Gas Turbine Flow Meters (LWGQ Series)
Velocity Pulse Meters for Dry Single-Phase Gas Service
Accuracy ±0.5 / 1.0 / 1.5 % of rate options
Pipe DN25 to DN300
T+P (temperature and pressure) compensation built-in
- Ex d II CT6 Gb (flameproof) and Ex ia II CT6 Ga (intrinsically safe) dual hazardous-area
- Aluminium, 304, 316L, and titanium body options across the family
- Built to GB/T 32201-2015 and JB/T9246-2016 family lineage
The LWGQ Series is the gas turbine family for clean dry single-phase gas service across natural gas, fuel gas, nitrogen, oxygen, compressed air, and post-upgrade biogas. Bore range runs DN25 to DN300 standard with DN350 and DN400 special build. Wet gas, condensate-bearing flow, raw biogas, cryogenic liquid service, and 2-phase service all sit out of range; see the When-to-specify table.
Gas Turbine Flow Meter models
Six LWGQ models on the gas turbine family. Each model below carries its own bore range, body material default, and scenario framing; pick the page that matches the gas medium and application.
Natural Gas Turbine
City-gas distribution custody billing with AGA-style fiscal tagging. T+P compensation, 1:30 turndown for off-peak draw.
View configuration →Compressed Air Turbine
Compressed-air audit, ISO 50001 sub-measurement, tenant billing. 3.6 V lithium battery option for off-grid AMR.
View configuration →Fuel Gas Turbine
Refinery, petrochem, and CHP fuel-gas billing. HART + RS-485 Modbus for DCS rollouts.
View configuration →Nitrogen Gas Turbine
Multi-tenant chemical-park N2 billing, semiconductor fab manifold sub-measurement, industrial-gas distributor delivery.
View configuration →Oxygen Gas Turbine
Medical-gas manifold, industrial-gas vendor delivery, steel-EAF and glass-furnace enrichment. Factory oil-free build; ASTM G93 / ISO 15001 cert buyer-arranged.
View configuration →Biogas Turbine
Post-upgrade biomethane / RNG (renewable natural gas) fiscal billing. Titanium body for residual H₂S tolerance.
View configuration →How LWGQ gas turbine meters work
Gas enters the meter through a dedicated integrated upstream flow conditioner that straightens and accelerates the velocity profile. The rotor blades sit at a fixed angle to the gas-flow direction; drag torque from the gas overcomes friction torque and rotor angular velocity becomes proportional to volumetric gas flow. A magnetic pickup downstream of the rotor reads pulses from a co-rotating signal wheel, and pulse frequency is proportional to volumetric flow through the calibrated K-factor stamped to each meter.
Temperature and pressure sensors feed the integrated flow computer alongside the pulse train. The microprocessor applies T+P compensation in real time, computes corrected mass flow and corrected volumetric flow at reference conditions, and outputs the result on the 4-20 mA loop, RS-485 Modbus link, HART signal, and the LCD readout. Daily and timed-interval logs preserve the audit trail. Rotor geometry, blade angle, and bearing strategy are tuned for gas density and the no-lubrication regime of dry gas service.
When to specify LWGQ gas turbine
Match the gas service against the table below. Out-of-range service goes to vortex, swirl, or Coriolis families.
| Service | Gas Turbine LWGQ | Alternative meter type |
|---|---|---|
| Clean dry natural gas, fuel gas, N2, O2, air, inert | Standard pick | — |
| Post-upgrade biomethane / RNG (dehydrated) | Standard pick (titanium body) | — |
| Wet gas with condensate carry-over | Out of range (rotor pulsation) | Swirl (LUXB) tolerates carry-over |
| Saturated or superheated steam | Out of range | Vortex (LUGB) for steam service |
| Cryogenic LN2 / LOX / liquid biomethane | Out of range (gas-only family) | Coriolis (ZLMFM) for cryogenic liquid |
| Raw biogas with H₂S and moisture upstream of scrub | Out of range (wet) | Swirl (LUXB) tolerates wet biogas |
| 2-phase gas + liquid service | Out of range entirely | Coriolis (ZLMFM) for 2-phase |
Application-to-build map.
LWGQ Series application coverage by gas service. Body material, hazardous-area certification, and output strategy vary by model. All six models below ship in 5–7 business days.
| Service | Body / Hazardous / Output | Model page |
|---|---|---|
| City-gas distribution custody billing, fuel-gas to boilers, CHP feed | Aluminium or 304 body, Ex d + Ex ia, T+P, pulse + 4-20 mA + HART + GPRS / 4G | Natural Gas Turbine |
| Compressed-air audit, ISO 50001 sub-measurement, tenant billing | Aluminium body, RS-485 Modbus, 3.6 V lithium battery AMR option | Compressed Air Turbine |
| Refinery / petrochem / CHP fuel-gas billing | 316L body, ANSI 600LB, Ex d, HART + RS-485 Modbus for DCS | Fuel Gas Turbine |
| Chemical-park / fab manifold / industrial-gas N2 delivery | 304 body, Ex d + Ex ia dual, T+P, pulse + 4-20 mA | Nitrogen Gas Turbine |
| Medical-gas / industrial-gas O₂ delivery / furnace enrichment | Oil-free 316L body, Ex d, buyer-arranged ASTM G93 / ISO 15001 | Oxygen Gas Turbine |
| Post-upgrade biomethane / RNG fiscal billing | Titanium body, Ex d, T+P custody compensation | Biogas Turbine |
All LWGQ models share ±0.5 / 1.0 / 1.5 % of rate accuracy options, 1:10 to 1:30 turndown, GB/T 32201-2015 and JB/T9246-2016 family lineage, IP65 / IP66 ingress, EMC 2014/30/EU, and 5–7 business day lead time. Specify body material, pressure class (1.6 to 10 MPa metric or ANSI 150 to 600 LB), and output (pulse, 4-20 mA, RS-485, HART, GPRS / 4G) at quote.
Universal LWGQ install requirements
Install rules across all six LWGQ models. Model-specific notes (oxygen oil-free hand-off, titanium body sour-gas handling) live on each model page.
- Install a gas filter upstream of the meter Debris, scale, and pipe-mill iron filings damage the rotor blades and shift the K-factor. Stage the filter at least one pipe run upstream of the meter inlet; never bolt a filter directly onto the meter flange. Add an oil filter on dirtier service or compressor-discharge ducts.
- Horizontal install only; vertical orientation not permitted The rotor and bearing are sized for horizontal flow. Vertical install distorts the bearing load path and biases the K-factor. Flow direction arrow on the housing must align with line flow.
- Keep 3D upstream and 1D downstream per the integrated flow conditioner The integrated upstream flow conditioner cuts the required straight pipe to 3D upstream and 1D downstream of the meter. Throttling valves and control valves go upstream of the 3D run, never immediately upstream of the meter inlet.
- Install isolation valves upstream and downstream plus a bypass loop Slow-closing ball valves at both meter flanges and a bypass leg with isolation valve let the operator pull the meter for inspection without interrupting downstream service. The bypass valve stays closed during normal billing service.
- Earth-ground the meter separate from the welding system External-power builds need reliable earth grounding for accurate pulse capture, but the meter ground must not share with high-voltage systems. During pipe installation or maintenance never bond welding-system ground to the meter ground; transient current burns the pickup electronics.
Frequently asked questions
Need help sizing an LWGQ build?
Send line size, gas composition, dryness, and target flow. Engineering returns a sized model code within one business day. Lead time 5–7 business days.