The objective of this lab is to measure and study density and specific gravity of different liquids by using hydrometer. This gives information how light or heavy a crude oil is.
1-To calculate plastic viscosity of the mud .
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The objective of this lab is to measure and study density and specific gravity of different liquids by using hydrometer. This gives information how light or heavy a crude oil is.
1-To calculate plastic viscosity of the mud .
2-To calculate yield point.
Viscometer or rheometer is a device used to measure the viscosity and yield point of mud, A sample of mud is placed in a slurry cup and rotation of a sleeve in the mud.
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2. INTRODUCTION
Accurate determination of the density or specific gravity of
petroleum and its products for the conversion of measure volumes
at the standard temperature of 15°C, 20°C or 60°C and also volume
to mass and vice versa. The hydrometer method is most suitable
method for determining the density or relative density (specific
gravity) of mobile transparent liquids. It can also be used for viscous
oils by allowing sufficient time for the hydrometer to reach
equilibrium or for opaque oils by employing a suitable meniscus
correction. Hydrometer readings are obtained at convenient
temperatures, reading of density being reduced to 15°C or 20°C.
Specific gravity is the ratio of mass of a volume of a liquid at 60°F
to the mass of an equal volume of pure water at the same
temperature, i.e. the ratio of the density of the liquid at 60°F to the
density of water at 60°F. When reporting results of specific gravity,
it is specific gravity 60° / 60°F.
The aim of this experiment
The objective of this exp. is to measure and study density and
specific gravity of different liquids by using hydrometer. Moreover,
it will provide sufficient information about light and heavy crude
oils.
3. Theory
Hydrometer: is considered the simplest and the fastest method in
determination of density and specific gravity of a liquid.
The operation of the hydrometer is based on the Archimedes
principle that a solid suspended in a fluid will be buoyed up by a
force equal to the weight of the fluid displaced. Thus, the lighter the
liquid (that is, the less its specific gravity), the deeper the body sinks
because a greater amount of liquid is required to equal the body's
weight.
A hydrometer is usually made of glass and consists of a cylindrical
stem and a bulb weighted with mercury or lead shot to make it float
upright.
The liquid to be tested is emptied into a tall container, often a
graduated cylinder. The hydrometer is gently lowered into the liquid
until it floats freely.
The point at which the surface of the liquid touches the stem of the
hydrometer is noted.
Hydrometers usually contain a scale inside the stem, so that the
specific gravity can be read directly.
4. Hydrometer
Density of a liquid: is its mass per unit volume at a given
temperature.
Specific gravity of liquid (Sp. gr.): is the ratio of density of a
substance (Liquid) compared to the density of fresh water.
5. Tools:
1- liquid (Sample)
2- Thermometer
3- Graduated cylinder (bottle)
4- Hydrometer
5- Water Bath
Experimental Procedures: GOGGLES may be required!
a) Fill the cylinder with the test liquid.
b) Read the temperature of the liquid by the thermometer T
actual
c) Down the hydrometer into the sample slowly and carefully
d) Keep the hydrometer floating in center of the cylinder and from
the wall.
e) After stabilization of the hydrometer, note the point where the
surface of the liquid touches the stem.
Discussion Section I.:
1- What is the significance of density and sp gr. test in oil industry
field?
2- Define “HYDROMETER”?
3- What are the differences between density and relative density?
6. 4- What are the differences between density and specific gravity?
5- Discuss your results and observations. You should also
write a brief summary of your work and results.
Discussion Section II. :
1- What is the significance of density and sp gr. test in oil industry
field?
2-What property of oil makes it float on water?
3- What are the differences between density and relative density?
4- What are the differences between density and specific gravity?
5- What's API gravity? Explain
References:
1.www.scribd.com
7. Name: Muhammed Fuad Rashid
Answers of Discussion section I.:
1.our main purpose is to determine the API of the crude oil for
that sake we need Specific gravity and to find out sp.gr we
have to know the density of the crude oil.
2. Hydrometer: is considered the simplest and the fastest method
in determination of density and specific gravity of a liquid.
3. Density: is its mass per unit volume at a given
temperature.
Relative density: is the ratio of density of a substance (Liquid)
compared to the density of fresh water.
4. Density: is its mass per unit volume at a given
temperature.
Specific gravity: is the ratio of density of a substance (Liquid)
compared to the density of fresh water.
5. 𝑚 = 𝜌𝑉 → (0.755 × 1000) × 0.5 = 377.5 𝑔
6. 𝜌 𝑤𝑎𝑡𝑒𝑟 = 1
𝑘𝑔
𝐿
sp.gr = 𝜌
𝑉 =
𝑚
𝜌
→
185 ÷ 1000
1.2
= 0.15416667𝐿
Answers of Discussion section II.:
1.our main purpose is to determine the API of the crude oil for
that sake we need Specific gravity and to find out sp.gr we
have to know the density of the crude oil.
2.Density
3. Density: is its mass per unit volume at a given temperature.
Relative density: is the ratio of density of a substance (Liquid)
compared to the density of fresh water.
4. Density: is its mass per unit volume at a given temperature.
Specific gravity: is the ratio of density of a substance (Liquid)
compared to the density of fresh water.
5. The American Petroleum Institute gravity or API gravity: is a measure
of how heavy or light petroleum liquid is compared to water. If its API gravity
8. is greater than 10, it is lighter and floats on water; if less than 10, it is heavier
and sinks.
Thus,
Petroleum is lighter than water and floats: API gravity > 10
Petroleum is heavier than water and sinks: API gravity < 10
6.There're too many reasons that makes error in our results such as the
person who is in charge of the testing maybe he/she is not so accurate
in taking results or the volumetric flask was not cleared well after the
determine firs sample or maybe digital balance was not working
properly or maybe we made some mistakes during the calculation.