Decree of the Ministry of Industry and Trade No. 336 / 2000 Coll.
Decree of the Ministry of Industry and Trade laying down requirements for gas meters marked with EEC mark
Valid
Order
Effective from 21.04.2004
Zobrazeno prvních 200 z celkem 317 ustanovení tohoto předpisu.
Zobrazit celý předpis →
Pro stažení celého znění použijte tlačítko Stáhnout výše.
336
DECLARATION
Ministry of Industry and Trade
of 6 September 2000
laying down requirements for gas meters marked with EEC mark
The Ministry of Industry and Trade provides, pursuant to Section 27 of Act No. 505 / 1990 Coll., on Metrology, as amended by Act No. 119 / 2000 Coll., ("the Act ') for the implementation of Sections 6 (2) and 9 (1) of the Act:
This decree sets out requirements for membrane and rotary gas meters (with rotary pistons) and for non-volumetric turbine gas meters ("gas meters').
Gas meters may be marked with the EEC type-approval mark and the initial EEC verification mark, the graphic form of which is laid down in a separate legislation, (2) only if they meet the requirements set out in the Annex to this Regulation and the fulfilment of which has been verified by the procedures laid down in a separate legislation.2)
This Regulation shall enter into force on the day of the publication of the sectoral annex to the Protocol to the Europe Agreement establishing an association between the Czech Republic, of the one part, and the European Communities and their Member States, of the other part, on conformity assessment and acceptance of industrial products in the Collection of International Treaties, or on the date of the entry into force of the Treaty of Accession of the Czech Republic to the European Union, if that date is earlier.
Minister:
Doc.
Annex to Decree No 336 / 2000 Coll.
GENERAL REQUIREMENTS FOR GAS
AND DEFINITIONS OF CERTAIN CONSIDERATIONS USED IN THIS ANNEX
1. SCOPE
The range of the gas meter load is limited by the maximum flow rate Qmax and the minimum flow rate Qmin.
2. THE CYCLICAL VOLUME OF THE OBJECTIVE GAS
"Cyclic volume V volumetric gas meter 'means the volume of gas corresponding to one operating cycle of the gas meter, i.e. the total displacement of all moving parts of the gas meter at the end of which all these parts, except the counter and its transmission, return to their initial position for the first time.
This volume shall be calculated by multiplying the volume value, expressed as one full speed of the control element, by the conversion ratio of the measuring part of the meter to the counter.
3. OPERATING PRESSURE AND REFERENCE PRESSURE
3.1 Operating pressure
The operating pressure of the gas meter is the difference between the gas pressure at the gas inlet and atmospheric pressure.
3.2. Reference pressure
The reference gas gauge pressure shall be the pressure to which the measured gas volume relates.
The pressure valve for measuring the reference pressure is given in Chapter III.
_
The pressure loss of the gas meter is the difference between the pressure measured at the input and the pressure measured at the gas meter outlet during the gas flow.
5. OUTPUT-ON CONSTANT
The output drive constant is the volume value represented by the complete rotation of the shaft of the drive; This value shall be calculated by multiplying the volume value representing the complete rotation of the control element by the conversion ratio of the counter to this shaft.
B GENERAL PROVISIONS FOR GAS
1. GENERAL
1.1 Part 1 of this Annex contains general provisions which must comply with all gas meters specified in Section 1 of this Decree.
1.2 Parts two and three of this Annex contain specific provisions concerning those gas meters.
2. CONSTRUCTION
2.1. Materials
Gas meters shall be made of solid, reliable materials that have low internal stresses, little change by ageing and that are sufficiently resistant to corrosion and the effects of gases or condensates that are normally distributed.
2.2. Gas meter tightness
Gas meter bodies shall be gas-tight at maximum operating pressure.
2.3 Protection against interference
Gas meters shall be designed in such a way that any action which might alter their accuracy is not possible without damaging the verification marks and protective seals.
2.4 Direction of gas flow
The direction of gas flow through the arrow shall be indicated on gas meters whose indicator devices operate for only one direction of flow.
This arrow is not required if the direction of gas flow is determined by the design of the gas meter.
2.5 Metrological properties
For the flow rate Qmax, the gas meter shall be able to measure continuously for the period specified in Part Two or Three without changing metrological characteristics exceeding the limits specified in those Parts.
3. ADDITIONAL EQUIPMENT
3.1 Gas meters may be equipped with:
(a) advance payment facilities;
(b) built-in impulse generators whose outputs shall bear an indication of the value of one pulse in the form of:
"1 imp...... m3 (or dm3) '; or
"1 m3.......... imp. '.
These additional devices, if incorporated, form an integral part of the gas meter; it should be installed in the gas meter at the time of the initial EEC verification. There are no specific requirements as regards their effect on the measuring characteristics of gas meters.
3.2 Gas meters may be equipped with output drive shafts which should be designed to include drive shafts or other equipment to drive separable auxiliary devices. The torque that the gas meter must develop to power the additional devices with which it is equipped shall not cause any major changes in the data than specified in paragraph 5.2.1 of Part Three.
3.2.1. If the gas meter has only one propulsion shaft, it shall be provided with a "1 tr... m3 (or dm3) ', a maximum permissible torque of" Mmax =.......... N.mm' and a direction of rotation.
3.2.2. If the gas meter has several drive shafts, each shaft shall be marked in the form of a letter M with a lower index in the form "M1, M2,......., Mn," its constants in the form "1 tr........... m3 (or dm3)" and the direction of rotation.
On the gas meter, preferably on the label, the following formula shall be given:
k1M1 + k2M2 +..................... + knMn ≤ A N.mm,
in which A represents the numerical value of the maximum permissible torque applicable to the driving shaft with the highest constant where the torque applies only to that shaft; the shaft shall be characterised by the M1 symbol;
ki (i = 1; 2;.......... n) represents the numerical value determined as: ki = C1 / Ci;
Mi (i = 1; 2;.......... n) represents the torque valid for the drive shaft marked by the Mi symbol;
Ci (i = 1; 2;.......... n) represents the constant for the drive shaft marked by Mi.
3.2.3. The exposed ends of the drive shafts shall be adequately protected unless they are connected to a removable additional device.
3.2.4 The transmission between the measuring device and the intermediate transmission shall not be interrupted or altered if the torque load is equal to three times the permissible torque specified in paragraphs 3.2.1 and 3.2.2.
4. LABEL
4.1 Each gas meter shall bear the following marking either on the counter label or on a special data label or broken down on it:
(a) the EEC type-approval mark;
(b) the identification mark or name of the manufacturer;
(c) the production number and year of the gas meter;
(d) gas meter size designation: takes the form of a large G-letter with the number set out in Part Two and Part Three below;
(e) maximum flow rate expressed as: Qmax =............. m3 / h;
(f) minimum flow rate expressed as: Qmin =............. m3 / h (or dm3 / h);
(g) maximum operating pressure expressed as: pmax =............. MPa (or kPa, Pa, bar, mbar);
(h) for volume gas meters, the nominal value of the cyclical volume expressed as: V.......... (or dm3);
(i) where appropriate, the inscriptions referred to in points 3.1 and 3.2;
However, the inscriptions may be on other labels or on the gas meter itself.
These inscriptions shall be clearly visible, easily legible and indelible under normal conditions of use of the gas meter.
4.2 The Czech Metrology Institute, which issues a type-approval certificate, may decide where the label must indicate the type of gas.
4.3 The gas meter may also have a commercial mark, a special production number, the name of the gas distributor, a mark indicating that it complies with European standards, and the repair data. Any additional indication or inscription shall be prohibited unless expressly permitted.
5. COMPUTER AND CONTROL
5.1. Computer
5.1.1. The counters shall take the form of rollers; However, the last element may not comply with this requirement. Cylinders shall indicate in cubic metres or in decadent multiples or parts of cubic meters. The symbol m3 shall be indicated on the counter label.
5.1.1.1. Cylinders characterised by decadent parts of the cubic meter, if fitted, shall be clearly distinguishable from other rollers and separated from them by a clearly visible decimal point.
5.1.1.2. In cases where the last cylinder indicates decadic multiples of the cubic meter, the counter label shall bear either:
(a) one or more fixed zeros behind the last cylinder; or
(b) data "x 10, x 100, x 1000 etc." in such a way that reading is always done in cubic metres.
5.1.2. The counter shall have a number of cylinders in order to be able to indicate, within the range of one unit of the last cylinder, the volume flowing over the operating time of a thousand hours at the maximum flow rate.
5.2. Control element
5.2.1. Gas meters shall be so designed that the reading can be performed with sufficient precision. To this end, it shall have a built-in control element or device in its structure which enables the portable control element to be connected.
5.2.2. A built-in control element may be the last part of the counter in one of the following two versions:
(a) a continuously rotating cylinder with a numbered scale;
(b) a hand moving on a fixed marker with a numbered scale or a disc with a numbered scale moving behind a fixed reference mark.
5.2.3. On the numbered scales of these control elements, the value of the piece shall be clearly and unambiguously indicated in cubic metres or in decadent parts of the meter; The beginning of the scale shall be marked with a zero digit.
5.2.3.1. The length of the scale panel shall be constant throughout the scale and not less than 1 millimetre.
5.2.3.2. The value of the scale piece shall be equal to 1 x 10n, 2 x 10n or 5 x 10n m3, where n is the whole positive or negative number or zero.
5.2.3.3. The scale marks shall be sharp and uniform. In cases where the value of a piece corresponds to 1 x 10n or 2 x 10n m3, all the marks of the scale representing multiples of five, and in the case of a piece corresponding to 5 x 10n m3, all the marks of the scale representing multiples of two shall be distinguished by a greater length.
5.2.4. The indicator or reference mark shall be so thin as to allow for a certain and easy reading. The control element may have a removable reference mark sufficiently clear and large to permit photoelectric scanning. This reference mark shall not cover the division of the scale; may replace the figure 0 if necessary. It must not be a barrier to reading accuracy.
5.3 Diameters of cylinders and dials
The diameter of the cylinders shall be at least 16 millimetres.
The averages of the numbered scales referred to in paragraph 5.2.2 (b) shall be at least 32 millimetres.
5.4 Reading the counter
The counter shall be designed in such a way as to allow easy reading of the digits lined together.
5.5 Move the digits
A shift of one digit at any point of the indicator shall be completed when the digit of the nearest lower range passes through the last decimal of its path.
5.6 Removal of counter
Gas meters shall be so designed that the counter can be easily removed during the test.
6. MAXIMAL IMPORTED FISH
6.1. The measurement errors are expressed as a relative value in percentage by the ratio of the difference between the recorded volume and the actual flow volume to the actual flow volume.
6.2 These errors are related to measuring air volumes of 1,2 kg / m3. It can be assumed that under normal atmospheric conditions in the laboratory the ambient air in the laboratory complies with this condition.
6.3. Maximum permissible errors are set out in Part Two and Part Three; applies to the permitted direction of gas flow.
_
7.1 Maximum permissible values
The maximum permissible values for pressure loss are set out in Part Two and Part Three.
8. LOCATION OF VERIFICATION MARKS AND PLOMB
8.1 The position of the marks and seals shall be chosen in such a way that disassembly of the parts which are sealed by one of the seals or marks causes damage to the seal or mark.
8.2 If the inscriptions referred to in point 4.1 are marked on a separate data label and if this label is not a permanent and inseparable part of the gas meter, one of the marks or seals shall be placed so as to damage it if the special label is removed; the aim is to prevent the removal of this label.
8.3 Verification marks or seals should be placed:
(a) on all labels bearing the inscriptions required by this Annex, except labels which are a permanent and inseparable part of the gas meter;
(b) on all parts of the gas meter which cannot otherwise be protected against interference which could:
- affect or alter the display on the gas meter indicator,
- modify or interrupt the transmission between the measuring device and the counter,
- remove or replace metrologically important parts of the gas meter;
(c) to links with removable additional devices or to protective devices referred to in point 3.2.3 of Chapter I.B
9. EEC TYPE-APPROVAL AND FIRST EEC VERIFICATION
EEC type-approval 9.1
9.1.1. The application for EEC type-approval of a gas meter shall contain the following documents accompanying the submitted type:
- a description of the gas meter indicating its technical characteristics and the principle of measurement,
- a prospective display or photograph of the gas meter,
- a list of the parts describing the basic materials of those parts,
- a drawing of the assembly identifying the parts on the list,
- dimensional sketch,
- a scheme indicating the location of the verification marks and seals,
- a diagram of the indicator device with adjustment mechanisms,
- dimensional sketch of metrologically important parts,
- the layout of the counter label and the layout of the inscriptions,
- where appropriate, a plan for the additional equipment referred to in point 3.1,
- where appropriate, a table containing data on drive shafts (paragraph 3.2),
- a list of the annexed documents,
- a declaration stating explicitly that gas meters manufactured in conformity with this type comply with the safety requirements, in particular those relating to the maximum operating pressure indicated on the main label.
9.1.2. The following particulars shall appear on the EEC type-approval certificate:
- the name and address of the person for whom the EEC type-approval certificate is issued,
- the type or trade mark,
- essential technical and metrological characteristics such as minimum flow rate, maximum operating pressure, internal nominal diameter of coupling components and, in the case of volume gas meters, the nominal value of the cyclic volume,
- the EEC type-approval mark,
- the period of validity of EEC type-approval,
- in the case of gas meters equipped with drive shafts:
(a) data on the shaft referred to in point 3.2.1 of Chapter I.B (if only one drive shaft);
(b) the data on each shaft and the formula referred to in paragraph 3.2.2 (if two or more drive shafts);
- information on the location of the EEC type-approval marks, marks and seals of the initial EEC verification (photographs or drawings, where appropriate),
- a list of documents accompanying the EEC type-approval certificate,
- other special remarks.
9.2. Initial EEC verification
9.2.1 The gas meters submitted for the initial EEC verification shall be in running order.
The initial EEC verification shall not guarantee the proper operation or accuracy of the reading of the additional equipment to which points 3.1 or 3.2 apply. No EEC verification marks or seals shall be affixed to such additional equipment except those referred to in point 8.3 (c).
10. VERIFICATION MARKS AND FRUITS
10.1 Position of marks and seals
Gas meters that have successfully passed the verification tests,
- bear the marks of the initial EEC verification,
- bear EEC seals at the places referred to in point 8.3.
10.2 Purpose
The location of the marks and seals of the initial EEC verification per gas meter means that this gas meter complies with the requirements of this decree.
PROVISIONS CONCERNING MEMBRAN GAS
1. AREA OF USE
This chapter shall, together with the first part, cover gas meters in which the measured volume is measured by means of measurement chambers with deformable walls.
2. SCOPE OF MEASUREMENT AND SIZE MARKING
2.1 The following table shows the permitted maximum flow rates, the corresponding upper limit of minimum flow rates and the minimum values of cyclic volumes for the corresponding gas gauge size designation (G):
| G | Qmax m3/h | Qmin m3/h (maximální hodnota) | V dm3 (minimální hodnota) |
|---|---|---|---|
| 1,6 | 2,5 | 0,016 | 0,7 |
| 2,5 | 4 | 0,025 | 1,2 |
| 4 | 6 | 0,040 | 2,0 |
| 6 | 10 | 0,060 | 3,5 |
| 10 | 16 | 0,100 | 6,0 |
| 16 | 25 | 0,160 | 10 |
| 25 | 40 | 0,250 | 18 |
| 40 | 65 | 0,400 | 30 |
| 65 | 100 | 0,650 | 55 |
| 100 | 160 | 1,000 | 100 |
| 160 | 250 | 1,600 | 200 |
| 250 | 400 | 2,500 | 400 |
| 400 | 650 | 4,000 | 900 |
| 650 | 1000 | 6,500 | 2000 |
2.2 If, for a type of gas meter, the value of Qmin is less than that given in the table in point 2.1 of this chapter, then the figure of Qmin shall be expressed by a number from the third column of that table or as a decadent part of that heading.
2.3 Gas meters having a cyclical volume less than that specified in the table in point 2.1 of this chapter may be approved provided that the instrument sample complies with the long-term stability test requirements referred to in paragraph 7.2.5.
3. DETAILS ON CONSTRUCTION
3.1. For each gas meter, the difference between the calculated value of the cyclical volume V and the value of that volume indicated on the gas meter shall not exceed 5 per cent of the value indicated on the gas meter.
3.2 Gas meters from G 1,6 to G 6 inclusive may be equipped with a device that prevents the action of the counter if the direction of the gas flow is opposite to that specifically permitted.
4. CONTROL COMMITTEE
4.1 For gas meters from G 1,6 to G 6 inclusive, the control element is performed according to paragraph 5.2.2. of the first B. For gas meters from G 10 to G 650 inclusive, the control element is:
- either carried out in accordance with paragraph 5.2.2., Part One B,
- or it's removable.
4.2 If the control element is performed according to paragraph 5.2.2. of Part One B, the value of the scale panel and its division shall comply with the type requirements as shown in the table below:
| Velikost plynoměru | Maximální hodnota dílku stupnice | Číslováno v |
|---|---|---|
| G 1,6 až G 6 včetně | 0,2 dm3 | 1 dm3 |
| G 10 až G 65 včetně | 2 dm3 | 10 dm3 |
| G 100 až G 650 včetně | 20 dm3 | 100 dm3 |
4.3. For gas meters the control element of which is performed in accordance with paragraph 5.2.2., Part One B, the typical deviation of a series of at least 30 consecutive measurements of the volume of air determined below, carried out at 0,1 Qmax and under the same conditions, shall exceed the values of the following table:
| Velikost plynoměru | Objem vzduchu k měření | Maximální dovolená typická odchylka |
|---|---|---|
| G 1,6 až G 4 včetně | 20 V | 0,2 dm3 |
| G 6 | 10 V | 0,2 dm3 |
| G 10 až G 65 včetně | 10 V | 2 dm3 |
| G 100 až G 650 včetně | 5 V | 20 dm3 |
The volume of air to be measured may be replaced by a volume approximately equal to the total speed of the control element.
5. MAXIMAL IMPORTED FISH
5.1 General provisions
5.1.1 Maximum permitted positive and negative errors are given in the table below:
| Průtok Q | Maximální dovolená chyba při prvotním EHS ověření |
|---|---|
| Qmin ≤ Q < 2Qmin | 3 % |
| 2 Qmin ≤ Q ≤ Qmax | 2 % |
5.1.2. If all gas meter errors at flows from 2Qmin to Qmax have the same sign, the initial EEC verification shall not exceed 1%.
5.2. Specific provisions
5.2.1. If the drive shafts are loaded with the maximum torque indicated on the gas meter and corresponding to points 3.2.1 or 3.2.2, the meter reading at Qmin shall not deviate by more than 1,5%, regardless of paragraph 6.3.2.
Sign in for notes, favorites and notifications
Regulation Information
| Citation | Decree of the Ministry of Industry and Trade No. 336 / 2000 Coll., laying down requirements for gas meters marked with EEC mark |
|---|---|
| Regulation Type | Order |
| Author | - |
| Collection | Code of Laws |
| Date of Promulgation | 26.09.2000 |
|---|---|
| Effective from | 21.04.2004 |
| Effective until | - |
| Status | Valid |
The regulation text is for informational purposes only.
Comments 0