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ALL-RUSSIAN RESEARCH INSTITUTE
METROLOGICAL SERVICE

(VNIIMS)

FEDERAL AGENCY FOR TECHNICAL REGULATION AND METROLOGY

State system for ensuring the uniformity of measurements

Apartment meters of cold and hot water

Method of periodic (extraordinary) verification during operation

MI 2997-2006

Moscow

2006

1. DEVELOPED BY FSUE "VNIIMS"Ltd firm "Zenner-Vodopribor Ltd" Moscow

PERFORMERS: Danilov M.A., Nikitin V.I., Stepanov O.S., Fudim E.Ya.

4. INTRODUCED FOR THE FIRST TIME

1 AREA OF USE

2. REGULATORY REFERENCES

GOST R 50193.1-3-92 "Measurement of water flow in closed channels. Meters of cold drinking water".

GOST R 50601-93 "Meters drinking water winged. General technical conditions".

GOST 8.156-83. GSI "Cold water meters. Methods and means of verification".

GSSSD. Enthalpy, density, viscosity of water.

3. GENERAL PROVISIONS

3.1. Periodic (extraordinary) verification, then verification, of cold and hot water meters during operation is carried out in order to assess their suitability, and in case of positive results, further operation of the meters is allowed until the deadline periodic verification according to STO SMK 33650664-016-2004 "Cold and hot water meters. Method of verification in operation".

3.2. The frequency of verification is established in the regulatory documents.

3.3. When carrying out verification, it is allowed to use the means registered in State Register measuring instruments and having the relevant valid certificates of verification and verification stamps.

4. VERIFICATION OPERATIONS

4.1. During verification, the following operations are performed:

Visual inspection;

Testing;

Experimental estimates of metrological characteristics;

Formulation of test results.

5. VERIFICATION TOOLS

5.1. During verification, the following measuring instruments and auxiliary equipment are used:

Scales with an upper limit of measurement (URL) of at least 15 kg, division value of not more than 1g. MAP no more than ± 0.1%. Scales must have a device for compensating the tare weight;

Thermometer with URL +60 °С, division value not more than 0.2 °С;

Stopwatch with division value not more than 0.1 s;

Glass cylinder up to 1000 cm 3 2 cells, division value not more than 10 cm 3;

Containers with a capacity of at least 20 liters;

Flexible hose no longer than 1.5 m with a shut-off valve with a diameter conditional pass½” it is allowed to use the shut-off valves of the owner of the meter;

Calculator.

6. REQUIREMENTS FOR SAFETY AND QUALIFICATION OF SPECIALISTS

6.1. During the verification of cold and hot water meters, safety requirements are observed in accordance with the "Safety Rules for Electrical Installations of Consumers", "Rules technical operation electrical installations of consumers" and the safety conditions specified in the regulatory documentation for water meters.

6.2. Pipelines and shut-off valves for cold and hot water must be airtight and free from dripping.

6.3. To perform verification work, specialists with verification certification are allowed.

7. VERIFICATION CONDITIONS

7.1. When checking cold and hot water meters, observe following conditions:

8. PREPARATION FOR VERIFICATION

8.1. Before checking the meters of cold and hot water, the following preparatory work is performed:

With the shut-off valves closed (except for the inlet taps of hot and cold water to the apartment), the absence of water leakage is checked. (Appendix ). The permissible value of the total leakage from all outlet taps (with the tap turned off at the inlet to the toilet flush tank) should not exceed 0.2 l / h. Leak control at each outlet cock is checked using a glass cylinder and a stopwatch.

8.2. If leakage exceeds 0.2 l/h, then further work cease by faith.

8.3. Evaluate the maximum capacity in m 3 /h separately for cold and hot water. Having closed the hot water tap, fully open the cold water outlet tap of the mixer and pour at least 20 liters of water into the bathtub or sink. Performance is checked using a stopwatch (τ) and changing the readings of the water meter. Then the operation is repeated by fully opening the hot water tap and closing the cold water tap.

If there are several inputs of cold and hot water in the apartment, the assessment of the maximum performance is carried out at each input where water meters are installed.

If there is one common input in the apartment, the performance evaluation is carried out on any of the faucets (bath, sink, kitchen) where it is convenient to carry out this operation.

If there is only cold water input and a gas column in the apartment, the assessment of the maximum performance is carried out only for cold water with the gas column turned off.

To carry out this operation, the counters, if necessary, remove the pulse output unit.

Productivity, m 3 / h is calculated by the formula

where V k, V H- final and initial meter readings, l;

t - transit time ( V k - V H ), p.

8.4. The balance is leveled on a rigid base. Turn on the scales and check their performance according to the Operation Manual.

8.5. Install the empty container on the weighing platform. The scales are reset to zero. This operation is carried out before each weighing.

9. VERIFICATION

9.1. Visual inspection.

9.1.1. During an external examination, the presence of a valid passport is established (the data of the device are compared with the passport), verification seals, the presence of seals of the organization responsible for the maintenance of the meter, the absence of unauthorized interference by unauthorized persons, violations of the integrity of the meter design and tightness of connections.

9.2. Testing.

9.1.1. When testing, it is necessary to run the counter on maximum flow pipeline (m 3 / h) for 180 s.

9.2.2. The meter performance is reduced until the indicator rotation stops, after which the water flow is increased until the indicator rotates smoothly (without jerks).

Using a glass cylinder and a stopwatch, the sensitivity threshold is estimated according to the formula () (for example, for SH-15 and SG-15 "Alekseevsky", the sensitivity threshold for metrological class B should not exceed 15 l / h).

9.2.3. If the requirements of clause 9.2.2. the counter is not allowed to furtherverification, and declared unfit.

9.2.4. It is allowed to carry out testing simultaneously with the execution of operations
by section.

9.3. Experimental estimates of metrological characteristics ( MX).

9.3.1. Experimental estimates MX cold and hot water meters are carried out in the following sequence:

9.3.1.1. At the maximum capacity (p.) set for cold and hot water meters, containers with a capacity of at least 15 liters are separately filled, while taking the initial readings ( V H , in liters) from the meter (with an accuracy of 1/2 of the smallest division) until the container is filled, which was weighed on the scales and the final readings of the meter ( V k ). The filling time of the container (in seconds) is fixed with a stopwatch. Water volume(V k - V H ) - not less than 15 liters. Measure the water temperature (°C).

The above operation is carried out at a minimum flow rate. Meaning ( V k - V H ) should be at least 5 liters.

9.3.1.2. Relative meter error, 8 i , %, calculated by the formula

where M- mass of water according to the indications of scales, kg;

ρtis the density of water at temperature t, °C (Appendix).

The measurement and determination of the relative error is carried out at least twice at each flow rate. The discrepancy between the values ​​of the relative error in two measurements should not exceed 0.5%.

9.3.1.3. Each value of the relative error of the meter should not exceed (δ q + 0.17 t ),%,

where δ q- limit of permissible relative error;

t - meter operation time, thousand hours

9.3.1.4. In case of non-fulfillment of the condition according to clause 9.3.1.3, the meter is not allowed for further operation.

10. REGISTRATION OF VERIFICATION RESULTS

10.1. Based on the verification results, a protocol of the established form (Appendix) is drawn up with the signature of the verifier. The owner of the meter and the representative of the Managing Organization must be familiarized with the protocol of verification.

Upon completion of the verification work, the pulse output unit is installed and sealed with a sticky seal, and the meter with a hinged seal with an impression of the verification mark.

Annex A (reference)

Density values ​​(kg / m 3) depending on temperature at a pressure of 1 kgf / cm 3

All-Russian Research Institute of Flow Metering SGNMTs-VNIIRZ GOSSTANDARD RUSSIA

GNSH IN KIMR

Kazan 1999

1.5.4.1.6. The average integral relative error is determined by comparing the results of measurements of the same value of the volume of water by a verified meter and a measure of the capacity of the calibration installation. The value of the volume of water measured by the meter is determined as the sum of the values ​​of the volumes with gaps at five values ​​of the calibration costs according to the pointer indicators of the meter or according to the total number of pulses counted by the optoelectronic signal pickup unit and registered by the pulse counter.

The error of the counter d di as a percentage is determined by the Formula

DDI I- 100%,

where Vc is the volume of water according to the meter, m 3;

Wet - the volume of water in proportion to its capacity.

When using an optoelectronic signal pickup $

Vc = Kc £ N,

where Kc - the transfer coefficient of the counter;

£ N - total number of pulses registered by counter 1 tfr&zek(f$F

impulses after skipping at five-check rates; When used instead of a measure of the capacity of a reference meter

V floor \u003d £ K floor N *

where V floor is the volume of water according to the reference meter, m 3,

The values ​​of the transfer coefficient "Kc" indicate on the scale of the counting mechanism of a particular counter.

The values ​​of the transfer coefficient Cat are determined for each specific reference meter for given values ​​of the calibration costs.

1.5.4.1.7. The average integral relative error is allowed to be determined at the installations in accordance with Appendix G.

Note. The nominal values ​​of the transitional (2) and minimum (3) costs can be changed downwards and set to specifications(indicating these values ​​in the device passport)

1.5.4.1.8. When released from production or after repair, the limit of permissible average integral relative error d di should not exceed 1.8%.

15.4.2. Determination of the relative error for a single measurement

1.5.4.2.1. The relative error of the meter is determined at three values ​​of verification costs (nominal, transitional and minimum). One measurement is made at each flow rate. The values ​​of verification costs for each size of the meter are given in Table. 7.

15.4.2.2. The values ​​of the minimum volumes of water per pass at each value of the calibration flow are given in Table. eight.

15.4.2.3. The relative error of meters is determined by comparing the results of measurements of the same value of the volume of water by a verified meter and a reference meter or a measure of the capacity of the calibration installation. The value of the volume of water measured by the counter is determined for each passage of water by the number of pulses counted by the signal pickup unit and registered by the pulse counter.

The relative error of the meter in percent is calculated by the formula

D(u -. yuo%,

where Vc is the volume of water according to the meter, m 3,

where N is the number of pulses registered by the pulse counter;

Кс - transfer coefficient of the counter indicated on the scale;

Wet - the volume of water according to the reference meter, V et \u003d K et or the volume of the measure of capacity.

15.4.2.4. The limit of permissible relative error of the meter at 1 and 2 (nominal and transitional) values ​​​​of verification costs for cold water should not exceed 2% hot water- 3% (unless other values ​​are indicated in the documentation), at the 3rd (minimum) value of the calibration flow - 5%.

1.6. Registration of verification results

1.6.1. At positive results seals with an impression of the verification mark according to PR 50.2.007 are hung in places that prevent access to the mechanism of the total accounting indicator and the meter control device.

The verification results are entered in the passport (Appendix D) and certified by the signature of the verifier and the impression of the verification mark according to PR 50.2.007.

1.6.2. The measurement results during meter verification are recorded in the protocols, the form of which is given in Appendix F (for the verification procedure from clause 1.5.4.1), Appendix G (for the verification procedure from clause 1.5.4.2), Appendix I (for the verification procedure according to Appendix D ).

1.6.3. Meters that do not meet the requirements of this recommendation are not allowed to be issued and used. The seals with the imprint of the brand are removed, and the entry in the passport is extinguished.

2. VERIFICATION PROCEDURE “Rg” (AFTER REPAIR AND IN OPERATION).

2.1. Verification operations

2.1.1. External examination (clauses 2.5.1 and 2.5.2).

2.1.2. Determination of the mean integral relative error (clauses 2.5.3 and 2.5.4).

2.2. Verification tools

2.2.1. Portable verification unit of the PROLIV-M type (Appendix K).

2.3. Verification conditions

2.3.1. Water temperature: +5 ... +40°С.

2.3.2. Ambient temperature: + 5 ... + 50°С.

2.3.3. Absence of vibration, shaking and shocks that affect the operation of the counter.

2.4. Preparing for verification.

2.4.1. Check the availability of valid certificates of verification of verification tools, impressions of verification marks.

2.4.2. Check the tightness of the connections of the verified meter with the reference meter of the portable verification unit

"STRAIT - M" and pipeline.

The check is carried out by water pressure in the system with the locking device open in front of the meter and closed after it.

2.4.3. Pass water through the meters at the maximum possible flow rate in order to remove air from the system.

2.4.4. The arrow on the body is set in the direction of the water flow.

2.5. Carrying out verification

2.5.1. Visual inspection

During an external examination, the marking of the meter, the possibility of reading the readings, the integrity of the counting mechanism, and the presence of verification marks are visually determined.

2.5.2. If the meter does not comply with the requirements of clause 2.5.1, the meter is considered unsuitable for further operation.

The trust is stopped.

2.5.3. Determination of the average integral relative error

The sequence of actions during verification is given in Appendix L.

The mean integral relative error of the meters is determined using portable verification units of the PROLIV-M type in accordance with Table 9.

Five values ​​of verification costs are successively set using the “PROLIV-M” installation. The values ​​of the verification costs and the values ​​of the weighting coefficients Р!e during verification after repair or in operation at the PROLIV-M units are given in Table 10.

At the end of verification, the actual value and the sign of the error of the meter being verified are determined from the display of the electronic unit of the verification installation.

The values ​​of the minimum total volumes of water during the verification time at five values ​​of verification costs during verification of meters.

having a signal asterisk or a frequency output signal are given in table. 11, and when checking meters that do not have these parameters, in Table. 12.

2.5.4. The limit of permissible average integral relative error of a meter in operation or after repair is determined by the formula

d *di = (|Ddi |+ 0.171),

where A di is the allowable average integral error of the meter when it is released from production and after repair;

t is the operating time, in thousand hours.

The counter is considered trusted if q*^

2.6. Registration of verification results