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Turbine Gas Meter Series FMT-Lx 

  • Turbine Gas Meter

    Series FMT-Lx
    TECHNICAL CHARACTERISTICS
    Metrological approvals: compliant with MID T10466 – 2014/32/EU
    compliant with OIML R137
    ATEX approvals: sensors compliant with Ex ia IIC T4… T6 Gb (-40°C ≤ Ta +70°C)
    encoders compliant with Ex ib IIb T3… T6 Gb (-25°C ≤ Ta +55°C)
    Nominal diameters: from DN 50 to DN 600 mm (2″ to 24″)
    Pressure rates: PN 10 – 100, ANSI 150 – 600
    Flow rates: 10 up to 10.000 m³/h
    Length: 3x DN
    Temperature Range: ATEX: -25°C to +70°C
    MID: -25°C to +70°C (lower temperatures on request)
    PED: -20°C to +70°C (lower temperatures on request)
    Materials:
    Body (Standard):  low weight aluminium / steel
    Body (Optional): low temperature steel
    Straightening vane: aluminium
    Turbine wheel: aluminium
    Cartridge: aluminium
    Bearing block: stainless steel / aluminium
    Bearings: stainless steel
    Shafts: stainless steel
    Gears: Delrin
    Index frame: Aluminium
    Index frame: polycarbonate ECI

    Mounting position horizontally or vertically
    Removable meter cartridge
    No straight inlet/outlet sections required
    Oil flushing and lubrication system
    Multipurpose exchangeable index
    Tamper proof IP67 sealed index
    Special meters on request

    INTRODUCTION

    The FMT-Lx series turbine meter is a robust meter, designed to perform to the highest level of accuracy. The meters comply with all international standards and are approved for custody transfer. The actual flow sensor, an exchange- able cartridge, has a built-in multi-stage flow conditioner enabling the meter to be installed without any need for upstream or downstream straight sections. All are tested and proved according to perturbation tests as per international standards. The cartridge can be pre-calibrated, under both low and high pressure conditions, and then exchanged on-site. The cartridge is supported in O-rings and insulated from the body, and hence is unaffected by any influences from the housing. The short length cartridge enables the use of cartridges that are larger than the size of the meter body. The approved maximum capacities of these meters are extremely high and similar to the capacities of ultrasonic meters. The FMT-Lx series of turbine meters up to 6’’ (DN150) are also available with low weight aluminium meter bodies which reduces transportation costs, optimizes corrosion protection and improves safety in handling.

    PRINCIPLE

    The operation of the FMT series of turbine meter is based on the measurement of the velocity of gas. The flowing gas is accelerated and conditioned by the integrated multi-stage flow conditioner. The multi-stage flow conditioner prepares the gas flow profile by removing undesirable swirl and asymmetry before the gas flows over the freely rotating turbine wheel. The dynamic forces of the flowing gas cause the rotor to rotate. The turbine wheel is mounted on the main shaft, with high-precision, low-friction ball bearings. The turbine wheel has helical blades that have a known angle relative to the gas flow. The gas flow drives the turbine wheel at an angular velocity, which is proportional to the gas velocity. Using a gearing mechanism, the rotating turbine wheel drives the mechanical counter.

    APPLICATIONS

    The standard FMT-Lx turbine meter is suitable for custody transfer gas measurement of all non-corrosive gases such as natural gas, propane, butane, air, nitrogen, hydrogen, etc. with low and high operating pressures. Special con- structions can be supplied for use under extreme conditions such as high tem- peratures or corrosive gases. The FMT-Lx can be modified for use as a master meter or transfer master meter.

    ACCURACY

    Each FMT-Lx turbine gas meter is tested with atmospheric air to traceable calibrated references. The error limits are typically half of those allowed by MID, EN standards or OIML recommendations. For pressures above 8 bar even narrower limits are available. Optionally, meters can be calibrated with natural gas at pressures up to 100 bar, using test installations traceable to primary standards.

    TYPICAL METROLOGICAL CHARACTERISTICS
    Accuracy 0,2 Qmax to Qmax:

    ± 1% or better

    Accuracy Qmin to 0,2 Qmax:

    ± 2% or better

    Repeatability: better than 0,1%
    MEASURING RANGE

    The measuring range of the FMT-Lx turbine meter is determined under atmospheric conditions and meets with, and generally exceeds, international standards. At higher operating pressures the measuring range of the turbine meters will increase since the required kinetic energy transfer to the turbine rotor occurs at lower velocities. The following equation may be used to estimate the minimum flow rate of the meter for various operating conditions.

    PRESSURE LOSS

    The average pressure loss of the FMT-Lx turbine meter is measured with atmospheric natural gas with a relative density of 0.6 at one (1) diameter upstream to one (1) diameter downstream of the meter on straight pipe of the same size as the meter. The pressure loss across the FMT-Lx turbine meter for various gases and other operating pressures may be approximated from the following equation.

    INSTALLATION

    The FMT-Lx fulfills all the requirements of the European and International directives. In particular those of the OIML, ISO and EN. With the special integrated flow straightener the FMT-Lx eliminates the effect of severe perturbations on gas measurement. Straight inlet and ouletpiping can be 0 x DN. This permits the design of very compact installations without losing accuracy.

    INDEX

    The basic index consists of an UV-resistant polycarbonate cover, glued (IP67) to an aluminum frame. The aluminum frame will give strength to the index and as such sufficient protection against mechanical interference (Tampering). The index can be rotated over 350o for all directions. The index can be equipped with multiple LF switches (Reed or Wiegand principle), “Normally Closed” tamper contacts and encoder technology. The LF pulsers and its driving magnet are shielded to overcome tampering with
    an externally applied magnetic field. Magnetic fields up to 500 mT will not have an effect on the pulse counting. The index or instrument drive can be equipped with several options making the meter prepared for the future.

    DOUBLE REED PLUS NORMALLY CLOSED CONTACT:

    All basic indexes are equipped with an double reed and a normally closed contact.
    Reverse Flow Lock: In order to avoid tampering by reverse flow, the index or instrument drive can be equipped with a Reverse Flow Lock.

    WIEGAND PULSERS:

    The Index can be equipped with multiple Wiegand pulsers. The Wiegand pulsers do have significant advantages over the traditionally used Reed contacts. Wiegand sensors do not face “bouncing” problems and the actual live time is not limited as much as the traditional Reed contacts..

    INTELLIGENT INDEX/ENCODER:

    The index can be equipped with an intelligent encoder. The encoder sends out the total volume with an interval of 400 msec. The encoder uses a stand- ard NAMUR serial data format, and can be modified to special applications on request. The encoder is powered by one AA cell battery guaranteed for 12 years of operation. On request two AA cells can be installed for a guaranteed life time of 20 years. The encoder is equipped with a special Hall sensor to de- tect and register interferences from external magnets. Several programmable inputs/outputs are available for advanced – anti fraud – functions.

    LUBRICATION

    The FMT-Lx series of turbine meters can be equipped with several types of lubrication systems or with life time lubrication. FMG recommends to use the lubrication system. An integrated splash vane will distribute the oil to all the moving parts and will flush the bearings. The FMT-Lx series incor- porates high quality precision bearings. For optimal life times guarantees it is recommended they should be lubricated and clean. Recommendations as to when to lubricate turbine meters varies by product type, operating conditions, customer procedures, and regulatory requirements. Meter performance is optimized by flushing contamination from the bearings and refreshing or adding of oil during operation.

    HEAVY DUTY BEARINGS

    Since gas pressure causes the main force on the bearings the FMT-Lx series incorporates bearings dedicated to the working pressure. FMT-Lx turbine meters which have a low working pressure are equipped with lighter bearings then the meters which are used at higher working pressures.

    This way the best measuring ranges and life times can be guaranteed.

    HIGH FREQUENCY SENSORS

    FMT-Lx Turbine meters can be equipped with several types of high frequency sensors.

    HF MAIN SHAFT:

    this high frequency sensor generates two independent phase shifted sig- nals and as such the flow direction can be monitored. The signal generated complies with Namur.

    HF TURBINE WHEEL:

    this HF sensor can be used to check the condition of the turbine wheel (missing blades) by comparing the pulses with the HF main shaft.

    For both sensors, the electrical separation between the hazardous and non- hazardous areas is accomplished by an intrinsically safe isolation amplifier.

    APPROVED MAXIMUM CAPACITIES

    All metrological characteristics are embedded in the cartridge, making the meter body a non- essential part of the meter. Hence offering new oppor- tunities as using smaller and larger cartridges in respect to the meter body size (DN). Thus allowing a large variety of capacities. Due to the short length of the cartridge, it can be exchanged for a cartridge of higher capacity. For example, a cartridge for a 6 inch meter can be installed in a 4 inch body. The approved maximum capacities of these kind of meters is extremely high and similar to the capacities of ultrasonic meters.

    FUNCTION

    This series of FMT-L turbine gas meters is designed to guarantee the highest degree of measurement accuracy. The 3 x D aluminium measuring cartridge with integrated flow conditioner system guarantees a high degree of accuracy in measurement, even under difficult flow situations. The measuring cartridge can be pretested and calibrated, and then exchanged under either low pressure or high pressure conditions- all on location. This naturally takes place in consultation with the competent Office of Weight & Measures.

    TECHNICAL DATA

    Dimensions Weight (kg)
    Size G-value Q-max Q-min dp (NG) LF HF Main HF wheel C E H L PN10/16 PN10/16 PN25/40 PN64/100
    (mm) (-) (m³/h) atmospheric air 4bar NG 8 bar NG ANSI 150 ANSI 150 ANSI 300 ANSI 600
    (m³/h) (m³/h) (m³/h) (Pa) (imp/m³) (imp/m³) (imp/m³) (mm) (mm) (mm) (mm) ALU ST ST ST
    50 G65 100 10 5 3 900 10 18440 64540 155 en-table 175 150 8 17 17 17
    G100 160 8 5 3 900 1 22560 67675 155 175 150 8 17 17 17
    G160 250 13 8 5 900 1 8235 28815 155 175 150 8 17 17 17
    G250 400 20 13 8 900 10 5180 20705 155 175 150 8 17 17 17
    80 G65 100 10 5 3 900 1 1845 64540 144 178 240 9 22 24 27
    G100 160 8 5 3 900 1 22650 67675 144 178 240 9 22 24 27
    G160 250 13 8 5 900 1 8235 28815 144 178 240 9 22 24 27
    G250 400 20 13 8 1600 1 5180 10705 144 178 240 9 22 24 27
    G400 650 32 20 13 900 1 2340 9350 144 178 240 9 22 24 27
    100 G65 100 10 5 3 900 10 18440 64540 156 178 240 9 22 24 27
    G100 160 8 5 3 900 1 22560 67675 156 178 240 9 22 24 27
    G160 250 13 8 5 900 1 3915 13700 156 178 240 9 22 24 27
    G250 400 20 13 8 900 1 3915 13700 156 178 240 9 22 24 27
    G400 650 32 20 13 900 1 2340 9350 156 178 240 9 22 24 27
    G650 1000 50 32 20 160 1 2950 5165 156 178 240 9 22 24 27
    G1000 1600 80 50 32 1600 0,1 1435 2865 156 178 240 9 22 24 27
    150 G160 250 13 8 5 900 1 8025 24065 180 213 450 27 61 79 98
    G250 400 20 13 8 900 1 3915 13700 180 213 450 27 61 79 98
    G400 650 32 20 13 900 1 4475 6715 180 213 450 27 61 79 98
    G650 1000 50 32 20 900 1 2950 5165 180 213 450 27 61 79 98
    G1600 2500 125 80 50 1600 0,1 885 1770 180 213 450 73
    200 G400 650 32 20 13 900 1 4475 6715 185 243 600 75 99 133
    G650 1000 50 32 20 900 1 2250 5165 185 243 600 75 99 133
    G1000 1600 80 50 32 900 0,1 1435 2865 185 243 600 75 99 133
    G1600 2500 125 80 50 900 0,1 885 1770 185 243 600 75
    G2500 4000 125 80 900 0,1 440 1310 185 243 600 90
    250 G650 1000 50 32 20 900 1 2950 5165 236 282 750 200 236 315
    G1000 1600 50 32 900 0,1 775 2320 236 282 750 200 236 315
    G1600 2500 80 50 900 0,1 440 1310 236 282 750 200 236 315
    G2500 4000 130 80 900 0,1 440 1310 236 282 750 200 236 315
    G4000 6500 200 130 1600 0,1 245 75 236 282 750 240
    300 G1000 1600 50 32 900 0,1 775 2320 236 283 900 240 285 365
    G1600 2500 80 50 900 0,1 440 1320 236 283 900 240 285 365
    G2500 4000 130 80 900 0,1 245 740 236 283 900 240 285 365
    G4000 6500 200 130 900 0,1 245 740 236 283 900 240 285 365
    G6500 10000 320 200 1600 0,1 125 370 236 283 900 290
    400 G1600 2500 80 50 900 0,1 440 1320 295 328 1200 290 350 460
    G2500 4000 130 80 900 0,1 220 655 295 328 1200 290 350 460
    G4000 6500 200 130 900 0,1 125 370 295 328 1200 290 350 460
    G6500 10000 320 200 1600 0,1 125 370 275 328 1200 290

    * dP, is measured under atmospheric conditions with natural gas with relative density of 0.6 (air=1)
    ** Values can vary by up to 5% due to fabrication tolerances

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