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  • Users: maxh
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  1. maxh

    Sound speed in gas pipes

    Hi Guys, An interesting question for you. Does the sound speed of air (or any other gas) contained in a pipe vary from what you would calculate in from the typical formula v = (k.g.R.T)^0.5 ? Where v = sonic velocity k = Cp/Cv R = Universal gas constant T = Absolute temp Would the size and...
  2. maxh

    Air volumes

    Hi - can anyone help on this I have a water tank 10m o/heads by 2.6m diameter operating at 8 to 10 BarG. The water tank is situated outside, is uninsulated, and the water temperature is generally 5C throughout the year, to prevent freezing in winter extremes the tank has immersion heaters...
  3. maxh

    Nozzle opening calculations

    Hi I am wondering how to consider an opening in a pipe manifold. I have a 12"NB pipe manifold that at the end terminates with a standard pipe cap. However, what I wish to do is cut a 6" i/dia hole centrally in the 12"NB pipe cap, then weld a 8"NB pipe onto the pipecap in such that the 6"...
  4. maxh

    Protection of pressure vessels in hot, sunny

    Dear all I have to provide some pressure vessels, containing unheated water at up to 20 BarG, for use in Saudi Arabia on a pumping station. The vessels are located outdoors and our client has suggested that we need to protect the vessels against the sun. Has anyone experience of these type of...
  5. maxh

    A333 Gr 6 Impact values at -80 C

    Hi Guys, I am looking at using A333 Gr6 for a low temp duty, but the equipment is made in Sch 160 pipe to PD5500 vessel code and the computed impact test temperature requirment is -77 Deg C, that standard test temperature for the material is somewhat lower. Can anyone help me with some...
  6. maxh

    Indian boiler code

    Indian Boiler Code ? I have to make a small pressure vessel (a pulsation dampener) to Indian Boiler Code. I am given to understand that I must apply to an Indian state to register / appraise the design in order to comply with the code requirements, much like you might apply in Canada. Can...
  7. maxh

    Noise transmitted thro the ground

    Hi everyone, Has anyone got some experience of stopping ground borne noise transmission ? I have a problem with a pump in a wet well which is transmitting noise to a dwelling some 50 yards away. The noise is definitley coming through the ground as you can hear it in the walls. It is a...
  8. maxh

    Twin orifice plate noise

    Hi everyone, Here is a question that has vexed me for a while. If I have two orifice plates in-line say 10D apart, if each orifice plate has a pressure drop that is higher than the criticle pressure ratio for the inidividual plate, then in calculating the noise level after the second orifice...
  9. maxh

    Printing Excel Cells in AutoCAD

    Hi Everyone, Can anyone tell me why when I import an Excel spreadsheet cell into AutoCAD LT I get a border printed for the top and lefthand side of the cell. I just want the text to appear and have the drawing linked to the spreadsheet so that when the spreadsheet changes the values on the...
  10. maxh

    FEA for noise

    Hello Can anyone tell me if FEA packages can analyse noise problems ? To be specific I would like to examine how noise travels through pipes, elbows, tee's etc. We have Solidworks and can build a solid model of what we wish to examine but finding the right software package that can examine...
  11. maxh

    Sand hood for a stack

    Hi everyone, I am looking for some inspiration or someone to tell me don't be so daft. I have been asked to design a sand hood to keep sand out of a vent stack (an air compressor by-pass vent) in a middle eastern country that has sand storms. The stack is some 2 metres in diameter and all I...
  12. maxh

    Liquid compressibility - resources

    Can anyone suggest some free on-line resources / tables for calculating liquid compressibilities ?
  13. maxh

    Pulsation from a progressing cavity pump ?

    We have a 'vibration' problem with a progressing cavity pump or Moineau pump. The discharge pipework (4"NB) is suffering from high vibration levels when the pump is operating at the top end of its speed range. Although the pump is driven by a variable drive and we could operate at lower...
  14. maxh

    Pulsation from a progressing cavity pump

    We have a 'vibration' problem with a progressing cavity pump or Moineau pump. The discharge pipework is suffering from high vibration levels when the pump is operating at the top end of its speed range. Although the pump is driven by a variable drive and we could operate at lower speeds we...
  15. maxh

    Noise along pipewalls

    Can anyone help with some guidance on reducing or mitigating the phenomenom of noise transmission along pipewalls (in this context pipe means the sort of pipe you get on a process plant - ie 2" dia up to 30" dia and 1/2" to 1" thick). I have some basic information on the use...
  16. maxh

    Compatibility of Carbon Steel and liquid CO2

    Hello Can anyone give some advice or guidance on the compatibility of carbon steel with carbon dioxide in its liquid form. We have been asked to provide a pressure vessel constructed in carbon steel, SA516-70, to contain CO2 liquid at 16 deg C and 57 BarG. Our experience with liquid CO2 and...

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