Experience with gas calibration within the last 30 years BY JESPER - - PowerPoint PPT Presentation

Experience with gas calibration within the last 30 years

BY JESPER BUSK, FORCE TECHNOLOGY

About me

at FORCE Technology since 1983. Oil & Gas flow since 1989. for the construction of the high-pressure facilities and primary facilities. responsible for flow in Denmark Acitivity on behalf of FORCE Technology

EMPLOYED HEAD OF DEPARTMENT PROJECT MANAGER EURAMET EuReGa

Agenda

• Metrology in FORCE Technology
• 30 years of gas flow history
• High-pressure calibration facilities at FORCE Technology
• Uncertainty level
• Traceability from primary piston prover standard
• EuReGa
• Closed/open loop calibration technology

CALIBRATION

• Flow, temperature, pressure, torque,

volume, weight, balance, force

• VERIFICATION & INSPECTION
• Water, heat, oil and gas meters
• TYPE TESTING & APPROVAL
• Water, heat, oil and gas meters
• SERVICE & REPAIRS
• CONSTRUCTION OG MEASUREMENT

SYSTEMS

• EDUCATION & CONSULTANCY SERVICES

Metrology in FORCE Technology

• atm. facilities with air

1985 1992 1996 2003 2014 2013 8 bar facilities with air High-pressure facilities 32000m3/h@65 bar Primary facilities 400m3/h@100 bar and EuReGa member High-pressure facilities 6500m3/h@50bar 2020 Higher pressure? Higher flow? Microflow, from 1 ml/min 2006 10000m3/h @50bar

Gas flow history

CALIBRATION As found – Adjustment - As left - Verification - sealing Before adjustment, After adjustment. Communication with service advisors Cleaning the meter CERTIFICATES Certificates with digital signature Hard copy certificates Lot of individual needs about information in the certificate. (spin- down test, Hz, Meter-factor pr. point, customer set-up, imperial units etc.) Parameter list within the certificate Logging/adjustment in manufactures USM

20:1 50:1 100:1 2017 2010 1985 What will happen next?

Calibration range

0,25 – 0,30% 1985 0,10% 2020 What is needed?

2005

0,20-0,25% 2015 0,15 – 0,20%

Uncertainty

Requirement from accreditation body 1985 Requirements from manufacturer Requirements from end-user 2008 to 2017

Certificate documentation

Adjustment

1985

Just gear-wheels of turbine meters

2017

K-factor Lineazation Constant Point to point Multipoint Piece-wise linear Polynomia Gear Wheels

forcetechnology.com 1985

• End-user present
• Inspector present
• Manufacture present
• Legal authority
• Project team
• Middle-men

below 20/year 2017 Above 700/year

Customer present

2017 1985 stop

Prices are decreasing

Missing meter to a booked slot Any customers present? (who will participate) Internal audits The time is running Mounting/Dismounting Flange rating and pipe schedule Leaking connections Temperature tappings in customer spools Dust in spools

CHALLENGES IN A HIGH-PRESSURE LABORATORY

12” High-pressure facilities

12” High-pressure facilities

Our own development – length compensator

24” High-pressure facilities

Technical data

12“ 24”

Calibration pressure: 0 - 50 bar Flow: 5 – 10 000 Meter sizes: 2” - 18” Calibration pressure: 0 - 65 bar Flow: 8 – 32 000 (41000 m3/h at low pressure) Meter sizes: 4”- 42” (52”)

Closed loop for calibration with natural gas

• the principles behind the 24” closed loop

The blower system

Circulates the gas in the loop Compensates for the pressure drop in the loop Keeps the flow stable Makes a lot of noize Uses a lot of power

Gas in Gas

• ut
• Access to 40 bar gas grid
• 200 bar gas storage that is filled from a

compressor

• Gas grid is connected directly to the loop
• Gas storage used for pressure above 36 bar
• Gas is evacuated from the loop through and

into a 4 bar distribution line

Cooling system/heating system

• Gas is cooled with water through a heat exchanger
• The cooling system helps to keep the gas temperature constant

A water reservoir is used to store cooling water

• Water is cooled at night and used during

calibrations A second water reservoir is used to store hot water

• The hot water is used for heating when needed

Traceability and uncertainty: Example from SI unit to customer meter

SI Unit

Transfer standards calibrated against the Piston Prover Hydraulic driven twin High Pressure Piston Prover

400 m³/h, CMC: 0,07%

Customer meter 5 - 32000 m³/h 0-65 bar

CMC: 0,14 – 0,21%

Boot strapping system

CMC: 0,08 – 0,12%

Uncertainty Budget:

Calibration of customer meter by using 6 Inch Working Standard

Model Equation: EDUT = ((impDUTend - impDUTstart)/IDUT/ (((impWS5end - impWS5start)/IWS5*(Po+dPDUTWS)/Po*TDUT/TWS5*ZDUT/ZWS5/(1+0.01*(EWS5+CWS5+driftWS5))))-1)*100

Result:

Quantity: EDUT Value: 0.0 % Expanded Uncertainty: ±0.15 % Coverage Factor: 2.00 Coverage: manual Quantity Value Standard Uncertainty Degrees of Freedom Sensitivity Coefficient Uncertainty Contribution Index impDUTend 10000.000 imp 0.289 imp ∞ 0.010 2.9·10-3 % 0.2 % impDUTstart 0.0 imp. 0.289 imp. ∞

• 0.010
• 2.9·10-3 %

0.2 % IDUT 5300.9 imp/m3 impWS5end 10000.000 imp 0.289 imp ∞

• 0.010
• 2.9·10-3 %

0.2 % impWS5start 0.0 imp 0.289 imp ∞ 0.010 2.9·10-3 % 0.2 % IWS5 5300.9 imp/m3 Po 4.0132 bar 0.0144 bar ∞ 0.18 2.7·10-3 % 0.1 % dPDUTWS 0.030000 bar 577·10-6 bar ∞

• 25
• 0.014 %

3.8 % TDUT 293.1500 K 0.0289 K ∞

• 0.34
• 9.8·10-3 %

1.8 % TWS5 293.1500 K 0.0289 K ∞ 0.34 9.8·10-3 % 1.8 % ZDUT 0.99 - ZWS5 0.990000000 - 618·10-9 - ∞ 100 62·10-6 % 0.0 % EWS5 0.7453 % 0.0450 % 250 0.99 0.045 % 37.2 % CWS5 0.0 % 0.0289 % ∞ 0.99 0.029 % 15.3 % driftWS5 0.0 % 0.0462 % ∞ 0.99 0.046 % 39.2 % EDUT

• 2.2·10-3 %

0.0732 % 1800

Primary system: Twin high-pressure piston prover

Hydraulic driven twin high-pressure piston prover

Max pressure:

100 bar.

Flow range:

1 – 400 m³/h Forward and reverse movement during calibration

EuReGa

Traceability on the basis of mass. Traceability on the basis of length Traceability on the basis of length. Traceability on the basis of length and mass

EuReGa Harmonized references

• 8 turbine meters are used as Harmonized references
• 2 X 4”, 2 X 6”, 2 X 10”, 2 X16”
• Flow rates 25 – 6 500 m3/h
• Pressures 8-50 bar A
• Each reference contains an upstream flow conditioner, and upstream and downstream spools
• Upstream flow conditioner, upstream spool, meter and downstream spool are sent assembled

between calibration facilities.

The future of EuReGa Harmonized references

• Looking for possibilities to add the harmonization with 2 24” meters, and 30000 m3/h at 60 bar
• 1 turbine meter
• 1 USM meter

It is time to test a USM meter as a Harmonized reference.

ADVANTAGES

Energy and cooling demand not as high as for closed loop

DISADVANTAGES

Maximum pressure dependent of the pressure in grid where gas is taken from Max flow rate is dependent of the capacity of the grid Gas composition may change during calibration Flow rate stability depends on stability of grid pressure

Open loop technology

ADVANTAGES

Can reach any pressure and flow rate within the capacity of the loop

DISADVANTAGES

High energy and cooling demand Limit in pressure drop across the meter to be calibrated

Closed loop technology

Calibration with same gas for the duration of the calibration

Safety – very important We do what we can to keep your safe More than 25% of the investments used on safety systems

Thank you for your attention! Jesper Busk Head of Oil & Gas Flow jrb@force.dk

• Tel. +45 22 69 76 20