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Flexflo Considerations and Sizing. Flexflo Considerations. Highlights: -Simple, reliable operation: One moving part -Nitrogen loaded valves Flexflo valves have the fastest response time -Valves reseat completely, and can reduce chatter. Limitations - PowerPoint PPT Presentation
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Flexflo Considerations and Sizing
Flexflo Considerations
• Highlights:-Simple, reliable operation: One moving part-Nitrogen loaded valves Flexflo valves have the fastest response time-Valves reseat completely, and can reduce chatter
• Limitations-Lower flowrates for nominal pipe sizes-Higher initial investment cost in many applications-Individual elastomers each have unique characteristics and limitations
Loading Options
• Pilot Loaded:-Standalone performance: Loading pressure sourced from flowing medium-Slow response time with liquid applications
• Nitrogen Loaded-Loading with Nitrogen or other inert gas has allows for fast response time, even with liquid service-Overall total flow restricted: jacket pressure does not decrease
Loading Options (continued)
• Panel Loaded:-Using a panel to nitrogen load the jacket pressure allows for the benefits of gas loading, add additional features, and addresses the limitations of a loading block -Capacity Boosting properties by venting the jacket pressure
• Panel Options:-Vent jacket pressure to allow full open valve-Additional gauges to provide information to operators about process pressure, nitrogen pressure(s), valve state, etc.-Test ports and alarms
Sizing
Capacity Table:-Capacity table looks different than most-Cv is replaced by the Maximum Flow Factor, essentially the maximum Cv value at full open-Addition Performance Curve Slope (Cs) term describes performance at less than full open
Sizing Equation
• Traditional Sizing Equation:
Q: Flowrate in GPMCv: Valve CoeffecientKq: Viscosity Correction FactorP: Pressure in psiS.G. : Specific Gravity
• Flexflo Sizing Equation:
Ff: Flow Factor
%OP: Percent Over Pressure
0 50 100 150 200 250 300 350 400 4500
5000
10000
15000
20000
25000
30000
35000
Comparing Pilot Loading and Nitrogen Block Loading
Upstream Pressure
Flow
in G
PM
Example Configuration:-12” Model 887-150 psi Set Point-50 psi Back Pressure
0 50 100 150 200 250 300 350 400 4500
5000
10000
15000
20000
25000
30000
35000
Comparing Pilot Loading and Nitrogen Block Loading with Viscous Flow
Upstream Pressure
Flow
in G
PM
Example Configuration:-12” Model 887-150 psi Set Point-50 psi Back Pressure
Viscous Example:-Representative of Heavy Crude Oil
0 50 100 150 200 250 300 350 400 4500
5000
10000
15000
20000
25000
Comparing Pilot Loading , Nitrogen Block Loading, Panel Loading with Viscous Flow
Upstream Pressure
Flow
in G
PM
Example Configuration:-12” Model 887-150 psi Set Point-50 psi Back Pressure-Representative of Heavy Crude Oil-Capacity Boosting PanelSet to Vent @ 200 psi
Budgetary Pricing
• Valves:• 2”-6” 900 TE Top Entry Valves-$2,500 - $10,000• 1”-6” Model 83 Valves-$1,500 - $9,000• 4”-12” Model 887 Surge Reliever-$20,000 - $200,00012” Model 887 150# : $105,000
• Loading Options:• Loading Block-$500-$2000• Pilot Loading-$1000-$2000• Panel Loaded -$5,000-$20,000
Q+A
Contact:Rob BarchardBarchard [email protected]
If you would like to receive information about upcoming presentations directly from GE, please send me an email or write down your contact information on the list up front.