Deliverable D1 is a literature study of the impact of renewable gases on the accuracy and durability of gas flow meters. The literature has been gathered from public documents and a survey from gas R&D institutes, TSOs, DSOs, laboratories and/or manufacturers and others.
The turnout of this survey is described for each of the gases (syngas, Hydrogen, biogas, raw biogas and biomethane) and can be found at the link below.
Deliverable D2 is defining an acceptable range of gas compositions for each renewable gas family that matches current production capabilities, available technical capabilities and actual needs. The documents can be found in the link below.
Deliverable D3 is defining the tests that have already been performed for each meter technology, and renewable gas family/gas compositions by using the literature survey from D1. By using these tests, it can be concluded for each gas meter technology which gas compositions that never have been tested. The conclusion may in turn help to define, which gas compositions (belonging to the gas composition ranges listed in D2) that never have been sufficiently tested and which need to be tested (and the impact will be analysed). The documents can be found in the link below.
Statement to the Deliverable D3
Deliverable D4 is a report that summarize the recommendations made for different gas meters for the traceable calibration and verification procedures in compliance with the requirements on the Measuring Instrument directive 2014/32/EU.
it also includes recommendations on the test gases, flow rates, pressure range and meter sizes. Finally the report also include the effect of renewable gases on the uncertainty budgets of gas meters.
Deliverable D5 is a report describing the durability of the materials, electrical insulation and internal components of domestic gas meters after exposure to renewable gases.
The deliverable also report the results found on the effects that renewable gas flow has on the durability of gas meters and how this effects their accuracy, and finally recommendations for improving current calibration and verification facilities.
D5 – report on the durability
Deliverable D6 is a report describing an inter-comparison for renewable gases. This includes measurements with hydrogen, nitrogen, methane and air. The flow rate ranges covered by this inter-comparison are 25 l/h up to 9,000 l/h, which are commonly used flow rates of domestic gas meters. The aim of this pilot study was to develop a robust flow transfer calibration standard which can be used for inter-comparisons measurements with renewable gases. The transfer-packages were designed as two instruments for redundancy.
Deliverable D7 is a report describing the investigation of the applicability of currently available flow calibration standards (or test benches respectively) for testing the accuracy of gas meters with hydrogen and/or hydrogen-enriched natural gas (HENG). In this task, domestic gas meters have been tested with air and hydrogen gas flows with two different flow meter types using critical nozzles or rotary meter as references. Tests have also been performed with a rotary gas meter at elevated pressure (9 and 16 bar) with HENG using a piston prover. This document summarizes all performed tests and results.