Innovations for Improved LFG Collection

Jason MacKenzie, Project Manager

NW Regional SWANA SymposiumTroutdale, Oregon

April 30, 2015

• Engineering & Design– Gas Collection Systems– Biogas Cleanup – Biogas-to-Energy Facilities– High BTU Facilities

• Construction Management & Oversight• Facility Operations• Controls (SCADA) Integrator• Innovative Products

GCCS Innovation

• Innovation because of interest in improved LFG collection– Compliance & Odor– Power Generation– High BTU

OVERVIEW

• LFG Wellhead Control Valves• LFG Wellhead Flow Meters• LFG Well Casing Centralizers• LFG Well Casing Re-Perforation

CONTROL VALVE CONSIDERATIONS

• Fine tune adjustability• Rising stem and graduation marks• Ability to pass liquids and debris in LFG• Pressure drop at 100% open

FINE TUNE ADJUSTABILITY

• Ability to apply each well’s optimum vacuum– Shape of characteristic curve– Ability to move in small increments along the

curve

VALVE CHARACTERISTICS

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FLO

W

VALVE POSITION

2" Polygate 2" Exact Flo 2" Precision Fine Tune 2" Spears Gate Valve

VALVE CHARACTERISTICS

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10%

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0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

FLO

W

VALVE POSITION

2" Polygate 2" Exact Flo 2" Precision Fine Tune 2" Spears Gate Valve

QED $255Landtec$230

PolyGate$160

PVC Gate$65

Spears Y-Globe $205

RISING STEM AND GRADUATION MARKS

• Nice to have, but worth the cost?• Benefits

– Visible indication of valve position– Useful for remote data analysis– Reference point for re-set after temporary shut-off

PRESSURE DROP AT FULL OPEN

• Change in Flow Direction• Constriction• Edges to Cause Turbulence

SPEARS GATE VALVE

• Adequate Adjustability• Non-Rising Stem, 11 rotations• Economical

SPEARS GATE VALVE

SPEARS Y-BODY GLOBE VALVE

• Good Adjustability• Rising Stem, 6.5 Rotations• Graduation mark decal available

SPEARS Y-BODY GLOBE VALVE

LANDTEC E-FLO VALVE

• Conical Y-Body Globe Valve• Good Adjustability• Designed for LFG• Rising Stem, 23 turns• Graduation Marks

QED PRECISION FINE TUNE CONTROL VALVE

• Angle Globe Valve• Very Good Adjustability

– Slits for low flow performance

• Designed for LFG• Rising Stem, 10 Rotations• Graduation Marks

POLYGATE VALVE

• HDPE Construction• Un-obstructed Liquid Passage • Designed for LFG• Good Adjustability• Rising Stem

– 8 Rotations (2”)– 12 Rotations (3”)

2” Control Valve Summary

Valve Price Adjustability Rising Stem GraduationMarks

Spears PVC Gate $65 Adequate No No

PolyGate® $160 Good Yes No

Spears Y-Body $205 Good Yes Yes*

Landtec E-FLO $230 Good Yes Yes

Precision Fine Tune ™ $255 Very Good Yes Yes

Yes* = Graduation mark decal available

3” Control Valve Summary

Valve Price Adjustability Rising Stem GraduationMarks

Spears PVC Gate $355 Adequate No No

PolyGate® $365 Good Yes No

Precision Fine Tune ™ $425 Very Good Yes Yes

Spears Y-Body $475 Good Yes Yes*

Yes* = Graduation mark decal available

FLOW METERS

• Categories for Flow Meter Technologies– Pitot Tube– Orifice Plate– Flo-Wing Meter (Venturi)– Thermal Mass (Calorimetric)

PITOT TUBE

PHighPLow

PITOT TUBE

• Advantages– Accurate when sized correctly– Low vacuum loss

• Dis-Advantages– Impacted by water droplets and debris– Not accurate at low flows because of low DP– Reduced wellhead size recommended for lower

flow rates

ORIFICE PLATE

PHigh PLow

ORIFICE PLATE

• Advantages– Accurate when sized correctly– Interchangeable plates to accommodate low flows

• Dis-Advantages– Impacted by turbulence and liquids near

monitoring ports– Liquids accumulate and/or freeze on the plate– Narrow measurement range per insert– High DP = high vacuum loss

FLO-WING METER (VENTURI)

PHigh PLow

FLO-WING METER (VENTURI)

• Advantages– Wide flow measurement range– Unobstructed liquid passage– Accurate and repeatable measurement– Contoured to minimize downstream loss

• Dis-Advantages– Smaller wellhead needed for wells at very low

flow rates (<3 scfm)

THERMAL MASS (CALORIMETRIC)

• Heat dissipation corresponds to flow rate TempHeatedTemp

TempHeatedTemp

THERMAL MASS (CALORIMETRIC)

• Advantages– Less cost per wellhead– Low pressure loss

• Dis-Advantages– More equipment to carry during tuning– Impacted by water on heated probe

WELL CASING CENTRALIZERS

WELL CASING CENTRALIZERS

• Recommended 20’ Vertical Spacing– Maintains clearance from waste during installation– Straightens casing to support down-well pumps

and re-perforation equipment– Two-part model from ISCO reduces cost by

maximizing shipping density

WELL RE-PERFORATION APPLICATIONS

• Re-Perforation Applications– Insufficient perforation coverage– Plugged perforations– Non-perforated risers

THE TERMITE

• Compact & automated system• Field-replaceable ½” drill bits• Drills 6” and 8” plastic casings• DC motor housing purged and

pressurized with inert gas

THE TERMITE

• Restore existing LFG wells

Thank You

• For providing information and materials for use in this presentation

HAVE QUESTIONS? WE HAVE ANSWERS.

Ph: 541.549.8766 | Fx: 541.549.190115820 Barclay Drive | Sisters, OR 97759

www.ENERGYneeringSolutions.com