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. P

    Raising a Sunken Vessel: Calculating Air & Water Flow

    This is a real world problem. We have a vessel sunk in about 50' of water and need to raise it. We have devised a way to pump the water out and pump air into replace the water. It is important that we keep the differential pressure very close to Zero and running a "snorkle" tube is not an...
  2. B

    Calculating the Size of a Pressure Vessel for 9 bar/130.5 psi

    I would like to make a pressure vessel with a pressure of about 9 bars/130.5 psi, that contains about 250 grams of water at about 175 degrees Celsius. My question is how big should the pressure vessel be.
  3. H

    Thin walled pressure vessel with added forces

    Homework Statement Hi, this is my first time posting so I hope you can see the attachment. Homework Equations Hoop stress = pr/t Longitudinal stress = pr/2t The Attempt at a Solution I am stuck on part a), afterwards I think I should be fine. I am guessing you can "add" axial...
  4. C

    Drilling Holes in Pressure Vessel Flanges

    Hello, I have been designing a pressure vessel for the last week. I have based all my maximum allowable stresses on ASME code but can't figure out how to include drilled holes. I plan to be using a pipe welded to a cap at one end and attached to a blind flange with holes drilled in it at the...
  5. S

    Pressure Vessel End Cap Deflection

    Hey everyone, hoping someone can point me in the right direction with a deflection question. A pressure vessel I'm working on needs to be pressure tested before it can be shipped out to the customer, so I'm having a large plate cut to match the flange. The opening is about 1500mm in diameter...
  6. W

    Compress air vessel has a volume of 10 ft3 .Cooling coils holds

    Homework Statement Compress air vessel has a volume of 10 ft3 .Cooling coils holds its temperature at 68F. The pressure now in the vessel is 100 psi. Air is flowing in at the rate of 10 lbm/hr.How fast is the pressure increasing? The Attempt at a Solution What I have done is...
  7. R

    Designing Pressure Vessel for Heating Air to 500 C

    Hi Guys I need to design a Cylindrical vessel, in which Air is to be heated from the bottom upto temperatures as high as about 500 C( 773 K) Since it s a closed vessel , the pressure will reach around 2.5bars. The volume of the vessel should be something around 1 litre. I know how to...
  8. R

    Find Time to Empty Water in Vessel

    Homework Statement A vessel of cross section 20 cm2 has at the bottom a horizontal capillary tube of length 10 cm and internal diameter 0.5 mm. It is initially filled with water to a height of 50 cm. Find the time taken to empty one half of the content in the vessel. Viscosity of water is...
  9. I

    Why Do Stress Levels Vary Between Two Gauges on a Thin-Walled Pressure Vessel?

    pls help-- thin-walled pressure vessel Hi, all. I have done an experiment of “thin-walled pressure vessel”. The vessel: length 200mm, outside radius 526mm, inner radius 47.6mm. There were two rectangle rosettes gauge in the vessel surface. Based on the experiment data (100 psi), the actual...
  10. M

    Calculating Water Treatment Vessel Size for Condominiums

    Recently, my boss asked me about the calculation or formula to calculate the size of water filter vessel ( bullet shape ) which is suitable for a condominium. I fail to find any formula from the Internet, so can someone help me to find the formula? Much appreciation. From one of the...
  11. P

    Finding Optimal Thickness for 50 MPa Pressure Vessel

    Homework Statement [PLAIN]http://img714.imageshack.us/img714/7747/43416215.jpg The attempt at a solution I have already solved parts (a) and (b). It's part (c) that I can't get. To get a minimum thickness at 50 MPa, I thought that the hoop stress equation would govern. Here is my...
  12. G

    High temperature pressure vessel seal

    Hello, I am looking for a seal design that would seal between the end plate and cylindrical section of a pressure vessel . The vessel is made of hastelloy X and has a working pressure of 4000 psi and a working temperature of 1600 deg F. ------------- ------ ...
  13. L

    Calculating Deflagratio Pressure in a Closed Vessel

    Forgive me because I'm not a math or physics wiz but I'm at a dead end trying to calculate the pressure generated by a deflagration inside a cylinder. I have been searching for a formula but I've come up with nothing. Here is an example scenario: I have a cylinder with a height of 9cm and...
  14. L

    Making a pressure vessel out of an oil barrel

    Hi, I want to build a pressure vessel for casting Polyurethane under pressure. Does anyone know if it is safe to put an oil barrel under a pressure of 60 PSI ? (It has to be a barrel that can be opened and closed with a lid, other wise I can't put the mold in. :smile: )
  15. T

    My Air Mattress as a Pressure Vessel

    I wanted to make a free body diagram of my air mattress. The mattress is comprised of air cells. Each air cell is a 30 inches in length with a diameter of about 4 inches. Each cell is inflated to about 0.4 psi. If I wanted to accurately model the whole bed (not just one individual cell)...
  16. B

    Pressure vessel fatigue analysis

    Hi, I am wondering if there is any guideline and examples of design and analysis according to EN13445.
  17. X

    Pressure Vessel End Cap Velocity

    If you had a pressure vessel with an end-cap welded on and this girth weld was to fail, how might you calculate the velocity of the end-cap assuming the tank is pressurized with water?
  18. A

    How Do You Calculate Stress and Diameter Change in a Spherical Pressure Vessel?

    Homework Statement The inner diameter of a spherical gas container is 5m, has a wall thickness of 24mm and it is made of steel for which E=200GPa and v=0.29. Knowing the gauge presure in the container is increased from zero to 1.8MPA determine: a) The maximum normal stress in the container...
  19. C

    Distance between planet and vessel - Trig problem

    Hello. Up until this point I have been solving this numerically, by propagating the state vectors and checking for a collision, however that is inefficient, so I would like an analytic solution. Given lengths r, and d, as well as angle t, is there a way to find length s?
  20. Math Is Hard

    Medical Broken blood vessel in finger joint

    Friday morning I was sitting at my desk when I felt this burning sensation in my left hand. Suddenly the middle joint of my index finger started swelling up and it was very painful. Then the middle joint turned purple and looked like it had been hit with a hammer. It's been two days now and...
  21. C

    Sonic Antifouling for Marine Vessel

    Need help with understanding with visual diagram how sonic antifouling for marine vessels work.
  22. I

    News North Korean Torpedo Sinks SK Naval Vessel

    http://www.newscientist.com/blogs/shortsharpscience/2010/05/deadly-bubble-jet.html This is insane, and frightening. The USA diplomatic response: https://www.youtube.com/watch?v=<object width="480" height="385"><param name="movie"...
  23. E

    Shell thickness of a pressure vessel required subjected to a cyclic pressure

    I was wondering if anyone could help me with the following question, please: A thin walled pressure vessel is to be used as a pressure accumulator in a number of situations all involving a number of different operation conditions some of which create cyclic stresses. The dimentions of the...
  24. M

    Pressure vessel recertification?

    I have a vessel designed, built and certified to ASME Section VIII, Div 1, design rating of 100 psi at a maximum tempeature of 200 F. The new operating conditions for the vessel have changed. It will be operating at a maximum pressure of 30 psi at a maximum temperature of 260 F. Does the...
  25. S

    Physics behind blood vessel constriction and blood pressure?

    First of all I have to say I have really confused myself on this one by overthinking and I'll ask my questions step by step. Any help would be greatly appreciated. General rule is when blood vessels constrict blood pressure increases. 1. Ok there is a container and gas molecules in it. If I...
  26. M

    Calculating Vessel Depressurization: What Factors Affect the Time Required?

    Hi, I want to know how I calculate the mass flow rate, volumetric flow rate and time required to depressurize a vessel, knowing the pressure inside the vessel, the output pressure, the orifice and the gas characteristics. For example, imagine a vessel full of compressed air (let’s say 10...
  27. S

    Is Operating a Pressure Vessel Above MAWP Safe at Ambient Temperatures?

    A pressure vessel is stamped with an MAWP of 150 psi at 450ºF. We are operating at 120 psi at ambient temperatures around 70ºF. Is it allowed to operate at the MAWP with a relief valve set to 165 psi if operating temperatures are always at the ambient level.
  28. P

    Vacuum vessel / distiller correct wall thickness?

    vacuum vessel / distiller correct wall thickness?? Hello! I have a vacuum vessel / distiller type of vessel with following:- Temperature inside the vessel max. 200°C [Celcius] and a Vacuum at max. -80kPa = -0.8bar Material: SS-304 = Stainless Steel Volume = 0.654m³ My main question...
  29. N

    How Can I Calculate the Volume of a Pressure Vessel with Limited Data?

    Im finding it really difficult to calculate the volume of a pressure vessel for my project. I have been only given values of pressure and temperature, where the pressure is 80psi and temperature is at room temp. Its difficult using the ideal gas law as i don't know the number of moles, nor i...
  30. D

    Medical Cerebral small vessel disease does it lead to dementia?

    Cerebral small vessel disease...does it lead to dementia? My mum (51) has recently had a TIA and has been diagnosed with CSVD. She has some dysphasia and memory trouble. She has had bloods...all normal, lipids at 5.5 (put on meds to bring it down to 3.5), carotid dopplers - normal, all vitals...
  31. G

    Pressure Vessel Design: Understanding MAWP & Design Pressure

    I have a question regarding the design of pressure vessels, which is: what is the 'maximum allowable working pressure'? i know the definition and all but i am struggling to understand whether the design pressure is based on the operating pressure or the MAWP? For example, let the given...
  32. H

    How do I make a saturated vapor vessel?

    I have been trying to create a 100% saturated steam (no N2) environment, which should not be too hard but so far I have been puzzled by my observations. For this I have obtained a vacuum vessel (1 ft high by 1 ft diameter cylinder) and a roughing vacuum pump. I have instrumented a pressure...
  33. BasketDaN

    Need a unique type of pressure vessel

    I have a very odd need for an experiment I'm doing. I require a container of at least 32 fluid ounce volume that is very rigid and strong; it needs to be able to resist preferably at least 100psi internal pressure (water will be inside) without deforming. The opening needs to be at least 2" in...
  34. E

    Temporarily communicating vessel isolated hydroelectric power plant

    Temporarily communicating vessel isolated hydroelectric power plant with swimming piston, driven through hydrostatic pressure One fixes to the bottom of a pool filled with water a cylinder also filled with water. On the bottom of the cylinder there is an initially closed valve, referred to as...
  35. Y

    Calculating float line for a cone shaped vessel

    Hello all, I'm trying to calculate the float line on a conical shaped vessel in water. The properties of the vessel are: Weight - 10kg Area of base of vessel - 0.311m2 I am using an equation I came across here: http://answers.yahoo.com/question/index?qid=20080317200108AA5yNzY"...
  36. G

    Pressure-Volume PV=C Air & Water in sealed vessel.

    Homework Statement Homework Equations I cannot work out the last part (iii) All other parts have been solved. The Attempt at a Solution From part (ii) I found the new height of the water, and therefore the volume of water and air in the vessel. The Pressure of the water P1 can't...
  37. G

    ASME Boiler and pressure vessel code

    Does anybody knwo how calculate the required cross-sectional area of the bolts with internal pressure, according to the ASME code? I mean in which section, appendix, whatever. I have spent a lot of time trying to find this and I could not. But I can´t believe that an important standard, like...
  38. kandelabr

    Carbon fiber, kevlar pressure vessel design standards

    hi, i can't find any standard defining design of unfired pressure vessels made from carbon fiber, kevlar, fiberglass or similar high tensile strength materials*. do standards like these even exist, since these materials are relatively new? * you know any more similarly competitive materials...
  39. D

    Explosive pressure in a vessel

    Hi, I have no chemistry background and my head is swimming with heat of formation heat of combustion heat of explosion enthalpy ideal gas law and so on What I'm trying to find out is how would I go about calculating the maximum pressure produced inside a vessel when a known amount of...
  40. F

    Pressure vessel certification?

    Hi All I'm looking into getting some shell and tube heat exchangers ASME certified for my company and was wondering if anyone could help me with the process. I know that we are trying to get a "U" stamp and need to get the code books that are required. There is also a few forms that we have...
  41. B

    Magnitude of a Force on a hatch in a Vessel.

    Homework Statement We're told the density of ever material involved here, the liquid in the vessel, called "LAB", the water on the outside, and the acryllic that the vessed is made of. LAB: 860 kg/m^3 Water: 1000 kg/m^3 Acryllic: 1185kg/m^3 Also, the wall thickness of the vessel is 5.4 cm...
  42. B

    Magnitude of a Force on a hatch in a Vessel.

    Homework Statement We're told the density of ever material involved here, the liquid in the vessel, called "LAB", the water on the outside, and the acryllic that the vessed is made of. LAB: 860 kg/m^3 Water: 1000 kg/m^3 Acryllic: 1185kg/m^3 Also, the wall thickness of the vessel is 5.4...
  43. D

    Pressure vessel test chamber problem

    I have to design a chamber where a range of small pressure vessels can be safely pressure tested. They range up to around 10 litres in capacity and are tested at 45 barg. The vessel is a thick wall tube with two domed end caps welded construction. I would like some guidance on how to calculate...
  44. B

    Stored Energy in a pressure vessel

    Consider a problem where a tank holds compressed natural gas, compressed to approx. 250 times atmospheric conditions. Now release the tank valve letting some of the gas out. Assuming a small timestep, I can approximate the energy lost as 1/2 mv^2, where m is the mass released during the...
  45. A

    Thermodynamics: Water vapor vessel plunged into water ice bath

    Homework Statement A closed rigid vessel contains 0.1 kg of water vapor (steam) at 1 bar and 200 C. The vessel is plunged into a bath containing water and ice. After the vessel cools and reaches equilibrium with the bath, the bath still contains water and ice. a. What is the volume...
  46. M

    What are the factors to consider when designing a pressure vessel?

    Hi guys.. I am currently working on a research where I have totally no idea in. What are the factors i need to take into consideration if I were to design a pressure vessel?
  47. S

    Measuring the gas temperature inside a vessel on the outside of the vessel

    Hello, I got a pratical problem; I want to know the gas temperature of SF6 gas inside a vessel. I can't insert a temperature probe to measure the temp. What i can do is clamp a temp. probe to the ouside of the vessel. Does this gives me a realistic reading, bare in mind the wetter...
  48. D

    Pressure vessel leakage - time to equalize

    Hi all, I have a problem I hope someone could help. I have a pressurized dry Nitrogen vessel. Given a known leakage rate, how long will it take for the internal pressure to be equal to atmospheric pressure?
  49. F

    Phase equilibrium in a vessel with unsteady flow

    Hi all - my first post. What a great resource! Homework Statement I have an initially closed, pressurised vessel at ambient temperature, with a single species in it at dynamic equilibrium with some volume fraction of vapour and liquid. I am in the "wet vapour" region of the P-v-T...
  50. R

    Pressure vessel and resulting flow through a pipe

    Hi everybody, I've been going around in circles with this problem and not sure if I'm approaching it correctly. I have a vessel filled with a fluid and connected to a pipe (circular cross section) with a tap on the end. The pressure on the vessel is not atmospheric, it is about 1 bar...
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