Category Archives: Uncategorized

Optimum Feed Tray Location in an NGL Fractionation Column

Written on February 1, 2018 at 12:01 am, by

A fractionator is a column equipped with trays or packing materials for separating a mixture of components into two or more products, at least one of which will have a controlled composition or vapor pressure. In crude oil or condensate systems, such a fractionator is often called a stabilizer and is an alternative to stageContinue Reading

Ideal Water Content Correlation for Sweet Natural Gas

Written on January 2, 2018 at 3:45 pm, by

The analysis of Figures 1 through 3 indicates that the for pressures up to 100 psia (690 kPa) the Raoult’s law water content deviations from real state water content are within about +4% and -4%.  The water vapor content of natural gases in equilibrium with water is commonly estimated from Figure 6.1 of Campbell book [1]Continue Reading

Optimizing Performance of Refrigeration System with Flash Tank Economizer

Written on December 2, 2017 at 3:51 pm, by

Continuing the January 2008 [1] Tip of The Month (TOTM), this tip demonstrates two methods to optimize the performance of a refrigeration system employing a flash tank economizer and two stages of compression. Specifically, we will minimize the compressor total power and condenser duty by optimizing the interstage pressure.   The details of a simpleContinue Reading

Correlations for Vapor Pressure of Crude Oil Measured by Expansion Method (VPCRx)

Written on November 3, 2017 at 3:20 pm, by

Accurate measurement and prediction of crude oil and natural gas liquid (NGL) products vapor pressure are important for safe storage and transportation, custody transfer, minimizing vaporization losses and environmental protection. Vapor pressure specifications are typically stated in Reid Vapor Pressure (RVP) or/and True Vapor Pressure (TVP). In addition to the standard procedures for their measurements,Continue Reading

Effect of CO2 on the TEG Vaporization Losses

Written on October 12, 2017 at 9:04 am, by

Continuing the December 2013 [1] Tip of The Month (TOTM), this tip investigates the effect of CO2 in the feed gas, stripping gas rate and the effect of the triethylene glycol (TEG) mass circulation ratio on the TEG vaporization loss from the regenerator and contactor columns top. By performing rigorous computer simulations of a TEG dehydration process, twoContinue Reading

Effect of Methanol on Distribution of Sulfur Compounds in NGL Fractionation Train

Written on September 1, 2017 at 1:00 am, by

In the February and May 2010 tips of the month (TOTM) we presented the distribution and concentration of sulfur compounds in an NGL Fractionation Train (NFT) using commercial simulation software [1-3].   Sulfur compounds that may be present in NGL include H2S, COS, CS2, and mercaptans (RSH). These are typically present in low concentrations andContinue Reading

Infinite Recycle Impacts on Compression Systems

Written on August 4, 2017 at 4:07 pm, by

This TOTM will discuss the phenomenon of infinite recycles and their impacts on design, troubleshooting and optimization to increase oil production simply by adjusting setpoint. As well as flaring reduction, unconventionals, identification and solutions. Question: If you have an infinite recycle of LPG in your gas processing plant, how much horsepower does your compression system need? Answer: Infinite LiquefiedContinue Reading

Estimate BETX Absorption in TEG Dehydration Process

Written on July 12, 2017 at 8:10 am, by

BETX stands for benzene, ethylbenzene, toluene, and xylene, a group of compounds that all belong to the broader category of Hazardous Air Pollutants (HAPs). Benzene and ethylbenzene are known carcinogens, and have also been shown to cause blood disorders, impact the central nervous system and the reproductive system.  Additionally, Toluene may affect the reproductive, respiratoryContinue Reading

Low Temperature Methane Gas Water Content

Written on June 2, 2017 at 9:48 am, by

In the past tips of the month (October, November, December 2007, January 2011, February, September 2014. And April 2015), we studied in detail the water phase behaviors of sweet and sour natural gases and acid gas systems. We evaluated the accuracy of different methods for estimating the water content of sweet and sour natural gasesContinue Reading

Oil Dehydration Design Error Found in Most Designs Worldwide

Written on May 1, 2017 at 9:34 am, by

This tip of the month (TOTM) discusses how to “avoid a costly design error found in most oil dehydration systems worldwide”. Are you having reverse emulsion problems? Are you having problems meeting your discharge oil in water specifications.   An area to look for immediately is the Process Flow Diagram (PFD).  Normally systems work as theyContinue Reading