FlexfloTM Surge RelieversFast, Reliable Protection

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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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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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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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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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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)