sizing and specifying domestic water boosters - … - sizing booster pumps... · sizing and...
TRANSCRIPT
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Sizing and Specifying Domestic Water Boosters
Richard Hanson, SyncroFloDavid Romaine, SyncroFlo
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Dedication
David Hanson, PE
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Our GoalDid your design meet the technical needs?
Was the product the best value for the budget?
If something broke, did the pump system still run?
Can you buy replacement parts 20 years later?
Does it still run automatically years after shipment?
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Domestic Water Boosters
What’s NewWhat’s Wrong
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VFD Benefits
• ENERGY SAVINGS• Smooth hydraulics• System pressure adjustment• Maintenance of PRV’s
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Dust
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Energy Savings
• Tank• Tank Location• Pump Duty Point• Pump Speed• Pump Type• VFD
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New Tank Tricks
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Low Flow Verification Problem
• Flow switch (1 FPS) – $• Paddlewheel flow sensor (1/4 FPS) – $$• Magnetic flow sensor (1/8 FPS) – $$$$$
• 10 GPM in a 4” pipe = 1/4 FPS• 10 GPM in a 6” pipe = .12 FPS
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Solution
• Sense low flow (power, pump differential, speed)
• Slow down pump• TEST to see if
pressure holds• Stop pump if
pressure holds
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Overpressurization
• Just before shutdown• 10 psi standard• Adjustable
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New Sequencing Tricks
• Pressure• Flow• Current• VFD Speed• Power• Differential Pressure• Combinations thereof
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Problem
• Flow sequencing is best way to prevent pump cavitation BUT . . .– Flow switches: inaccurate, unreliable– Flow sensors: unreliable, expensive– Installation is expensive, unreliable
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Solution
• Pressure• Power• Differential Pressure• VFD Speed
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Power vs. Pressure
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New Pumps to Consider
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Other Added Value
• Lonworks or BACNetCommunication
• 3D CAD drawings/BIM integration
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Sizing Basics
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Do You Need a Booster?
Building Height (ft x .433 -> PSI) + Friction Losses + Pressure Required at Top = Pressure Required at Base of Building
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+ Friction Losses
• (10% approximately)• Bernoulli’s Equation
• Most common error today??
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Pressure Required @ Top
• Flush Valves• Cooling Tower• High-End Showers
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Do You Need a Booster?
Building Height (ft x .433 -> PSI) + Friction Losses (10% approximately) + Pressure Required at Top = Pressure Required at Base of Building
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Do You Need a Booster?
Pressure Required at Base of Building- Pressure @ flow test location+/- Elevation change- Water Meter loss- Water Softener loss= Pump System Boost
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Scheduling Your Booster
Pump System Boost (we recommend)+ 5 PSI Internal Losses
x 2.31 = Pump TDH (commonly spec’d)
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Protect Yourself!
• System Pressure• Minimum Suction• Maximum Suction
• Pump TDH
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Pressure Control
• Bottom Zone• Zone PRV’s
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Estimating Flow
• Codes• Practice
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Hunters vs Actual
Just Right!Stadiums
25-55%?Hotels, Motels
10-40%?Hospital, Schools
30-75%?Apartment, Office, School
Oversized By:Occupancy Type
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Redundancy Recommendations
1
0
Redundant Pumps
Hospital, Stadiums
Apartment, Office, School, Hotel
Occupancy Type
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Sizing Piping
• 5 PSI Assumed
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http://www.syncroflo.com/sys12/12-Systems.swf
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Pump Options
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Discussion Points
• Importance of selecting the right pump• Typical pumps used in plumbing• Best application for each type• Reading a pump curve• Matching a pump with a system curve• Optimal solution
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1. Importance of the Right Pump
• The pump is the heart of any system• Selecting the right pump for the application• Selecting the highest efficiency pump• Selecting a good quality pump• Understanding the value of down time
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2. Most Popular Pumps
• Close-coupled End Suction
• Vertical Turbine• Column-mounted
Turbines
• Flex-coupled End Suction
• Vertical Multistage• Horizontal Split
Case• Self-priming
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3. Most Popular Pumps
• End Suction Close Coupled• Most popular pump in the world• Small compact design• Small flows at low to medium head• Lowest initial cost• Easy to maintain
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End Suction Pump Curve
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3. Most Popular Pumps
• Horizontal Split Case• Larger foot print than end suction pumps• Large flows and large heads• Highest efficiencies• Best design pump resulting in many
years of trouble free service• Used in variety of applications including
fire fighting• Relatively easy to maintain
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HSC Pump Curve
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3. Types of PumpsVertical Multi-stage
• Low flows at high heads• Minimal space requirements• Difficult to maintain
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VMS Pump Curve
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3. Types of PumpsCanned Turbines
• Can handle large flows at very high heads
• Minimal space requirements
• Does not require a wet well• Very high quality• High efficiencies
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VT Pump Curve
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3. Types of Pumps
Self-priming• Mainly used for
lifting waste water• Can handle large
flows at low heads• Solids handling
capability• Driver options
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4. Pump Curve
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Pump curve
FLOW
HEAD
MATCHING PUMP WITH SYSTEM CURVE
System Curves
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Proper Pump Selection
• Understand what the overall selection criteria are for the system/equipment
• Select the type of pump that best meets the hydraulics as well as design criteria
• Select pump size closest to best efficiency point
• Select the pump according to space availability
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Proper Pump Selection
• Select pump with highest possible efficiency
• Select pump from a manufacturer that offers good after sales support
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Pressure Control
• Variable Speed• Pressure Regulating Valve• Zone PRV’s• None Required
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Tank Sizing
• Higher in the building is better if no PRV’s• How big a tank?
– Acceptable leak load?– Minimum pump flow?– Additional installation cost for bigger tank?– Maintenance, replacement of bigger tanks?
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Tank Efficiency
• Bigger the better for–Energy savings–Reducing pump cycling
• Smaller the better for –Cost–Installation–Maintenance
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Recommendations
• 100 Gallon minimum• 36” x 80” maximum
• Top of building if any of these– VFD– No PRV– >200 psi– Steady suction pressure
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ASPE Recommendation
• Leak load– 0.5% for most commercial buildings– 4% for Hospitals
• Size for 10-30 minute off time
• Locate based on largest storage opportunity, using Boyle’s Law.
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VFD or not &Sequencing Options
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Affinity Laws
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Variable Speed
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Variable Diameter
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VFD Effect
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Less energy • The pressure boost required for variable speed
systems is lower than constant speed, • Variable frequency drives (VFD's) allow no
inrush current • Decreasing the speed of a pump shifts its
efficiency curve to the left. • A VFD drive makes a pump produce the exact
amount of pressure that is required at a particular flow rate.
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Additional benefits:• Easy start-ups• More reliable and self-sufficient operation.• Increased motor bearing and mechanical seal
life• Dramatically reduced sound and motor heat
emissions• More information is available to the operator
– alarm logs– data history– adjustable keypad settings– Remote access to data
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Ideal variable speed pumping application:
• Varying or unpredictable flow rates throughout a 24 hour day.
• Low or at no flow during a large portion of a 24 hour day.
• Suction pressure that is predictably higher • High shutoff head pumps available• Locations where noise and/or heat reduction
are important design considerations.
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VFD a good choice?
• Pumping to an elevated water tank or water tower
• The suction supply comes from an adjacent ground level storage tank
• Pumps have very little extra pressure at shutoff
• The pump house is located in a remote area and is fan ventilated.
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VFD a good choice?• Pumping to the upper floors of a hotel• Cooling tower makeup and restaurant demands at the
top• Flow rates vary from low medium during the day but
remain consistently low overnight• The suction supply comes from a water main that is
known to have a very high static pressure at night• We can use vertical multi-stage pumps that are selected
to the right of center for higher efficiency at the expected flow rates. The pumps produce a lot of extra pressure at shutoff
• The pump system resides in the basement mechanical room, directly underneath the meeting rooms
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Sequencing Summary
Pump systems are controlled based on several methods, usually all running
concurrently.
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Power Consumed
• Set Point Units: • Advantages:• Disadvantages:• Most useful when:
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Pressure
• Set Point Units: • Advantages:• Disadvantages:• Most useful when:
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Maximum/Minimum VFD Speed
• Set Point Units: • Advantages:• Disadvantages:• Most useful when:
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Flow
• Set Point Units: • Advantages • Disadvantages:• Most useful when:
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Conclusion
• Find a partner that you trust to provide a design that meets your needs
OR• Confirm that some product can meet your
WHOLE specification and drawing
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Online Sizing Guide
• http://extranet.syncroflo.com/Sizing/step1.php
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Online Resources
• http://www.pumpsystemsmatter.org/• http://www.pmengineer.com/Articles/Cover
_Story/BNP_GUID_9-5-2006_A_10000000000000327145