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  • 25.04.18 Posted in Pumps Quick Reference Guides By Margie Moschetti

    PUMP DEFINITIONS AND NOMENCLATURE
     
    Head – is the maximum height that the pump can achieve pumping against gravity. 
     
    Rate of Flow – the total volume throughput per unit of time at suction conditions.  Capacity is another term.
     
    Net Positive Suction Head (NPSH) – the minimum pressure required at the suction port of the pump to keep the pump from cavitating. 
     
    Impeller – The bladed member of a rotating assembly of the pump which imparts the principal force to the liquid pumped.
     
    Casing – the portion of the pump that includes the impeller chamber and volute diffuser.
     
    Volute – is the casing that receives the fluid being pumped by the impeller, slowing down the fluid’s rate of flow.  A volute is a curved funnel that increases in area as it approaches the discharge port. 
     
    Diffuser – A set of stationary vanes that surround the impeller.  The purpose of the diffuser is to increase the efficiency in the pump by allowing more gradual expansion and less turbulent area for the liquid to reduce in velocity.
     
    Inducer – A single-stage axial flow helix installed in the suction eye of an impeller to lower the NPSH.
     
    Centrifugal Pump – produce a head and a flow by increasing the velocity of the liquid through the pump with the help of the rotating vane impeller.  Centrifugal pumps include radial, axial and mixed flow units.  All centrifugal pumps include a shaft-driven impeller that rotates inside a casing.  Liquid flows into the suction inlet of the casing and is thrown to the outside of the casing, then exits the discharge port.  The velocity imparted to the liquid by the impeller is converted to pressure energy or “head”. 
     
    Positive Displacement Pumps – draws fluid into a compartment at the inlet and moves it to an outlet for discharge, most typically using a rotary, reciprocating, or diaphragm method to move fluid.  PD pumps will move fluid at the same speed regardless of the pressure on the inlet end whereas centrifugal pumps will not.

  • 17.04.18 Posted in Videos & Power Points By Margie Moschetti

  • 16.04.18 Posted in Boilers By Margie Moschetti

  • 06.03.18 Posted in Videos & Power Points By Margie Moschetti

  • 27.02.18 Posted in Videos & Power Points By Margie Moschetti

  • 15.02.18 Posted in Valves Quick Reference Guides By Margie Moschetti
    • Mount the valve in a vertical position so that the valve body is self-draining.  If a body drain port is provided, make sure it is open when required by the ASME Code.  Do not plug any bonnet vent openings.  The inlet piping should be as short as possible, with no elbows, and equal to or greater than the size of the pressure relief valve inlet connection.  This will help to limit the inlet pressure drop to 3% or less when the valve is relieving.

     

    • When discharge piping is connected to the valve outlet, make sure it is self-draining when a body drain port is not used.  The valve should not be connected to any discharge pipe that contains pressure before the valve opens or to any pipe where the pressure build-up is greater than 10% of the set pressure when the valve is open and relieving.

     

    • Discharge piping, other than a short tailpipe, must be supported by something other than the valve.  For steam service, a drip pan elbow or flexible connection between the valve and the pipe should be used to prevent excessive pipe stress, due to thermal expansion, from being imposed on the valve body.

     

    • For threaded valves, apply a small amount of pipe thread sealing compound to external threads only.  DO NOT put any sealing compound on the first thread or any internal threads.  To do so may cause the sealing compound to enter the valve and cause seat leakage.  Use wrench flats provided to tighten the valve to the connecting pipe.  Do not use the valve body or bonnet and do not over-tighten.  To do so may cause valve leakage.  

     

    • For flanged valves, use new gaskets and tighten the mounting studs evenly.

    Contact us to take advantage of our resetting and repair services!

     

    INFO@CONTROL-SPECIALTIES.COM

  • 21.01.18 Posted in Videos & Power Points By Margie Moschetti

  • 09.01.18 Posted in Videos & Power Points By Margie Moschetti
    Understanding Water Hammer at Pump Shut-down and Start-upRead More

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