1. FlexfloTM Surge Relievers
Fast, Reliable Protection

2. Transient Pressure Surge vs. Overpressure Condition
Pressure steadily and evenly builds in the pipeline.
Pressure over time may exceed pipeline rating.

3. Transient Pressure Surge vs. Overpressure Condition
Causes include:
Pumps steadily building head
Centrifugal pumps are shut down but impeller continues to spin
Malfunctioning upstream pressure regulators

4. Transient Pressure Surge vs. Overpressure Condition
Can be mitigated by:
Relief valves
Back pressure regulators

5. Transient Pressure Surge vs. Overpressure Condition
Rapidly developing change in pressure of liquids.
Pressure oscillates as wave moves through pipeline
Requires fast relief

6. Transient Pressure Surge vs. Overpressure Condition
Causes include:
Pump start-up
Pump trip (e.g. due to electrical failure)
Changes in control valve position (intentional or not)

7. Transient Pressure Surge vs. Overpressure Condition
Causes include:
Check valves actuating
Emergency shut-down valves (ESD)
Sudden variation in demand

8. Surge Sources
Valves closures Pump start / shutdown Emergency Shutdown Valves (ESD) Check valves actuating Sudden demand variation

9. 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

10. Applications Storage Tank Farm Desalination
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

11. Applications Transmission Refineries
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

12. Applications Airports Loading/ Unloading Terminals
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

13. Additional Applications
Water transportation
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

14. Portfolio Model 900TE 2” – 6” Top Entry Model 83 1” – 6”
Stainless Steel
Model 80
4” – 12”
Can be pilot operated
Model 887
4” – 12”
Modified for speed

15. Flexflo Principle of Operation
All Flexflo valves consist of certain common elements:
Flexible rubber tube
Metal core
Housed inside body

16. Flexflo Core
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.

17. Flexflo Jacket
Jacket (space between tube and body or liner) is filled with pressurized fluid.

18. 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.

19. 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.

20. Flexflo Principle of Operation
Surge event passes: Pipeline pressure returns to normal. Jacket pressure reseats tube against core. Valve closes.

21. Flexflo Model 900TE Regulator
Applications:
Oil, gas and water pressure control
Pressure reducing and backpressure control
Surge relief
On-off service
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
Key design feature
Top Entry
Sizes
2 – 6 in.
Max differential
1200 psid
Max Inlet/ Outlet
1480 psig
Temperature
-29 to +66 C

22. Flexflo Model 83 Regulator
Applications:
Oil, gas, and water pressure control
Corrosive service
Surge relief
On-off service
Benefits:
No hydraulic oil or internal springs required
Reduced capacity trims
Low noise
Ideal regulator when space is limited
Key design feature
Stainless steel construction
Sizes
1 – 6 in.
Max differential
1200 psid
Max Inlet/ Outlet
1480 psig
Temperature
-29 to +66 C

23. Flexflo Model 80 Regulator
Applications:
Oil and water pressure control
Surge relief
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

24. 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

25. 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)