What is Vessel: Definition and 224 Discussions

A research vessel (RV or R/V) is a ship or boat designed, modified, or equipped to carry out research at sea. Research vessels carry out a number of roles. Some of these roles can be combined into a single vessel but others require a dedicated vessel. Due to the demanding nature of the work, research vessels are often constructed around an icebreaker hull, allowing them to operate in polar waters.

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  1. D

    Mechanics - cylindrical steel pressure vessel

    mechanics -- cylindrical steel pressure vessel Homework Statement A thin-walled, closed-end, cylindrical steel pressure vessel, internal diameter 500 mm and wall-thickness 10 mm, has an internal volume 0.5 cubic metres. Find the additional volume of a compressible fluid that must be pumped in...
  2. G

    Say there is a vessel with constant volume

    Say there is a vessel with constant volume. We know the EOS, moles and Cp of the vapor in it. How can we design an experiment to measure the (dS/dP) at constant V? I think the idea is to transform (dS/dP)v into something that consists of Cp, V,P,T only. Then we can measure the small...
  3. R

    Location of Safety Valve on a Pressure vessel

    Is there a specific location (say top, bottom etc.) that a safety relieving valve is put on a pressure vessel? Say there's a tall refining separation column (operating above atmospheric pressure), where would logic (or codes) indicate that a pressure relief valve ought to be ideally placed...
  4. L

    Is the Pressure Vessel Design for a Railway Cistern Appropriate?

    Design a railway cistern for 120,000 kg of Liquid. It has to be a cylindrical shell on two supports. The cistern is 18 m long 3 m in diameter (inner). It is made of steel with the yield strength of SY= 240MPa. Safety factor of FY= 1.9; Total corrosion allowance, c= 3.0 mm; Welded joint...
  5. steves1080

    What is the boil-off rate of a saturated cryo liquid inside a vessel?

    Note: this is not a homework question; this is strictly conceptual in understanding the equations at work in this scenario. The tank is vacuum-insulated, the liquid is saturated, and the vents have just been opened in order to vent down the ullage pressure. My question is simply how do you...
  6. G

    Where Can I Find a Non-Stirred Pressure Vessel for High Temperatures?

    Hi, I was wondering if anyone knew where I could buy a pressure vessel that meets the following specifications: min. pressure: 2,000 psi max temp.: at least 800°C volume: around 80-100 mL I've been searching for around month now with little success... I could really use some help...
  7. S

    How Does Heating Affect Pressure and Temperature in a Sealed Steam Container?

    Homework Statement A rigid vessel of volume 2.5 m3 contains steam at a pressure of 6 bar and a dryness fraction of 0.75. If the contents of the vessel are heated, determine: i) the pressure at which the steam becomes dry saturated, ii) the temperature of the steam when the pressure reaches...
  8. B

    What happens to P when a vessel of water with no headspace is heated?

    Assume we have a vessel capable of withstanding infinite pressure. What happens to the pressure inside the vessel when that vessel is filled completely with water, with no air space at the top, and is then heated? Do the equations for vapor pressure still apply if there's no space for a vapor...
  9. K

    Potential Energy in a Vessel

    Hi, I have a project which I am working on which is trying to work out the Potential Energy from a Vessel filled with compressed air. I have found a few different equations for this and was wondering if anyone has any experience on this to guide me a little. To first size the receiver I...
  10. A

    Time taken by gas to fill empty vessel

    Suppoese there is a empty vessel connected to a pipeline having a continuous supply of gas at pressure P. Gas will continue to move in vessel till pressure in it become P. How to calculate time required to fill the vessel completely. Plz help.
  11. T

    Help with Thermo Problem, vaporization of water into evacuated vessel

    one mole of liquid water (100 deg C, vapor pressure = 1 atm) in a container is introduced into an evacuated vessel maintained at 100 deg C and allowed to evaporated. The volume of the vessel is such that the final pressure of the gaseous water is 0.1 atm. Given the (normal) latent heat of 9,730...
  12. Y

    Forces on an underwater vessel

    I have a question about a Fiberglass Hemisphere that is 16" in diameter and 8 " in height. It is being used as a vessel under the water so it has a closed top. I wanted to know how to figure out how much stress from water pressure it will handle before it fails. thanks!
  13. C

    Curious - question about a pressure vessel and tempreature

    I have no intention of designing, building or experimenting with this, so no worries about safety. I'm just curious and did a Google search for Physics Forums and this was the first to come up. I was wondering, when pressure decreases so does temperature, right? So, were we to have a pop...
  14. E

    Submarine pressure vessel design

    I'm working on the design for a dry-hull model submarine. My plan is to cast the hull shape that I want out of aluminum because this type of casting is cheap, easy to make, and because aluminum has a good strength to weight ratio. I want the hull to be able to withstand an external pressure of...
  15. M

    One kg of air is heated in a closed rigid vessel

    Homework Statement One kg of air is heated in a closed rigid vessel such its temperature changes from 27 C to 427 C . Find the heat transfered and change in internal energy . Assume : - R= 0.287 KJ/kg k Cv = 0786 KJ/Kg k Homework Equations Q = mXCX(T2 - T1 ) The Attempt at a...
  16. J

    Pressure Washer Pump used to pressurize pressure vessel?

    Hi, I am working on a project that requires me to pressurize water in a small pressure vessel up to a pressure of 1500 psi. I am searching for a pump to do this. Do you guys think a pressure washer pump such as this one...
  17. J

    Calculating Fill Time for Pressure Vessels: Inlet Parameters & Mass Flow Rate

    I am needing to calculate the fill time of a pressure vessel. I know the following parameters regarding the vessel: Volume, Temperature, Properties of the fluid media, inlet pipe diameter, flow rate of the inlet, pressure of the inlet. I tried calculating the mass flow rate of the inlet...
  18. R

    I need a quick-opening pressure vessel

    Hey guys I'm new here. I need to find a generic pressure vessel that can take in a gas at up to 6MPa and then have a quick release system that would allow me to very quickly depressurize/open it and remove the contents within ~10 seconds or less. Right now we use bolts to hold down the lid...
  19. T

    Why is shear stress highest at the wall of a vessel?

    Hey guys, I am trying to conceptualize as to why shear stress in a vessel is highest at the wall of the vessel and why it is at a minimum at the center. First let me see if I actually understand shear stress - In a vessel with blood flow, it is the force required to overcome the...
  20. G

    Understanding Pressure Distribution in a Rotating Vessel of Water

    A closed vessel full of water is rotating with constant angular velocity \Omega about a horizontal axis. Show that the surfaces of equal pressure are circular cylinders whose common axis is at a height g/{\Omega}^2 above the axis of rotation. Any ideas? I do not know how to start.
  21. P

    Functioning of earthen vessel.

    When temperature of water in earthen pot is less than temperature outside, will earthen vessel help in maintaining the temperature of water inside constant (or) will it help by decreasing the temperature inside?
  22. N

    Calculating Pressure Vessel Thickness with Given Data

    Homework Statement Problem: find the thickness of a Pressure Vessel. Given: Operating Pressure, Operating Temperature, Material type and Grade, and OUTSIDE Diameter/Radius Homework Equations q1. how to calculate Design Pressure/Temp. from Operating Pressure/Temp.? q2. how to calculate...
  23. C

    Spectrum observed on heated vessel

    Today i was heating a bowl of soup..the intensity of the flame of the gas stove was quite high.. i observed that the bowl got burnt and when it cooled down a bit, i observed a band of colours..blue was the most prominent..i noticed the presence of violet, yellow and orange too.. I wish to know...
  24. Z

    Leak in vacuum vessel question

    Question: How can I estimate the amount of air that leakes into a vacuum vessel. I know the pressure outside the vessel (1020 mBar), the pressure achieved in the vessel (10 mBar), the pumping speed of the vacuum pump (400 cubic metres per hour) and the duration of the leaking (6 hours). Volume...
  25. G

    Calculate thickness of a pressurized vessel

    Hi guys. I am trying to figure out how thick should be an aluminium pressurized vessel with a internal pressure of 0.125 pa or 1/8 bar. The shape of the box is a cylinder 130cm base x 170cm height. The maximum pressure difference is 0.125 bar inside -> 0 bar outside. I know that i need to know...
  26. R

    Thermo problem for a pressure vessel

    Homework Statement My question has to do with heating water to a superheated state inside a constant volume vessel. Given: A pressure vessel with a total volume of 36.77ft^3, is filled with 5 gal of water and heated from room temp. to a final temp. of 1100°F. Obvisouly the initial pressure...
  27. R

    Thermo problem for a pressure vessel

    My question has to do with heating water to a superheated state inside a constant volume vessel. Given: A pressure vessel with a total volume of 36.77ft^3, is filled with 5 gal of water and heated from room temp. to a final temp. of 1100°F. Obvisouly the initial pressure is atmospheric and...
  28. E

    Lowest surface to volume ratio for an uncovered vessel

    Hi, It is well known that a sphere has the lowest surface to volume ratio. However, a related question is: What is the shape that gives the lowest surface to volume ratio if you do not include the "top" in the surface. That is, what is the maximal volume of an uncovered vessel of a fixed...
  29. J

    Year 12: Cambridge Physics Problem (Pressure inside a vessel)

    A vessel is divided into two parts of equal volume by a partition in which there is a very small hole. Initially, each part contains gas at 300K and a low pressure, p. One part of the vessel is now heated to 600K while the other is maintained at 300K. If a steady state is established when the...
  30. T

    Time to pressurize a vessel of fixed volume

    Hi, I'm looking for a method to calculate how much time it will take to pressurize a vessel from 1 atm to 60 psig after a flow control valve is opened. The method I was considering using is: I was thinking about using PV=nRT and (P1*V1)/T1=(P2*V2)/T2 to determine the # of moles in the...
  31. H

    Accounting for Compressive Forces in Thin Wall Pressure Vessels

    Description is in the image as well as the question. I was wondering for a) do i need to take into account the compressive forces that is acting on the vessel? Cheers
  32. F

    Using accelerometer to detect moving/stationary at sea on a vessel

    Hi, Does anyone has experience using accelerometer on a ship/vessel to detect whether the vessel is moving or stationary? The difficult part is that I took some samples at 6Hz and found that all X/Y/Z axes have accelerations going positive and negative. The pattern is exactly the same...
  33. S

    Thin walled pressure vessel with external force

    Homework Statement Homework Equations σ=pr/t (hoop) σ=pr/2t (longitudinal) τ=VQ/It The Attempt at a Solution I have longitudinal stress and hoop stress. I'm trying to find shear stress, which should come only as a result of the 40kN from the collar correct? I'm confused...
  34. I

    The amount of force on one trapezoidal side of a water vessel

    I need help understanding certain aspects of this problem... Problem statement Write an integral expressing the amoutn of force on one trapezoidal side of this water vessel when the height of the water is H meters. The density of water is 1000 kg/m3, and the force of gravity is 9.8 N/kg...
  35. N

    Design Vacuum Vessel for Training Stand

    Hello, This is my first post, so I believe, that you understand and help for me. So I have a task to design vacuum vessel, precisely, my task names "Training stand to measure the height of the flight fuel pump". Height will be simulated by vacuum in fuel tank, which will create a vacuum pump...
  36. J

    What's the Best Term for Damaged Nuclear Fuel Handling?

    Hello everyone! Anybody deals with nuclear waste? I got a question about the maintenance vessel Lepse, which is fully loaded with radwaste. Here is a link: http://www.bellona.org/english_import_area/about_bellona/33320 There are many cases (or tubes) containing one spent fuel assembly...
  37. G

    Air pressure vessel safety valve size

    Hi everyone, I have to determine the size of safety valve for an air pressure vessel. I found in ASME and BS 5500 a procedure to calculate the size of safety valve, which relates the mass flow capacity to the: pressure, temprature, discharge area, s.v coefficient, and air parameters. This can...
  38. C

    Pressure vessel in a (near) vacuum

    I don't know if its daylight savings or what, but I just can't seem to wrap my head around this analysis. There is a polycarbonate hemispherical head with 8 psi in a near vacuum environment (2.8 torr) Im trying to figure out what the minimum thickness is for the head. The shell is super...
  39. R

    Linear Blood Vessel Network Examples in Animals or Plants

    The pattern could be at an arterial, arteriole or capillary level. There are plenty of examples of branched patterns in organisms. (C) Baccar et al, Difficulté du diagnostic étiologique d’un poumon clair unilatéral, La tunisie Medicale - 2011 ; Vol 89 ( n°06 ) : 578-579 But are there...
  40. I

    Finding Equilibrium Stress in Elliptical Vessel

    Homework Statement derive the equilibrium state of the stress at a point in a circular pressurized vessel, membrane equation, in terms of σ_a and σ_b and internal pressure b. Figure is picture of a thin walled pressurized elliptical vessel (like a sphere vessel except with horizontal...
  41. V

    A vessel filled with two liquid how to determine boant force?

    A vessel filled with two liquid how to determine boyant force? A vessel contains oil of density(800kgm-3) over mercury (density 13600kgm-3) A homogeneous Sphere is floats with half of its volume immersed in mercury and other half in oil. What is density of the material of the sphere? How...
  42. V

    Suddenly stop a moving moving vessel filled with gasses. What will change in temp?

    1 g mole of oxygen at 27 degree Celsius and 1 atmospheric pressure is enclosed in a vessel. The vessel is thermally insulated. This vessel is moving with speed of v0. Suddenly it is stopped. what will change in temperature of the gas. How i did it. first of all i find the root mean speed of the...
  43. H

    Finding Vel. and Pressure of blood flow in vessel

    helping a relative with their final studying but its been a few years since I've taken intro phys Suppose a blood vessel is horizontal and it has wide and narrow cross sections as shown in Fig 1. In the real life the edges are not sharp and we assume their effects are negligible. Suppose the...
  44. A

    ASME Boiler & Vessel Pressure Code Links

    Dose anybody can give me link for ASME codes for boiler & vessel pressure. Thanks
  45. G

    Need help on this gas flowing into a vessel problem

    1. Homework Statement An evacuated rigid vessel is filled adiabatically through a valve from a large constant pressure source of a certain gas, until the pressures inside and outside are equal. If the P-U-V relation for the gas is given by the equation: U = 831 + 2PV where U is joules, P is...
  46. G

    Dire need of help on this gas flowing into a vessel problem

    Homework Statement An evacuated rigid vessel is filled adiabatically through a valve from a large constant pressure source of a certain gas, until the pressures inside and outside are equal. If the P-U-V relation for the gas is given by the equation: U = 831 + 2PV...
  47. M

    How to calculate the pressure in a sealed vessel with water.

    Hi, I cannot find any equation to help determine the resultant pressure from heating water in a sealed metal container, all I find is PV-nRt which is only gas - We are heating doing this in part to pretreat biomass. sealed tube: vol =170cc containing 80ml.s water: tube heated to 180C. I...
  48. W

    Pressure diffence between water column in capillary tube and open vessel

    Homework Statement It is known that water in a capillary will rise to a certain height, as shown in the figure. Comparing the points P and Q, which point exhibit larger pressure? a. P b. Q c. The pressure of P and Q are the same Homework Equations F_upward=2*pi*R*T*cos⁡θ W=pi*R^2*...
  49. L

    Shore power supply for the vessel

    Hi all, I am facing the problem with shore power supply for the vessel. At our ship yard, sometimes we need to arrange temporary electric supply for the vessel meanwhile their generators are overhauled. For 440 V 60 Hz i am using portable generator supply and for 415 V 50 Hz supply i am...
  50. J

    How much steam to raise vessel temperature from 0 to 28 C?

    Homework Statement A vessel whose walls are thermally insulated contains 2.40kg of water and 0.450kg of ice, all at a temperature of 0.0 C. The outlet of a tube leading from a boiler in which water is boiling at atmospheric pressure is inserted into the water. How many grams of steam must...
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