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Twin Anti surge system
- 1. Twin Antisurge System WWW.FDS-VALVE.COM Invented,tested , made and licensed in USA High-integrity pressure protection system TA -1020
- 2. Design Features Twin antisurgeprotection system WWW.FDS-VALVE.COM 1-1 The simple anti surge protec- tion system includes Hot cycle valve and cool cycle valve and each has one valve with two surge relief plugs and one pilot with two shutters to release over pressure by sensing and tracking at about speed of 100- 150 millisecond without over shoot or undershoot , it is the fastest , the most efficient and reliably protection system in the world . The simple system was de- veloped to fully integrate all parts as one with a compressor seamlessly and overcome shorting comings of conventional Anti surge valves in term of reliability , speed and efficien- cy , it has three 21 first century breakthrough technologies (1) self sensing/tracking mechanism through Gas vs Gas , pressure vs pressure without conversion (2) High reliability through a system integration with 2 redundancies , 1 moving part for each unit (3) volume control in stead of area control Pressure Class 150-900 Pipe Size 2”-24” Temperature -450 F to 500 F Leakage Class : V- VI Fluid type : Gas or Gas/liquid Operation speed 100 -150 millisecond Operation type: Sensing/ tracking Redundancy 2 External power Not required Controller Not required Turning /programing Not required Actuator Not Required Fugitive emission No Thermal chamber FDS integral Surge Control Conventional Compressor Surge Control Two normal closed independent ,fail-open plugs Compressor per- formance map FDS Antisurge line Other Antisurge line Inlet gas Inlet Gas Pilot Regulated Gas Outlet relief gas
- 3. Ideal gasequation is a foundation for the gas releas- ing mechanism includes three factors, Temperature , volume and pressure , PV= n RT, the pre set pressure is very im- portant for the relief function and must be kept the same all time. Pressure based on Gas nanostructure is defined as interacting forces among mole- cules, the researches indicate that the rate of the forces change is about 50 to 100 millisecond ,so in order to sense and track the pressure , the best method is to use the same type of gas or light gas . Volume control is the faster relief method than that of temperature and better than that of area control in term of efficiency and minimizing cavitation and erosion . Set pressure is defined by internal gas in plug is to sense pressure of incoming fluid pressure , since the gas is compressible as the Pi pres- sure increase and over the set pressure and would push the plug to open position, while as the Pi reduce below set pres- sure , the plug would move back smoothly . FDS Surge control is based on the gas interacting forces, at change rate of 50– 100 milli- second, it is the fastest and most reliably over all surge control methods over 100 years without pre-stroke delay or hysteresis Design Features Integral Gas releasing Mechanism (1) 1-2 Internal gas pressure as a set pressure Ps The governing equation Offset angle 68 F Disc Body Relief Pilot Thermal chamber Inlet fluid gas or liquid P1 Pressurized Gas port Surge Point Set Pressure Surge control map Hot bypass cycle valve
- 4. The Newtownlaw is foundation for the plug movement , F = a *M , t= M *(V2-V1) /F , V1= 0, t = M*V2 /F , by reducing M and increasing F , the response time would re- duce and two intel flows would cancel out reaction forces . it combined the sensing/track, as one, it has two benefits , speech and simple structure The plug constantly sense and track the pres- sures between incoming flow pressure and set pres- sure by moving the plugs back and forth . Gas accumulator is a redundant device to stabi- lize internal pressure ,since the gas is compressible after the plug move in- ward , the Gas accumula- tor is designed to stabilize pressure by restoring or to releasing the internal gas Relief pilot is used as a redundant device to re- lease overpressure of in- ternal gas internally if the gas supply is constantly provided , the spring against the shutter and internal pressure , the shutter would move back and forth Thermal chamber is de- signed to regulate pressure by using liquid or heater to change the temperature like subsea or day and night temperature change . Design Features Integral Gas releasing Mechanism (2) 1-3 Regulated gas as a set pres- sure Ps Pre set Spring against Gas pressure thermal increase Offset angle Relief pilot 68 F Regulated gas from compressor Disc Body Relief Pilot Thermal chamber to regulate the temperature Plugs move to release Pilot inlet connect to regu- lated gas source and accu- mulator Gas Accumulator Regulated gas port Flow direction Plugs move to close Hot bypass cycle valve
- 5. Cool bypasscycle valve is different from hot bypass cycle valve in term of speed and function but they com- pliment with each other and solve complex surge problems for multi- ple stage compressors . It operates much slow at 1 to 3 second and control the flow rate as planed unlike hot bypass valve is used as unplanted Twin plug control ( volume control) is used for very complex control process no other single control valve can do , it includes a hard control and soft control , the hard control is slow and well matched with conventional controller and method , the soft control is still fast but small change as a preprocess into the outlet , such process would create most efficient process with lower cost and high reliability. Sealing technologies break the temperate, operation speed and sealability ground no other can match today include ID/OD sealing mechanism , buckling seal rings and composite seat , which are the foundation for new challenges Design FeaturesWWW.FDS-VALVE.COM 1-4 Port A Plug Hard control with less frequency and big change Antisurge cool cycle valve and Seat profiles Soft control with high frequency and small change Top plate Rotary Stem Inlet Outlet Plug as a control valve by conventional method or se- quential control Outlet plug Inlet plug as regulator Fluid link port Pilot for inlet plug Pilot for outlet Plug control pilot PTFE wedge ring for closing within 150 to 350 millisec- ond under temperature –450 to 500 Composite wedge ring for closing within 150 to 350 millisecond under –450 to 1100 Fully metal buckling ring for closing within 150 to 350 mil- lisecond under temperature - 450 to 1500 F Flow direction Pilot for inlet plug Outside control Cool bypass cycle valve
- 6. FDS SurgeProtection System is based on science achievement and the modem digital design process Disrupt innovations as following Reliability (1) Redundancy 2 (2) mini- mizing components . Each function unit has one moving part Gas releasing mechanism is the first control method based on nanostructure theory and thermodynamics . , gas v gas and pressure v. pressure .it fully re- solves gas thermal issues The fastest operation speed is achieved by fully integrating all parts seamlessly and frictionless and well designed based on Newtown three laws and Fluid dynamics analysis and material science Seat sealing performance , the compo- site and Buckling seats break new ground any metal or nonmetal ever could reach in term of operation temperature and speed based on the energy conservation law . Volume Control . This is the first flow control method in flow control history since 1797 , Mr. Venturi discovered the area control method, the volume Control eliminate or minimize the cavitation and erosion and simplify two phase analysis and , the twin plug control is one of the applications Design Features Disrupt innovation - By Sound science / robust Design WWW.FDS-VALVE.COM 1-5 Digital design 3 D Modules Digital twin- validation data acquisition Robust Design Process Digital verification simulation Science library
- 7. WWW.FDS-VALVE.COM 2-1Selection FDS SurgeProtection system applications Pipeline surge protection LNG Process protection Compressor surge protection Offshore Platform Chemical plant
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- 10. WWW.FDS-VALVE.COM Selection 2-4 Hotbypass valve general information
- 11. WWW.FDS-VALVE.COM Selection 2-5 Coolbypass general information
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