VEMMTEC IGTM Gas Turbine Meter Sizes, Flow Rate and Flanges The available nominal diameter of the IGTM gas turbine meter ranges from 50 mm ( 2" ) to 400 mm ( 16" ) . Other sizes are available on request. The IGTM can be delivered with G rates ranging from G40 to G4000, which means that IGTMs are available for flow rates from 10 m3/ h to 10 000 m3/ h. The relationship between G value and flow rate for each diameter is shown in table 3 on the last page of this brochure. Carbon steel or stainless steel IGTMs can be manufactured either with ANSI flanges or with DIN flanges in the ranges: ANSI 150RF - ANSI 600RF PN 10 - PN 100 Ductile Iron ( EN-GJS-400-18-LT; GGG 40) meter bodies are available in diameters from 50 mm ( 2" ) to 200 mm ( 8" ) and pressure class PN10 - PN16 and ANSI 125RF - ANSI 150RF. Accuracy Standard accuracy limits for CT-models are in accordance with the EC directives and many foreign regulations: ± 1% for 0.2 Qmax to Qmax ± 2% for Qmin to 0.2 Qmax As an option for the CT model the accuracy limits can be improved to: ± 0.5% for 0.2 Qmax to Qmax ± 1% for Qmin to 0.2 Qmax These limits are valid for the meter performance in ambient air. Usually, the performance is better at high-pressure applications. On request we can offer meters according to your accuracy specification. The repeatability of the vemm tec IGTM is better than 0.1% Approvals The IGTM is specifically designed in accordance with all relevant and published standards, like EC directives, EN 12261, AGA 7, ISO 9951, OIML R6, R32, and R137-1. Many national standards and laws are based on the above. The IGTM-CT meter is approved for custody transfer in all EC ( European Community) countries. Metrological approvals are also obtained in Brazil, Bulgaria, Hungary, Czech Republic, Romania, Algeria, Malaysia and China, others are in process. Material of Construction The materials of construction are listed in the table below. Part & Material Housing : Ductile Iron ( EN-GJS-400-18-LT) Carbon Steel ( Cast or Welded) Stainless Steel ( on request) Straightening Vane : Aluminium Turbine Wheel : Aluminium Metering Insert : Aluminium Bearing Block : Aluminium Bearings : Stainless Steel Shafts : Stainless Steel Gears : Stainless Steel or Synthetic Material Magnetic Coupling : Stainless Steel Index Head : Aluminium SPECIFICATIONS Nominal diameter : DN 250 ( mm) / ( inch) ( 10" ) Size Rating ( G) : G 2500 Qmax [ m3/ h] : 4000 Qmin ( standard flow range) : 200 [ m3/ h] Roating Speed Turbine wheel : 2900 Qmax [ min 6 1] Turbine Wheel Blade angle : 30 Number of blades : 24 Max.frequency HF1/ HF2 : 1200 approx .[ Hz] Max.frequency HF3/ HF4 : 90 approx .[ Hz] Max.frequency 1R1 Reed [ Hz] : 0, 11 K-factor ( HF1/ HF2 approx. : 1110 [ Imp/ m³ ] ) K-factor ( HF3/ HF4 approx. : 80 [ Imp/ m³ ] ) K-factor ( 1R1 Reed [ Imp/ m³ ] ) : 0, 1