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T/CECS 10004-2018   Closed expansion vessels with built in diaphragm (English Version)
Standard No.: T/CECS 10004-2018 Status:valid remind me the status change

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Standard No.: T/CECS 10004-2018
English Name: Closed expansion vessels with built in diaphragm
Chinese Name: 内置隔膜密闭式膨胀水箱
Chinese Classification: P45    Heat supply, air supply, air conditioning and refrigerating engineering in general
Professional Classification: T/    Social Organization Standard
Issued by: CECS
Issued on: 2018-01-12
Implemented on: 2018-5-1
Status: valid
Language: English
File Format: PDF
Word Count: 8500 words
Price(USD): 255.0
Delivery: via email in 1 business day
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. This standard is developed in accordance with the rules given in GB/T 1.1-2009. This standard was proposed by and is under the jurisdiction of Committee of City Gas of China Association for Engineering Construction Standardization.   Introduction This standard is formulated according to the requirements of the Notice on Issuing the Pilot Project Plan of the First Batch of Product Standards of China Association for Engineering Construction Standardization in 2017 (JIANBIAOXIEZI [2017] No.015) issued by China Association for Engineering Construction Standardization. Closed expansion vessels with built in diaphragm 1 Scope This standard specifies the classification and model, material and construction, performance requirements, test methods, inspection rules, marking, instructions for use, packaging, transportation and storage of closed expansion vessels with built in diaphragm (hereinafter referred to as "expansion vessels"). This standard is applicable to closed expansion vessels with normal working temperature not greater than 70°C, maximum working temperature not greater than 90°C, maximum working pressure not greater than 3 MPa and effective volume not greater than 12 L, which are used for heating or water supply systems. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies. GB/T 191 Packaging — Pictorial marking for handling of goods GB/T 528 Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties GB/T 531.1 Rubber, vulcanized or thermoplastic — Determination of indentation hardness — Part 1: Durometer method (Shore hardness) GB/T 1690 Rubber, vulcanized or thermoplastic — Determination of the effect of liquids GB/T 2941 Rubber — General procedures for preparing and conditioning test pieces for physical test methods GB/T 2828.1 Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection GB/T 3098.1-2010 Mechanical properties of fasteners — Bolts, screws and studs GB/T 3098.2-2015 Mechanical properties of fasteners — Nuts GB/T 3512 Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests GB/T 5781 Hexagon head bolts — Full thread — Product grade C GB/T 7306.1 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads — Part 1: Parallel internal and taper external threads GB/T 7306.2 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads — Part 2: Taper internal and external threads GB/T 7307 Pipe threads with 55 degree thread angle where pressure-tight joints are not made on the threads GB/T 7759.1 Rubber, vulcanized or thermoplastic — Determination of compression set — Part 1: At ambient or elevated temperatures GB/T 9286-1998 Paints and varnishes — Cross cut test for films GB/T 10125 Corrosion tests in artificial atmospheres — Salt spray tests 3 Terms and definitions For the purpose of this document, the following terms and definitions apply. 3.1 clench joints joint that permanently holds two parts of an expansion vessel together with a separate metal ring 3.2 no rivets riveting process method in which two metal plates and diaphragms are sealed together in a stamping process by using a special connecting mould and utilizing the plasticity of the material itself 3.3 expansion vessel expansion tank tank that absorbs or compensates for changes in water volume due to changes in factors such as temperature by expansion and contraction of a built-in diaphragm separating water and air/nitrogen of pre-flush pressure on both sides, in which the water contained does not contact any other gaseous or liquid medium 3.4 deep drawing machining method enabling the metal parts of the expansion vessel to form from a flat state into a three-dimensional shape without reducing or increasing raw materials by means of pressure and mould 3.5 diaphragm flexible or elastic membrane, which is fixed in the expansion vessel in an air-tight way and divides the expansion vessel into water side and air side. The diaphragm includes (closed) air bag diaphragm and (open) cup diaphragm 3.6 experimental test any form of test used within the framework of a design of experiments method in place of the calculation of an expansion vessel component or the entire expansion vessel Note: Refer to Annex A for the experimental test. 3.7 nozzle short pipe mounted on the shell of an expansion vessel 3.8 maximum working pressure pmax maximum allowable working pressure of an expansion vessel 3.9 effective volume Ve water volume after the water side is injected to reach the maximum working pressure when the gas side reaches pre-charging pressure 4 Classification and model 4.1 Classification 4.1.1 Classification by applicable system See Table 1 for classification by applicable system. Table 1 Classification by applicable systems for expansion vessels Category Applicable appliances and systems Code Heating system Heating appliances and heating water system N Domestic hot water system Hot water supply appliances and hot water supply systems R Tap water system Tap water piping system Z 4.1.2 Classification by expansion vessel shape See Table 2 for classification by expansion vessel shape. Table 2 Classification by expansion vessel shape Category Shape of expansion vessel Code Round Oblate Y Square Flat square F Tank Tank G Others Shapes other than the above three shapes Q 4.2 Model 4.2.1 Model preparation 4.2.2 Example Example: The model of an expansion vessel for the tank heating system with serial number of the manufacturer of ×××× and effective volume of 2.5 L is expressed as XNG2.5-××××. 5 Materials and construction 5.1 Material 5.1.1 Expansion vessel shell The shell material of an expansion vessel should be selected according to Table 3. Materials other than Table 3 may also be used after being proved to meet the requirements of this standard. Table 3 Steel categories used for expansion vessel shell Category Mechanical properties/MPa Chemical composition (mass fraction)/% A Lower yield strength ReLd ≤ 460 C ≤ 0.25; Si ≤ 0.60; Mn ≤ 1.70; P ≤ 0.045; S ≤ 0.045; Cu ≤ 0.40; Ni ≤ 0.50; Cr ≤ 0.30 (0.40 casting) B Yield strength ReH ≤ 275 C ≤ 0.25; Si ≤ 0.60; Mn ≤ 1.70; P ≤ 0.045; S ≤ 0.045; Cu ≤ 0.40; Ni ≤ 0.50; Cr ≤ 0.30 (0.40 casting) C — Austenitic stainless steel with Cr ≤ 19 5.1.2 Diaphragm Diaphragm materials should be selected according to Table 4. Materials other than Table 4 may also be used after being proved to meet the requirements of this standard. Table 4 Commonly-used materials of diaphragm Name of diaphragm material Abbreviation Isobutylene isoprene rubber IIR Acrylonitrile-butadiene rubber NBR Natural rubber NR Styrene butadiene rubber SBR Ethylene propylene diene monomer EPDM Note: Refer to Annex B for tests related to diaphragm in production. 5.1.3 Fastener 5.1.3.1 Bolts and screws that have a performance level of 5.6 or 8.8 specified in GB/T 3098.1-2010 should be used. Nuts to be used shall conform to performance level of 5 or 8 specified in GB/T 3098.2-2015. 5.1.3.2 Hexagon head bolts specified in GB/T 5781 should be used for flange connection. 5.1.3.3 Nozzle threads shall comply with requirements of GB/T 7306.1, GB/T 7306.2 or GB/T 7307. 5.1.4 Welding materials Welding materials shall be suitable for base metal. 5.1.5 Expansion vessels for domestic hot water and tap water systems Metal parts in contact with water shall be stainless steel, corrosion resistant steel or have anti-corrosion measures, and the materials used shall not pollute the water quality. 5.2 Construction 5.2.1 Inner surface 5.2.1.1 The inner surface of the expansion vessel which may come into contact with the diaphragm shall not have sharp edges and corners. 5.2.1.2 The opening in the wall of the expansion vessel shall not damage the diaphragm during riveting. 5.2.1.3 The gap of lap joints shall not be greater than 2 times the thickness of diaphragm at any position. 5.2.2 Outer surface 5.2.2.1 The expansion vessels shall show no burrs and sharp edges on their outer surfaces. 5.2.2.2 The blank holder of the upper and lower shells of the products shall be flat and smooth; the surface shall be free of variegated color and be bright after treatment, without obvious scratches, indentations, pits, bumps and other defects. 5.2.2.3 The spraying surface appearance shall be flat, uniform and free of bubbles, accumulation, sagging and missing coating. 5.2.3 Diaphragm 5.2.3.1 The surface of the diaphragm shall show no crack and bubble. 5.2.3.2 The diaphragm shall be sized to match the expansion vessel and shall not be damaged under inflation pressure. 5.2.4 Inspection opening The expansion vessel with replaceable diaphragms shall be provided with an opening for inspecting and replacing diaphragms. 6 Performance requirements 6.1 Wall thickness of shell The wall thickness at any position of the stamped shell shall not be less than 0.8 mm. 6.2 Pre-charge pressure The absolute deviation between the pre-charge pressure on gas side and the manufacturer's claimed value shall not be greater than 0.02 MPa. 6.3 Shell strength It shall be free of leakage and deformation. 6.4 Volume change rate It shall be free of leakage, and the volume change rate shall not be greater than 4%. 6.5 Tightness The leakage shall not be greater than 10 mL/h, or the expansion vessel shall be free of bubbles. 6.6 Effective volume It shall be greater than 95% of the manufacturer's claimed value. 6.7 Diaphragm performance 6.7.1 Diaphragm thickness The thickness at any position of the diaphragm shall not be less than 1 mm. 6.7.2 Tensile strength at break The tensile strength at break of the diaphragm shall not be less than 10 MPa. 6.7.3 Elongation at break The elongation at break of the diaphragm shall not be less than 450%. 6.7.4 Shore hardness The Shore hardness of cup diaphragm shall be within 50 Shore A ~ 65 Shore A; the Shore hardness of airbag diaphragm shall be within 43 Shore A ~ 65 Shore A. 6.7.5 Compression set in air The compression set of cup diaphragm in air shall not be greater than 40%; the compression set of airbag diaphragm in air shall not be greater than 60%. 6.7.6 Ageing resistance The change of diaphragm performance shall meet those specified in Table 5 after the ageing test is conducted. Table 5 Ageing resistance Physical performance Qualified value Absolute value of change rate of tensile strength at break /% ≤ 25 Absolute value of change rate of elongation at break /% ≤ 25 Shore hardness change value /Shore A ≤ 5 6.7.7 Durability After the test, the pressure on the gas side shall not be less than 50% of the pre-charge pressure, and the pressure drop shall not be greater than 0.015 MPa. 6.7.8 Permeability resistance The percentage of pressure drop shall not be greater than 2%. 6.8 Salt spray resistance After salt spray test, the sprayed surface shall not rust and blister. 6.9 Cross-cut resistance The cross-cut resistance of the sprayed surface shall at least be Grade 2 specified in GB/T 9286-1998. 7 Test methods 7.1 Test conditions and instruments and apparatuses 7.1.1 Test conditions 7.1.1.1 Laboratory conditions The laboratory shall meet the following conditions: b) Laboratory temperature: 20°C±5°C; b) Laboratory inlet-water temperature: 20°C±5°C. 7.1.1.2 Power supply condition The voltage fluctuation of AC supply used in the laboratory shall be within ±2%. 7.1.2 Instruments and apparatus The instruments and apparatuses for test shall meet those specified in Table 6, or those with equivalent precision may also be adopted. Table 6 Instruments and apparatuses Test item Instrument and apparatus example Specification or range Precision/minimum scale Temperature Ambient temperature/°C Thermometer 0°C ~ 50°C 0.5°C Water temperature Thermistor thermometer 0°C ~ 150°C 0.1°C Humidity Ambient relative humidity Hygrothermograph 0% ~ 100% 1% Pressure Water pressure Pressure gauge 0 MPa ~ 0.6 MPa Grade 1.0 Pressure gauge 0 MPa ~ 6 MPa Grade 1.6 Gas pressure Digital pressure gauge 0 MPa~0.6 MPa ±0.4% FS Pressure gauge 0 MPa ~ 6 MPa Grade 1.6 Time Within 1 h Stopwatch — 0.1 s Greater than 1 h Clock — — Mass Electronic scale 0 kg ~ 100 kg 20 g Tightness Gas leakage detector — 0.01 mL/min Materials and construction Vernier caliper 0 mm ~ 150 mm 0.02 mm Groove vernier caliper 0 mm ~ 150 mm 0.02 mm Thread gauge — — Diaphragm thickness Thickness gauge 0 mm ~ 10 mm 0.01 mm Tensile strength at break and elongation at break Tensile testing machine 0 kg ~ 200 kg Grade I Hardness Shore A durometer 0 Shore A ~ 100 Shore A ±1 Shore A Cross-cut test Cutting tool Meet the requirements specified in GB/T 9286 7.2 Measurement of shell wall thickness Measure the deformation position of each part in the stamped vessel parts for three times at the same position, and take the mean value. 7.3 Pre-charge pressure test Connect the pressure gauge to the valve of the expansion vessel, tighten the pressure gauge to press the core into the valve cavity, and read the reading on the pressure gauge. 7.4 Shell strength test Confirm that the shell is not inflated at the gas side and the test pressure is 1.5 times the maximum working pressure claimed by the manufacturer, inject water from the water inlet to raise the pressure slowly, and hold the pressure for 5 min. If the maximum working pressure claimed by the manufacturer is not greater than 0.6 MPa, air pressure may be used instead of water pressure. 7.5 Test for volume change rate Make several holes on the diaphragm of the expansion vessel or fill the water side and the gas side with water by other means, inject water to the maximum working pressure claimed by the manufacturer, measure the mass of injected water, continue to inject water to 2 times the maximum working pressure, hold the pressure for 5 min, then release the pressure, re-inject water to the claimed maximum working pressure, measure the mass of injected water, and calculate the change value of injected water before and after testing. 7.6 Tightness test The tightness test may only be carried out after the shell strength test is accepted. Confirm that the shell is not inflated at the gas side and the test pressure is 1.1 times the maximum working pressure claimed by the manufacturer, and inject water from the valve and water inlet respectively to raise the pressure to the test pressure while venting to the atmosphere at the other side. The test time by bubble method shall not be less than 8 min.
Foreword i Introduction ii 1 Scope 2 Normative references 3 Terms and definitions 4 Classification and model 5 Materials and construction 6 Performance requirements 7 Test methods 8 Inspection rules 9 Marking and instructions 10 Packaging, transportation and storage Annex A (Informative) Experimental test Annex B (Informative) Tests related to diaphragm in production process
Referred in T/CECS 10004-2018:
*GB/T 191-2008 Packaging - Pictorial Marking for Handling of Goods
*GB/T 528-2009 Rubber,vulcanized or thermoplastic - Determination of tensile stress-strain properties
*GB/T 531.1-2008 Rubber vulcanized or thermoplastic - Determination of indentation hardness - Part 1:Duromerer method (Shore hardness)
*GB/T 1690-2010 Rubber,vulcanized or thermoplastic—Determination of the effect of liquids
*GB/T 2941-2006 Rubber - General procedures for preparing and conditioning test pieces for physical test methods
*GB/T 2828.1-2012 Sampling procedures for inspection by attributea-Part1:Sampling schemes indexed by acceptance quality limit(AQL) for lot-by-lot inspection
*GB/T 3098.1-2010 Mechanical properties of fasteners—Bolts,screws and studs
*GB/T 3098.2-2015 Mechanical properties of fasteners—Nuts
*GB/T 3512-2014 Rubber, vulcanized or thermoplastic―Accelerated ageing and heat resistance tests
*GB/T 5781-2016 Hexagon head bolts—Full thread—Product grade C
*GB/T 7306.1-2000 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads--Part 1:Parallel internal and taper external threads
*GB/T 7306.2-2000 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads--Part 2:Taper internal and external threads
*GB/T 7307-2001 Pipe threads with 55 degree thread angle where pressure-tight joints are not made on the threads
*GB/T 7759.1-2015 Rubber,vulcanized or thermoplastic—Determination of compression set—Part 1:At ambient or elevated temperatures
Code of China
Standard
T/CECS 10004-2018  Closed expansion vessels with built in diaphragm (English Version)
Standard No.T/CECS 10004-2018
Statusvalid
LanguageEnglish
File FormatPDF
Word Count8500 words
Price(USD)255.0
Implemented on2018-5-1
Deliveryvia email in 1 business day
Detail of T/CECS 10004-2018
Standard No.
T/CECS 10004-2018
English Name
Closed expansion vessels with built in diaphragm
Chinese Name
内置隔膜密闭式膨胀水箱
Chinese Classification
P45
Professional Classification
T/
ICS Classification
Issued by
CECS
Issued on
2018-01-12
Implemented on
2018-5-1
Status
valid
Superseded by
Superseded on
Abolished on
Superseding
Language
English
File Format
PDF
Word Count
8500 words
Price(USD)
255.0
Keywords
T/CECS 10004-2018, T/CECST 10004-2018, TCECST 10004-2018, T/CECS10004-2018, T/CECS 10004, T/CECS10004, T/CECST10004-2018, T/CECST 10004, T/CECST10004, TCECST10004-2018, TCECST 10004, TCECST10004
Introduction of T/CECS 10004-2018
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. This standard is developed in accordance with the rules given in GB/T 1.1-2009. This standard was proposed by and is under the jurisdiction of Committee of City Gas of China Association for Engineering Construction Standardization.   Introduction This standard is formulated according to the requirements of the Notice on Issuing the Pilot Project Plan of the First Batch of Product Standards of China Association for Engineering Construction Standardization in 2017 (JIANBIAOXIEZI [2017] No.015) issued by China Association for Engineering Construction Standardization. Closed expansion vessels with built in diaphragm 1 Scope This standard specifies the classification and model, material and construction, performance requirements, test methods, inspection rules, marking, instructions for use, packaging, transportation and storage of closed expansion vessels with built in diaphragm (hereinafter referred to as "expansion vessels"). This standard is applicable to closed expansion vessels with normal working temperature not greater than 70°C, maximum working temperature not greater than 90°C, maximum working pressure not greater than 3 MPa and effective volume not greater than 12 L, which are used for heating or water supply systems. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies. GB/T 191 Packaging — Pictorial marking for handling of goods GB/T 528 Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties GB/T 531.1 Rubber, vulcanized or thermoplastic — Determination of indentation hardness — Part 1: Durometer method (Shore hardness) GB/T 1690 Rubber, vulcanized or thermoplastic — Determination of the effect of liquids GB/T 2941 Rubber — General procedures for preparing and conditioning test pieces for physical test methods GB/T 2828.1 Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection GB/T 3098.1-2010 Mechanical properties of fasteners — Bolts, screws and studs GB/T 3098.2-2015 Mechanical properties of fasteners — Nuts GB/T 3512 Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests GB/T 5781 Hexagon head bolts — Full thread — Product grade C GB/T 7306.1 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads — Part 1: Parallel internal and taper external threads GB/T 7306.2 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads — Part 2: Taper internal and external threads GB/T 7307 Pipe threads with 55 degree thread angle where pressure-tight joints are not made on the threads GB/T 7759.1 Rubber, vulcanized or thermoplastic — Determination of compression set — Part 1: At ambient or elevated temperatures GB/T 9286-1998 Paints and varnishes — Cross cut test for films GB/T 10125 Corrosion tests in artificial atmospheres — Salt spray tests 3 Terms and definitions For the purpose of this document, the following terms and definitions apply. 3.1 clench joints joint that permanently holds two parts of an expansion vessel together with a separate metal ring 3.2 no rivets riveting process method in which two metal plates and diaphragms are sealed together in a stamping process by using a special connecting mould and utilizing the plasticity of the material itself 3.3 expansion vessel expansion tank tank that absorbs or compensates for changes in water volume due to changes in factors such as temperature by expansion and contraction of a built-in diaphragm separating water and air/nitrogen of pre-flush pressure on both sides, in which the water contained does not contact any other gaseous or liquid medium 3.4 deep drawing machining method enabling the metal parts of the expansion vessel to form from a flat state into a three-dimensional shape without reducing or increasing raw materials by means of pressure and mould 3.5 diaphragm flexible or elastic membrane, which is fixed in the expansion vessel in an air-tight way and divides the expansion vessel into water side and air side. The diaphragm includes (closed) air bag diaphragm and (open) cup diaphragm 3.6 experimental test any form of test used within the framework of a design of experiments method in place of the calculation of an expansion vessel component or the entire expansion vessel Note: Refer to Annex A for the experimental test. 3.7 nozzle short pipe mounted on the shell of an expansion vessel 3.8 maximum working pressure pmax maximum allowable working pressure of an expansion vessel 3.9 effective volume Ve water volume after the water side is injected to reach the maximum working pressure when the gas side reaches pre-charging pressure 4 Classification and model 4.1 Classification 4.1.1 Classification by applicable system See Table 1 for classification by applicable system. Table 1 Classification by applicable systems for expansion vessels Category Applicable appliances and systems Code Heating system Heating appliances and heating water system N Domestic hot water system Hot water supply appliances and hot water supply systems R Tap water system Tap water piping system Z 4.1.2 Classification by expansion vessel shape See Table 2 for classification by expansion vessel shape. Table 2 Classification by expansion vessel shape Category Shape of expansion vessel Code Round Oblate Y Square Flat square F Tank Tank G Others Shapes other than the above three shapes Q 4.2 Model 4.2.1 Model preparation 4.2.2 Example Example: The model of an expansion vessel for the tank heating system with serial number of the manufacturer of ×××× and effective volume of 2.5 L is expressed as XNG2.5-××××. 5 Materials and construction 5.1 Material 5.1.1 Expansion vessel shell The shell material of an expansion vessel should be selected according to Table 3. Materials other than Table 3 may also be used after being proved to meet the requirements of this standard. Table 3 Steel categories used for expansion vessel shell Category Mechanical properties/MPa Chemical composition (mass fraction)/% A Lower yield strength ReLd ≤ 460 C ≤ 0.25; Si ≤ 0.60; Mn ≤ 1.70; P ≤ 0.045; S ≤ 0.045; Cu ≤ 0.40; Ni ≤ 0.50; Cr ≤ 0.30 (0.40 casting) B Yield strength ReH ≤ 275 C ≤ 0.25; Si ≤ 0.60; Mn ≤ 1.70; P ≤ 0.045; S ≤ 0.045; Cu ≤ 0.40; Ni ≤ 0.50; Cr ≤ 0.30 (0.40 casting) C — Austenitic stainless steel with Cr ≤ 19 5.1.2 Diaphragm Diaphragm materials should be selected according to Table 4. Materials other than Table 4 may also be used after being proved to meet the requirements of this standard. Table 4 Commonly-used materials of diaphragm Name of diaphragm material Abbreviation Isobutylene isoprene rubber IIR Acrylonitrile-butadiene rubber NBR Natural rubber NR Styrene butadiene rubber SBR Ethylene propylene diene monomer EPDM Note: Refer to Annex B for tests related to diaphragm in production. 5.1.3 Fastener 5.1.3.1 Bolts and screws that have a performance level of 5.6 or 8.8 specified in GB/T 3098.1-2010 should be used. Nuts to be used shall conform to performance level of 5 or 8 specified in GB/T 3098.2-2015. 5.1.3.2 Hexagon head bolts specified in GB/T 5781 should be used for flange connection. 5.1.3.3 Nozzle threads shall comply with requirements of GB/T 7306.1, GB/T 7306.2 or GB/T 7307. 5.1.4 Welding materials Welding materials shall be suitable for base metal. 5.1.5 Expansion vessels for domestic hot water and tap water systems Metal parts in contact with water shall be stainless steel, corrosion resistant steel or have anti-corrosion measures, and the materials used shall not pollute the water quality. 5.2 Construction 5.2.1 Inner surface 5.2.1.1 The inner surface of the expansion vessel which may come into contact with the diaphragm shall not have sharp edges and corners. 5.2.1.2 The opening in the wall of the expansion vessel shall not damage the diaphragm during riveting. 5.2.1.3 The gap of lap joints shall not be greater than 2 times the thickness of diaphragm at any position. 5.2.2 Outer surface 5.2.2.1 The expansion vessels shall show no burrs and sharp edges on their outer surfaces. 5.2.2.2 The blank holder of the upper and lower shells of the products shall be flat and smooth; the surface shall be free of variegated color and be bright after treatment, without obvious scratches, indentations, pits, bumps and other defects. 5.2.2.3 The spraying surface appearance shall be flat, uniform and free of bubbles, accumulation, sagging and missing coating. 5.2.3 Diaphragm 5.2.3.1 The surface of the diaphragm shall show no crack and bubble. 5.2.3.2 The diaphragm shall be sized to match the expansion vessel and shall not be damaged under inflation pressure. 5.2.4 Inspection opening The expansion vessel with replaceable diaphragms shall be provided with an opening for inspecting and replacing diaphragms. 6 Performance requirements 6.1 Wall thickness of shell The wall thickness at any position of the stamped shell shall not be less than 0.8 mm. 6.2 Pre-charge pressure The absolute deviation between the pre-charge pressure on gas side and the manufacturer's claimed value shall not be greater than 0.02 MPa. 6.3 Shell strength It shall be free of leakage and deformation. 6.4 Volume change rate It shall be free of leakage, and the volume change rate shall not be greater than 4%. 6.5 Tightness The leakage shall not be greater than 10 mL/h, or the expansion vessel shall be free of bubbles. 6.6 Effective volume It shall be greater than 95% of the manufacturer's claimed value. 6.7 Diaphragm performance 6.7.1 Diaphragm thickness The thickness at any position of the diaphragm shall not be less than 1 mm. 6.7.2 Tensile strength at break The tensile strength at break of the diaphragm shall not be less than 10 MPa. 6.7.3 Elongation at break The elongation at break of the diaphragm shall not be less than 450%. 6.7.4 Shore hardness The Shore hardness of cup diaphragm shall be within 50 Shore A ~ 65 Shore A; the Shore hardness of airbag diaphragm shall be within 43 Shore A ~ 65 Shore A. 6.7.5 Compression set in air The compression set of cup diaphragm in air shall not be greater than 40%; the compression set of airbag diaphragm in air shall not be greater than 60%. 6.7.6 Ageing resistance The change of diaphragm performance shall meet those specified in Table 5 after the ageing test is conducted. Table 5 Ageing resistance Physical performance Qualified value Absolute value of change rate of tensile strength at break /% ≤ 25 Absolute value of change rate of elongation at break /% ≤ 25 Shore hardness change value /Shore A ≤ 5 6.7.7 Durability After the test, the pressure on the gas side shall not be less than 50% of the pre-charge pressure, and the pressure drop shall not be greater than 0.015 MPa. 6.7.8 Permeability resistance The percentage of pressure drop shall not be greater than 2%. 6.8 Salt spray resistance After salt spray test, the sprayed surface shall not rust and blister. 6.9 Cross-cut resistance The cross-cut resistance of the sprayed surface shall at least be Grade 2 specified in GB/T 9286-1998. 7 Test methods 7.1 Test conditions and instruments and apparatuses 7.1.1 Test conditions 7.1.1.1 Laboratory conditions The laboratory shall meet the following conditions: b) Laboratory temperature: 20°C±5°C; b) Laboratory inlet-water temperature: 20°C±5°C. 7.1.1.2 Power supply condition The voltage fluctuation of AC supply used in the laboratory shall be within ±2%. 7.1.2 Instruments and apparatus The instruments and apparatuses for test shall meet those specified in Table 6, or those with equivalent precision may also be adopted. Table 6 Instruments and apparatuses Test item Instrument and apparatus example Specification or range Precision/minimum scale Temperature Ambient temperature/°C Thermometer 0°C ~ 50°C 0.5°C Water temperature Thermistor thermometer 0°C ~ 150°C 0.1°C Humidity Ambient relative humidity Hygrothermograph 0% ~ 100% 1% Pressure Water pressure Pressure gauge 0 MPa ~ 0.6 MPa Grade 1.0 Pressure gauge 0 MPa ~ 6 MPa Grade 1.6 Gas pressure Digital pressure gauge 0 MPa~0.6 MPa ±0.4% FS Pressure gauge 0 MPa ~ 6 MPa Grade 1.6 Time Within 1 h Stopwatch — 0.1 s Greater than 1 h Clock — — Mass Electronic scale 0 kg ~ 100 kg 20 g Tightness Gas leakage detector — 0.01 mL/min Materials and construction Vernier caliper 0 mm ~ 150 mm 0.02 mm Groove vernier caliper 0 mm ~ 150 mm 0.02 mm Thread gauge — — Diaphragm thickness Thickness gauge 0 mm ~ 10 mm 0.01 mm Tensile strength at break and elongation at break Tensile testing machine 0 kg ~ 200 kg Grade I Hardness Shore A durometer 0 Shore A ~ 100 Shore A ±1 Shore A Cross-cut test Cutting tool Meet the requirements specified in GB/T 9286 7.2 Measurement of shell wall thickness Measure the deformation position of each part in the stamped vessel parts for three times at the same position, and take the mean value. 7.3 Pre-charge pressure test Connect the pressure gauge to the valve of the expansion vessel, tighten the pressure gauge to press the core into the valve cavity, and read the reading on the pressure gauge. 7.4 Shell strength test Confirm that the shell is not inflated at the gas side and the test pressure is 1.5 times the maximum working pressure claimed by the manufacturer, inject water from the water inlet to raise the pressure slowly, and hold the pressure for 5 min. If the maximum working pressure claimed by the manufacturer is not greater than 0.6 MPa, air pressure may be used instead of water pressure. 7.5 Test for volume change rate Make several holes on the diaphragm of the expansion vessel or fill the water side and the gas side with water by other means, inject water to the maximum working pressure claimed by the manufacturer, measure the mass of injected water, continue to inject water to 2 times the maximum working pressure, hold the pressure for 5 min, then release the pressure, re-inject water to the claimed maximum working pressure, measure the mass of injected water, and calculate the change value of injected water before and after testing. 7.6 Tightness test The tightness test may only be carried out after the shell strength test is accepted. Confirm that the shell is not inflated at the gas side and the test pressure is 1.1 times the maximum working pressure claimed by the manufacturer, and inject water from the valve and water inlet respectively to raise the pressure to the test pressure while venting to the atmosphere at the other side. The test time by bubble method shall not be less than 8 min.
Contents of T/CECS 10004-2018
Foreword i Introduction ii 1 Scope 2 Normative references 3 Terms and definitions 4 Classification and model 5 Materials and construction 6 Performance requirements 7 Test methods 8 Inspection rules 9 Marking and instructions 10 Packaging, transportation and storage Annex A (Informative) Experimental test Annex B (Informative) Tests related to diaphragm in production process
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T/CECS 10004-2018, T/CECST 10004-2018, TCECST 10004-2018, T/CECS10004-2018, T/CECS 10004, T/CECS10004, T/CECST10004-2018, T/CECST 10004, T/CECST10004, TCECST10004-2018, TCECST 10004, TCECST10004