Flexflo TM Surge Relievers Fast, Reliable Protection
Dec 31, 2015
FlexfloTM Surge RelieversFast, Reliable Protection
2 GE Title or job number
04/19/2023
Transient Pressure Surge vs. Overpressure Condition
Overpressure condition:
• Pressure steadily and evenly builds in the pipeline.
• Pressure over time may exceed pipeline rating.
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Transient Pressure Surge vs. Overpressure Condition
Overpressure condition:• Causes include:• Pumps steadily
building head• Centrifugal pumps are
shut down but impeller continues to spin
• Malfunctioning upstream pressure regulators
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Transient Pressure Surge vs. Overpressure Condition
Overpressure condition:
• Can be mitigated by:• Relief valves• Back pressure
regulators
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Transient Pressure Surge vs. Overpressure Condition
Transient Pressure Surge:• Rapidly developing
change in pressure of liquids.
• Pressure oscillates as wave moves through pipeline
• Requires fast relief
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04/19/2023
Transient Pressure Surge vs. Overpressure Condition
Transient Pressure Surge:• Causes include:• Pump start-up• Pump trip (e.g.
due to electrical failure)
• Changes in control valve position (intentional or not)
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04/19/2023
Transient Pressure Surge vs. Overpressure Condition
Transient Pressure Surge:• Causes include:• Check valves
actuating• Emergency shut-
down valves (ESD)
• Sudden variation in demand
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Surge Sources
Valves closures
Pump start / shutdown
Emergency Shutdown Valves (ESD)
Check valves actuating
Sudden demand variation
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Applications
Anywhere there is a valve that can close, a pump that can malfunction, or an ESD that can engage, you have a potential surge
Companies who are moving, storing, refining, and producing liquids may be at risk of damage caused by surges
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Applications
Storage Tank Farm• As fluid is being pumped in and
out of storage tanks, both the pumps and the valves represent surge potential.
Desalination• Surge Relievers protect
equipment from water hammer during the desalination process
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Applications
Transmission• At various stages of liquid
transmission, surges can occur• This includes pump stations,
custody transfer stations, and near ESDs
Refineries• Surge potential exists before and
after liquids are refined, typically at receiving, storing, or distribution
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Applications
Airports• Jet fuel storage and transportation
through an airport is a potential surge hazard
Loading/ Unloading Terminals• Often near bodies of water, surge
protection is extremely critical to prevent pipeline breaks at these terminals that load and unload large vessels
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Additional Applications
Water transportati
on
Processing plant Power plants Mining
Coal slurry FPSO Offshore platforms
Redistribution of water
Distillation towers
Petrochemical feed stock
Corn oil storage
Deep mine pumping
River crossings
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04/19/2023
Portfolio
Model 900TE2” – 6”
Top Entry
Model 831” – 6”
Stainless Steel
Model 804” – 12”
Can be pilot operated
Model 8874” – 12”
Modified for speed
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Flexflo Principle of Operation
All Flexflo valves consist of certain common elements:• Flexible rubber tube• Metal core• Housed inside body
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Central barrier separates inlet and outlet cavities.
Slots allow fluid to flow around barrier when valve is open.
Tube stretches around core, sealing the passage between inlet and outlet.
Flexflo Core
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Flexflo Jacket
Jacket (space between tube and body or liner) is filled with pressurized fluid.
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Flexflo Principle of Operation
Normal operation:Pipeline pressure is less than jacket pressure plus cracking pressure.Jacket pressure forces tube against core.Valve is closed.
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Flexflo Principle of Operation
Valve set point is reached:Pipeline pressure exceeds jacket.Tube is forced away from core.Fluid flows around barrier into downstream line.
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Flexflo Principle of Operation
Surge event passes:Pipeline pressure returns to normal.Jacket pressure reseats tube against core.Valve closes.
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Applications:• Oil, gas and water pressure
control • Pressure reducing and
backpressure control• Surge relief• On-off service
Key design feature
Top Entry
Sizes 2 – 6 in.
Max differential 1200 psid
Max Inlet/ Outlet 1480 psig
Temperature -29 to +66 C
Flexflo Model 900TE Regulator
Benefits:• Low noise• Rugged top entry design ideal
for demanding pipeline applications
• Easy in-line maintenance • Accessibility without removal
of pilot or plumbing• No hydraulic oil or internal
springs required
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Applications:• Oil, gas, and water
pressure control• Corrosive service• Surge relief• On-off service
Key design feature
Stainless steel construction
Sizes 1 – 6 in.
Max differential 1200 psid
Max Inlet/ Outlet 1480 psig
Temperature -29 to +66 C
Flexflo Model 83 Regulator
Benefits:• No hydraulic oil or internal
springs required• Reduced capacity trims• Low noise• Ideal regulator when space is
limited
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Applications:• Oil and water
pressure control• Surge relief
Flexflo Model 80 Regulator
Benefits:• Pilot-operated or Nitrogen-
loaded (with separate plenum)
• Core optimized for liquid service
• Line-removable design (flanges remain in line)
Sizes 4 – 12 in.
Max differential 1200 psid
Max Inlet/ Outlet 1480 psig
Temperature -29 to +66 C
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Flexflo Model 887 Liquid Surge Reliever
Sample Applications:
• Tank farms
• FPSOs
• Liquid loading/offloading terminals
• Desalination plants
• Offshore platforms
• Oil boosting station
Benefits• Exceptionally fast-acting• Bubble-tight seal• Easy to maintain• Simple, reliable design• Extremely durable
Sizes 4 – 12 in.
Max differential 1200 psid
Max Inlet/ Outlet 1480 psig
Temperature -29 to +66 C
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04/19/2023
Loading Options
• Pilot-Operated Systems
• Gas-Loading Systems• Loading Block• Control Panel (CP1)
• Capacity-Boosting Systems• Capacity-Boosting Panel
(CB)• Capacity-Boosting, Alarm,
and Test Panel (CBAT)