Natural gas quality

MINIMUMUM REQUIREMENTS FOR NATURAL GAS QUALITY

According to Annex no. 5 of the Regulation for metering the natural gas quantities traded in Romania (updated on 30.06.2011) the table below displays the minimum requirements for the quality of the natural gas traded in the entry/exit points in/from the NTS:

1. The chemical composition of natural gas:


Name and chemical formula of the components 

Molar content %

metdane (C1)

minimum 70

etdane (C2)

maximum 10

propane (C3)

maximum 3,5

butane (C4)

maximum 1,5

pentane (C5)

maximum 0,5

hexane(C6)

maximum 0,1

heptane (C7)

maximum 0,05

octane (C8) and higher hydrocarbons (C9)

maximum 0,05

nitrogen(N2)

maximum 10

carbon dioxide(CO2)

maximum 8

oxygen (O2)

maximum 0,02

hydrogen sulfide (H2S)

maximum 6,8 mg/m3

etilmercaptan (C2H5SH)1

minimum 8 mg/m3

Total sulphur in a short period

maximum 100 mg/m3

2. Water dew point (°C): maximum -15°C, at the pressure in the 2 commercial delivery/take over point;
3. Hydrocarbon dew point  (°C): maximum 0°C, at the pressure in the 3 commercial delivery/take over point;
4. The minimum accepted value of the gross calorific value assigned at the volume is 7.840 Kcal/m3;
5. The maximum accepted natural gas temperature: 50°C;
6. Content of tde mechanical contaminants (g/m3): maximum 0,05;

Note:
1 Except for the gas delivered for chemicalization, their odorization degree is agreed mutually.
2 Except for the natural gas delivered to the consumers connected directly to the collector pipelines upstream.
3 Except for the natural gas delivered to the consumers connected directly to the collector pipelines upstream.

Additional information regarding the rights and obligations of the economic agents on the natural gas market in Romania as for metering and converting the natural gas quantities in energy units are available in the ( Regulation for metering the natural gas quantities traded in Romania (updated on 30.06.2011 ) (available only in Romanian language)

THE RIGHTS AND OBLIGATIONS OF THE NETWORK USER  

Regarding the quality conditions of the natural gas traded and respectively of the pressure requirements in the entry/exit points in/from the NTS based on the transmission framework contract.

According to Chapter 5 Natural gas Quality in the transmission framework contract the natural gas traded in the entry/exit points in/from the NTS must comply witd the quality conditions stipulated in the minimum quality conditions above.

According to art. 6-9, 14 and 16 of the natural gas transmission framework contract, the rights and obligations of the network user as for the gas quality conditions are the following:

Network user

Right

To refuse to take over the off-spec gas at the NTS exit points

Obligation

To deliver gas at the NTS entry points in compliance with the natural gas quality conditions:

To accept a temporary reduction of the approved capacity and nomination/renomination in the NTS entry point if the gas quality conditions and/or pressures are not met;

Costs

To require and receive an amount equal to 0,5% of the value of the natural gas expressed in energy units delivered at the exit from the NTS and which display the minimum conditions of the quality conditions, calculated by multiplying tde natural gas quantities expressed in energy units, noted in tde minutes concluded at tde exit from tde NTS, according to tde period in which it did not comply witd tde quality conditions, with the fixed unit amount to cover the natural gas purchasing price, expressed in RON/ energy units, evaluated by the NERA in that period;

Botd tde annual average gross calorific value (calculated as a weighted average with the natural gas volumes of the gross calorific values in the previous calendar year for every point considered) as well as the pressure requirements (maximum and minimum pressures) relevant for the access to the system are published for every relevant point at here