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Ankur's_Chemical_Engg_Blog



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Heat Transfer In Buried Liquid Pipelines

Posted by ankur2061 , in Technical 14 December 2015 - * * * * * · 24,495 views
heat, transfer, buried, liquid and 2 more...
Heat Transfer In Buried Liquid Pipelines Dear All,

Today's blog entry relates to heat transfer from liquids flowing in long-distance buried pipelines. When liquids have to be transported at relatively high temperatures, e.g. viscous crudes/products, temperatures and cooling rates can be determined using the following formulae:



where:
TL = average temperature in cross-section of pipeline at...



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4 Comments

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Deoiling Hydrocyclones And Their Performance Prediction

Posted by ankur2061 , in Technical 12 November 2015 - * * * * * · 17,063 views
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Deoiling Hydrocyclones And Their Performance Prediction Dear All,

Today's blog entry relates to liquid-liquid hydrocyclones used in produced water treatment in the oil & gas industry.

The static hydrocyclone has rapidly been accepted as a compact and efficient means of removing dispersed hydrocarbons from water. The basic design of the static hydrocyclone is illustrated schematically in the figure below:...



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Generalized Equation For Crude Oil Working Storage In Refinery Based On Various Factors

Posted by ankur2061 , in Technical 11 October 2015 - * * * * * · 9,080 views
crude, oil, working, storage and 1 more...
Generalized Equation For Crude Oil Working Storage In Refinery Based On Various Factors Dear All,

Refinery storage of raw materials (mainly crude oil) and finished products is a complex study and involves concepts of linear programming and Monte Carlo simulation. Refer the links below to know about these in context of raw material and product storage:

http://egon.cheme.cm...mannWassick.pdf

http://informs-si...



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Distance Between Mist Eliminator Top And Vapor Outlet Nozzle For Vertical Separators

Posted by ankur2061 , in Technical 04 September 2015 - - - - - - · 14,112 views
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Dear All,

Besides defining the Low-Low (LLL), Low (LL), Normal (NLL), High (HLL) and High-High (HHLL) liquid level based on criteria such as retention time, surge requirements for normal process control and adequate disengagement space during events such as large liquid slugs entering the separator or foaming, it is also important to define the vapor out...



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Pressure Drop In Fixed (Single Phase Tubular Packed) Bed Reactors

Posted by ankur2061 , in Technical, Uncategorized 29 July 2015 - * * * * * · 18,063 views
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Pressure Drop In Fixed (Single Phase Tubular Packed) Bed Reactors Dear All,

Today's blog entry relates to pressure drop in fixed bed reactors.

Let us examine the components that contribute to the calculated pressure drop in fixed bed reactors. The design pressure drop should consider a safety margin on the calculated pressure drop.

Bed Pressure Drop : For both gases and liquids this should be calculated based on the...



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Zeolite Based Molecular Sieve Adsorbents In The Chemical Process Industry

Posted by ankur2061 , in Technical 19 June 2015 - * * * * * · 12,863 views
zeolite, molecular, mol, sieve and 1 more...
Zeolite Based Molecular Sieve Adsorbents In The Chemical Process Industry Dear All,

Today's blog entry gives a brief overview of zeolite-based molecular sieves for physical adorption operations in the chemical process industry.

Since the 1960s, molecular sieve adsorbents have become firmly established as a means of performing difficult separations, including gases from gases, liquids from liquids and solutes from solutions. T...



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Skid Mounted Modular Mini Crude Refining Units

Posted by ankur2061 , in Technical 28 May 2015 - - - - - - · 11,780 views
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Skid Mounted Modular Mini Crude Refining Units Dear All,

In remote crude oil drilling locations or where some value addition on the crude is required such as production of low cetane diesel (generally less than 40) and straight run naphtha with low first investment costs, skid mounted modular mini refining crude units are the answer.

Let us examine the advantages of a skid mounted modular unit:

1....



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Overall Heat Transfer Coefficient For Tank Heaters (Steam) Heating Hfo / Asphalt

Posted by ankur2061 , in Technical 29 April 2015 - * * * * * · 15,596 views
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Overall Heat Transfer Coefficient For Tank Heaters (Steam) Heating Hfo / Asphalt Dear All,

Today's blog entry provides an equation for Overall Heat Transfer Coefficient for storage tanks handling Heavy Fuel Oil (HFO) / Asphalt and provided with tank heating coils using steam as a heating medium.

If the heat loss rate Q (W or Btu/hr), from the tank is known, then the steam coil surface area can be calculated and thus the coil geometr...



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Requirement Of Adequate Ventilation In Process Areas

Posted by ankur2061 , in Technical 18 February 2015 - - - - - - · 16,084 views
ventilation, process
Requirement Of Adequate Ventilation In Process Areas Dear All,

Process Engineers normally are not directly involved in Heating, Ventilation, Airconditioning (HVAC) requirements of a Chemical Process Plant. HVAC engineering is a specialized branch of engineering and HVAC engineers normally involve themselves in system design for a chemical process plant. However, adequate ventilation is a matter of concern...



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Guidance Notes On Buried Piping

Posted by ankur2061 , in Technical 15 December 2014 - * * * * * · 13,978 views
buried, pipes, guidance
Guidance Notes On Buried Piping Dear All,

Most process engineers should try to understand basic concepts of piping installation along with routine process design calculations related to piping such as pressure drop, velocity and erosion / corrosion limits for various pipe metallurgies.

Today's blog entry provides some guidance on buried or underground pipe installation.

Piping should...



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Determining Diesel Transfer Pump Capacity For Diesel Engines And Generators

Posted by ankur2061 , in Technical 08 November 2014 - - - - - - · 11,162 views
diesel, transfer, pump, capacity and 1 more...
Determining Diesel Transfer Pump Capacity For Diesel Engines And Generators Dear All,

Often process engineers are asked to design a diesel storage and transfer system for diesel engines and diesel power generators. Where to start is often a question among process engineers. There has to be a design basis for designing such a system. Today's blog entry addresses the design basis for design of a diesel storage and transfer system...



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Selection And Sizing Of Marine Loading Arms For Petroleum (Black / White Oil) Products

Posted by ankur2061 , in Technical 04 October 2014 - - - - - - · 24,517 views
sizing, selection, marine and 2 more...
Selection And Sizing Of Marine Loading Arms For Petroleum (Black / White Oil) Products Dear All,

Todya's blog entry provides a procedure for selection / sizing of marine loading arms

Vessel / Tanker Design Discharge Capacity (Figure 1)



Oil Tanker Manifold Diameters



Loading Arm size should not be larger than a maximum of two sizes of the the ships manifold diameter. A smaller size loading arm compared to the ship's manifold diam...



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Flare Dispersion Analysis - Frequently Asked Questions (Faqs)

Posted by ankur2061 , in Technical 08 September 2014 - * * * * * · 20,774 views
flare, dispersion, questions
Flare Dispersion Analysis - Frequently Asked Questions (Faqs) Q1. What is Flare Dispersion Analysis?
A1. Flare dispersion analysis is a study of the dispersion of toxic and / or flammable pollutants (primarily gaseous) from a flare, either a ground or elevated flare.

Q2. Is it necessary to perform a flare dispersion analysis?
A2. Yes, it has now become mandatory in most parts of the world when a new industrial u...



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Some Guidelines For Fixed Bed Ion Exchange Units And Forced Draft Degasifiers

Posted by ankur2061 , in Technical 11 August 2014 - - - - - - · 8,135 views
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Some Guidelines For Fixed Bed Ion Exchange Units And Forced Draft Degasifiers Dear All,

Boiler feedwater is often obtained from raw water by ion-exchange process utilizing vertical cylindrical vessels which contain ion-exchange resins of various types. These resins remove dissolved salts from the water and replace them with Hydrogen (H+ ) and hydroxyl (OH- ) thus producing pure, mineral free boiler feed quality water.

Resins whic...



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Dielectric Constant Data Required For Guided Wave Radar Type Level Transmitters

Posted by ankur2061 , in Technical 22 July 2014 - * * * * * · 19,311 views
dielectric, data, guided, wave and 4 more...
Dielectric Constant Data Required For Guided Wave Radar Type Level Transmitters Dear All,

One of the most important data required for specifying guided wave radar level transmitters for storage tanks is the Dielectric constant of the stored liquid in the tank.

This data is provided by process engineers. A lot of this data is available directly form various open sources form the internet. Some links are provided below:

http://www.e...



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9 Comments

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Rotary Screw Compressors - Discussion And Calculations

Posted by ankur2061 , in Technical 03 July 2014 - * * * * - · 22,870 views
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Rotary Screw Compressors - Discussion And Calculations Dear All,
Rotary Screw compressors are fast replacing piston type reciprocating compressors all over the world. With advancement in technology of precision machining the helical screws required in screw compressors, they are becoming the first choice for selection where otherwise a piston reciprocating compressor would have been used in earlier days....



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Gas Boot Sizing Upstream Of Fwko Tanks

Posted by ankur2061 , in Technical 28 April 2014 - * * * * * · 26,564 views
gas, boot, upstream, fwko, tanks
Gas Boots are provided upstream of a Crude Oil Dehydration tank in order to degass the crude oil before it enters the dehydration tank. Entrained gas in crude oil disturbs the settling process in a dehydration tank and it's removal is required to ensure quick and effective settling for separating bulk water in crude oil dehydration tanks also referred com...



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16 Comments

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An Introduction To Corrosion Inhibitors

Posted by ankur2061 , in Technical 04 March 2014 - * * * - - · 13,149 views
corrosion, inhibitors
An Introduction To Corrosion Inhibitors Dear All,
 
There have been quite a few threads devoted to injection of corrosion inhibiting chemicals on "Cheresources". Today's blog entry makes an attempt to give some introductory knowledge related to "Corrosion Inhibitors".
 
The following paragraphs provide the details. The reference for the content of this blog article is provided at the...



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Uklpg (British) Code Of Practice For Safety In Bulk Lpg Storage

Posted by ankur2061 , in Technical 04 February 2014 - - - - - - · 15,913 views
lpg, british, safety, storage
Dear All,
 
LPG storage and the related safety considerations have been discussed many times on various threads on 'Cheresources'. Any reader / member of 'Cheresources' can find these threads using the search facility on 'Cheresources'.
 
Today's blog entry presents the British perspective on safety related to bulk LPG storage. The reference for...



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Design Equations For Venturi Scrubbers

Posted by ankur2061 , in Technical 26 January 2014 - * * * * * · 1,276,968 views
design, venturi, scrubbers
Design Equations For Venturi Scrubbers Dear All,
 
Many of you involved in engineering and design of wet scrubbing systems are already familiar with “Venturi Scrubbers”.
 
Venturi Scrubbers are primarily designed to control fine particulate matter (PM) from gaseous streams. Before releasing waste gases that contain PM to the atmosphere, these gases are treated using ventu...



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