Download - Technical surge Session
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Technical surge Session
Hydraulic Transient and Surge Protection Devices
Gwenn A. PHALEMPIN
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What Causes Pressure Surges?
Rapid Change in flow rate caused by:Valves (Opening, closing)Pumps (Start-up, stop, power failure)Check Valve (Slamming)Air/Vac Combinations (Air slam)
WORST CASE ANALYSED: Power Failure at Max Flow
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What happens when a valve shuts off?
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What happens when a pump starts?
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What happens when a pump stops?
High Pressure
Low Pressure
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What happens when a pump stops or a valve closes rapidly?
UPSREAM:Pressure rises
DOWNSTREAMPressure dropsWater Column Separation
CAVITATION: (Vapor pocket created: -14.5 psi)Flow reverses => water column rejoins.Vapor pocket collapse, high pressure spikes.
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Pump trip
Formation of vapor cavity
Growth of vapor cavity
Flow reversal
Steady state
Vapor cavity collapses
BangPressure Spike
Events following a pump trip
Pump trips
---Water pumped to tank
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Pump trip - check valve
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Surge pressures caused by a pump trip
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Damaged valve at pump station
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Two Types of Cavitation…
1 - Dynamic Cavitation: On pump impeller
2 – Transient Cavitation: Inside pipes
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Dynamic Cavitation – Negative pressure on pump impeller
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Vapor pocket collapse effects on pump impellers
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If cavitation destroys pump impellers…
What does cavitation do to pipes?
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Cavitation inside pipes
Vapor pocket collapses – HIGH PRESSURE
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Cavitation inside pipes
Vapor Pocket CollapseErosionFatiguePipe Wall Becomes thinnerPipe break
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Pipe lining damaged by negative pressures
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Pipe collapse
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Costly repairs…
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In summary, Pressure Waves…
Origin: Rapid variation of flow velocity
Pressure waves propagate in the systemVelocities up to 4500 fps
Velocity depends on pipe material/diameter/thickness
High points in the system are more at riskMost likely to reach cavitation at high pointWater column separation
Pressure waves are reflected at the ends of the system
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Storage tankSame magnitude – opposite sign
Dead EndSame magnitude – same sign
PRESSURE DOUBLES!!
Local head lossPart reflected back – same signPart keeps going – same sign
WAVE REFLECTION
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Software animation of pressure waves
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How to reduce water hammer?
Flywheel
Vacuum/air release valve combinations
Surge anticipation valve
Variable Frequency Drive (VFD)
Stand pipe
Bypass check valve
Surge vessel
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Flywheel
Increase rotating inertia of the pump with a flywheel
Increases energy requirements
Can’t be used on submersible pumps
Accurate balance of the wheel
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Vacuum Breaker
May be required as little as every 500ft
Require high maintenance
Reaction time (delay to fully open)
Large volume of air admitted in the pipe
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Surge anticipation valve
Surge anticipation valveGood to relieve high pressure Ineffective against low pressure
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Variable Frequency Drive (VFD)
Great for normal operationControlled pump startupControlled pump shutdown
Ineffective during power failure
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Stand Pipe
Large structureNeeds to be taller than the maximum headExpensive solution
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Stand Pipe
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Bypass check valve
Needs positive pressure upstream to provide energy
Simple for overcoming negative pressures
Does not provide protection for positive pressures
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Surge vessel
•Advantages: Energy Free
Give and receive energy Low maintenance
NEEDS TO BE SIZED PROPERLY with
computer software
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Information required to do a surge analysis
Existing Hydraulic ModelEPAnet file export => KYpipe
Hydraulic Information About the SystemDetailed profile of the pipeMaximum and Minimum allowed pressuresMaximum Flow RatePipe characteristics (diameter/material)
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Welded Steel Pipe
Allowed negative pressure
-10.0 psig
Speed of pressure waves
1600 fps
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Concrete
Allowed negative pressure
0 to -10.0 psig (depending on seals technology)
Speed of pressure waves
1800 fps
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Pre-Stressed Concrete
Allowed Negative Pressure: 0 psig
Speed of pressure wave: 1800 fps
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HDPE – Thermo-Welded
Allowed negative pressure
-10.0 psig
Speed of pressure waves
800 fps
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PVC Pipe
Allowed negative pressure
0 to -3.0 psig
Speed of pressure waves
700 fps
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Ductile Iron Pipe
Allowed negative pressure
-6.0 psig
Speed of pressure waves
4500 fps
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KYpipe model of potable water distribution system
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KYpipe model of potable water distribution system
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KYpipe model of Waste Water system
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Sizing a surge tank with KYPIPE
Model will help determine the required surge tank’s…VolumeDesign pressureOutlet diameterPrecharge pressure
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Surge pressures resulting from a pump trip – with and without surge tank
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HYDROPNEUMATIC VESSELS
SURGE PROTECTION PRESSURE REGULATIONPUMP CYCLE CONTROL
COMPRESSOR TYPE
OR
BLADDER TYPE
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COMPRESSOR VESSELSAchieve their balance through a complicated system of controls.
- Air Receivers- Solenoid valves- Measuring Probes- Compressor- Control Panel
All these require constant maintenance, otherwise the system is not protected against water hammer.
The permanent dissolution of air into the water will eventually reappear elsewhere in the system. $$$$$$$$$$$$$$$$$$
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BLADDER VESSELSHydraulically work the same as
compressor tanks.
The major differences are…
- Precharge air is permanently contained within the vessel.
- Air doesn’t dissolve in the liquid
NO NEED FOR COMPRESSOR
STAND ALONE SYSTEM
LOW MAINTENANCE
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- Liquid contained within a rubber bladder.
- Bladder acts as a barrier between the gas and the liquid
- Predetermined precharge (air or nitrogen) is trapped between the shell and the bladder.
- Anti-extrusion grid
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In waste water the bladder is inverted and connected to the top of the vessel. The precharge is contained inside the bladder. By allowing the sewage to be contained inside the vessel and only using vertical configurations one can control the problems of sedimentation.
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Vertical only due to sedimentation
Head Losses and sedimentation build up are calculated in outlet design
Tee, 90 degree and bottom outlets
Range: 50 to 15,000 gallons.
10 to 15 year life expectancy for bladders.
Warranty directly related to Charlatte’s involvement in sizing vessel.
Load Cell monitoring
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When it is possible a good solution is to use external atmospheric energy and feed the system with atmospheric air, using limitless amounts of free energy. This job is perfectly achieved by the A.R.A.A. vessel, without any air bubbles being introduced into the pipe work.
As these flat profiles are frequent in sewage systems, the design of the device is adapted to raw water and effluents. They have been successfully used for over ten years from 50 gallons up to 25,000 gallons.
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MANUFACTURING
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Surge tank not properly welded
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CHARLATTE - Not Charlatte
Tank Leg Design
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COATING AND TESTING BLADDERS
EUV WASTE WATERBLADDER
POTABLE WATER BLADDER
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Hydrochoc 30,000 gallon potable bladder surge vessel Chicago
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Anti-extrusion grid and bladder clamping system
Outlets 8” dia. and above
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BLADDER TYPE VESSELS
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4 x 25,000 gallons
Clear Water Bladder Tanks
150 psi design pressure
10’ dia. X 55’ Length
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SURGE VESSELS IN SERVICE
CITY OF FAIRVIEW OREGON.2x528 GALLON WASTE
WATER BLADDER SURGE VESSELS.
TAZEWELL COUNTY PSATAZEWELL COUNTY, VIRGINIA.
2x400 GALLONPOTABLE WATER BLADDER VESSELS.
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VERTICAL 3x18,000 GAL
2x20,000 GALLON BLADDER SURGE VESSELS.
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2 Hydrochoc 10,000 gallon 250 psi bladder type surge vessels Ontario Canada.
Hydrochoc 22,500 gallon 150 psi bladder type surge vessels Omaha Nebraska.
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1,050 gallons Hydrofort Vessel in Kuai, Hawaii
-Pump Cycle control tank.-Magnetic Level Gauge controls the pumps.
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LEVEL MONITORING SYSTEM
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LEVEL MONITORING SYSTEM
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EUV 3x10,000 gallon 450psi Raw water inverted bladder surge vessels
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Hydrofort 7925 gallon bladder type hydro vessel Florida
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EUV 2641 gallon inverted bladder for wastewater Georgia.
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8 x 26,500 gallons compressor tanks – Abu Dhabi
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