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QC/T 1164-2022 PDF English

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QC/T 1164-2022: Natural gas filter for road vehicle
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QC/T 1164-2022: Natural gas filter for road vehicle

---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/QCT1164-2022
QC AUTOMOBILE INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 43.060.40 CCS T 13 Natural gas filter for road vehicle ISSUED ON: APRIL 08, 2022 IMPLEMENTED ON: OCTOBER 01, 2022 Issued by: Ministry of Industry and Information Technology of PRC

Table of Contents

Foreword ... 6 1 Scope ... 7 2 Normative references ... 7 3 Terms and definitions ... 8 4 Requirements ... 9 5 Test method ... 12 6 Inspection rules ... 20 7 Marking, packaging, transportation and storage ... 21 References ... 23 Natural gas filter for road vehicle

1 Scope

This document specifies the terms and definitions, classification, technical requirements, test methods, inspection rules and signs, packaging, transportation, storage related to natural gas filters for road vehicles (referred to as filters). This document is applicable to filters that use natural gas as the working medium to achieve particulate impurity filtration and liquid-gas separation, in the gas supply system of automobiles.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, for dated references, only the version corresponding to the date is applicable to this document; for undated references, the latest version (including all amendments) is applicable to this document. GB/T 191 Packaging - Pictorial marking for handling of goods GB/T 1682 Rubber, vulcanized - Determination of low-temperature brittleness - Single test piece method GB/T 1690 Rubber vulcanized or thermoplastic - Determination of the effect of liquids GB 18047 Compressed natural gas as vehicle fuel GB/T 3512 Rubber, vulcanized or thermoplastic - Accelerated ageing and heat resistance tests GB/T 3821 Small and medium power internal combustion engines - Cleanliness limits and measurements GB 6388 Transport package shipping mark GB/T 7762 Rubber, vulcanized or thermoplastic - Resistance to ozone cracking - Static strain testing GB/T 7758 Rubber, vulcanized - Determination of low-temperature characteristics - Temperature-retraction procedure (TR test) normally present in natural gas. [Source: GB/T 8423.3-2018, 2.1.14] 3.3 Initial differential pressure The pressure difference -- between the inlet and outlet of an unused filter, under specified conditions. 3.4 Water dew point The temperature, at which natural gas precipitates the first drop of water, under a certain pressure. 3.5 High-pressure natural gas filter A natural gas filter, which is located between the CNG gas supply system's gas cylinder and the pressure reducer, under a pressure equal to the output pressure of the CNG gas cylinder greater than 3.5 MPa. 3.6 Low-pressure natural gas filter A natural gas filter, which is located at the back end of the pressure reducer of the CNG gas supply system, OR installed in the LNG gas supply system, under a working pressure generally not more than 3.5 MPa. 3.7 Equivalent flow velocity For a filter, whose rated pressure is different from the test pressure of 0.7 MPa, the test flow velocity shall be such that the flow velocity under the test condition is equal to the flow velocity achieved under the rated pressure and flow velocity, THEN, the flow velocity under the test condition is called the equivalent flow velocity. [Source: GB/T 30475.1-2013, 3.6]

4 Requirements

4.1 Working environment requirements 5.6.3 Test procedure 5.6.3.1 Prepare dry test ash with constant weight (drying temperature 120 °C ± 5 °C, time 1 h) and electronic balance. 5.6.3.2 Use the electronic balance, which has the accuracy required by the standard, to weigh the filter elements of the filter under test and the backup filter. Record their masses as m1 and m1', respectively. 5.6.3.3 Install the weighed filter element into the filter under test and the backup filter, respectively. 5.6.3.4 Confirm that valves 2 and 5 are closed. Slowly open valve 1. Adjust the pressure reduction valve 3, to make pressure gauge 7 reach the test pressure. Adjust the flow control valve 12, to make the reading of flow meter 11 reach the test value. Record the initial pressure drop value, after stabilization. 5.6.3.5 Add the weighed ash into the ash-adding container 6. Then fully open the valves 2 and 5, in sequence. Then close the valves 5 and 2 in sequence after a few seconds. Record the reading, after the reading of the differential pressure gauge 9 is stable. 5.6.3.6 Repeat step 5.6.3.5, until the reading of differential pressure gauge 9 reaches or exceeds the net differential pressure. Add up the total amount of ash added at this time. Record it as m. 5.6.3.7 Slowly close the valve 1. After the pressure gauge's reading drops to close to 0, carefully take out the filter elements of the filter under test and the backup filter. Weigh their masses. Record them as m2 and m2', respectively. 5.6.3.8 Use the abscissa as the amount of ash added, the pressure difference as the ordinate, to draw the differential pressure characteristic curve of the tested filter element, as shown in Figure 2. 5.6.3.9 Draw a straight line, using the cut-off pressure difference on the ordinate; the product -- of the corresponding value on the abscissa corresponding to the intersection point of the curve and (m2 - m1)/m -- is the dust holding capacity of the filter element. 5.6.3.10 Repeat the test of the filter element of the same specification. Take the average value of 3 valid test results. Record it as the dirt holding capacity of the filter. 5.6.4 Judgment of test validity 5.6.4.1 The ratio -- of the mass change of the tested filter element TO the total amount of ash added (m2 - m1)/m -- shall be within the range of 90% ~ 105%. 5.6.4.2 The ratio -- of the mass change of the backup filter element to the total ash addition -- (m2' - m1')/m, shall meet the requirement of not more than 1%. pressure source. Install an automatic valve and pressure [translator note: should be pressure gauge], which has a pressure not less than 1.5 times and not more than 2 times the test pressure in the pressure supply pipe. The pressure gauge is installed, between the automatic valve and the test piece. 5.8.3.3 When under the test pressure, the test piece shall be immersed in the silicone oil, to observe whether there are bubbles or detect the leakage: a) Room temperature test: Close the outlet of the filter. Place it at room temperature and maximum working pressure for 8 hours. After 8 hours, start to observe whether there are bubbles or detect leakage, for a duration of 2 minutes; b) High temperature test: Close the outlet of the filter. Place it at the specified maximum working temperature and maximum working pressure for 8 hours. After 8 hours, start to observe whether there are bubbles or detect leakage, for a duration of 2 minutes. During the whole process, the sample cannot leave the specified ambient temperature; c) Low temperature test: Close the outlet of the filter. Place it at the specified minimum working temperature and maximum working pressure for 8 hours. After 8 hours, start to observe whether there are bubbles or detect leakage, for a duration of 2 minutes. During the whole process, the sample cannot leave the specified ambient temperature. 5.9 Overpressure strength test 5.9.1 Test medium Use water or hydraulic oil. 5.9.2 Test procedure 5.9.2.1 The test sample is connected to the pressure source. The pressure relief valve and pressure gauge shall be installed, in the pressure supply pipe, which is not less than 1.5 times and not more than 2 times the working pressure. 5.9.2.2 Open the pressure relief valve to exhaust. Close the pressure relief valve, after the test liquid appears at the gas outlet. 5.9.2.3 Turn on the pressure pump to increase the pressure. The pressure increase rate shall be in accordance with the requirements in Table 9. d) Filtration level; e) Date of manufacture; f) The maximum working pressure; indicate the maintenance and replacement mileage of the filter element, as well as the safety matters to be paid attention to when replacing the filter element; g) The words "IN" and "OUT" or other letters, numbers and Chinese characters, that can distinguish the air inlet and outlet, shall be clearly marked on the filter seat near the inlet and outlet. 7.1.2 There shall be a traceability mark, on each filter element. 7.2 Packaging 7.2.1 When the filter product leaves the factory, a special packing box shall be used. The marks on the packing box and the outside to prevent rain, moisture, pressure, bumps shall comply with the provisions of GB/T 191 and GB/T 6388. On the packing box, at least the following shall be marked: a) Manufacturer's name, trademark, address; b) Product model, name, quantity; c) Production date and mass. 7.2.2 The following documents shall be attached into the packing box: a) Product testing report, material report, performance report, etc.; b) The qualification certificate signed or stamped by the inspector; c) Product instruction manual. 7.3 Transportation During the transportation of the product, it is necessary to prevent bumps, pressure, rain, moisture; the gas inlet and outlet must be protected with dust caps. 7.4 Storage The product shall be stored in a ventilated, dry and non-corrosive gas warehouse; it shall not be squeezed by heavy objects. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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