown on the line itself. You can easily refer the properties of a particular stream through stream number. For designing a P&ID, equipment layout PFD is mandatory.

P&ID-Piping and Instrumentation Diagram

Piping and instrumentation diagram by

P&IDs carry a lot of information to define the process. Derived from PFD it is the best way of accurately documenting the operation of a process. P&ID takes the conceptual aspects of PFD and expand them by adding

1.      Detailed symbols.
2.      Detailed equipment information.
3.      Equipment order and process sequence.
4.      Process and utility piping.
5.      Process flow direction.
6.      Major and minor bypass lines.
7.      Line numbers, Pipe spec, Pipe size.
8.      Isolation and shut off valves.
9.      Instrumentation controls.
10.  Types of process component connections. 

A P&ID can be best understood with the help of a legend sheet given by the P&ID developer. Legend sheet contains information regarding the nomenclature, tag philosophy, symbols, a lot more. Download the PDF files to know more about drawings and legend sheet.

For detail information on BFD, PFD and P&IDs download the following PDF files.