Personal tools
You are here: Home Public Information PROJECT GASQUAL
Log in


Forgot your password?
Blog
« May 2019 »
May
MoTuWeThFrSaSu
12345
6789101112
13141516171819
20212223242526
2728293031
Recent additions
No blog entries are published.
Categories
 

PROJECT GASQUAL

Project description and background

PROPOSAL GASQUAL.EU

 

(extracts from the propsal accepted)

 

ANSWER TO THE CALL FOR TENDER on
GAS QUALITY- PHASE 1 of the Mandate M/400

 

 

Investigations on new acceptable EU limits for gas quality.

Influence on the performance of new and installed gas appliances.

Study Project


 

ABREVIATIONS USED

GAD:                     Gas Appliances Directive 90/396/EEC

Mandate:              “Mandate to CEN for standardisation in the field of gas qualities, 16 January 2007

Call for tender:     Call for tender on Gas Quality - Phase 1 of Mandate M/400” CEN /BT WG 197

EHI:                      European Heating Industry

IGU:                      International Gas Union

NB:                       Notified Body (for the GAD)

GADAC:               Gas Appliance Directive Advisory Committee

 

1          Introduction

1.1          Foreword

This project proposal describes the work to be done and the organisation for the execution of the study described in the “MANDATE TO CEN FOR STANDARDISATION IN THE FIELD OF GAS QUALITIES, 16 January 2007 [A] -M/400 EN “and according to the specification of the document Call for tender on Gas Quality - Phase 1 of Mandate M/400” CEN /BT WG 197 [B].

 

[A] “MANDATE TO CEN FOR STANDARDISATION IN THE FIELD OF GAS QUALITIES, 16 January 2007

[B] Call for tender on Gas Quality - Phase 1 of Mandate M/400” CEN /BT WG 197

 

In the following we shall refer to [A] and [B].

 

1.2          Summary and background for the proposal

This proposal was worked out by a wide group of experts from the gas industry including different stakeholders. Most of the partners have been very active in the field of gas quality, participating in the workshop organised by Marcogaz in 2005 [1] and discussing intensively the action needed in the months following this workshop.

 

It appeared very early that the collaboration of the entire industry was needed to solve such a problem and therefore the consortium consists of a broad representation of gas experts, manufacturers, laboratories, certification bodies and market experts.

 

As boilers are one of the main appliances concerned it was natural to invite into the consortium the partner (BRG) who has already carried out a large study on the EU boiler market for the Commission (DG TREN) [2], and who has carried out the market analysis for the preparatory studies on the ECO design of boilers and water heaters. This allows us to benefit from the experience and data already gathered and avoid duplication of the work.

 

Major notified bodies from countries concerned by the problem (countries using H gas) have been invited to join the consortium (DVGW; AFG; ADVANTICA; REPSOL; ARGB; INIG; DGC) as well as three large appliance manufacturers who have been active in the field of gas quality. In order to involve the whole industry, a preliminary agreement was made with the boiler/burner industry association in order to communicate during the course of the project, in order to benefit from the whole industry input and at the same time in order to have at the earliest possible stage arranged the acquisition of the appliances to be tested. Therefore, a formal liaison has already been agreed upon with EHI. We plan to establish a similar one with CECED. Also at this stage, we shall have informal agreement with partners who will help on some aspects of the study, but who would not require refunding (SVGW, OVGV, MTS).

 

The laboratories have been carefully selected on the basis of the mandate requirements and further requirements that guarantee the highest possible reliability of test results. Those laboratories selected have already participated in several round robin tests and some of the most recent results are presented in this document as a proof of their quality.

 

In order to evaluate the testing costs, the consortium that has prepared this proposal has also in a way started the work, so as to have the most exact picture of the nature and quantity of tests that would be required. Therefore, during the preparation work we had about 5 meetings where the proposal was worked out and where the testing programme was discussed in the light of the present knowledge and experience on the influence of gas quality on gas appliances. The presence of Advantica [3], Repsol [4] and DGC [5], who have completed similar national work, has thus been very useful to make a first estimate of the testing programme which has been reviewed by the laboratories and combustion experts (GASUNIE etc.)  present in the consortium. Despite the fact that the exact budget for testing is not required at this stage we believe it was important to come as close as possible to a realistic figure. Therefore, we have been discussing this programme very extensively and the proposal is therefore as accurate as it can be at this stage.

 

Some references with direct involvement of the proposers

 

[1]: TOWARDS A HARMONISED EUROPEAN GAS QUALITY SPECIFICATION FOR HIGH CALORIFIC GASES Consequences for appliances manufacturers, standardisation and certification bodies, installers, national authorities, servicing organisations1, 3rd December 2005, St. Denis (France)

 

[2]: The boiler and the heating system markets in the EU. BRG April 2006

 

[3] UK Energy White Paper Gas Quality Exercise - Findings and Implications of Gas Appliance Testing Chris Mansfield, DTI 2006 

 

[4] Old and used gas boilers performance, tested with natural gas in the WI upper limit range, Miguel Angel Muñecas, REPSOL 2006 

 

[5] Testing boilers from the Danish market against EASEE GAS - CBP: 2005-001 gas specification. DGC 2007.

 

[6] Examples of inter-comparisons of gas boilers in LABNET:

INTERCOMPARISON GAS BOILER 1996 (REPSOL, CETIAT, DGC, ARGB, British Gas, DTI, LTG, GDF, ITALGAS, GASTEC, TNO)

INTERCOMPARISON GAS BOILER 2000 (DGC, OMV, CETIAT, TNO, ARGB, DGVW-EBI, NTUA, GASTEC, ITALGAS, SVGW, LTG)

INTERCOMPARISON GAS BOILER 2001-2003 (ARGB, CETIAT, DVGW-EBI,DGC, OMV, REPSOL,CETIAT,,DGC,GDF,GASTEC-IT, GASTEC, INig, REPSOL, KGPA)

Note that at the time this proposal is prepared, two inter-comparison tests are on-going, including all 5 laboratories here selected.

 

[7] BCR FULL AND PART LOAD EFFICIENCY MEASUREMENTS FOR BOILERS

(Contract MAT 1 - CT 92-0009) 1993-1996

 

[8] IMPROVEMENT OF INTERLABORATORY REPRODUCIBILITY FOR NOx and CO MEASUREMENTS (Contract SMT 4 – CT 95 1606) 1996-1998

 

Mandate and Call for tender

[A] “MANDATE TO CEN FOR STANDARDISATION IN THE FIELD OF GAS QUALITIES, 16 January 2007

[B] “Call for tender on Gas Quality - Phase 1 of Mandate M/400” CEN /BT WG 197

 

1.3          Potential risks with variation of gas quality

As long as new gas specifications (like e.g. EASEE GAS - CBP: 2005-001 specifications) are within the limit gases of EN 437, there should in principle be no problem for the appliances if they are respecting the actual standards and are set up in the same conditions as tested for the application of the standards or GAD. However, it appears that in many countries the appliance settings are changed during the installation or service, which means that the appliances in the field are different from the appliances tested in the laboratories. The appliances are in this case adjusted to run at the nominal input for the gas available in the grid during the installation. E.g. in Denmark, some of the appliances are adjusted with a gas having a higher Wobbe index compared to G20. In some countries (e.g. Germany) jet burners are adjusted on site during the installation phase. Finally, in many countries, appliances are also adjusted again during maintenance phases (e.g. replacement of a component).

As a result, the installed gas appliances may behave differently from the one tested and approved and today we may not know what consequence a change in Wobbe index would mean for such an appliance.

 

Also, some experts are questioning the safety of appliances when operating for long periods close to the characteristics of limit gases. For example, the boiler standard EN 483 and others are giving requirements on CO emissions. The limit adopted (0.2% CO limit on G21 - incomplete combustion limit gas) is only tested for short-term operation, the “philosophy” of the standard being that limit gas is supposed to simulate short-term abnormal situations. Therefore, an important practical question is the capability of the appliance to run safely with gas in the highest range of the Wobbe index for a long time. This is not tested in the present application of the GAD.

 

1.4          Project Objectives and Scope

The present project proposal aims to execute the study described in the Mandate [A] and call document [B] and according to the programme in 6 points as mentioned above and stipulated in the two documents.

 

a)      Short description of the mandated work (extracts of the document [A] and [B])

“The Commission hereby requests CEN to draw up standards that define the minimum range to be accepted for gas quality parameters for H-gas. The standards shall be defined according to reference conditions as recommended by the technical committee ISO TC 193 [A].”

 

“In the approach to define the standards, a distinction is made between combustion and non-combustion parameters. For the combustion parameters a testing programme on safety, efficiency and environmental impact is needed in order to define the standards”. [A]

 

Four points defined in [A] and [B] shall be covered by the study:

  • Overview of the existing population of gas appliances falling under Directive 90/396/EEC that are certified for H-gas.
  • Overview of the current certification practices.
  • Overview of the installation and inspection rules and practice.
  • Overview of the behaviour of domestic appliances (falling under Directive 90/396/EEC) in terms of safety, efficiency and environmental performance, handling different gas qualities.

 

To achieve this, the work shall be organised according to the following structure:

1)      Market study to understand the existing population. How many appliances are installed? Typology. Market for new appliances. What will be the future gas profiles (market of the gas in the future)?

2)      Existing certification practices.

3)      Installation and inspection rules and practices.

4)      Conclusion for the final test programme and final selection of appliances.

5)      Testing of appliances.

6)      Conclusions.

 

(1) (2) and (3) must be done for each country involved.

 

b) Appliances covered

As specified in the mandate, only GAD compliant appliances are included in this proposal (non-GAD appliances shall be treated at national level). Industrial applications or non-GAD appliances are not within the scope, but a number of results will also be applicable to those appliances.

 

Note that appliances covered by the GAD are both domestic and non-domestic, but as indicated in the call, only domestic appliances will be subject to testing.

 

c) Countries covered

The study is intended to cover as many EU25 countries as possible. According to the mandate [A] the goal would be to have the largest 15 gas countries and/or 75% of EU gas market. This proposal will achieve much more than 75% of the market (probably greater than 90%).

 

The call document [B] defines exactly the countries we will treat:

·          Germany

·          UK

·          Italy

·          France

·          Spain

·          Belgium

·          Poland

·          Hungary

·          Czech Republic

·          Austria

·          Slovakia

·          Denmark

·          Finland

·          Ireland

·          Portugal

·          Greece

 

d) Scope [B]

This study aims at evaluating the impact of gas quality variations on appliances certified for using gases in the H group 1. As such it shall cover all appliances complying with Directive 90/396/EEC and certified for use with gases with Wobbe (H-gases are defined by reference to EN 437:2003) index in the range of 45.7 to 54.7 MJ/m3.

 

In this entire document and all documents produced in reply to this call, energy and Wobbe index shall be expressed in Joule or multiples (MJ) based on the Gross Calorific Value of the real gas at reference conditions of 15°C, 15°C, 1013.25 hPa as stated in ISO 13443:1996-  unless specifically stated otherwise.

 

The study shall evaluate the impact of gas quality within the H group as defined in EN 437:2003 in terms of safety, efficiency and environmental performances.

 

These impacts should be evaluated as follows:

·          Within what range of gas quality (Wobbe index) are appliances certified according to Directive 90/396/EEC still fulfilling the essential safety requirements as stated in the abovementioned Directive?

·          What are the variations of efficiency and environmental performances (NOx) that can be observed within this range?

 

In line with clause 4 of article 1 of Directive 90/396/EEC, the study shall consider only ‘normally used' appliances, that is appliances correctly installed and regularly serviced in accordance with the manufacturer’s instructions and used in accordance with their intended purpose or in a way which can be reasonably foreseen. The study should evaluate on the basis of the existing appliances population complying with Directive 90/396/CE, if a range of gas quality that could be considered normal can be proposed at a European scale.

 

As a starting point the study should consider the widest range of parameters for H-group gas allowed in Europe and set up in EN 437 Wobbe index. Variations of gas quality outside the range of Wobbe index defining the H-group shall not be considered. Similarly, this study does not address the distribution of mixtures of hydrogen and natural gas.

 

1.5          Potential Impacts

The total number of gas customers (domestic, commercial and industrial) in the EU25 was 102 million in 2005 (source: Eurogas) and probably more than 150 Million gas appliances are installed in the EU25. The project will bring an answer to the impact of various scenarios of gas quality changes on safety, efficiency and emissions of those appliances covered by the GAD directive. For non-GAD appliances the study will enable the assessment of the potential risk on the basis of a theoretical approach and we will make some recommendations on how to investigate those appliances further.

The project results will allow the national and European organisations in charge to assess the costs and actions needed for the practical operation of gas quality changes to be done without risk or inconvenience for the final user.

 

The study will also allow us to conclude on some aspects of the present procedure for CE certification of gas appliances.

 

 

Document Actions