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Oil, gas and petrochemical process industries

    Pumps (Questions)

    Talib Al_Munawri

    Posts : 337
    Join date : 2009-07-03
    Age : 30
    Location : Sultanate of Oman

    Pumps (Questions)

    Post by Talib Al_Munawri on Fri Sep 04, 2009 8:46 am

    Pumps (Questions)

    1)When can a liquid or gas flow through a pipe?

    -If the difference between the pressure at the start and end is high enough.

    2)What does the type of seal of a pump or compressor depend on?

    -pressure flow and medium

    3)When would you use positive displacement pump?

    -high discharge pressure and low flow

    4)What is the purpose of a pump received?

    -Accommodating pressure fluctuations.

    5)What does a double-acting piston have, which single acting pump dose notes have?

    -Additional set of valves.

    6)What are diaphragm pumps useful for?

    -corrosive liquid

    7)Which two pumps are rotating positive displacement pumps?

    -Gear pump and vane pump.

    8)What is hose pump useful for?

    -Corrosive liquid and small flows.

    9)What principle in the operation of dynamic pumps based on?

    -Velocity is converted to pressure.

    10)What dose non-self priming pumps have to contain to operate?


    11)How can you recognize a turbine pump?

    -Several impellers on one shaft.

    12)When might you select an axial pump?

    -cooling water

    13What is positive displacement principle?

    -Mechanical energy is converted to pressure energy.

    14)What is the total static head of pump or compressor equal to?

    -Difference between the discharge and suction pipe.

    15)What dose capacity of non-rotating positive displacement pump depends on?

    -Speed of rotation and stroke volume

    16)What is the difference between piston pump a plunger pump?

    -seal location

    17)What dose the capacity of a rotating positive displacement pump depend on?

    -Speed of rotation and volume of the rotating pocket.

    18)Which pump can have both internal external teeth?

    -gear pump

    19)What can you pump with a progressive cavity pump?

    -Suspensions and pastes.

    20)What is disadvantage of dynamic pump?


    21)What dose capacity of centrifugal pump depend on?

    -Speed of rotation and impeller shape.

    22)What is the NPSH of pump?

    -Minimum suction head

    23)What is cavitation?

    -implosion of vapory bubbles in the discharge pipe

    24)Which relationship is shown graphical by the characteristic curve pump?

    -Flow and pressure.

    25)what is the capacity of the pumps?

    -the volume , or amount, of liquid that the pump can move from one point to another in a set amount of time.

    26)Write the equation find maximum pump capacity?

    -capacity = piston area x length of stroke x full stroke per minute

    27)What are four factors that affect the efficiency of the pump?

    -Wear of pump parts.
    -Viscosity of the pumped liquid.
    -Dirty liquid
    -The temperature of the pumped liquid.

    28)vibration can be cause by:

    -suction or discharge problems

    29)How we can prevent vibration?

    -correct pump construction
    -proper motor and pump balancing
    -proper use of bearing

    30)what the steps must do if the vibration occurs?

    -the pump must immediately be stopped
    -The cause of the vibration must be found and repaired.

    31)What are caused of cavitation?

    -A restricted pump inlet (suction closed or suction blocked).
    -The pump operating near to its NPSH.
    -The liquid being pumped are too hot
    -The pump casing is too hot
    -The pump discharge valves are blocked in.
    -The discharge pressure is too high

    32)How we can correct cavitation?

    -The NPSH available must be decreased
    -The pumping rate must be decreased.

    33)Vapour lock can be caused by one or more caused. What are they?

    -low liquid level in the vessel being pumped out
    -low flow through the pump
    -Gases trapped in the suction liquids.

    34)How we can prevent gas from entering the pump?

    -Raising the suction pressure to the pump.
    -Raising the level of liquid in the vessel that is being pumped.
    -Degassing (removing the gas from) the suction liquids.

    35)What are three properties of a packing seal?

    - require attention
    - Cheap
    - leaks slightly

    36)Which pump can you use to handle a paste?

    -progressive cavity pump

    37)Which three pumps can you use the handle water?

    -progressive cavity pump
    -vane pump
    -hose pump

    38)Which pump is suitable 30% hydrochloric acid?

    -hose pump

    39)What is the function of the diffuser?

    -reducing turbulence

    40)Which two factors can inverse the likelihood of cavitation?

    -hot medium
    -higher rotational speed

    41)What displacement pumps depend on?

    -speed of rotation
    -volume of the pockets

      Current date/time is Mon Feb 19, 2018 1:24 am