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		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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