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GE Energy

Dresser*Calibration Benches


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Introduction

GEs Energys Dresser Calibration Benches are

designed or the testing and calibration o com-

monly used gas meters including diaphragm,

rotary and turbine and some types o ultrasonic

meter. The Dresser Calibration Benches can be

operated manually, automatically and remotely

(including active online support rom GE energy

and the Dutch Metrological Institute NMi upon

request). The Dresser Calibration Benches employ

innovative technology to deliver perormance.

Operating Principle

The Dresser Calibration Bench uses a number o

G650 Pulsation Free Rotary meters (RM-TWIN) and

a G16 Rotary meter in parallel as master meters,

to measure the volume passed through the

Meter-Under-Test (MUT). With an approved range

o 20 - 1000 m3/h or the G650 RM-TWINS each

and 0,5 - 25 m3/h or the G16 rotary meter, the

range o the Calibration Bench is summarized

as ollows:

CC1000: 0,5 - 1000 m3h.

CC2000: 0,5 - 2000 m3/h.

CC3000: 0,5 - 3000 m3/h.

CC4000: 0,5 - 4000 m3/h.

The application o Pulsation Free Rotary meters

in-parallel is commonly used in advanced

Calibration Systems all over the world. As shown

in the image below, the primary high pressure

reerence meter (Trasys = Traceability System) o

NMi is based on a parallel operation o ive pulsation

ree rotary meters.

The Dresser Calibration Benches can produce results

with an overall uncertainty better than 0,25% with

traceability to the NMi.

GE Energy continues to improveon gas metering and fow controlequipment with innovative ideasand sophisticated technology andmodular designs.


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Maintainable Metrology

The Dresser Calibration Bench incorporates

technology that allows users to monitor and maintain

system metrology. Our operating system checks

metrology at a series o overlapping low ranges

during normal operation. The system also cross

checks accuracy at the Master Meter and Meter

under test or with a Dresser or NMi calibrated

reerence meter.

Sufficient Overlap: The G16 and G650 have an

overlapping range in which comparison with the

Meter Under Test (MUT) must generate the same

results.

Continuous Cross Checking: During each test, the

MUT can be compared with all the individual masters

meters giving an indication about the ongoingperormance and accuracy o the test bench.

Reference package: When a reerence package

is used, consisting o a calibrated rotary meter

G16, G160 Twin and a G650 turbine, each Dresser

Calibration Bench can be checked/veriied/validated,

to meet metrology requirements. (Common practice

is to veriy the installation on a regular bases, unless

the cross checking-as mentioned earlier-generates

doubtul results.) This operation-just install the

Reerence meters and consider them as the MUT-can

be done locally by the operator o the Calibration

Center.

To report the traceability to recognized Notiied Bodies

(NB) such as NMi, a regular comparison with reerence

meters o the notiied body is required. To reduce

operational cost and maximize the availability o the

Dresser Calibration Bench, NMi can veriy the entire

installation with a highly accurate reerence meter

consisting o a 10-points calibrated G16 a

G160 TWIN and a G650 turbine. For more detailed

inormation regarding veriication and validation

using a reerence meter the NMi or the localGE representative can be contacted.

Header/Damping Device

FlowControl


Veriication using Local Transer Module 0,5 - 1000 m 3/h

25

1000TWIN

251000TWIN

1000TWIN

1000TWIN

1000TWIN



251000TWIN

1000TWIN

1000TWIN

1000TWIN

MUT

FlowControl

Continuous Comparison at 20 - 25 m3/h (overlap)Continuous Comparison by run switching

Veriication using MNi Transer Module 0,5 - 1000 m3/h


FlowControlHeader/Damping Device

25

1000TWIN

251000TWIN

1000TWIN

1000TWIN

1000TWIN

For less advanced, more traditional test benches not

using parallel master meters, veriication/validation is

rather expensive and time consuming since a number

o large size reerence meters are needed to veriy and

validate the acility. In most cases, these reerence

meters are to be brought in rom ar away.


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In the outlet section o the MUT as well as each

Master Meter, a temperature sensor is installed to

correct the low according to the law o Boyle-Gay-

Lussac. To eliminate inluences o pressure luctua-

tions, the pressure at the MUT and the Master Meter

is compared to a dP-cell instead. Barometer pressureis measured and applied in the error calculations.

To minimize the eect o temperature and pressure

changes, each second the data is retrieved rom the

sensors and averaged in the error calculations.

The Dresser Calibration Benches are itted with an

automatic leakage control using compressed air,

to pressurize the piping in between the MUT and

the Master Meters. During the leakage testing, the

variations in pressure are monitored. In each Master

Meter Run two butterly (block) valves guarantee

leak tightness. A small leakage will cause additionalerrors especially when the low rate is low. The use o

two such block valves is in accordance with the PTB

guidelines or test benches.

A part o the required outlet section o the turbine

meter as MUT has been integrated into the header.

All the smaller size connection langes including the

required straight outlet section o the turbine meter

as MUT are connected to this basic lange connec-

tion. These connection spool pieces are optional and

have to be customer speciied at order or can be

made locally (a set o drawings is part o the scope osupply). Each connection spool piece has been itted

with a temperature tapping.

Rotary meters as MUT will generate pulsations,

except or pulsation ree designs like the Dresser

Series RM-TWIN. The pulsation orms a longitudinal

wave in the adjacent piping and can aect the

accuracy o the calibration. To reduce the eect o the

longitudinal wave a damping device is installed. The

volume and the internal shape o this damping device

(header) eliminate the eect o the pulsation. To reduce

the eect o pulsation at the inlet o the rotary meter

(MUT) it is essential that the meter is tested with anopen inlet. In this case, the entire test room is used as

damping device.

The Calibration Bench blower, able to reach a dP o 80

mbar over a large low range is sucking the air through

the Master Meters and MUT. The dP o 80 mbar enables

serial testing o meters. To reduce electrical energy

dissipation, the low rate is adjusted by means o

requency control. The controller is placed in a electric

cabinet sized or low rates, less than 1000 m3/h, two

pneumatically activated valves (6 butterly and 1 1/2

plug) as shown on igure 11, are used. During testingthe air low controls the requency and the position o

the valves are ixed to provide a steady low.

Human Machine Interface (HMI)

During test set-up the operator is guided by the HMI

(Human Machine Interace) sotware, and can select

rom a menu o predeined meters and test runs. Once

test set-up is complete the Dresser Calibration Bench

will run through each test, automatically changing low

rates or each test, processing and storing relevant test

data. When the test is complete the operator can print adetailed report. The Dresser Calibration Bench sotware

runs on a dedicated PC, and includes several security

levels.The HMI consists o:

PC with test bench sotware including backup

o relevant data

20 screen monitor

Mouse and keyboard


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Advanced Electronic

The Dresser Calibration Bench uses an advanced

time-measurement to determine the passed volume

through the MUT and the Master Meters. This time-

measurement reduces the time or testing the MUT andprovides increased daily throughput o the calibration

bench. All sensors are connected to an industrial PLC,

this PLC measures and calculates the time and all

relevant data such as temperature and pressure It

switches all mechanical devices such as the valves. The

PLC is connected with the PC. Through the PC one can

arrange the settings o the operational parameters or

the test bench itsel and the MUT (such as the sequence

or type o the test run) and the reporting, displaying,

evaluation and validation o the results.

XP Platform HMI

Software Features:

System based on MS Windows** XP Proessional

Test program or turbine-and rotary gas meters

Menu-controlled user guidance

Graphical process display

Screen output o all process data

Automatic storage o all meter data on hard disk

Measuring data protocol on screen and printer

Ergonomic menus with extended tree structure

Special User Guidance Menu

Complex User-Rights-Management. Rights can be

deined or each user (Dierent user classes like

operator, administrator, metrological authorities,

management, etc.)

All parameters can be set in the program

(depending on user rights)

Dierent meters and preerred test sequence can be

deined, copied and implemented

Parameters or test sequences can be change during

running the test

Integrated Tool List & Label or complex protocol

deinitions, an unlimited number o protocols (e.g.

dierent languages) can be deined

Basic statistics eatures o all tested meters

Remote Control Sotware

Input masks with extended plausibility checks

Integrated database or all parameters and results

Integrated diagnostics or test bench unctions

Technical Data Master Meters Sensors

Rotary Meter RM G16 Range: 0,5 - 25 m3/h

Repeatability: better than 0.05% Construction: single set impeller concept

2 HF with Reerence Disc

Rotary Meter RM-TWIN G650 Range: 20 - 1000 m3/h

Repeatability: better than 0.05 %

Construction: Pulsation Free TWIN

2 HF with Reerence Disc

Temperature Sensor

Range: 0 - 40C Repeatability: better than 0.05C

4 wire PT100

dP Sensor

Range: 0 - 50 mbar

Repeatability: better than 0.1 mbar

Absolute Pressure Sensor Range: 900 - 1100 mbar

Repeatability: better than 1 mbar

Technical Data iMCC

Skid and headers Steel, RAL painted

Outlet Header inside isolated (damping)

Valves Type: Butterly (Block and Bleed)

Size: 6 (150 mm)

Actuator: Double Acting Pneumatic

Minimum Pressure: 5 bar

Filters Wire Mesh 150 micron

Stainless steel

Blower/Frequency Control: Blower: Rotamill, maximum dierential pressure

80 mbar, power consumption approx. 15 KW

Frequency converter: SEW Movidrive

Rittal Cabinet (W=800)

Blower/Frequency Control Blower: maximum dierential pressure 80 mbar,

power consumption approx. 15 KW

Frequency converter

** Registered trademark o Microsot Corporation.


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Control Valves Plug Valve: Electronically/Pneumatically actuated

Butterly Valve: Electronically/Pneumatically

actuated

Technical Data Dresser Calibration Bench

Electronics Electric Cabinet

Power Consumption: approx. 2KW

Technical Data PC Keyboard, Mouse (English Version)

Windows XP Pro. (English Version)

Remote-Control Sotware

CC1000 CC2000 CC3000 CC4000

Master RM 1 1 1 1

Master RM-Twin G650 1 2 3 4

Total Range (m3/h) 0,5 - 1000 0,5 - 2000 0,5 - 3000 0.5 - 4000

Overall Uncertainty


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TS: Calibration Bench9.11

GE Energy

Dresser Meters & Instruments

16240 Port Northwest Dr., Suite 100

Houston, TX 77041

P: 832.590.2303

F: 832.590.2494

7051HS Vasserveld

The Netherlands

P: +31 (0) 31527 1100

F: +31 (0) 31527 1105

Visit us online at:www.ge.com/energy

2011 General Electric Company

All Rights Reserved

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