Level Measurement Multiple Choice Questions

4 thoughts on “Level Measurement Multiple Choice Questions”

1. My Answer against Question 1 :

   first of all such tank with such type of liquid can be called a Blending type i.e. for example we have Gasoline tank of different Density from reformer unit ,if we want to achieve accurate level measurement using for example Level measurement type (D) and regardless the other types also can be use and whether the others can give accurate level measurement or not and even for my selection (D) ,all types can not first measure the density together with level ,only level with accuracy related to any side effect during filling the tank or evacuate using pumps .

   yes, here the level measurement can be changed from type to type,but to measure or sense the density if we have different sections(Unpredictable density ) on the assumption that we have Blending Tank as i mention above or other tanks for Kerosene also receive slop of density approach to Kerosene density and so on for Gas-Oil as well.

   So we can measure the density of the blend product by using what so called Density on line meter and can be install together with the level or away from level transmitter but on same line of O/P port of tank and can read the density for each section and we can sense where is the density change for example Gasoline of density (0.71-0.77 kg/L or 719 KG/M3 ) this means different ranges of density or maybe we have slop (mixed product ) its density approach to Gasoline density (by the way slop comes from loading arms for tankers and usually pumped from slop tanks to main tanks products if the chemist after doing chemical test on its density decide to which tank should be pump .the density meter shall have a read unit inside the control room or even outside of Exd type the operator can watch the change in density .

   Therefore and In general we do not have a level measurement tool or devise used to measure both Level and density despite the mathematical relationship between (HEIGHT -DENSITY-PRESSURE )

   So the most successful measurement for a tank have Unpredictable Density to measure its level or accurate level is to use the above even the last one but for Density we need to install what so called ON Line density meter( 4-20 mA ) Output like On line viscosity meter to viscous liquids ,what is for level should be use and what is for density also should be use there is no common equipment use 2 in 1 i.e. even if we have different section or density no level measurement can sense accurately and read the level during the change of density for each section again despite the relationship between Height /Pressure /Density on mathematical model .

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   • Thank you Mr. George Ibraheem Yokhana, for sharing your knowledge & experience with us.

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2. Mr Reddy : As a matter of fact i worked in North refineries Depot /Baiji refinery -Iraq between 1985-1989 so we have tank farm of 10 tanks each of capacity 27000 M3 for different types of white hydrocarbon product (Naphtha-Gasoline-Kerosene -Gas Oil ) (please note i put here the sequence of products according to program of pumping i.e. if u want to pump all products on same pipe line ,this means u have to start with Naphtha-Gasoline-Kerosene-Gas Oil and vise versa Gas Oil -Kerosene- Gasoline-Naphtha the reason for this is the density of each product and the section or Area between the two products normally called the slop ,which means here the product has no specific density to incline toward specific product i.e. it is not Gasoline nor Naphtha in between for this i mentioned before we can not measure the density once we have Unpredictable Density especially when u are working in Blending

   to solve and controls the major problem which is the possibility of CONTAMINATION we used ON LINE DENSITY METER to avoid any contamination especially in Receive the product from main pump house i.e. from refineries to depots or from main depots to another ,for this the on line density meter usually in receiving station installed about 500 Meter away from main entry point this is for Alarm issue if we have contaminated product in order to let the product go to slop tanks not main tanks and avoid contamination(especially if we have loading and non loading arms for Tankers and then for domestic use while in main pump house yes we need density this is also for contamination i.e. not to pump contaminated product to another depots ,so this is the benefits of using On line density meters and are better than use DP transmitter and the most famous manufacturer is Schlumburger (Solartron Brand ) for both Density and Viscosity On,line measurement for any Hydrocarbon product whether it was liquid or Gas ,of curse there are other brands of same rank

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3. Please provide justification against answers which will help to understand & clear the concept.

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