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  1. peterpom

    Is there a reliable, low cost, cont

    Hi there, Why do you not consider a hydraulic system for this? Any electrical system will heat up whilst being held in a stalled condition. The only other option, is to install sufficient cooling capacity to keep the electrical actuator temperature under control. It seems to me that the...
  2. peterpom

    Parts transportation

    Hi Mastertech, I am sorry that I can't give you any recommendations of this stuff. I am in Vietnam right now, and my reference library is in Australia. The last time I used pneumatic conveying was in Australia, so my contacts there (if I could remember them) would probably not help you much...
  3. peterpom

    Lifting of Spiral Tower

    Hi Kaleem546, When lifting large structures, you need to employ a spreader. This is a fabricated frame, that allows you to apply lift to various parts of the structure, so as to minimise distortion of the structure. You really need to get someone with experience to design the frame, as it...
  4. peterpom

    Lasers Vs. Waterjets

    Hi Juanito, The main difference between the methods is in the finish. Laser cutting produces heat at the cutting point, which can leave little drops of slag attached to the edge of the cut, and possibly a little blueing of the metal. These require some finishing work, if you are trying to...
  5. peterpom

    Compatibility tables

    Hi Guys, I have to design a small chemical mixing plant, but cannot find two of the chemicals in my tables. One is Etnanoic Acid CH3COOH and the other is Nitrile-Trimethyl-Phosphonic Acid C3H12NO9P3. In addition two other chemical are mentioned NaNO2 and NH4CI. Does anyone know about these...
  6. peterpom

    Parts transportation

    Hi Mastertech, You have a whole bunch of problems to consider with this project. 1.The first, and most important is financial viability. Conveying anything 100m is expensive, both in installation and running costs. The cost of a man collecting a bin, and moving it 100m is not that much...
  7. peterpom

    piping calculation

    Hi Elpa, Rule of thumb, 6 x 2" pipes equals 1 X 5" (well slightly less actually, so 5" kills it) However, you may find 6" easier to buy. Alternatively, if budget or space are a problem, you need to get ALL the info, and engineer it properly. The most important bit of info...
  8. peterpom

    Pressure drop and noise/vibration

    Noise and vibration associated with pressure drop are simply a function of fluid velocity. Therefore you must aim to achieve the lowest economically feasible velocity. You do not indicate you pipe size, so I have no starting point. Try to achieve a flow of less than 1 m/s and silence will be...
  9. peterpom

    API STD 607 FIRE RATING

    As you valve is an ESD valve, in a oil facility it must be a fire safe valve, normally closed, it must close under any conditions, and it must conform to API requirements. You do not say where you are operating, but in most countries that is a mandatory requirement and failure to comply could...
  10. peterpom

    Offshore pipe lay calculations

    Can anyone help me with a set of calculation to determine the correct angle of penetration, tension, overbend and sag radii for an offshore pipelay barge. I need to program a computer control system to produce these factors dymanically, for any pipe to be laid, to allow adjustments to the...
  11. peterpom

    Swimming Pool pump/filter sizing

    Hi electricpete, It sounds to me that the system is poorly designed and undersized. First to your sand filter. The water flow should be in the top and out the bottom. I have never seen a filter that exits at the halfway level. As you say, half the sand is not in the flow path and useless. I...
  12. peterpom

    pipe material for instrument air

    The use of galvanised pipe for instrument as opposed to plant air is not good practise. If the air is dried to a pressure dew point well below the lowest possible ambient, which it should be for instrument use, there should be no problems. Even so, it is good practise to install good quality...
  13. peterpom

    Atmospheric Tank Venting

    Aim for a maximum air velocity of 1 m per second, under the absolutely worst case possible. Do not forget to add a factor for liquid evaporation if the flash point can be below ambient temperature. If the tank is outside, remember that the tank temperature can rise well above ambient in...

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