rmg rotative meter 132-a new
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SERVING THE GAS INDUSTRY WORLDWIDE
Technical Product Information
ROTARY DISPLACEMENT METER RMG 132-A
RMG Messtechnik GmbH
ROOTTARY DISPPLAACEEMENTT MMETER RMG
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ROTARY DISPLACEMENT METER RMG 132-AApplication, method of operation, testing, maintenance
Application
• RMG 132-A rotary displacement meter for volumetric gas measurement in gas distribution stations and in domestic, administrative and industrial buildings.
• Suitable for use with all non-corrosive gaseous media, such as natural gas, propane, butane, nitrogen, air, etc.
• For vertical or horizontal installation in both fl ow directions.• No inlet or outlet pipes are required for operation.• Can also be used in the case of intermittent gas withdrawal.
Method of operation
The rotary displacement meter is a gas meter which measures the volume of gas and operates on the displacement principle. It records the gas volume at actual line conditions (i.e. volume at measurement conditions) which has fl owed through the gas meter. A downstream volume corrector can be used to convert this volume into the volume at base conditions.
The rotary displacement meter consists of the actual measuring element and a totalizer to display the volume at measurement conditions. When the gas decreases, there is a pressure drop between the meter inlet and outlet which produces a torque at the two rotary pistons. As soon as this torque exceeds the holding torque of the rotary pistons, the pistons start to rotate. The rotation of the pistons is force-controlled by precision gears located outside of the measu-ring chamber.
In the further course of the rotation of the pistons, the two sections of the measuring chamber of the rotary displace-ment meter are periodically fi lled and evacuated. There is a non-contact seal between the two measuring chamber sections which is achieved by minimum gaps between the rotary pistons themselves and between the rotary pistons and the casing.
The rotational movement of the pistons is transferred through a magnetic coupling to the pressureless compart-ment of the totalizer where the rotations are added and then displayed on a digital index as volume (m3, ft3). The totalizer is installed rotatably and can be adjusted to the relevant po-sition for installation and direction of fl ow of the gas meter.
LF and HF pulsers can be fi tted in the totalizer. They gene-rate an electric volume pulse which is further processed by appropriate supplementary equipment. The rotary displace-ment meter starts to operate at a pressure drop of less than 0.1 mbar and a fl ow rate of less than < 1/1000 Qmax.
Testing / Gas meter calibration
The rotary displacement meters correspond to DVGW, PTB and EC regulations and other international and national re-gulations of various countries. In our staterecognized testing laboratory for gas measuring devices, each rotary displace-ment meter is tested in operational condition and checked for compliance with the error range. It is then provided with an offi cial seal which identifi es it as being approved for custody transfer metering.
The quality details resulting from the strength and leak tests are documented in accordance with national and internatio-nal standards.
Installation and maintenance
The rotary displacement meter is to be installed in the pipeline with minimum stress using appropriate seals and screws according to standards. No base is required for the gas meter.During installation, the rotary displacement meter is to be aligned using a spirit level, so that the piston axes are in a horizontal position.This ensures uniform lubrication of the gear parts in the front and rear covers.For troublefree operation of the gas meter, only fi lter-purifi ed gases with a solids grain size of less than 50 μm are permis-sible. It is recommended that a fi lter or at least a start-up screen be installed.The gas meter is supplied without oil. As soon as the un-pressurized gas meter has been installed in the pipeline, the cover compartments are to be fi lled with oil.This has to be done gradually in order to avoid fi lling beyond the sight-glass area.
When commissioning the gas meter, pressure shocks are to be avoided. The process should be performed slowly. Maintenance of the gas meter is limited to an oil-level check which is to be performed approximately once a year. For this purpose, the rotary pistons must be at rest. If the oil level falls below the centre mark of the sight glass, oil has to be topped up.We would recommend using the oil types Shell Tellus oil 10 or BP Energol HLP 10 or a comparable oil with a kinematic viscosity of 10 mm2/s at 40°C.The totalizer is completely maintenance-free.The gas meter can also be used in outdoor installations if an appropriate protection against the weather is provided.For special information about installation and maintenance, see the Operating and Maintenance Instructions 132.20.
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ROTARY DISPLACEMENT METER RMG 132-ACapacity data
CAPACITY DATA
SizeDN
(inch)Qmax
m³/hV
dm³
Qmin
m³/hPulse
Measuring range LF HF1:20 1:50 1:65 1:80 1:100 1:160 Pulses/m³ Pulses/m³*
G 4050(2“)
650.67
3 1.3 1 0.8 0.6 - 10 6000
G 65 100 5 2 1.6 1.3 1 0.6 10 6000
G 10080(3“)
160 1.07 8 3 2.5 2 1.6 1 1 3750
G 160 250 1.67 13 5 5 3 2.5 1.6 1 2400100(4“)
NOTE: Standard - measuring range 1:50 * Approx. values; see the pulser plate for the precise pulse value.
Average error curve (Qt - as a function of the measuring range)
Average pressure loss curve
Erro
r of m
easu
rem
ent %
Flow rate m /h3Qmin Qt
QmaxG
0
-2
-1
+1
+2
Pres
sure
loss
mba
r
Flow rate m /h3
Qmin QmaxG
Natural gas
Air
2
0
1
3
4PRESSURE LOSS
SizeAir
(ρ=1.2 kg/m³)Natural gas
(ρ=0.83 kg/m³)
G40 1.5 1.0
G65 3.3 2.3
G100 3.6 2.5
G160 3.4 2.4
(Average pressure loss in mbar at Qmax)
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ROTARY DISPLACEMENT METER RMG 132-ADimensions and weights, taps
DIMENSIONS AND WEIGHTS
Size DN(inch)
A B C D E Weight Flanges withthreaded holes
mm kg DIN 2501 ANSI B 16.5
G 4050(2“)
350 230 120 180
- -
4x M16 4x 5/8171 13
G 65- -
171 13
G 100 80(3“)
420 265 155 180171 16
8x M16 4x 5/8241 22
G 160 528 320 208 210
241 23
100(4“)
241 23PN16
8x 5/88x M16
300 29PN25
8x M20
NOTE: The overall lengths greyed out have rings on both sides.
1 - Totalizer, 2 - Measuring element, 3 - Pressure tap, 4 - Temperature tap, 5 - Pulser connection, 6 - Oil-level gauge
Temperature taps
The temperature taps are required for installing thermo-wells for resistance thermometers. They are located on the inlet and outlet fl anges of the gas meter. Note: Standard – without thermowells; threaded holes sealed with screw plugs.
Pressure taps
Pressure taps are required to determine the pressure at measurement conditions when a volume corrector is connected or for diff erential pressure measurement via the gas meter.The gas meter has one pressure tap on each of the inlet and outlet fl anges.
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ROTARY DISPLACEMENT METER RMG 132-ATechnical data
RMG 132-AMaterial AluminiumSize G 40 – G 65 – G 100 – G160Pressure rating PN 16, ANSI 150Installation position / Direction of fl ow Horizontal or vertical / universalInstallation No inlet or outlet section requiredOperating temperature range -40°C to +60°CDesign Adapted to DIN EN 12480
Approvals- PTB approval up to 1 :160- EC approval- other international approvals
Degree of protection IP 65MaterialsCasingPistonsGears
Aluminium alloyAluminium alloySteel, hardened and ground
Type of connection Flanges with threaded holes
Connecting dimensionsDIN 2501ANSI B 16.5 RF
Variants offl anged ends
PN 16 – DIN 2501ANSI150 – ANSI B 16.5 RF
Measuring ranges 1: 50 (standard) up to 1 : 160 (option)
Accuracy< 2% at Qmin
< 1% at Qmax (factory-provided: 0.5%)
Repeatability < ±0.1%Pressure loss See table on page 3Overloading For a short time up to 1.25 Qmax
Rate of pressure variations < 0.5 bar/sMeasuring taps Pressure and temperature taps are located in the inlet and outlet of the meter casing.Pulse transmitters 1x LF(reed), further LF or HF (NAMUR) pulsers as optionOil-level gauge On the front (standard), on both sides as option
Mechanical totalizer
- Double totalizer as standard- 8-digit index in m3 (standard) or ft3 (option)- Optical start-up display- Can be universally adapted to the direction of fl ow; a representative of the weights and measures offi ce need not be present on this occasion.
TEMPERATURE TAPS PRESSURE TAPS
Rotarydisplacement meter Thread
Installation variants for thermowells
2x inlet 1x inlet 1x inlet1x outlet Thread Seal of
threaded hole
Al / PN16M14 x1.5 X
X X M10 x1Screw fi tting with
sealing cone for pipes with dia. Ø6G 1/2 * -
Al /ANSI1503/4 NPT -
X X 1/4 NPT Screw plug 1/4 NPTG 1/2 * -
* on request
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ROTARY DISPLACEMENT METER RMG 132-A
Flow variants
The position for installation or direction of fl ow can subsequently be changed by simply turning the totalizer or the tota-lizer cap. For further details, see the Operating and Maintenance Instructions 132.20.
Flow variants
Pulse transmitters
The totalizer can optionally be fi tted with one or more pulse transmitters. Signals are picked up through a lateral plug.
TypesLF - reed switch, polarity-independent - operating voltage U = 5-24 V DC - switching current, max. I = 10 mA
HF - NAMUR slot-type initiator, polarity to be observed - operating voltage U = 8 V DC - current input approx. 3 mA
Variants - without pulse transmitter - 1 x LF (standard) - 1 x LF, 1 x HF - 1 x LF, 2 x HF - 2 x LF - 2 x LF, 1 x HF
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ROTARY DISPLACEMENT METER RMG 132-A
Ordering information (example)
Device designation:
Device designation, accessories
RMG 132-A - Al - G65 - DN50 - PN16 - 171 - 1:80 - SU - 2x NF - 2x (inlet)
Type
ORDERING INFORMATION
Casing material Al
Size G40; G65; G100; G160
Nominal diameterDN 50 (2˝ )DN 80 (3˝ )DN 100 (4˝)
Pressure rating/ Flanged ends PN16; ANSI150
Overall length E See table
Measuring range 1:20; 1:50; 1:65; 1:80; 1:100; 1:160
State in which supplied - Position for installation / Direc-tion of fl ow
SU - perpendicurlarly downwards (standard, if not indicated otherwise)
WR - horizontally to the rightSO - perpendicurlarly upwardsWL - horizontally to the left
Pulse transmitters
1x LF, 1x LF 1x HF, 1x LF 2x HF, 2x LF,2x LF, 1x HF
Thermowells
0; 1; 2** Type of installation:1x inlet, 1x outlet 2x inlet
Casi
ng m
ater
ial
Size
Nom
inal
dia
met
er
Pres
sure
ratin
g /
Flan
ged
ends
Over
all l
engt
h
Mea
surin
g ra
nge
Stat
e in
whi
ch s
uppl
ied
- Pos
ition
for i
nsta
llatio
n /
Dire
ctio
n of
fl ow
Puls
e tra
nsm
itter
s
Ther
mow
ells
Accessories
• Thermowell- Integral thread M14x1.5 G 1/2 – on request Connection of the temperature sensor G1/4- Integral thread 3/4 NPT Connection of temperature sensor on request
• Start-up screen (mesh size 0.4 mm)• Volume corrector• Fastening bracket for Volume corrector• Three-way check valve
Status 11/2008 Rotary Displacement Meter RMG 132-AWe reserve the right for technical changes
WÄGA Wärme-Gastechnik GmbHOsterholzstraße 45D-34123 KasselPhone +49 (0)561 5007-0Fax +49 (0)561 5007-207
RMG Gaselan Regel + Messtechnik GmbHJulius-Pintsch-Ring 3D-15517 FürstenwaldePhone +49 (0)3361 356-60 Fax +49 (0)3361 356-836
CANADA
Bryan Donkin RMG Canada Ltd.50 Clarke Street South, WoodstockOntario N4S 7Y5, CanadaPhone +1 519 53-98531 Fax +1 519 53-73339
USA
Mercury Instruments LLC3940 Virginia AvenueCincinnati, Ohio 45227Phone +1 513 272-1111Fax +1 513 272-0211
GERMANY
RMG Regel + Messtechnik GmbHOsterholzstraße 45D-34123 KasselPhone +49 (0)561 5007-0Fax +49 (0)561 5007-107
RMG Messtechnik GmbHOtto-Hahn-Straße 5D-35510 ButzbachPhone +49 (0)6033 897-0Fax +49 (0)6033 897-130
ENGLAND
Bryan Donkin RMG Gas Controls Ltd.Enterprise Drive, HolmewoodChesterfi eld S42 5UZ, EnglandPhone +44 (0)1246 50150-1 Fax +44 (0)1246 50150-0
POLAND
Gazomet Sp. z o.o.ul. Sarnowska 263-900 Rawicz, PolenPhone +48 (0)65 54624-01 Fax +48 (0)65 54624-08
RMG is your competent partner along the entire chain ran-ging from the exploration to the supply of fi nal consumers. Our reliable products and systems off er to you full control within the range of regulating and measuring technology.
Furthermore we plan and build plants according to your requirements and off er to you reliable and modern soluti-ons also in station automation. Ask us - we look forward to your challenges.
SERVING THE GAS INDUSTRY WORLDWIDE
WWW.RMG.COM. G.CO. G.CO
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