GB 8337-2011 English PDF

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GB 8337-2011: [GB/T 8337-2011] Fusible plug device for gas cylinders
Status: Valid

GB 8337: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB 8337-2011	289	Add to Cart	3 days	[GB/T 8337-2011] Fusible plug device for gas cylinders	Valid
GB 8337-1996	279	Add to Cart	3 days	Fusible plug for gas cylinders	Obsolete
GB 8337-1987	RFQ	ASK	3 days	Fusible plug for gas cylinders	Obsolete

Similar standards

GB/T 8334   GB/T 9251   GB/T 9019   GB/T 8336   

Basic data

Standard ID: GB 8337-2011 (GB8337-2011)
Description (Translated English): [GB/T 8337-2011] Fusible plug device for gas cylinders
Sector / Industry: National Standard
Classification of Chinese Standard: J74
Classification of International Standard: 23.020.30
Word Count Estimation: 11,148
Date of Issue: 2011-07-20
Date of Implementation: 2012-06-01
Older Standard (superseded by this standard): GB 8337-1996
Quoted Standard: GB/T 469; GB/T 728; GB 8335-2011; GB/T 7306.2-2000; GB/T 13005; YS/T 72; YS/T 536.1; YS/T 536.10; YS/T 536.11; YS/T 536.12; YS/T 536.13; YS/T 536.2; YS/T 536.3; YS/T 536.4; YS/T 536.5; YS/T 536.6; YS/T 536.7; YS/T 536.8; YS/T 536.9
Adopted Standard: CGA S-1.1-2005, NEQ
Regulation (derived from): Announcement of Newly Approved National Standards No. 10 of 2011
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This Chinese standard specifies the fusible plug device (hereinafter referred to as"fusible plug device") of manufacture, inspection, testing and acceptance of the basic requirements. This standard applies to the installation on the cylinder fusible plug device, the cylinder valve with fusible alloy may refer to the provisions of this standard.

GB 8337-2011: [GB/T 8337-2011] Fusible plug device for gas cylinders

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Fusible plug device for gas cylinders ICS 23.020.30 J74 National Standards of People's Republic of China Replacing GB 8337-1996 Cylinders with fusible alloy plug device Published 2011-07-20 2012-06-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China issued

Foreword

All technical contents of this standard is mandatory. The standard according to GB/T 1.1-2009. drafting rules "Standardization Guide Part 1 standard structure and preparation of" analysis. Instead of the standard GB 8337-1996 "with a fusible alloy cylinder plug." This standard GB 8337-1996 comparison, the main technical changes are as follows. --- The "fusible alloy plug" to "fusible alloy plug device." --- the fusible plug means well known to increase an operating temperature. 102.5 ℃ for the nominal working pressure is greater than 3.45MPa not more To 30MPa cylinders. And the nominal operating temperature of 70 ℃ fusible plug restrict the use of the apparatus a predetermined pressure. --- increased anti nominal working pressure for not more than 3.45MPa greater than 30MPa cylinder fusible plug means and the extrusion test Fatigue test requirements. --- fusible plug increases the pressure tightness test apparatus, the test pressure cylinders original nominal working pressure increased to 1.25 times the Cylinders nominal working pressure. --- Appendix A for increasing the nominal working pressure of not more than 3.45MPa greater than 30MPa cylinder fusible plug fusible device Requirements alloy formulations. Standard reference using the revised American edition 2005 Compressed Gas Association CGAS-1.1 "pressure relief means the first part. Pressure Compressed gas cylinder "of the content, the content is consistent in the art, it is not equivalent. This standard is proposed and managed by the National cylinder Standardization Technical Committee (SAC/TC31). This standard was drafted. Elephant valve Ltd., Shanghai Star to Environmental Equipment Co., Ltd., Ningbo Fu valves, gas Shanghai Body Valve Plant, Beijing Tianhai Industry Co., Ltd., Shanghai Dahua New brazing materials factory. The main drafters. Wu Hong, Weng Guodong, autumn long-kwan, red hair rainbow, money originated, Gu Qiuhua, Shi Gu Wei, Zhang Jinchun. This standard supersedes the previous editions are. --- GB 8337-1987, GB 8337-1996. Cylinders with fusible alloy plug device

1 Scope

This standard specifies the basic requirements fusible alloy plug apparatus (hereinafter referred to as "fusible plug device") manufacture, inspection, testing and acceptance. This standard applies to the cylinder mounted on the fusible plug means, the fusible alloy cylinder valve with a predetermined reference may be present standards.

2 Normative references

The following documents for the application of this document is essential. For dated references, only applies to the version dated paper Pieces. For undated references, the latest edition (including any amendments) applies to this document. GB/T 469 Lead ingots GB/T 728 tin ingot GB 8335-2011 special threaded cylinder GB/T 7306.2-2000 55 ° pipe thread seal Part 2. Taper internal and the external threads GB/T 13005 The term & cylinders YS/T 72 Cadmium Ingot YS/T 536 (all) chemical analysis of bismuth

3 Terms and Definitions

GB/T 13005 defines the following terms and definitions apply to this document. 3.1 Fusible plug means fusibleplugdevice It is carried out by flowing the fusible alloy plug hole or melting operation can not be repeated opening and closing, a removable pressure relief means. In normal The case where the plug hole in a closed state, at a given temperature in the plug hole to flow or melt the fusible alloy, so that the medium release bottle relief cylinders. 3.1.1. Plug plugbody It provided with removable plug hole member used for filling a plug hole fusible alloy. 3.1.2. Fusible alloy fusiblealoy Low melting point metal material is formulated as a low-melting alloy by a certain percentage. 3.2 Fusible alloy flow temperature yieldtemperatureoffusiblealoy When tested in accordance with the provisions of 8.2, the eutectic temperature of a gold sample glycerin bath fuse. 3.3 Fusible plug means operating temperature yieldtemperatureoffusibleplugdevice When tested in accordance with the provisions of 8.3, fusible plug means the temperature of the fusible alloy extrusion glycerin bath when gas leakage. 3.4 Batch batch Fusible plug means the same specifications, the same formulation fusible alloy, in the same manufacturing process and the same heat fusible alloy being defined by continuous infusion quantity.

4 structure type and basic parameters

The basic structure type 4.1 fusible plug means Fusible plug means consists of two parts of the plug body and ease fluxing composition, the basic structure of the type shown in Figure 1. Description. 1 --- plug; 2 --- fusible alloy. 1 a schematic view of the basic structure type fusible plug device of FIG. 4.2 fusible alloy flow temperature Fusible alloy flow temperature should meet the requirements of the operation temperature of the fusible plug means, the flow temperature range and deviation should satisfy 4.3 Fusible plug means a predetermined operation temperature. 4.3 fusible plug means operating temperature Operating temperature fusible plug device is divided into three. 70 ℃ 4-2 ℃ (nominal operating temperature was 70 ℃, except for the well-dissolved acetylene cylinders He said working pressure is less than or equal to the cylinder 3.45MPa); 100 ℃ ± 5 ℃ (nominal operating temperature of 100 ℃, for acetylene cylinders); 102.5 ℃ ± 5 ℃ (nominal operating temperature was 102.5 ℃, for the nominal working pressure of 30MPa and not more than 3.45MPa greater than Cylinders).

5 plug

5.1 plug material 5.1.1 plug material should have sufficient mechanical properties and corrosion resistance, and should be compatible with the media bottle. 5.1.2 plug material copper alloy, steel or other suitable metal should be used. Plug for dissolved acetylene cylinders, non-selected amount of copper 70% of the copper alloy, and silver, zinc, cadmium and its alloys. 5.1.3 chemical composition and mechanical properties of the plug material should conform to appropriate technical standards, to meet the requirements of manufacture and use, and should be effective The quality certificate, or should retest. 5.2 plug basic types 5.2.1 plug type can be substantially Referring to FIG 2, other types may also be employed. However, any type of plug, which shall be constructed to have sufficient Strength and stiffness, can not be deformed in use. 5.2.2 In vitro threaded plug should PZ27.8 PZ19.2 or conical external threads, or GB specified in GB 8335-2011/T 7306.2- 2000 specified in R21/R21 or 4 /. 8 conical external threads. a) Cone b) stepped hole c) a threaded bore

2 a schematic view of the basic version of the plug body

Easy 6-fluxing 6.1 Configuration fusible alloy materials shall comply with relevant technical standards, and should have a valid certificate of quality, or should retest. 6.2 fusible alloy should be bismuth, lead, tin, cadmium gravimetrically composition suitable eutectic alloy containing bismuth content of not less than 48%, the formula See Appendix A. 6.3 fusible gold purity of raw materials. Bismuth. 1 satisfies a predetermined table, the chemical analysis methods and bismuth impurities accordance YS/T 536; Lead. not less than the minimum requirement GB/T 469 as specified; Tin. not less than 728 minimum requirements specified in GB/T ; Cd. not less than the minimum specified in claim 72 YS/T. Table 1 Trademark chemical composition/% not less than Impurity content of not greater than Ag Cu Pb Zn Fe arsenic, antimony chloride, tin telluride, Cd, Hg Ni Bi99.95 99.95 0.003 0.010 0.005 0.001 0.020 0.001 0.001 0.002 0.005 - - - - Note. The content of bismuth is 100% minus the sum of the impurities measured. 6.4 fusible preparation of gold 6.4.1 fusible alloy formulation is determined, the weighing scale formulations, press bismuth, lead, tin, cadmium order sequentially melted liquid. 6.4.2 bismuth and lead in the mixing process, the temperature should not exceed 371 deg.] C; when adding tin and cadmium, the temperature should not exceed 260 ℃. 6.4.3 Each fusible alloy casting furnace should be carried out continuously in the same class. Casting the casting temperature should be higher than the flow temperature of the fusible alloy, and Before each casting, first floating on the liquid surface of the slag, dirt, metal oxides and other impurities removed. 6.4.4 After melting the raw material, should be cast into rods or ingots fusible alloy, good casting each of the fusible alloy ingot or rod should have a permanent, significant Heat number marked.

7 perfusion fusible alloy

7.1 fusible alloy before perfusion, the plug body should be thoroughly cleaned to remove oil plug hole and rust and other impurities. After washing 7.2 jack advised plug hole for hanging in the surface layer, layer material should be used to hang tin or tin-lead alloy. 7.3 Use one of the following methods to plug hole perfusion fusible alloy. a) The plug body is heated to a temperature which is slightly higher than the flow temperature of the fusible alloy, then a good melting fusible alloy infusion into Jack; b) the plug is heated to a certain temperature, and then the fusible alloy rod is inserted into the plug hole, so that the fusible alloy is melted in the plug hole; c) a predetermined length or size of the fusible alloy rod is inserted into the plug hole, then they are heated to melting fusible alloy. Using this method When, to strictly control the temperature, to avoid overheating. To 7.4 before reperfusion fusible alloy plug hole, should be removed good melting fusible alloy surface or oxide surface of the fusible metal rod. In Fusible Gold in the perfusion process, heating should be uniform, and to avoid overheating. 7.5 After perfusion is completed, the fusible alloy should fill the plug hole, and should remove the excess parts.

8 inspection and test methods and acceptance criteria

8.1 the threaded plug vitro test Gauge plugs one by one in vitro test for threaded plug threaded vitro should meet the requirements of the standard, the plug body is not unqualified Fusible alloy was used for perfusion. 8.2 fusible alloy flow temperature test 8.2.1 From each furnace fusible alloy optionally two test specimens, specimens having a diameter of 6mm, a length of 50mm. 8.2.2 The sample was horizontally supported at a distance of 25mm on the edge, the projecting ends 12.5mm outer edge, and then immersed in glycerol Slot, which is controlled by the temperature of the outer groove glycerol, the test apparatus shown in Figure 3. In millimeters Description. 1 --- fusible alloy specimen; 2 --- glycerol inner groove; 3 --- glycerol outer groove; 4 --- heater. FIG 3 is easy to test a schematic flow temperature fusing gold 8.2.3 two samples should be tested simultaneously, the temperature of the glycerin bath insert with a thermometer or thermometer, is placed between two samples, the temperature Meter bulb thermometer or maintain the same level of the sample, glycerin bath temperature rise rate is not more than 2 ℃/min, until the temperature of the glycerin bath was raised to Fusible alloy is the lowest temperature flow 6 ℃. After the temperature of the glycerin bath is to be stable at this temperature, the temperature of the glycerin bath is not more than 0.6 ℃/min rate of temperature raising was continued until the fusible Alloy blown. Glycerol may be agitated during the test such that the temperature uniformity. 8.2.4 Acceptance rules Two samples of four fulcrum fusing temperature at the second end portion of the fuse, i.e. flow temperature fusible metal, the fusible alloy flow Temperature variation range and shall meet the requirements of 4.3. 8.3 Test apparatus fusible plug General provisions 8.3.1 Batch and testing 8.3.1.1 fusible plug means to be not more than 3,000 as a number. 8.3.1.2 optionally two samples from each batch of fusible plug device, 8.3.2 and 8.3.3 predetermined successively tested, the test thermometer Thermometer or fusible plug means as close as possible, the test device shown in Figure 4. Description. 1 --- fusible plug samples; 2 --- thermometer; 3 --- communication hole temperature; 4 --- heater; 5 --- Glycerol groove; 6 --- pressure channel; 7 --- air tank; 8 --- pressure gauge.

4 a schematic diagram of the test apparatus of FIG fusible plug

8.3.2 fusible plug means resistance against extrusion test 8.3.2.1 nominal working pressure for less than or equal to the anti-fusible plug means on the extruded cylinder 3.45MPa test. the sample within the cylinder One end portion of the compressed air is applied to the medium in contact with a test pressure of 3.45 MPa, and kept at 60 deg.] C of not less than 24h, and then The other end of the inspection, no leakage no visible extrusion workability fluxing qualified. 8.3.2.2 nominal working pressure for not more than 3.45MPa greater than the fusible plug means 30MPa cylinder on the anti-extrusion test. Test One end of the sample medium in contact with the compressed air inside the cylinder is applied, the test pressure is not less than 70% of the test pressure of the hydraulic cylinder, and not low Conditions for 24h at 82 deg.] C, and then checks at the other end, no leakage no visible extrusion workability fluxing qualified. 8.3.2.3 Regulation for each nominal working pressure is greater than 3.45MPa fusible plug means and not greater than 30MPa over the cylinders, the new design Grid fusible plug means, before the product should be arbitrarily selected three representative samples, the following tests under conditions of not lower than 82 deg.] C. Sample should be between 2.1MPa and 70% of the cylinder hydrostatic test pressure does not exceed four times/min, the rate of fatigue tests, 26,000 times the sample should be no leakage fluxing no visible extrusion workability. The sample was then held at 70% 500h cylinder hydrostatic test pressure, no leakage after the test with no visible extrusion workability fluxing qualified. 8.3.3 fusible plug means operating temperature test 8.3.2 Qualified will predetermined test two samples screwed on the abutment end in contact with the medium inside the cylinder downward, and through the end Compressed air, which pressure is not less than 0.02MPa. At the same time, the sample was immersed in a glycerine bath, the temperature of the glycerin bath should be a predetermined maximum Low temperature operation within 3 ℃, for at least 10min at this pressure and temperature, should be no leakage. Glycerin bath temperature was then raised, the rate of temperature increase of not more than 0.6 ℃/min. In the meantime, the pressure can be increased to not more than 0.35MPa. When the sample fusible alloy extruded air leakage, note the operation temperature of the glycerin bath temperature at this time as a fusible plug means degree. Fusible alloy extruded should occur within 10min after the maximum allowable operating temperature has been reached and stabilized the test, the temperature deviation and Range should meet the requirements of 4.3. 8.3.4 Acceptance rules Two samples shall meet the requirements of 8.3.2 and 8.3.3, the batch is qualified. If there is a failure in two samples should be from the same Optionally further batch four samples tested, four samples as long as there is a requirements are not met, the batch scrapped. 8.4 fusible plug tightness testing device Fusible plug means to be individually tested for leakage, the test medium using air, said test pressure is a pressure corresponding to the working cylinders known 1.25, dwell time should not be less than the dwell time of the respective cylinders airtightness test, no leakage is acceptable.

9 logo

9.1 should the outer end face of the fusible plug means made out of a permanent marker, flag should be clear, strong and visible after installation. 9.2 mark The project includes. a) Nominal operating temperature; b) production lot; c) manufacturer code; d) year of manufacture. 9.3 Flag sequence Flag should be arranged along a circumferential line, each of the items by 9.2 in a), b), c), d) arranged clockwise. 10 batch quality certification Each batch fusible plug device should have quality certification, quality certification batch format see Appendix B. Other 11 11.1 per batch fusible alloy should take ventilation measures in preparation, casting and perfusion processes. 11.2 should be fusible plug means test to take security measures. 11.3 manufacturer's product information should be retained for at least five years.

Appendix A

(Informative) Fusible alloy formula Table A.1 Alloy weight percentage /% melt zone temperature/℃ Bi Pb Sn Cd starting point Endpoint weight pour point Remark 50.0 26.7 13.3 10.0 70 70 70 Eutectic 52.0 32.0 16.0 959 595 Eutectic 53.9 25.9 20.2 102.5 102.5 102.5 eutectic

Appendix B

(Informative) Fusible plug means bulk quality certification ××××××××× plant Factory Address Fusible plug means bulk quality certification Fusible plug means nominal operating temperature Fusible plug means actual operating temperature Material type jack plug In vitro thread type plugs Fusible alloy ingot or bar marks furnace No. This batch production batch were a fusible plug means Year of manufacture Factory Inspection Seal year month day ......

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