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Ankur's_Chemical_Engg_Blog

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Multiple Centrifugal Pumps In Series And Parallel

Posted by ankur2061 , in Technical 14 December 2012 -

· 9,891,998 views

centrifugal, pumps, parallel and 1 more...

Multiple Centrifugal Pumps In Series And Parallel

For many young process engineers the concept of multiple centrifugal pumps in series or parallel is often confusing. Today's blog entry tries to explain the concept of centrifugal pumps in series and parallel.

First of all let us understand what it means by pumps in series and parallel.

When we say multiple pumps are in series, it means that the...

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23 Comments

Comparing Iso13709 / Api 610 With Ansi / Asme B73.1 Centrifugal Pumps

Posted by ankur2061 , in Technical 05 December 2012 -

· 72,502 views

centrifugal, pump, standards and 5 more...

Comparing Iso13709 / Api 610 With Ansi / Asme B73.1 Centrifugal Pumps

I am not a rotating machinery specialist but a process engineer. Today's blog heading probably has more relevance to a rotating machinery specialist. Nevertheless, I felt that process engineers are also entitled to know the difference between these two distinct categories of centrifugal pumps used worldwide for a majority of pumping applications...

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37 Comments

Ejector Dry Air Equivalent (Dae) Calculations

Posted by ankur2061 , in Technical 22 November 2012 -

· 19,186 views

ejector, dry, air, equivalent and 1 more...

Ejector Dry Air Equivalent (Dae) Calculations

Ejectors have been discussed a lot on "Cheresources". In fact one of the most read posts on Cheresources relates to ejectors which also provides a workbook for ejectors by Art Montemayor the administrator of "Chereources" and a mentor to many of the younger generartion of chemical engineers. The link of that post is provided...

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1 Comments

Gas Hydrate Inhibitor Injection Calculations

Posted by ankur2061 , in Technical 19 October 2012 -

· 44,887 views

gas, hydrate, inhibitor and 2 more...

Gas Hydrate Inhibitor Injection Calculations

Gas Hydrate Inhibitor Injection has been discussed previously on "Cheresources" in several posts. Besides the fact that the "Hydrate Utility" in HYSYS can calculate inhibitor injection rates, there are other methods programmable in a simple excel sheet that can be utilized to provide fairly accurate inhibitor injection rates. Equations...

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14 Comments

Associated Gas Flashing Calculations From Gas / Oil Mixtures - Vasquez-Beggs Method

Posted by ankur2061 , in Technical 05 October 2012 -

· 22,658 views

gas, flashing, flash, calculation and 5 more...

Associated Gas Flashing Calculations From Gas / Oil Mixtures - Vasquez-Beggs Method

Flashing calculations from crude oil -associated gas are mostly done using a simulation software such as HYSYS or UNISIM or any other. By flashing it is meant that a crude oil - associated gas mixture is reduced from a higher pressure to a lower pressure. An example of flashing would be to transfer an oil-gas mixture from an inlet separator to a storage...

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11 Comments

Comparing Liquid And Vapor Heat Transfer Fluid (Diphenyl:diphenyl Oxide) Systems

Posted by ankur2061 , in Technical 28 September 2012 -

· 16,640 views

heat, transfer, fluid, liquid and 3 more...

Comparing Liquid And Vapor Heat Transfer Fluid (Diphenyl:diphenyl Oxide) Systems

I started my career in commissioning and operations of polyester (PET) polycondensation plants in 1985. Technologies I got exposed to during my career as an operations engineer included ICI / Monsanto (batch polycondensation), Inventa (continuous polycondensation), Zimmer (continuous polycondensation) and DuPont /Chemtex (continuous polycondensation).

One...

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3 Comments

Affinity Laws For Centrifugal Pumps As Applicable To Variable Frequency Drives

Posted by ankur2061 , in Technical 20 September 2012 -

· 19,841 views

affinity, laws, centrifugal and 4 more...

Affinity Laws For Centrifugal Pumps As Applicable To Variable Frequency Drives

Variable Frequency Drives (VFDs) or Variable Speed Induction Motors are frequently used in many applications for flow control through centrifugal pumps. One common factor associated with VFDs used for centrifugal pumps is rapidly changing flow to meet the process requirements and power savings at turndown flow rates where an oversized motor will provide...

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6 Comments

Liquid Pipeline Surge

Posted by ankur2061 , in Technical 13 September 2012 -

· 28,759 views

liquid, pipe, line, pipeline and 1 more...

Liquid Pipeline Surge

Pipeline Surge has been a hotly debated topic on "Cheresources". During one of these discussions I had said that I would try to compile a blog entry related to pipeline surge possibly with an excel workbook. Today's blog entry discusses pipeline surge sans the excel workbook. I expect the young process engineers to develop their own...

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28 Comments

Boil-Off Gas (Bog) Calculations For Cryogenic Liquefied Natural Gas Tanks

Posted by ankur2061 , in Technical 03 September 2012 -

· 381,753 views

boil, off, gas, calculations and 4 more...

Boil-Off Gas (Bog) Calculations For Cryogenic Liquefied Natural Gas Tanks

Boil-off Gas has been discussed on "Cheresources" in several posts in the past.

Recently, I came across an article on Boil-off Gas from LNG tanks which I found to be quite interesting. Today's blog entry is related to boil-off gas calculations based on this article for cryogenic LNG storage tanks of some standard capacities such as 140,000,...

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14 Comments

Empirical Equations For Pressure Drop In Crude Oil And White Oil Pipelines

Posted by ankur2061 , in Technical 27 August 2012 -

· 20,410 views

empirical, equation, pressure and 4 more...

Empirical Equations For Pressure Drop In Crude Oil And White Oil Pipelines

Most of the experienced chemical engineers know about the Darcy-Weisbach equation for frictional pressure drop using the Darcy friction factor values from Moody's chart. The Moody chart provides the Darcy friction factor values for a given Reynold's number and a given relative roughness for conduits with a circular cross-section (circular...

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8 Comments

Heats Of Combustion Correlations

Posted by ankur2061 , in Technical 13 August 2012 -

· 20,675 views

heat, combution, correlations

Heats Of Combustion Correlations

There have been plenty of posts on Higher Heating Value (HHV) & Lower Heating Value (LHV) in the "Cheresources" forums including the difference between HHV and LHV and how it can be calculated or obtained. Online property databanks such as the NIST databook will provide you the HHV or LHV if you know which chemical or a mixture of chemicals...

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6 Comments

Fixed Water Spray Demand Calculations For Fire Protection Of Tanks / Vessels

Posted by ankur2061 , in Technical 12 July 2012 -

· 54,520 views

spray, water, fire, case, demand and 2 more...

Fixed Water Spray Demand Calculations For Fire Protection Of Tanks / Vessels

Of late I have developed quite a bit of interest in HSE engineering and specifically related to Loss Prevention protection and I have been going through a lot of literature related to Loss Prevention and specifically related to fire protection.

When we talk of fire protection, some of the most comprehensive guidelines and standards developed for fire...

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31 Comments

As-Built Piping & Instrument Diagrams

Posted by ankur2061 , in Technical 06 July 2012 -

· 36,848 views

as-built, piping, instrumentation and 1 more...

As-Built Piping & Instrument Diagrams

Not many young entrants in process engineering would be aware of this aspect of engineering and today's blog entry tries to put in perspective what "As-Builting" is all about.

Most of you are aware that during the engineering phase an important task by the process engineer is to prepare "Piping and Instrument Diagrams", in short...

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9 Comments

Shell And Tube Heat Exchanger Cost Estimation

Posted by ankur2061 , in Technical 21 June 2012 -

· 136,437 views

shell, tube, heat, exchanger and 3 more...

Shell And Tube Heat Exchanger Cost Estimation

As promised in my earlier blog entry "Cost Estimation Of Fixed Roof (Cone) Carbon Steel Storage Tanks", today's blog entry relates to cost estimation of S&T heat exchangers. The equations are empirical and the reference is the same i.e.:

"Estimate Costs of Heat Exchangers and Storage Tanks via Correlations" by Armando B....

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12 Comments

Cost Estimation Of Fixed Roof (Cone) Carbon Steel Storage Tanks

Posted by ankur2061 , in Technical 15 June 2012 -

· 42,106 views

cost, estimate, fixed, roof and 4 more...

Cost Estimation Of Fixed Roof (Cone) Carbon Steel Storage Tanks

Estimating Cost for process equipment has always been an achilles heel for process engineers including yours truly. Everytime when I was asked to provide budgetary cost for equipment mentioned in a Front End Engineering Design report I used to be red-faced because I just had no idea of how equipment was costed. Fortunately in one or two organizations where...

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6 Comments

Pressure Drop In Gas-Solid Cyclones

Posted by ankur2061 , in Technical 04 June 2012 -

· 17,485 views

pressure, drop, gas, solid and 1 more...

Pressure Drop In Gas-Solid Cyclones

Cyclone separators provide a method of removing particulate matter from gas streams at low cost and low maintenance.

In general, a cyclone consists of an upper cylindrical part referred to as the barrel and a lower conical part referred to as the cone. The gas stream enters tangentially at the top of the barrel and travels downward into the cone, forming...

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5 Comments

Refinery Tankages

Posted by ankur2061 , in Technical 10 May 2012 -

· 9,936 views

refinery, tankage, tanks

Refinery Tankages

Quite sometime back, in one of my previous organizations there was some talk into diversifying into the business of providing engineering services for petroleum refining industry. We were all very excited about it and all of the process engineers were asked to take up some background study related to a specific topic in petroleum refining.

Since the...

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4 Comments

Minimum Safe Flow For Centrifugal Pump

Posted by ankur2061 , in Technical 26 April 2012 -

· 7,714,470 views

minimum, safe, flow, centrifugal and 1 more...

Minimum Safe Flow For Centrifugal Pump

Minimum Safe Flow for pumps has been discussed on numerous occasions on "Cheresources". Many posts have discussed the line sizing, flow control and the scheme for common minimum flow piping from multiple pumps operating in parallel.

Let us discuss pump minimum flow as defined by "API STD 610 - Centrifugal Pumps for Petroleum, Petrochemical...

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31 Comments

Some Notes On Corrosion In Upstream Oil And Gas

Posted by ankur2061 , in Technical 13 April 2012 -

· 13,500 views

corrosion, upstream, oil, gas and 1 more...

Some Notes On Corrosion In Upstream Oil And Gas

Corrosion Control:
Corrosion control is required when the calculated general corrosion rate cannot be accommodated by reasonable corrosion allowances for carbon steel, as listed in the attached table. For example, if the predicted corrosion rate is 10 mils per year (mpy) for a heat exchanger shell with a 20 year design life, a corrosion allowance of...

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1 Comments

Heavy Hydrocarbon Recovery From Natural Gas

Posted by ankur2061 , in Technical 29 March 2012 -

· 17,068 views

heavy, hydrocarbon, recovery and 2 more...

Heavy Hydrocarbon Recovery From Natural Gas

I have had several questions asked by entry level process engineers and even chemical engineering students studying petroleum engineering, about the various methods employed for heavier hydrocarbons recovery from natural gas and which one is better. While mentioning that there are many older methods which are gradually being phased out and newer methods...

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8 Comments

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