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Tabrez Mahamad

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About Tabrez Mahamad

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  • Location
    New Berlin USA

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  • Engineering Qualification
    Mechanical Engineering
  • Year of Completition
  • Interests
    Hydraulics, Pneumatics, Engineering Design
  • Designation / Job Title
    Mechanical Engineer
  1. A pipe is usually defined by its internal diameter unlike a tube that is defined by its external diameter. Both the pipe and tube are available in different wall thicknesses. A pipe however is most commonly available in only two thicknesses defined by schedule 40 and schedule 80. A pipe's primary purpose is to facilitate fluid flow. The pipe diameter and thickness is selected considering the following factors. The amount of fluid flow it needs to allow, the available pressure capacity of the fluid pump and the required pressure differential to get the fluid from point A to point B over some distance and altitude. A schedule 80 pipe is thicker and is used when the fluid pressure is higher. A larger diameter is used when the flow is higher and the available source pressure is limited. Sometimes, a schedule 80 pipe may be unable to withstand the higher pressure, so a larger diameter pipe may be chosen to reduce the pressure differential. Conversely, a relatively lower pressure differential would mean that a schedule 40 pipe is used. Pipes are available in many materials such as PVC, Polypropelene, Steel (usually galvanized for corrosion resistance) and aluminum (usually annodized for corrosion resistance). A tube is traditonally used for non-fluid flow applications usually in some type of structural or non-structural fabrication. Although, a round tube is sometimes used to facilitate flow. A tube is usually made out of steel and aliminum. It is also available in other shapes such as a square or a rectangular tube.
  2. Although my expertise is not Aeronautics, I will attempt to answer using just common engineering sense. A helicopter uses primarily vertical propulsion to gain elevation using the propeller placed above the helicopter over a large area to cover more ground. The long blades of the propeller allow the helicopter to propel the weight upwards at a relatively lower pressure differential. A helicopter moves at a much slower speed compared to an airplane. It is also limited to relatively lower altitude. An aeroplane uses lateral propulsion. The two relatively smaller turbines are located on each side of the plane. They move air at a much higher velocity at a much higher RPM. The air plane uses the momentum and the nose angle of the plane to aid its lift off. It also uses its long wings and its aerodynamic shape of the fuselage to have the least amount of resistance from air and maximize its glide to stay in air. The airplane can move at much higher speeds and achieve a much higher altitude using its lateral propulsion. The airplane is unable to achieve a vertical lift off like a helicopter.
  3. Simply put, pumps are used when you require a higher flow at a low pressure differential. An excellent application example for this is an inflatable park where the pressure differential is only a few PSI. A compressor is used when the target pressure differential is high, usually about 50 PSI to 180 PSI depending on the type of compressor used. The target flow rates are comparable to a pump but are generally on the lower side for any given size. A compressor is usually used in industrial applications to power pnuematic tools and equipment.
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