Decree No. 382 / 2006 Coll.
Order laying down requirements for stationary tanks
Valid
Order
Effective from 01.10.2006
Text versions:
01.10.2006
02.08.2006
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382
DECLARATION
of 11 July 2006
laying down requirements for stationary tanks
The Ministry of Industry and Trade provides pursuant to Sections 6 (2), 9 (1) and 27 of Act No. 505 / 1990 Coll., on Metrology, as amended by Act No. 119 / 2000 Coll. and Act No. 137 / 2002 Coll.:
(1) This Decree sets out requirements for stationary tanks which are used as measuring instruments for the volume of liquids with a relative error of between 0,3% and 2,5% (hereinafter referred to as "tanks'), the procedure for approval and the procedure for verification.
(2) This Decree was notified in accordance with Directive 98 / 34 / EC of the European Parliament and of the Council of 22 June 1998 laying down a procedure for the provision of information in the field of technical standards and regulations and rules and of rules on information society services, as amended by Directive 98 / 48 / EC.
(3) This decree applies to:
(a) refrigerating and storage tanks for milk;
(b) wooden barrels,
(c) concrete and brick storage tanks; and
(d) barrels and tanks of other materials.
(4) This decree does not apply to transport tanks (tanks) for liquids and transport barrels.
The terminology, the requirements for tanks, the type-approval procedure and the verification procedure are set out in the Annex.
This Decree shall take effect on 1 October 2006.
Minister:
Ing. Urban v. r.
Annex to Decree No 382 / 2006 Coll.
1 TERMINOLOGY
1.1 Balast are all components that affect the tank volume. They can be positive - additional volume, such as staves and sludge sinks, or negative - volume loss, such as ladders and mixers.
1.2 The geometric method of testing the tank is a method of testing the volume of the tank based on the measurement of its geometric dimensions and on the calculation.
1.3 The milk cooler is a device for cooling and storage of chilled fresh raw milk.
1.4 The nominal volume is the largest useful volume of the tank given by the structure.
1.5 Calibration is a set of operations to determine the volume of the tank at one or more liquid levels.
1.6 The calibration table is a table expressing the relationship between the height of the tank (independent variable) and its volume (dependent variable).
1.7 The coefficient of expansion k = 2 for the normal (Gaussian) distribution means that the confidence interval corresponds to the confidence coefficient value of 0,95 (i.e. the actual value is likely to be 0,95 at the boundaries of the expanded uncertainty value).
1.8 The dead space of the tank is the space at the bottom of the tank in which it is not measured.
1.9 The milk is the quantity of milk which is added to the tank at one milking time.
1.10 The four-milking tank is a tank designed to be emptied at the milk collection every other day and for cooling and storage of its nominal volume for 48 hours.
1.11. The floating roof tank is a measuring vessel in the shape of a vertical cylinder, the roof of which moves in a vertical direction and swims on the surface of the liquid.
1.12 Uncertainty is the estimate assigned to the result of the measurement and characterising the interval of values that are claimed to be within it of the correct value.
1.13. The smallest difference in the volume of the tank is the volume of the liquid in the tank corresponding to the smallest difference in level heights without exceeding the greatest permissible error.
1.14 The smallest difference in level heights is the smallest difference in level heights, which can be measured on the given tank without exceeding the greatest permissible error.
1.15. The lowest level height is the level height corresponding to the bottom between the measuring range (level height above the dead tank compartment).
1.16. The mass test method is a test method by fluid discharge or discharge.
1.17 The underground tank is a tank which, in addition to the upper handling holes, is covered by a layer of soil of at least 500 mm thick or by a solid construction of PD1 with a fire resistance of at least 120 minutes.
1.18. The reference points are the plate at the bottom or bottom of the tank as zero level and the control reference point at the top of the tank. For automatic level meters, multiple reference points may be used after tank height.
1.19. Level height is the distance between the liquid level in the tank and the lower base.
2 REQUIREMENTS FOR INSTRUMENTS
2.1. METHOLOGICAL REQUIREMENTS
2.1.1. The tanks shall be divided:
(a) by volume for tanks up to 100 m3 and above 100 m3;
(b) according to the shape on cylindrical tanks, horizontal or vertical, with flat, conical, spherical, elliptical or dome bottom (end), ball, parallel wall and other tanks;
(c) by location on the ground and above ground;
Figure 1 Underground tanks
Dimensions are given in mm.
Figure 2 Above ground tanks
Dimensions are given in mm.
(d) by activity on an open, closed, low pressure, high pressure, with a floating roof and a floating cover;
(e) according to tank temperature without heating, with heating without insulation, with heating with thermal insulation, cooling and thermal insulation,
(f) according to the volume measurement on tanks with one mark, with a measuring device with a scale, a manual reading of a specific bar or band and an automatic level measurement.
2.1.2 The greatest permissible errors and uncertainties
The greatest holiday uncertainty calibration for tanks is:
(a) ± 0,2% for vertical cylindrical tanks measured by the geometric method;
(b) ± 0,3% for recirculated or tilted cylindrical tanks measured by the geometric method and for all tanks measured by the volumetric method;
(c) ± 0,5% for spherical or spherical tanks measured by the geometric method.
The calibration table may be extended below the lower volume accuracy limit, but the above limits do not apply to this extended area.
The highest permitted relative error of determining the volume of the liquid according to the accuracy class is:
(a) ± 0,3% for the accuracy class 0,3;
(b) ± 0,5% for the accuracy class 0,5,
(c) ± 1,0% for accuracy class 1,0,
(d) ± 2,5% for the accuracy class 2,5.
The expanded uncertainty when determining the volume, with an extension coefficient k = 2, shall not exceed:
(a) 0,05% for the accuracy class 0,3;
(b) 0,08% for class 0,5,
(c) 0,1% for the accuracy class 1,0;
(d) 0,5% for tier 2,5.
2.1.3. Minimum tank volume difference
The minimum difference in volume of the tank shall be determined by multiplying the maximum surface area of the tank by the height specified in Table 1.
Table 1
| Třída přesnosti | Nejmenší rozdíl výšek hladin (v mm) | ||
|---|---|---|---|
| Nádrže s pevnými stěnami | Nádrže s plovoucí střechou | ||
| Vodorovné válcové a kulové | Svislé válcové | ||
| 0,3 | - | 1500 | - |
| 0,5 | - | 1000 | 2000 |
| 1,0 | 400 | 300 | 1500 |
| 2,5 | 150 | 100 | 500 |
The minimum measurable volume of the tank is determined as a change in Δh of the liquid level, resulting from cumulative uncertainty of the measurement of the level at two consecutive points, not leading to a relative error of the volume of the tank emitted or accepted greater than the specified value ε (h), generally less than the greatest allowed calibration uncertainty.
2.1.4. The following measurement units shall be used for tanks:
volume - m3, dm3, litre (l),
length - m, mm.
2.2 TECHNICAL REQUIREMENTS
2.2.1. Construction
2.2.1.1 General requirements for construction
The structure of the tank shall be so constructed that:
(a) guarantee a long life and protection against unauthorised interference;
(b) the separation of the measured liquid is secured in the supply and outlet pipes;
(c) no air bags are formed in the tank during its discharge and liquid bags during its discharge;
(d) the operation of measuring equipment and apparatus belonging to it is ensured.
The tank must be stable on its foundations. This shall be achieved either by anchorage or by keeping the tank filled for the time necessary to stabilise its position.
2.2.1.2. Specific requirements for construction
The milk coolant tank, which is not designed to be mounted on a fixed base by design, shall be equipped with adjustable supports or legs which allow its position to the base position when installed on the floor with a gradient of not more than 1: 50 in any direction, and the height difference between adjacent supports is not greater than 50 mm. If the tank is equipped with a device for measuring the volume of milk based on linear measurements, the supports or legs shall be so designed that, when the tank is levelled in a horizontal position, its adjustment in that position is firmly ensured.
Figure 3 Milk cooling tank
All internal connections of the walls of the internal milk cooler which form an angle of less than 2,36 radians (135 °) shall have a radius of not less than 25 mm; all other shall have a radius of not less than 3 mm.
The milk coolant tank shall have at least one inlet tube or at least one inlet with a diameter of 180 mm or both. If the contact tube is part of the tank, it shall be so designed as to prevent foaming as far as possible.
The milk cooler shall have a discharge outlet for flushing water. The throat of the discharge hole and the bottom of the inner container shall be so designed that all flushing water flows into the discharge hole. If the discharge hole is to be used also for milk effluent, it shall meet the following requirements:
(a) the highest point within the outer end of the discharge pipe, including the discharge valve, shall be lower than the lowest part of the bottom of the inner container;
(b) the discharge pipe shall be made of stainless steel and shall have an internal diameter (50 ± 3) mm, shall have no more than one knee and one coupling, may be fitted with a closing valve and shall end with an external thread shape, provided with a lid.
(c) the clearance below the discharge tube shall be at least 100 mm;
(d) if the device with the stopper is used, the stopper shall be sealed even without fixing the bar; the rod stopper must remain out of reach of the mixer and must not interfere with the milk drain,
(e) from a milk coolant tank filled with 40 litres of milk shall, in its basic position, drain at least 39,8 l per minute,
(f) if the milk coolant tank is intended for the rapid outflow of the milk, it shall, in its basic position, have a discharge from all parts to the discharge opening at a gradient of at least 1: 20 for rectangular tanks or 1: 15 for diameter of the vertical cylinder, the container shall have a circular or elliptical discharge hole with a shaft of not less than 25 mm deep with a diameter of not less than 100 mm and not more than 200 mm.
For vertical cylindrical tanks exceeding 2000 m3, five control marks shall be used, one placed as close as possible to the centre and the other close to the walls. The control mark least affected by the sun shall be considered as the basic control mark.
Figure 4 Vertical cylindrical tank
The receptacles shall have the shape of the reclining cylinders with liberals or reading edges to check the inclination.
Figure 5 reclining cylindrical tank
The production material of barrels and their execution shall guarantee resistance to deformation; the internal reinforcement of the barrel, for example by partitions and supports, is not permitted; If the thickness and design of the barrel shell do not guarantee sufficient resistance to deformation, the casing shall be reinforced outside the ring. The filling hole of the barrel shall be placed and adjusted so that it can be fully filled. Casks of solid wood with pulp connected to the meeting (on the tupo), held together by metal hoops, shall be made in curved shape so that the largest circumference is located in the centre of the barrel body and shall have two faces which are either flat or slightly curved.
2.2.1.3. Materials
The tanks shall be made of materials which are reasonably firm and durable for use, resistant to permanent deformation, deflection or displacement which could change the volume of the container. All materials used for the manufacture of the container casing shall be resistant to the internal physical and chemical exposure of liquids and weather effects. Changes in liquid temperature within the operating temperature range shall not adversely affect the materials from which the tank is manufactured.
The internal container of the milk cooling tank and any accessories which may come into contact with milk must be made of austenitic stainless steel or materials which satisfy the hygiene requirements laid down by the specific legislation1). The materials from which sealing is made must be non-toxic, fat-resistant, anti-cleansing and disinfection products at effective temperatures and concentrations and must not adversely affect the quality of the milk.
The thermal insulation of the milk refrigerating tanks shall be such that the natural warming of the milk from the final values (4 ± 1) ° C or (5 ± 1) ° C is not greater than 3 ° C in 12 hours at ambient temperature 32 ° C and with the refrigerating device and mixer off.
The materials used for the manufacture of barrels, intended for liquids under pressure (beverages containing gas) and the processing of such materials shall be such that:
(a) the total barrel volume at 20 ° C and at atmospheric pressure has not increased by more than 0,25% for Class A barrels and by more than 0,50% for Class B barrels at 105 Pa internal pressure for 48 hours;
b) after the barrel has been subjected to pressure 105 Pa for 72 hours and subsequently atmospheric pressure for 72 hours, the difference in volumes of initial and final as a result of application of the test pressure shall not exceed 1 / 10 of the values specified in paragraph (a).
2.2.1.4 Tight - pressure resistance
The tanks shall withstand the constant application of the pressure of the liquid to which they have been designed (maximum operating pressure), without failure of function, without leakage, without leakage through walls or permanent deformation of the tank, measuring marks and built-in devices.
The tanks shall be so constructed as to prevent evaporation losses.
2.2.1.5. Equipment for measuring tank level and volume
The tanks shall be equipped with:
(a) a guide pipe and measuring rod,
(b) an opening and a measuring band;
(c) a scale sign;
(d) through a vent in the wall of the container with a scale; or
(e) an automatic level meter.
In the case of reclining cylinder tanks, the measuring points are located in the centre of the cylinder or on one of the control holes. The measuring rods and scales on the installation and observation windows shall have a marked division in units of length or volume. The size of the piece is from 2 mm to 10 mm.
A level height measuring device is such that the level height or volume is measured in one of the following ways:
(a) directly by the vertical distance from the reading plane situated below the liquid surface (lower base);
(b) indirectly according to the vertical distance of the reading plane situated above the surface of the liquid (upper base),
(c) depending on the difference in liquid levels.
The measuring rod shall be so constructed as to stand on the reading surface (standing) when measuring the level height or to hang on the aiming support (hanging). The measuring rod shall be in a vertical position. The measuring rod shall be resistant to deformation and wear.
The scale is marked on the wider side of the measuring bar, either in units of length (D) or in units of volume (O). The scale shall meet the following requirements:
(a) the smallest part of the scale is 1 mm, or (2; 5; 10; 20) l according to the nominal volume and accuracy class of the container;
b) each tenth piece of scale is distinguished by the length of the comma,
(c) the width of the comma is not more than 0,5 mm,
(d) the height of the digits of the numerical marking and the unit designation shall be not less than 3 mm;
(e) the numerical marking shall be made for each (10, 50 or 100) unit according to the value of the smallest piece and the length of the scale;
(f) the unit designation is placed next to or above the last scale line.
The reference points shall be so designed that their positions remain constant due to filling, temperature change and the like.
Figure 6 Automatic level meter
2.2.1.6 Automatic level measurement
The tanks may be equipped with devices to automatically measure the level height. The permissible error of this device shall not exceed ± 0,03 per cent of the height of the measured level.
2.2.1.7 Measurement bands
Scale division error:
(a) ± (0,1 + 0,05 L) mm for the accuracy class 0,3;
(b) ± (0,1 + 0,1 L) mm for the accuracy class 0,5,
(c) ± (0,3 + 0,2 L) mm for accuracy class 1,0,
(d) ± (0,3 + 0,2 L) mm for the accuracy class 2,5,
where L is the nominal length of the steel band expressed in metres.
The error shall be less than ± 0,6 mm.
2.2.1.8 Temperature measuring devices
The tanks shall be equipped with temperature measuring devices when the measured liquid is heated or cooled, or a deviation from the specified reference temperature may cause an unacceptable error in the measurement of volume.
The milk temperature measuring device shall be provided with an easy to read scale, marked from 0 ° C to 40 ° C, divided from 0 ° C to 12 ° C after one degree Celsius and the length of the scale between (2 to 14) ° C shall be at least 20 mm. In the case of devices with a circular scale, the length of the scale shall be determined on a circle inscribed by the tip of the hand or on a circle forming the outer end of the lines indicating the distribution after degrees Celsius and which is smaller. The milk temperature shall be measured after mixing for three minutes. The automatic system for the control of milk storage modes shall ensure compliance with the prescribed temperatures to within ± 1 ° C at a charge of at least 20 per cent of the nominal volume. The minimum number of temperature measurement points depending on the tank dimensions is given in Table 2.
Table 2
| Největší vnější rozměr | Nejmenší počet měřicích bodů teploty na jednu stěnu nádrže | ||
|---|---|---|---|
| Kratší stěna nádrže | Delší stěna nádrže | Stěna válcové nádrže | |
| ≤ 2 m | 1 | 4 | |
| 2 m až 3 m | 1 | 2 | x |
| ≥ 3 m | 1 | 3 | x |
2.2.2. Labels and marks
2.2.2.1. Letters
A production label shall be placed on the tank shell or near the targeting hole containing the following information:
(a) a business firm or name, registered office and identification number, if the manufacturer is a legal person, or the name (s), surname or, where applicable, business name, permanent residence (if the manufacturer is not resident in the Czech Republic, domicile), or place of business and identification number, if the manufacturer is a natural person;
(b) the year of manufacture and the production (identification) number;
(c) the nominal volume in m3, dm3 or litres, rounded down to the whole unit;
(d) measurement range (height between reference points), minimum volume;
(e) the accuracy class;
(f) maximum operating pressure in Pa;
(g) the basic temperature and temperature range of the liquid in ° C to which the calibration table applies;
(h) the name of the product or the nature of the liquid;
The production label shall be metal-resistant to damage under normal operating conditions. The information labels, labels and inscriptions shall be so placed as not to prejudice the control of official and prescribed markings.
The label on the measuring rods shall bear the following particulars:
(a) the serial number of the tank;
(b) the distance between the minimum margin mark and the seating surface of the measuring bar or the upper surface of the float in mm;
(c) the distance between the nominal volume mark and the seating surface of the measuring bar or the upper surface of the float in mm.
The tank's production number shall be indicated on the scale of the worksign.
2.2.3. Procedure for determining the volume (quantity) of liquid in the tank
(a) measuring the free liquid level from which the volume of Vtr at tr is determined using the values given in the calibration table;
(b) measuring mean temperature tr,
(c) sampling and preparation of a medium representative sample of the contents of the tank, laboratory determination of the density of the fluid ρtl at tl, very close tr,
(d) determination of the density of ρtr based on ρt by calculation using tables;
M = V0.ρt0
(e) calculation of the mass of the liquid according to the formula:
M = Vtr.ρtr
The procedures described in (d) and (e) may be replaced by the determination of volume V0 and density ρt0 at reference temperature t0 according to the formula:
2.2.4. Conditions of operation of tanks
(a) the height of the water layer at the bottom of the tank, the amount of water in the mixture and the quantity of solid additives in the suspension shall be measured at specified intervals;
(b) if a device is used to determine the mass of the liquid directly depending on the hydrostatic pressure, the meter reading (with a scale in mass units) shall be subtracted;
(c) in the case of a liquid under pressure without a gaseous phase, the pressure shall be measured and correction for the compressibility of the liquid and the flexible deformation of the tank shall be taken into account;
(d) in the case of the present occurrence of the gaseous and liquid phases, in addition to the corrections referred to in (c), the equivalent of the liquid for saturated vapours shall be determined and added to the volume of the liquid.
3 TYPE APPROVAL
3.1. Type-approval procedure
3.1.1. The application for approval shall be submitted before the tank is built. The particulars of the application for type-approval shall be laid down in a separate legislative act (2).
3.1.2. Assessment of documentation
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Regulation Information
| Citation | Decree No. 382 / 2006 Coll., laying down requirements for stationary tanks |
|---|---|
| Regulation Type | Order |
| Author | - |
| Collection | Code of Laws |
| Date of Promulgation | 02.08.2006 |
|---|---|
| Effective from | 01.10.2006 |
| Effective until | - |
| Status | Valid |
The regulation text is for informational purposes only.
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