Decree of the Ministry of Industry and Trade No. 22 / 2001 Coll.
Decree of the Ministry of Industry and Trade laying down requirements for measuring systems for liquids other than water labelled with EEC mark
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22
DECLARATION
Ministry of Industry and Trade
of 13 December 2000
laying down requirements for measuring systems for liquids other than water labelled 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 measurement systems for liquids other than water containing volumetric flow meters in which the fluid causes the motion of the moving walls of the measuring chambers. The measuring system for liquids includes its own measuring instrument, additional devices that may be associated with it, all equipment necessary to ensure accurate measurement and any equipment that has been added mainly to facilitate operation.
The measuring systems for liquids other than water may be marked with the EEC type-approval mark and EEC initial verification mark instead of the official marks provided for in the separate legislature1 only if they comply with the requirements laid down in the Annex to this Regulation and those laid down in the specific legislature.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 22 / 2001 Coll.
Requirements for measuring systems for liquids other than water
1. GENERAL REQUIREMENTS FOR MEASURING SYSTEMS
1.1 Definitions
1.1.1. Measurement system
The measuring system for liquids other than water shall consist of, in addition to the measuring instrument itself corresponding to the special regulatory regulation (3) and the auxiliary device corresponding to the special legislative regulation (3), which may be associated with that measuring instrument, all devices used to ensure accurate measurement or to facilitate measuring operations and any other devices which may influence measurement in any way. If several measuring instruments intended for separate measurement operations work in conjunction with common components, then each measuring instrument with common components shall be considered as a measuring system. If several measuring instruments are intended for one measuring action, these measuring instruments shall be considered as a single measuring system.
1.1.2. Minimum measurement and minimum sampling
The minimum measurement system dimension shall be determined according to the requirements of the Special Legislation (3), taking into account the measures of this Decree. In the case of measuring systems intended to measure the collection of liquid, the smallest volume of the liquid for which the measurement was allowed shall be called the smallest sample. The above requirement, which applies to the smallest measurement, is used analogously for the smallest sampling.
1.1.3. Gas separator
A gas separator is a device for continuous separation and removal of air or gases contained in the liquid. The gas extraction device works automatically. However, this requirement may be waived if a mechanism is available that automatically stops the flow of liquid at the risk of air or gases entering the meter. In this case, measurements can only be resumed when the air or gas is removed, either automatically or manually.
1.1.4. Air pump
The radiator is a device designed to remove air or gases that are only slightly mixed with the liquid accumulated in the pipe in front of the gauge in the form of pockets. The above requirements concerning the gas removal equipment for the gas separator shall also apply to the evaporator.
1.1.5. Special aeration device
A special aeration device is a device which, like a gas separator, but under less stringent operating conditions, continuously removes the air or gases contained in the liquid and automatically stops the flow of liquid at the risk of entering the accumulated air or gases which are only slightly mixed with the liquid, in the form of pockets into the gauge.
1.1.6 Condenser
The capacitor is a closed tank which, for liquefied gas pressure measuring devices, serves to collect and condense the gases contained in the measured liquid before measuring.
1.1.7 Gas indicator
The gas indicator is a device enabling the easy detection of air or gas bubbles that may be present in the flow of liquid.
1.1.8 View
The transparent is a device for checking the filling rate of the system with liquid.
1.2 Application of requirements
Specific requirements are set out in point 2 for certain types of measuring systems.
1.3 Measurements, flow limits
The gauges included in the measuring system, including all auxiliary equipment, shall pass EEC type-approval for the measurement of the relevant liquid under normal operating conditions. Such measuring instruments shall be submitted to a separate EEC type-approval or approved as part of the EEC type-approval of the measuring system of which they are part. The flow limits (maximum and minimum flow rates) in the measuring system may differ from the flow limits of the meter connected to it. In such cases, it shall be verified that the maximum and minimum flow rates in the measuring system are compatible with these values for the measuring instrument. In any case, even if the measuring instrument has been approved as a component incorporated into the measuring system, it shall comply with the requirements of the specific legislation. 3) Where several measuring instruments are connected in parallel in one measuring system, the sum of the maximum and minimum flow rates of measuring instruments shall be taken into account when determining the flow limits of the whole system, except in the specific cases specified in this Annex. The maximum flow rate in the measuring system shall be at least twice the total minimum flow rate of its measuring instrument or measuring instruments.
1.4 Transfer point
1.4.1 Measurement systems shall include a point which defines the quantity of liquid issued or received and which is called the point of transmission. The transfer point shall be located behind the meter at the outlet or before the meter at the sampling devices.
1.4.2 Measurement systems may be of two types: empty hose systems and full hose systems. The term "hose 'includes fixed pipes.
1.4.2.1. The empty hose systems are measuring systems for dispensing devices where the transfer point is located before the discharge hose. The transfer point shall either take the form of an overflow with a transparent or closing device, in both cases combined with a system which, after each measurement, ensures that the outlet hose is emptied.
1.4.2.2. Full hose systems are measuring systems for dispensers whose point of transmission consists of a closing device located on the discharge manifold. Where the pipe has an open end, the closing device shall be placed as close as possible to that end.
1.4.2.3. In the case of a sampling device, these requirements shall apply by analogy to the supply lines placed in front of the measuring instrument.
1.5 Filters
The measuring systems include easily accessible filters placed in front of the measuring instrument, which are used to collect solid impurities from liquids.
1.6. Separation of air or gases
1.6.1 General requirements
The measuring systems shall be installed in such a way as to prevent the entry of air or the release of gases into the liquid in front of the gauge while maintaining normal operating conditions. Otherwise, the measuring system shall be supplemented with a gas separation device allowing the removal of air or undissolved gases present in the liquid prior to its passage through the measuring instrument. The gas separation device shall be suitable for batch conditions and shall be carried out in such a way that the additional error in the measurement results caused by air or gases does not exceed:
- 0,5% of the measured quantity of liquids, excluding drinking liquids, of a dynamic viscosity not exceeding 1 mPa.s,
- 1% of the measured quantity of drinking liquids and liquids with a dynamic viscosity greater than 1 mPa.s.
However, errors less than 1% of the smallest margin need not be taken into account.
1.6.2 Operation with pump
1.6.2.1. If the pressure at the pump inlet can, even for a moment, fall below the atmospheric or saturated vapour pressure of the liquid, the gas separator shall be provided as specified in paragraph 1.6.6.
1.6.2.1.1. A gas separator intended to operate at a maximum flow rate not exceeding 100 m3.h-1 may be subjected either to separate EEC type-approval or to an approval included in the EEC type-approval procedure for a given measuring system of which it is part, where this Annex requires the approval of such a system. However, in the case of gas separators intended for operation at a maximum flow rate of more than 100 m3.h-1, type approval may be granted by analogy with an approved type of the same design and smaller dimensions. Gas separators which have received separate EEC type-approval may be used in measuring systems without a gas indicator.
1.6.2.1.2. The gas separator shall be installed behind the pump. It shall always be placed as close as possible to the gauge so that the drop in pressure caused by the flow of liquid between the two devices is negligible; The gas separator may also be connected to the pump.
1.6.2.1.3. The operating limits of the gas separators shall be as follows:
(a) maximum flow or flow rates for one or more specified liquids;
(b) maximum and minimum pressure limits compatible with the correct operation of the gas separation installation.
1.6.2.1.4. The gas separator intended to operate at a maximum flow rate not exceeding 100 m3.h-1 and subject to separate EEC type-approval shall ensure, within the limits of the errors set out in paragraph 1.6.1, the separation of air or gases mixed with the measured liquid under the following test conditions:
(a) the measuring system shall be in operation at its maximum flow rate and at the minimum pressure specified for the gas separator;
(b) any ratio of air or gas volume to liquid is permitted if the gas separator is intended for a maximum flow rate equal to or less than 20 m3.h-1. It shall be limited to 30% if the gas separator is intended for a maximum flow rate greater than 20 m3.h-1. (Air or gases shall be measured under atmospheric pressure to determine their proportion).
The self-contained gas disposal equipment shall operate correctly even at the maximum pressure specified for these gas separators.
1.6.2.1.5. Where a gas separator is approved as part of an approved measuring system, the provisions of paragraph 1.6.2.1.4 may be applied to it. In this case, no gas indicator is required. If the measuring system contains a gas indicator, the gas separator shall, within the limits of the errors set out in point 1.6.1, ensure the separation of air or gases mixed with the measured liquid under the following conditions:
(a) the measuring system shall operate at its maximum flow rate and minimum pressure;
(b) the ratio of air or gas volume to liquid shall not exceed:
- 20% for liquids, excluding drinking liquids, of a dynamic viscosity not exceeding 1 mPa.s,
- 10% for drinking liquids and other liquids with a dynamic viscosity exceeding 1 mPa.s.
The requirement in points (a) and (b) is generally met when the effective volume of the separator is at least 8% of the volume of delivery per minute at the maximum flow rate indicated on the measuring system label. If the air or gas volume / liquid ratio is greater than the above percentages and the gas separator does not meet the requirements for maximum permissible errors, then the gas or air bubbles shall be clearly visible in the gas indicator.
1.6.2.2. When the pressure at the pump inlet is continuously higher than the atmospheric pressure and the saturated vapour pressure of the liquid, and no gas separator is available, an aeration device or special aeration device is required if the likelihood of gas formation between the pump and the measuring apparatus is at a time when no flow rate is present or if air pockets (e.g. in an empty supply tank) arrive in the pipe and cause a specific error exceeding 1% of the smallest margin.
1.6.2.2.1. A ventilator or a special ventilator intended for use in a flow-through quantity not exceeding 100 m3.h-1 may be approved either under separate EEC type-approval or under EEC type-approval for the measuring system of which it is part, provided that the Annex provides for arrangements for the approval of that system. However, if the ventilator is intended to operate at a maximum flow rate of more than 100 m3.h-1, then type-approval may be granted on the basis of the procedure contained in the approval of the same design and of smaller dimensions. Air conditioners and special air conditioners which have obtained separate EEC type-approval may be used in measuring systems without gas indicators.
1.6.2.2.2. In principle, the aero or special aero must be installed behind the pump. However, it may be connected to the pump. In both cases it shall be installed at the highest point of the piping system in front of the gauge and as close as possible to the gauge. If installed below the gauge, it shall contain a return valve, if necessary with a reduction valve, to prevent the discharge of the line between the valve and the gauge. If the piping system has several elevated points in front of the gauge, several air conditioners may be required.
1.6.2.2.3. For the operating limits of the aeration or special aeration, paragraph 1.6.2.1.3 shall apply mutatis mutandis, including the smallest margin for which the equipment is designed.
1.6.2.2.4. At the maximum flow through the measuring system, the ventilator or special ventilator shall ensure the separation of gases or air measured at atmospheric pressure at least equal to the smallest rate, without any additional error exceeding 1 per cent of the minimum rate. In addition, a specific aero shall be capable of continuously removing the volume of gases or air equal to 5% of the volume of the liquid supplied at the maximum flow rate, without resulting in another error exceeding the limits set out in paragraph 1.6.1.
1.6.2.3. The requirements of paragraphs 1.6.2.1 and 1.6.2.2 shall not prevent the existence of hand or automatic air-breakers in fixed installations of large dimensions.
1.6.2.4. If the fluid supply is arranged in such a way that no gas or air is formed under any conditions and no external gas or air is penetrated when measured in the supply line before the gauge, no gas separation device shall be required, provided that the possibility of generating gaseous formation at a time without flow does not cause a specific error greater than 1 per cent of the smallest margin.
1.6.3 Operation without pump
1.6.3.1. In cases where the gauge is filled with self-setting without the use of the pump and where the pressure of the liquid in all parts of the pipe before and in the own measuring device is greater than that of the saturated vapour of the liquid and atmospheric pressure, the gas separator is not needed. However, when the measuring system is put into service, it is necessary to ensure that the system is always properly filled.
1.6.3.2. If the pressure of the liquid is less than the atmospheric pressure but remains greater than the pressure of saturated vapours, the penetration of the air into the gauge shall be avoided.
1.6.3.3 If the gauge is filled with gas pressure, the gas penetration into the gauge shall be avoided.
1.6.3.4. The pressure of the liquid between the gauge and the point of transmission shall always be higher than the pressure of the saturated vapour fluid.
1.6.4. Gas discharge
The exhaust pipe from the gas separator shall not contain a manually operated valve if the closure of that valve prevents the operation of the gas separator. If such a closure device is required for safety reasons, it shall be installed only with a seal enabling it to be secured in an open position.
1.6.5. Anti-vortex equipment
If the supply tank of the measuring system is expected to be completely emptied, then the discharge hole of the tank shall be fitted with an anti-vortex device, except where the system contains a gas separator.
1.6.6. Viscous liquid
As the efficiency of gas separators and air-breakers decreases with the increase in the viscosity of the liquid, these devices may not be installed for liquids with a dynamic viscosity greater than 20 mPa.s at 20 ° C. The pump shall be so arranged that the input pressure is always greater than the atmospheric pressure. If this condition cannot be met in all circumstances, a device shall be installed which automatically stops the flow of the liquid as soon as the inlet pressure falls below atmospheric pressure. The pressure gauge shall be used to monitor this pressure. These conditions do not need to be met if the measuring system contains a device to ensure that no air penetrates the connections in the sections of the piping with lower pressure. When the measuring system is out of operation, the pipe shall remain filled with liquid to the point of transmission.
1.7 Gas indicator
1.7.1 The measuring system may be equipped with a gas indicator. Such facilities may be mandatory in the cases referred to in point 2.
1.7.2 The gas indicator shall be designed to provide satisfactory information on the presence of gases or air in the liquid.
1.7.3 The gas indicator shall be installed behind the gauge.
1.7.4. In measurement systems with an empty hose, the gas indicator may take the form of a transparent display and may also be used as a transfer point.
1.7.5. The gas indicator may be equipped with an air screw or other exhaust device, if it is an increased point in the pipe system. No pipe shall be attached to the ventilation device. The gas indicator may include flow indicators (e.g. spirals) unless such devices prevent the visibility of the gas formations that may be present in the liquid.
1.8 Full filling of the measuring system
1.8.1 The gauge and pipe from the gauge to the point of transmission shall be automatically maintained in full condition both during and out of operation. If this condition is not met, especially in the case of fixed installation, the full filling of the measuring system up to the point of transmission shall be possible manually and monitored during the measurement and in the absence of operation. In order to ensure the complete removal of air and gas from the measuring system, the appropriate locations need to be fitted with exhaust devices, preferably equipped with small transparent devices.
1.8.2 In general, the tube between the gauge and the point of transmission shall not cause additional errors which would be greater than 1 per cent of the smallest margin due to temperature changes. Point 2 lays down the technical conditions which must be met in certain specific cases in order to comply with this requirement.
1.8.3. If necessary, a pressure-retention device shall be installed behind the gauge to ensure that the pressure in the gas separators and in the gauge is always greater than the atmospheric pressure and pressure of saturated vapour fluid.
1.8.4 Measurement systems for which there is a possibility of fluid flow in the opposite direction to normal flow when stopping the pump shall be provided with a return valve equipped with a pressure limiter if necessary.
1.8.5 In the case of measuring systems with an empty hose, the line behind the gauge and, if necessary, the line before the gauge shall have an increased point so that all parts of the measuring system remain permanently filled with liquid. The discharge hose discharge specified in paragraph 1.4.2.1 shall be provided by an air valve. In certain cases, this air valve may be replaced by specific devices such as an auxiliary pump or compressed air injector. In measuring systems designed for the smallest measuring range of less than 10 m3, these devices shall operate automatically.
1.8.6. For full hose measuring systems, the free end of the pipe shall include a device to ensure that the hose cannot be emptied when the system is not used. This requirement may not be met for liquefied gases. If the closing device is installed behind that device, the volume between them shall be as small as possible and shall always be less than the maximum permissible error for the smallest measurement system measurement range. If the system is designed to measure viscous liquids, the end of the nozzle shall be so designed that it cannot hold the amount of liquid greater than 0,4 times the maximum permissible error for the smallest measuring system measurement.
1.8.7. If the hose consists of several parts, these parts shall be connected either by a special coupling to maintain the hose fully or by means of a coupling mechanism which is either sealed or which ensures that parts cannot be separated without the use of special tools.
1.9 Changes in internal volume of full hose
If the full hose in the measuring system is fitted with a retractable drum, the increase in the inner volume of the hose due to the change from the retractable position where the hose is not under pressure to the developed position where the hose is under pressure but without the flow of liquid, shall not exceed twice the maximum permissible error for the smallest measurement. If the measuring system is not equipped with a retractor drum, the growth of the internal volume shall not exceed the maximum permissible error for the smallest measurement.
1.10 Blocks
1.10.1. In the case of measuring systems intended for the dispensing of liquids, digress after the gauge may be approved only if they are arranged in such a way that only one piping is possible. In the case of measuring systems intended for the intake of liquids, divergences in front of the gauge may be allowed only if they are arranged in such a way that only one line is possible at a given time. Derogations from these requirements may be approved in the case of dispensing systems which supply only one customer and in the case of sampling facilities which cannot work for more than one supplier simultaneously.
1.10.2. For measuring systems operated either with an empty hose or with a full hose and with flexible pipes, a return valve shall be installed, if necessary, on a fixed line leading to a full hose immediately behind a multi-road valve. The multi-way valve shall not in any position permit the connection of an outlet hose operating as an empty hose with a pipe leading to a full hose.
1.11 Circular piping
Any connection intended to circumvent the gauge shall be closed by means of blind flanges. If operational requirements require the use of a bypass, this bypass shall be closed either by a blinding plate or by a double valve closure between them. It shall be possible to ensure closure by means of seals.
1.12 Valves and control mechanisms
1.12.1 If the supply conditions threaten to overload the gauge, a flow limiting device shall be installed. If this device causes a drop in pressure, it shall be placed behind the gauge. It must be possible to seal it.
1.12.2. The different settings of the multi-road valve shall be easily visible and reinsurance by means of screws, stops or other means of locking. Derogations from this requirement are possible if the adjacent positions of the control lever are at an angle of 90 ° or greater.
1.12.3. Reverse valves and closing mechanisms which are not intended to limit the quantity to be measured shall, if necessary, have an insurance valve to reduce the increased pressure that could arise in the measuring system.
1.13 Arrangements of measuring systems
The measuring system shall be installed in such a way that the indicator device is clearly visible under normal operating conditions. The indicator device and the gas indicator, if any, shall be observable from one location as far as possible. The sealing points shall be easily accessible, the labels shall be affixed indelibly and the prescribed inscriptions shall be clearly legible and indelible.
1.14. In-service verification
The measuring system shall allow verification in accordance with point 3.2. If necessary, a pipeline shall be installed to return the measured liquid to the supply tank. The measuring system shall be equipped with temperature and pressure measuring points where necessary, in particular when the operation or verification of measuring instruments requires knowledge of these quantities.
1.15 Characteristics of the measuring system
The characteristics of the measuring system are as follows:
- maximum and minimum flow rate,
- maximum operating pressure,
- minimum operating pressure, if necessary,
- the measured liquid or liquid and the kinematic or dynamic viscosity limits where the marking of the type of liquid is not sufficient to determine its viscosity,
- the smallest measurement,
- temperature range if the liquid can be measured below -10 ° C or above + 50 ° C.
1.16 Labelling
The measuring system, part of it or subassembly to which approval has been granted shall bear the following clearly legible and unremovable data, either near the indicator of the indicator device or on a separate descriptive label:
(a) the EEC type-approval mark,
(b) the identification mark or on behalf of the manufacturer;
(c) where applicable, another type designation from the manufacturer;
(d) the production number and year of manufacture;
(e) information on the characteristics of the measuring system as defined in point 1.15;
(f) other additional particulars specified in the type-approval certificate.
If several gauges operate in a single system using common devices, then a single label may bear the marking required for each part of the system.
The marking on the indicator device of the measuring instrument shall not conflict with the label of the measuring system.
If the measuring system can be transported without being dismantled, the marking for each part may be combined on a single label.
1.17 Fillings
The sealing shall preferably be carried out by embossed lead fillings. However, for fragile devices or where seals are adequately protected against accidental breakage, pliers are permitted to be sealed. In any case, seals shall be easily accessible. It shall be possible to place the seals on all parts of the measuring system which cannot be otherwise protected against changes which could affect the accuracy of the measurement. However, seals may not be on connections which can only be dismantled using tools. The seals shall be adjusted to allow the marking of the EEC sub-initial verification. It shall be possible to seal the sealing plate referred to in paragraph 3.3.2.1 of Annex 2 to the Specific Legislative Regulation (2) on the design of the measuring system. It may be combined with the marking of the measuring system referred to in paragraph 1.16. In the case of a drinking liquid measuring system, seals shall not be fixed so that the system can be dismantled for cleaning purposes.
2. SPECIFIC REQUIREMENTS FOR MISCELLANEOUS SPECIES OF MEASURING SYSTEMS
2.1. Liquid fuel dispensers
2.1.1. Liquid fuel dispensers are measuring systems designed to supply liquid fuels to the fuel tanks of road vehicles. The measurement systems used for fuelling motor boats and small aircraft shall be treated as liquid fuel dispensers. They may contain their own supply system or may be intended for installation within the central supply system. The ratio between the maximum and minimum flows of these systems shall be at least 10: 1.
2.1.2 Where the measuring system has its own supply system, a gas separator shall be installed immediately before entering the meter. This gas separator shall meet the conditions specified in paragraph 1.6.2.1.4 or 1.6.2.1.5. In the case of separators meeting the conditions set out in point 1.6.2.1.5, experience shows that the requirement is generally met when the effective volume of the separator is at least 5% of the volume of delivery per minute at the maximum flow rate indicated on the meter label. In the latter case, the ventilation equipment referred to in point 1.7.5 is not permitted.
2.1.3. If the measurement system is intended to be installed in a central supply system or for remote fuelling, the general rules referred to in point 1.6 shall apply.
2.1.4. The liquid fuel dispensers shall be equipped with a zero-capacity counter device as well as a total-capacity counter. If these systems also contain a price indicator, this indicator shall also be equipped with a zero-level device. The charging device of the price indicator and the volume counter shall be installed in such a way that the zeroing of one of the two indicators automatically zero the other indicator.
2.1.5. If the metering system has its own electrical supply system, it shall be equipped with a device to prevent the flow of liquid after the engine has stopped until the counter has been zeroed. In no case shall it be possible to zero the counter during the output.
2.1.6. The return valve referred to in point 1.8.4 is mandatory. It shall be installed between the gas separator and the gauge. However, it may be placed behind the gauge if the gas separator is placed above the gauge. In this case it may be combined with the equipment referred to in paragraph 1.8.3. Where the return valve is installed between the gas separator and the meter, the resulting pressure loss shall be so low that it can be neglected.
2.1.7 For full hose measuring systems, the hose shall contain a manual closing mechanism which meets the requirements of paragraph 1.8.6. In addition, a self-locking mechanism may be installed. The full hose measurement systems supplied only by a manual pump need only the closing mechanism specified in paragraph 1.8.6.
2.1.8 Measurement systems with a maximum flow rate of 60 l / min or less shall have a minimum range of not more than 5 litres.
2.1.9. If the measuring system is equipped with a ticket printer, the printer shall be connected to the zero device. The loading device must enable the print to be checked by comparing the ticket with the indicator after printing.
2.1.10. In accordance with point 3.2, initial verification of the measurement systems for liquid fuels shall be carried out in one or two stages depending on whether they have or do not have their own supply system.
2.2 Measurement systems for low viscosity road tanks (dynamic viscosity ≤ 20 mPa.s), stored at atmospheric pressure, excluding drinking liquids
2.2.1. The requirements of paragraph 2.2 shall apply to measuring systems on road tanks or transportable tanks. The measuring systems may be mounted on road tanks containing one or more chambers, each chamber being equipped with its own shut-off valve, operated manually or automatically.
2.2.2. Each measuring system shall be used for a particular product or category of products for which EEC type-approval has been granted to the measuring instrument. The tube shall be designed so that mixing of the products can be easily prevented.
2.2.3. If tanks are installed on trailers or semi-trailers, the measuring system may be mounted either on a tractor or on a trailer or on a semi-trailer.
2.2.4 The measuring system installed on the road tank can be either with an empty hose or with a full hose. It may also have one empty hose and one full hose, or two full hoses of different dimensions, arranged so that they can be operated alternately. It shall not be possible to switch to another hose during the measurement.
2.2.5. If the measuring instrument is connected to the ticket printer, the printer shall be connected to the zero device of the volume counter.
2.2.6 The measuring system attached to the road tanker shall be so set as to be supplied only with the pump, only by self-falling, pump or self-falling, or only by pressure of gases.
2.2.6.1. Only pump-supplied measurement systems can operate as full hose systems or empty hose systems.
2.2.6.1.1. In the event that the condition set out in paragraph 1.6.2.4 is not met, the gas separator shall be pressurised to the gauge, for example:
(a) an appropriate gas separator that meets the requirements of 1.6.2.1.4 or 1.6.2.1.5; for separators that comply with the requirements of 1.6.2.1.5, experience shows that the requirement is generally met when the effective volume of the separator is at least 5% of the delivery volume per minute at the maximum flow rate in the measuring system;
(b) an aeration device;
(c) a special aeration device.
If atmospheric pressure could drop at the outlet of the measuring instrument in the measuring system, but would remain higher than the saturated vapour pressure of the measured liquid, these devices shall be combined with an automatic device that slows or stops the flow of the liquid to prevent air entering the meter. If there is no risk of a drop in pressure on the outlet from the gauge below atmospheric pressure (which is particularly true for systems operated with a full hose), it is not necessary to require automatic devices to slow or stop the flow of liquid.
2.2.6.1.2. The special air conditioner with automatic stopping device shall be equipped with a transparent device.
2.2.6.1.3. Road tanker chambers shall be equipped with anti-vortex equipment, except where the measuring system is equipped with a gas separator complying with the requirements of paragraph 1.6.2.1.4.
2.2.6.2 The measurement systems supplied only by self-fall shall meet the following requirements:
2.2.6.2.1. The device shall be so designed that the total volume of one or more chambers can be measured at a flow rate greater than or equal to the minimum flow rate in the measuring system.
2.2.6.2.2. If the connection to the gaseous phase is in the tank, the appropriate device shall prevent gas entering the meter.
2.2.6.2.3. The tank chambers shall be adapted to the anti-vortex device, except when the measuring system has a gas separator in accordance with paragraph 1.6.2.1.4.
2.2.6.2.4. The requirements of paragraphs 1.6.3.1, 1.6.3.2 and 1.6.3.4 shall be met. If the above requirements are met, an accelerator pump may be used beyond the point of transmission. However, this pump shall not cause the pressure in the gauge to drop.
2.2.6.2.5. For certain measurement systems, in particular those with a special aeration device with a mechanism for self-stopping the flow, and for those with permanent aeration to the atmosphere located immediately beyond the point of transmission, a gas indicator is not required. In the case of systems with manual ventilation located immediately behind the point of transmission, the gas indicator shall be mandatory, except for systems where the pressure cannot fall below atmospheric pressure.
2.2.6.3. Measurement systems which can be operated either with a pump or with self-setting shall comply with the requirements of paragraphs 2.2.6.1 and 2.2.6.2.
2.2.6.4 The measurement systems supplied with gas pressure may be operated either as empty hose systems or as full hose systems. A pipe connecting a device which prevents the gases from entering the gauge as specified in paragraph 1.6.3.3 above and the gauge itself shall not contain any narrowing or component which could cause a drop in the pressure at which gaseous formation is generated by the release of gases dissolved in the liquid. Such systems shall contain a pressure gauge showing the pressure within the tank. The permissible pressure zone shall be indicated on the pressure gauge.
2.3 Collection facilities for the discharge of marine, rail and road tankers
2.3.1 Measurement systems for measuring the volume of liquids in sea, rail and road tanks shall contain an inserted container in which the liquid level determines the point of transmission. This input can also be used for the separation of gases.
2.3.1.1. In the case of railway and road tankers, the inset vessel shall maintain a permanent level visible or otherwise detectable at the start and end of the measurement operation. The permitted variation of the steady state shall be equal to a volume not greater than the maximum permissible error for the smallest sampling.
2.3.1.2. There is no need for self-maintenance measures for marine tanks. In this case, the variation in content shall be measurable. If the ship's tank is emptied by pumps located at the bottom of the ship, the container inserted shall only be used at the start and end of the intake.
2.3.1.3. In both the cases referred to in paragraphs 2.3.1.1 and 2.3.1.2 above, the cross-section of the container inserted shall be such that the amount of liquid equivalent to the maximum permissible error for the smallest sample corresponds to a level difference of at least 2 mm.
2.4. Measuring systems, stationary or mounted on road tanks, for measuring liquefied gas under pressure (excluding cryogenic liquids)
2.4.1. These measurement systems and their supply tanks shall be permanently connected by fixed piping. A return valve shall be installed between the supply tank and the meter.
2.4.2. The device for maintaining the pressure placed behind the gauge shall ensure that the product remains liquid during the measurement. The required pressure may be maintained either at a fixed value or at a value adjusted under the conditions of measurement.
2.4.2.1. If the pressure is maintained at a fixed value, this value shall be at least equal to the vapour pressure of the product at a temperature of 15 ° C above the maximum operating temperature. The setting of the pressure-retention device shall be possible to seal.
2.4.2.2. If the pressure is set to adjust to the conditions of measurement, it shall be higher than the vapour pressure of the liquid by at least 100 kPa (1 bar) during the measurement. This function must be automatic.
2.4.2.3. In the case of a stationary measurement system for industrial use, the relevant metrological authority may allow the use of a device for maintaining pressure at manual setting, the pressure at the outlet of the measuring device shall not be less than the vapour pressure of the product at a temperature of 15 ° C above the maximum operating temperature of the liquid during measurement. The measuring system shall be accompanied by a diagram showing the vapour pressure of the product as a function of its temperature. If these measuring systems are expected to operate unsupervised, the temperature and pressure shall be continuously recorded by recording equipment.
2.4.3. A gas separator shall be installed in front of the gauge, either in the form of a gas separator or a capacitor.
2.4.3.1. The gas separator shall meet the general requirements either for liquefied gas or for liquids with higher viscosity. However, due to difficult verification, it is permissible for a gas separator to be approved if its effective volume is not less than 1,5% of the volume of liquid delivered per minute at maximum flow rate, where the pipe connecting the gauge to the storage tank is not longer than 25 m. If the pipe is longer than 25 m, the effective volume of the gas separator shall not be less than 3% of the volume of the liquid delivered per minute at the maximum flow rate. In the case of liquefied gas measuring systems, neither the gas indicator nor the transparent device need to be installed.
2.4.3.2. The volume of the capacitor depends on the volume of the pipe between the valve of the supply tank and the valve for maintaining pressure in front of the gauge. It shall not be less than twice the drop in volume of the liquid that may occur when the temperature falls by a value that is conventional to 10 ° C for atmospheric and 2 ° C for underground or heat insulated pipes. For the evaluation of the capacitor volume, the coefficient of temperature volume expansion of 3.10 -3 shall be used per degree Celsius for propane and propylene and 2.10 -3 per degree Celsius for butane and butadiene, instead of using accurate values. For other products with high vapour pressure, the coefficient values shall be determined by the relevant metrological authorities. The capacitor shall be equipped with a hand-operated exhaust device. In the measuring system the capacitor shall be located at the highest point of the pipe. The capacitor volume calculated according to the above method may be divided into several capacitors located at the highest points of the pipe.
2.4.4. In the immediate vicinity of the gauge, the thermometer tank shall be located. The thermometer used shall be at least 0,5 ° C and calibrated. The pressure gauge shall be located between the gauge and the pressure relief valve. For road tank measuring systems, the connection for the pressure gauge is sufficient.
2.4.5 Where the measurement process is carried out in a system located on a road tank, the connection between the gas phases in the supply tank and the intake tank may not be connected.
2.4.6 Safety valves may be incorporated into the measuring system to prevent excessive pressure. If these valves are located behind the gauge, they shall be open to the atmosphere or connected to the intake tank. Under no circumstances shall a safety valve located in front of the gauge be connected by a bypass around the gauge to the valve behind the gauge.
2.4.7 If operating conditions require the use of detachable hoses, the hose shall remain fully filled if its volume is greater than the maximum permissible error for the smallest measurement. The detachable full hose shall have special couplings for full hoses. If necessary, hand-held ventilation devices shall be installed at the end of these hoses.
2.4.8 In the case of the double-cap valve set out in paragraph 1.11, for safety reasons, for each pipe circumventing the gauge, the possibility of closing the valve. In such cases, the pressure gauge located between two closing valves or other corresponding system shall indicate any leakage.
2.5 Milk measuring systems
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Regulation Information
| Citation | Decree of the Ministry of Industry and Trade No. 22 / 2001 Coll., laying down requirements for measuring systems for liquids other than water labelled with EEC mark |
|---|---|
| Regulation Type | Order |
| Author | - |
| Collection | Code of Laws |
| Date of Promulgation | 16.01.2001 |
|---|---|
| Effective from | 21.04.2004 |
| Effective until | - |
| Status | Valid |
The regulation text is for informational purposes only.
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