Booster Basics Presentation

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Information about Booster Basics Presentation
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Published on November 7, 2007

Author: Reva

Source: authorstream.com

Slide1:  Booster System Basics: Constant Speed Systems Pressure Booster Systems:  WHAT IS A BOOSTER SYSTEM? BOOSTER SIZING REQUIREMENTS BOOSTER SYSTEM CONTROL ENERGY SAVING STRATEGIES DRAWDOWN TANKS Pressure Booster Systems What is a Pressure Booster System? :  All components mounted on a common base, tested and calibrated to site conditions What is a Pressure Booster System? Pumps Control Panel Headers, Piping and Isolation Valves, Pressure gauges, Solenoid Valve, Aquastat and copper tubing Pressure Reducing Valves What you need to size a booster system?:  What you need to size a booster system? Calculate the total flow requirement for the building Number of Domestic Water Fixtures Type of fixtures in the building Type of building (residential, public, heavy use) Special services Total Flow = Total Fixture Units:  Total Flow = Total Fixture Units What you need to size a booster system?:  What you need to size a booster system? Calculate the total flow requirement for the building Calculate the total pressure required for the building Static Pressure:  Static Pressure Based on the vertical boost required above the packaged system manifold This component never varies Fixture Pressure:  Fixture Pressure Required pressure to operate fixture at farthest point from system. Must overcome valve “start-up” pressure (i.e. 25 PSI min. required for flush valves to operate) Never varies, this is always required as a minimum Packaged System Losses:  Packaged System Losses Systems are designed to have no more than 5psi loss from suction manifold to discharge manifold This must always be added into pressure calculations Available Suction Pressure:  Available Suction Pressure Typically varies by about 10-30 PSI Can vary over time due to growth Can also vary due to municipal re-structuring Friction Losses:  Friction Losses Usually calculated at 10% of total static requirement Typically a very small boost pressure component Can be larger as in the case of boost over a “campus-style” area or large low-rise building Pressure Requirement:  Pressure Requirement Pressure Requirement:  Pressure Requirement Pump Boost Pressure (TDH) = Fixture Pressure + Package Losses + Static Head + Friction Head - Supply Pressure Pressure Requirement:  Pressure Requirement Boost Pressure = System Pressure - Supply Pressure Significance of System Flow in Booster Systems:  Significance of System Flow in Booster Systems Flow impacts system demand, not pressure - as demand increases, flow must increase at a constant output pressure Flow governs pump actuation - therefore, flow should govern pump sequencing and actuation System capacity matched to system flow requirement is most efficient and cost effective for domestic water pressure boosting What are the most popular methods of booster pump control ?:  What are the most popular methods of booster pump control ? Flow meter or flow switch Instrument is in contact with corrosive water therefore requiring more maintenance What are the most popular methods of booster pump control ?:  What are the most popular methods of booster pump control ? Flow meter or flow switch Pressure Switch Requires non-overloading (NOL) motors Requires a pressure drop across operating range Can be unstable in operation resulting in “starving” the system of water (end of curve operation) Mechanical switches increase possibility of failure Effect of Suction Pressure:  Effect of Suction Pressure Effect of Suction Pressure :  Effect of Suction Pressure What are the most popular methods of booster pump control ?:  What are the most popular methods of booster pump control ? Flow meter or flow switch Pressure Switch Current or kW Sensing Current Sensing:  Current Sensing As the flow increases, so does the pump load The motor must match the pump load Current / Power draw for motors is proportional to the load (pump flow work) Current - Flow Relationship:  Current - Flow Relationship Effect of Suction Pressure:  Effect of Suction Pressure Effect of Suction Pressure :  Effect of Suction Pressure Effects of Voltage Fluctuations on Motors:  Effects of Voltage Fluctuations on Motors Current Sensing:  Current Sensing Motors sized to match the power requirement Current sensing allows flexible pump sizing to match the system load profile and energy requirement Duplex: Triplex: 33% - 67% capacity split 20% - 40% - 40% capacity split Slide27:  Duplex allows up to three steps of sequencing Current Sensing Current Sensing:  Current Sensing Triplex allows up to five steps of sequencing Typical Daily Demand Curve:  Typical Daily Demand Curve Duplex Booster - 50/50 Split Conventional Split:  Duplex Booster - 50/50 Split Conventional Split Duplex Booster - 33/67 Split 3 Step Control with No-flow shutdown:  Duplex Booster - 33/67 Split 3 Step Control with No-flow shutdown Energy Consumption:  HP = GPM X Feet (Head) Energy Consumption Smaller pump at lower flows will be more efficient and consume less energy Smaller motor is more efficient at lower loads 3960 X (Pump Eff) x (Motor Eff) Energy Savings Conventional vs. 33/67 Split:  Energy Savings Conventional vs. 33/67 Split Slide34:  Total Energy Savings = 19% Energy Cost = $0.12 / kWhr Savings per Year: $2,280 Energy Savings Conventional vs. 33/67 Split What are the most popular methods of booster pump control ?:  What are the most popular methods of booster pump control ? Flow meter or flow switch Pressure Switch Current or kW Sensing VFD with pressure transducers No-Flow Shutdown and Tank Sizing:  When do you use it? Where should you install it? What size should it be? No-Flow Shutdown and Tank Sizing Sizing and Selecting Drawdown Tank:  Sizing and Selecting Drawdown Tank Tanks are to be used in systems that do not have a continuous water demand Tanks should NOT be sized according to booster size Tanks should be sized to store 20 - 30 Gallons of water (2 - 3 GPM leak loads) Tanks maintain pressure in piping system and supply small demands to allow pumps to be shutdown Sizing and Selecting Drawdown Tank:  Sizing and Selecting Drawdown Tank Tank Storage Volume is governed by the Ideal Gas Law Solving for storage volume gives: Vstorage = Pdifferential x VTotal Tank (PTotal +PAtmosphere) 3 factors must be considered Tank Volume:  Tank Volume Vstorage = Pdifferential x VTotal Tank (PTotal +PAtmosphere) The bigger the tank, the better the storage Differential Pressure:  Differential Pressure Tank storage Volume is proportional to the difference in the cut out and cut in pressures of the pumps The larger the pressure differential the more water that will be stored in the tank Vstorage = Pdifferential x VTotal Tank (PTotal +PAtmosphere) Pressure Differential Calculation:  Pressure Differential Calculation Pdifferential = Pstop - Pstart Pstop = Pressure at the tank when the system shuts down For adjacent or package mounted tanks, this means the suction pressure plus the shutoff head of the pump For remote mounted tanks, this is simply the normal system pressure at the location of the tank Pressure Differential Calculation:  Pressure Differential Calculation Pdifferential = Pstop - Pstart Pstart = Pressure at the tank when the system starts again down For adjacent or package mounted tanks, this means the setting on the no flow (call on) pressure switch For remote mounted tanks, this is simply the system pressure at the location of the tank when the call on pressure switch brings the system back on Total Pressure:  Total Pressure A lower Total Pressure will yield larger water storage for the same pressure differential Lower Total Pressure allows for lower tank pressure rating Vstorage = Pdifferential x VTotal Tank (Ptotal +PAtmosphere) Lower tank pressure rating Sizing and Selecting Drawdown Tank:  Sizing and Selecting Drawdown Tank All three of these factors must be considered in selecting the appropriate tank Vstorage = Pdifferential x VTotal Tank (PTotal +PAtmosphere) Where Should the Tank be Installed ?:  Where Should the Tank be Installed ? Packaged Mounted Tank water storage may be limited by tank size Will require higher tank pressure rating More Costly Difficult to maneuver due to weight and may require building structural reinforcement. Where Should the Tank be Installed ?:  Where Should the Tank be Installed ? Adjacent Mounted Tank is supplied as a loose component for connection on site Tank is not mounted on skid with pumps Contractor has freedom to locate tank in mechanical room System is easier to maneuver Where Should the Tank be Installed?:  Where Should the Tank be Installed? Remote Mounted Roof mounting - Lowers Tank Total Pressure and Tank Pressure Rating Required Allows for the use of smaller tanks for desired water storage Contractor has flexibility locating and installing tank Questions & Answers:  Questions & Answers Thank You:  Thank You

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