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Interview QnA#10 When to use gear pumps?
QnA#10 When to use gear pumps?
When we need to handle high viscous liquids we need gear pumps as they deliver a higher discharge pressure (even up to 200bars) than centrifugal pumps. They are used to pump paints, resins, adhesives, pitch. diesel, crude oil etc. They are positive displacement pumps.
When we need to handle high viscous liquids we need gear pumps as they deliver a higher discharge pressure (even up to 200bars) than centrifugal pumps. They are used to pump paints, resins, adhesives, pitch. diesel, crude oil etc. They are positive displacement pumps.
Interview QnA#9 When we need pumps in parallel and pumps in series?
QnA#9 When we need pumps in parallel and pumps in series?
If we need a higher discharge flow (Q) we have to go for pumps in parallel arrangement.
If we need a higher head (H) we need to go for pumps in series. For more details
If we need a higher discharge flow (Q) we have to go for pumps in parallel arrangement.
If we need a higher head (H) we need to go for pumps in series. For more details
Interview QnA#8 Why steam enters top side of jacket in reactor?
Why steam enters top side of jacket in reactor?
If we pass the steam from bottom side the condensate that is formed after losing the heat won’t have a comfortable passage to get out of the system. In turn the entering steam will start to heat the returning condensate rather than heating the reactor surface.
That’s why we have to pass it from the top.
If we pass the steam from bottom side the condensate that is formed after losing the heat won’t have a comfortable passage to get out of the system. In turn the entering steam will start to heat the returning condensate rather than heating the reactor surface.
That’s why we have to pass it from the top.
Friday, June 8, 2018
Interview QnA#7 Why the hot liquid or cool liquid in heat exchanger, reactor jacket should flow from bottom to top?
QnA#7 Why the hot liquid or cool liquid in heat exchanger, reactor jacket should flow from bottom to top?
Answer
If we pass the liquid from top to bottom, it will flow fast by gravity itself. So it will have less contact time with the heat exchanger or reactor surface which will result in poor heat transfer.
That’s why the hot or cool fluid should be passed from bottom to top to maximize the contact time. The same is applicable for cold fluid also in reactors
Interview QnA#6 What is the difference between vapor and gas?
Interview QnA#6 What is the difference between vapor and gas?
A vapor is formed by heating any liquid and it can be condensed at atmospheric conditions either by reducing temperature or be increasing pressure. But a gas has already above the critical temperature and can’t be condensed by application of above methods.
First it has to be brought below critical temperature. Then only it can be condensed.
A vapor is formed by heating any liquid and it can be condensed at atmospheric conditions either by reducing temperature or be increasing pressure. But a gas has already above the critical temperature and can’t be condensed by application of above methods.
First it has to be brought below critical temperature. Then only it can be condensed.
Interview QnA#5 How we can find leakage in any tube in shell and tube HE?
QnA#5 How we can find leakage in any tube in shell and tube HE?
Answer
We have to remove the bonnets of left and right side of the HE. We have to force a liquid thro’ the shell side with high pressure. It will penetrate the leaked tube and come out via the same tube. Thus we can find the leakage.
Answer
We have to remove the bonnets of left and right side of the HE. We have to force a liquid thro’ the shell side with high pressure. It will penetrate the leaked tube and come out via the same tube. Thus we can find the leakage.
Interview QnA#4 What should be the pressure to be taken for pipe and reactor before put in service?
QnA#4 What should be the pressure to be taken for pipe and reactor before put in service?
Answer
For pipes the test pressure should be double the proposed application pressure and for reactors test pressure should be 1.5 times then reaction pressure.
It means if we wish to subject a pipe to 10 bar we have to do pressure testing at 20 bars whereas for the reactor it would be 15 bars.
Answer
For pipes the test pressure should be double the proposed application pressure and for reactors test pressure should be 1.5 times then reaction pressure.
It means if we wish to subject a pipe to 10 bar we have to do pressure testing at 20 bars whereas for the reactor it would be 15 bars.
Thursday, June 7, 2018
Interview QnA#3
When to use double pipe heat exchanger and shell and tube heat exchanger?
Answer
Double pipe heat exchangers are used when the heat transfer area is small say up to 14 m2. If we connect them in series to increase the heat transfer area it will require much space as well the pressure drop will be higher due to more fitings. Also we can’t increase no of passes for either side fluids.
The double pipe HE can’t be used for dirty fluids due to choking and cleaning is tougher. The advantage is it is simple to construct and easy to operate.
But in shell and tube HE, we can pack a large heat transfer area within a small volume. As the numbers of tubes are more in a shell and tube HE, we can expect a higher turbulence which will result in higher heat transfer rates. Dirty fluids also can be handled owing to
easy cleaning.
QnA#2 Heat Transfer Mechanisms or modes of heat transfer
QnA#2 Heat Transfer Mechanisms or modes of heat transfer
Answer
Conduction involves the transfer of heat by the interactions of atoms or molecules of a material through which the heat is being transferred.
Convection involves the transfer of heat by the mixing and motion of macroscopic portions of a fluid.
Radiation or radiant heat transfer, involves the transfer of heat by electromagnetic radiation that arises due to the temperature of a body.
1- Conduction
Conduction Is The Heat Transfer Between Two Substances By Direct Transferring Of Molecular Kinetic Energy . Conduction Occurs When A hot Substance Comes Into Contact With A cold Substance : Heat Is transferred From Hotter Substance Has A higher Temperature Than The Colder Substance , The Substance With A higher Temperature Has Molecules With Higher Average Kinetic Energy Than The Substance With The Lower Temperature .
heat transfer rate by conduction speed related to four factors :-
∙ Thermal conductivity of the substance
∙ The surface area over which the heat is applied
∙ The thickness of the material subject to the heat transfer
∙ The temperature difference across the materials
Fourier's Law of Conduction Q = k A ΔT/L
˙Q = rate of heat transfer (Btu/hr)
A = cross-sectional area of heat transfer (ft2)
Δx = thickness of slab (ft)
Δr = thickness of cylindrical wall (ft)
ΔT = temperature difference (°F)
k = thermal conductivity of slab (Btu/ft-hr-°F)
2- Convection
∙ Convection heat transfer involves fluids, either liquids or gases in motion
∙ convection heat transfer occurs in two parts :
o Heat transfer into or out of a fluid by the process of conduction
o The movement of the fluid transports the heated fluid, as well as its thermal energy, to another location
∙ Convection either natural or forced (using fans, pumps or other devices).
∙ Also the increased turbulent of the forced flow will increase convective heat transfer rate as a result of increased heat transfer coefficient.
Newton's Law Of Cooling ˙Q= h A ΔT
˙Q = rate of heat transfer (Btu/hr)
h = convective heat transfer coefficient (Btu/hr-ft2-°F)
A = surface area for heat transfer (ft2)
ΔT = temperature difference (°F)
3- Radiation
Is the energy emitted by matter in the form of electromagnetic waves (or photons) as a result of the changes in the electronic configurations of the atoms or molecules.
∙ Unlike conduction and convection, the transfer of energy by radiation does not require the presence of an intervening medium .
∙ All bodies at a temperature above absolute zero emit thermal radiation.
Answer
Conduction involves the transfer of heat by the interactions of atoms or molecules of a material through which the heat is being transferred.
Convection involves the transfer of heat by the mixing and motion of macroscopic portions of a fluid.
Radiation or radiant heat transfer, involves the transfer of heat by electromagnetic radiation that arises due to the temperature of a body.
1- Conduction
Conduction Is The Heat Transfer Between Two Substances By Direct Transferring Of Molecular Kinetic Energy . Conduction Occurs When A hot Substance Comes Into Contact With A cold Substance : Heat Is transferred From Hotter Substance Has A higher Temperature Than The Colder Substance , The Substance With A higher Temperature Has Molecules With Higher Average Kinetic Energy Than The Substance With The Lower Temperature .
heat transfer rate by conduction speed related to four factors :-
∙ Thermal conductivity of the substance
∙ The surface area over which the heat is applied
∙ The thickness of the material subject to the heat transfer
∙ The temperature difference across the materials
Fourier's Law of Conduction Q = k A ΔT/L
˙Q = rate of heat transfer (Btu/hr)
A = cross-sectional area of heat transfer (ft2)
Δx = thickness of slab (ft)
Δr = thickness of cylindrical wall (ft)
ΔT = temperature difference (°F)
k = thermal conductivity of slab (Btu/ft-hr-°F)
2- Convection
∙ Convection heat transfer involves fluids, either liquids or gases in motion
∙ convection heat transfer occurs in two parts :
o Heat transfer into or out of a fluid by the process of conduction
o The movement of the fluid transports the heated fluid, as well as its thermal energy, to another location
∙ Convection either natural or forced (using fans, pumps or other devices).
∙ Also the increased turbulent of the forced flow will increase convective heat transfer rate as a result of increased heat transfer coefficient.
Newton's Law Of Cooling ˙Q= h A ΔT
˙Q = rate of heat transfer (Btu/hr)
h = convective heat transfer coefficient (Btu/hr-ft2-°F)
A = surface area for heat transfer (ft2)
ΔT = temperature difference (°F)
3- Radiation
Is the energy emitted by matter in the form of electromagnetic waves (or photons) as a result of the changes in the electronic configurations of the atoms or molecules.
∙ Unlike conduction and convection, the transfer of energy by radiation does not require the presence of an intervening medium .
∙ All bodies at a temperature above absolute zero emit thermal radiation.
Centrifugal pump full course in HINDI
दोस्तों अगर आप केमिकल इंजीनियर है और प्लांट में काम करते हैं तो आपके लिए सेंट्रीफ्यूगल पंप के बारे में जानना बहुत जरूरी है
अगर आप कोई भी इंटरव्यू में जाएंगे तो आपको एक या दो क्वेश्चंस सेंट्रीफ्यूगल पंप के बारे में जरूर होंगे आज मैं आपके लिए पूरा सेंट्रीफ्यूगल कोर्स लाया हूं जो एक बार देखने पर आपके सारे कंसेप्ट इझीली क्लियर हो जाएंगे जिसका लिंक नीचे है
अगर आप कोई भी इंटरव्यू में जाएंगे तो आपको एक या दो क्वेश्चंस सेंट्रीफ्यूगल पंप के बारे में जरूर होंगे आज मैं आपके लिए पूरा सेंट्रीफ्यूगल कोर्स लाया हूं जो एक बार देखने पर आपके सारे कंसेप्ट इझीली क्लियर हो जाएंगे जिसका लिंक नीचे है
Centrifugal pump #1
Parts of pump
Plugins of pump
Theorically standard procedure for
- Start-up
- Changeover
Centrifugal pump#2
Head calculation
Power Calculation
Centrifugal pump#3
Cavitation
Types of cavitation
Impact of Cavitation
Troubleshooting of Cavitation
NPSH Calculation
Centrifugal pump#4
Affinity laws
Pump calculations
- Hydraulic power Calculation
- pump shaft power
- Electrical power required
Impeller size changing & Its impact
Pump Curves
- Flow vs head
- Flow vs efficiency
- Flow vs power
- Flow vs low static head & high static head
Factors affecting pump performance
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Wednesday, June 6, 2018
Interview QnA#1
Chemical QnA #1
What is Specific heat, Latent heat, Sensible heat ?
Answer
Specific heat
The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius
m = Mass of Substance
Cp = specific heat
ΔT = Temperature difference
= T initial - T final
Latent heat
Heat transfer can occur with no temperature change taking place this heat transfer is referred to as latent heat transfer.
Latent heat transfer results in phase change , that is a substance changes from solid to liquid , liquid to solid , liquid to gas or gas to liquid.
Sensible heat
When an object is heated, its temperature rises as heat is added. The increase in heat is called sensible heat. Similarly, when heat is removed from an object and its temperature falls, the heat removed is also called sensible heat.
Heat that causes a change in temperature in an object is called sensible heat .
Check Video for better understanding
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Lupin walkin interview 9th june Diploma chemical B. Sc M. Sc B. Pharma 1 to 6 yr exp
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Lubrizol hiring Diploma chemical & B. Sc chemistry in gujarat
Company: Lubrizol Advanced Materials India Pvt Limited
Position: Operator - Production
Qualification: *Diploma Chemical*/ BSc Chemistry
Experience: 4 Years + in Chemical industry
Location: Dahej-Gujarat
Can apply on hrsouthasia@lubrizol.com
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Position: Operator - Production
Qualification: *Diploma Chemical*/ BSc Chemistry
Experience: 4 Years + in Chemical industry
Location: Dahej-Gujarat
Can apply on hrsouthasia@lubrizol.com
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GVK bio walking for M.Sc M.pharm hyderabad 9th june
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Unichem hiring interview for BE Chemical, B.Sc, M.Sc 2 to 5 yr exp at kolhapur
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Intas pharma walkin interview B pharm M Pharm 2 to 5 yr Ahmedabad
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Tuesday, June 5, 2018
Panacea biotec hiring BE B. Tech B.Sc M.Sc For Production & QC
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Friday, June 1, 2018
Aurobindo pharma walkin interview 2nd 3rd june for production packing QC, I QA
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Why steam enters top side of jacket in reactor? If we pass the steam from bottom side the condensate that is formed after losing the heat...
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